Research Article |
Corresponding author: Bruno F. Fiorillo ( ferreto_74@hotmail.com ) Academic editor: Robert Jadin
© 2021 Bruno F. Fiorillo, Jorge Henry Maciel, Marcio Martins.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Fiorillo BF, Maciel JH, Martins M (2021) Composition and natural history of a snake community from the southern Cerrado, southeastern Brazil. ZooKeys 1056: 95-147. https://doi.org/10.3897/zookeys.1056.63733
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The natural history of a cerrado snake community in a protected area in southeastern Brazil (Santa Bárbara Ecological Station; SBES) is described. A visual guide and an identification key are also provided to assist researchers and local people in identifying snakes in that region.
Sampling was performed through pitfall traps, time-constrained search, accidental encounters, and observations by local people for two years, which corresponded to 240 days of sampling. Among the 388 individuals found in the field, 33 snake species belonging to 21 genera of seven families were recorded. Most species were restricted or found at least once in non-forest vegetation types (campo sujo, campo cerrado, and cerrado sensu stricto) and a few were restricted to forest habitats (cerradão). Our results show that most species (1) occupy open areas; (2) present both diurnal and nocturnal activity; (3) are primarily terrestrial; (4) include lizards, mammals and/or anurans in the diet; (5) present seasonal reproductive activity; and (6) use mainly visually oriented defensive tactics. Despite its small size (3,154 ha), the SBES harbours preserved habitats and a rich and typical Cerrado snake fauna, including threatened species. Furthermore, most of the SBES snakes occur in non-forest environments (54%) and some species are sensitive to habitat disturbance.
Behaviour, diet, habitat, reproduction, savanna, Serpentes
The gathering of information related to natural history, what the organisms do in their respective environments, including the interactions between them (
Despite the high diversity of neotropical snakes (
Several protected areas in the southern portion of the Cerrado include a mosaic of typical vegetation types of the biome (from grasslands to woodlands), which has contributed to maintaining a high species diversity of amphibians and reptiles within their limits (
Herein we provide basic natural history information for a Cerrado snake community inhabiting a protected area, Santa Bárbara Ecological Station, in southeastern Brazil. The snake fauna of this area was previously studied by
This study was carried out at the Santa Bárbara Ecological Station (SBES), located in Águas de Santa Bárbara, State of São Paulo, Brazil (22°46' to 22°41'S and 49°16' to 49°10'W, elevation 600–680 m, Figure
Topographic map of the region where the Santa Bárbara Ecological Station is located. Only the main cities of the region are shown. The Cerrado limits in this region are indicated by dashed lines. The green areas are strict conservation protected areas (PAs). Note that there are just four PAs in the Cerrado of this region.
It is estimated that the SBES harbours 4–9.5% of the total plant species present in the Cerrado (
The samplings were performed periodically, for 10 days each month, from August 2016 to July 2018, for a total sample time of 240 days. Snakes were sampled with pitfall traps with drift fences (
Schematic representation of the sampling design used in this study at the Santa Bárbara Ecological Station A representation of the distribution of three sampling units of pitfall traps (the sampling design in each vegetation type); each sampling unit was composed of two straight lines of drift fence (each of them 40 m long, 60 cm high), each line with four 100-L buckets 10 m apart from each other B representation of the sampling units used in each vegetation type; the red sampling units were fire treatments of a study on the effects of fire on the herpetofauna, results of which will be published elsewhere.
Time-constrained searches (TCS; sensu
Accidental encounters (AE;
The sampling efficiency of each method (AE, OLP, PT, and TCS) was evaluated through rarefaction curves of individuals with 5,000 randomisations (
To describe the diet of each species, collected specimens (see below) were dissected through an incision in the ventral region. Food items were identified to the lowest possible taxonomic rank using taxonomic keys, identification guides, specimens deposited in scientific collections, and help from experts. Whenever the prey came from a snake captured in a PT, this information was included, given the possibility of the snake having ingested prey that had also fallen in the trap (
The capture location of all animals sampled by the methods described above was georeferenced. In addition, all captured individuals were weighed and measured (snout-vent length; SVL). The average SVL (mean SVL) of each species was calculated based on adult individuals, which in turn were classified according to the SVL of the smallest reproductive female (containing ovarian follicles) or information from the literature. When adult individuals were not found, data from the literature were presented. New-born individuals were thus classified according to the presence of an evident umbilical scar. All captured individuals were released at the site of capture, except for voucher specimens. Owing to the importance of collecting voucher specimens for taxonomic identification and analysis of gastrointestinal and reproductive tracts to obtain useful natural history data, specimens and tissue samples were collected and preserved and these will later be deposited in the herpetological collections of the Museu de Zoologia da Universidade de São Paulo (
Besides the detailed natural history accounts for each species, we also provide a photographic guide (Figures
With a sampling effort of 240 days of fieldwork, corresponding to 23,040 bucket-days and including 1248 person-hours of time-constrained search, we found 388 individuals (146 collected specimens; see Suppl. material
Among all 33 species encountered using all described methods, approximately half of the species (18 species, 54%) used more often or were found exclusively in open (i.e., non-forest) vegetation types (campo sujo, campo cerrado or cerrado sensu stricto), while only Boa constrictor, Bothrops moojeni, Erythrolamprus aesculapii, Erythrolamprus reginae, Phalotris mertensi, and Philodryas olfersi were found most frequently (> 80% of the records for these species) in forest vegetation types (cerradão or gallery forests). Four species (Apostolepis dimidiata, Crotalus durissus, Pseudoboa nigra, and Xenodon merremi) were considered habitat generalists (based also in the literature data), using both open and forest vegetation types (Table
Natural history summary of snakes found at Santa Bárbara Ecological Station, based on both data from this study and literature data. ACTIVITY = daily activity (D = diurnal; N = nocturnal); DIET (AN = anuran; AM = amphisbaenian; BE = bird eggs; BI = birds; FI = fish; IN = invertebrate; LI = lizard; LE = lizard eggs; MA = mammal; MO = mollusc; SN = snake); HABITAT = habitats used in the study area (CC = campo cerrado; CS = campo sujo; CD = cerradão; DA = disturbed area; GF = gallery forest; SS = cerrado sensu stricto; WF = wet field); MICRO-HABITAT (AQ = aquatic; AR = arboreal; CR = cryptozoic; FO = fossorial; TE = terrestrial). Uppercase letters represent the main resources and habits used according to the present study and the literature, while lowercase letters denote those used only occasionally (< 20% of the records in this study and/or rarely documented in the literature). Letters in parentheses indicate data obtained only from the literature and which were not observed in the present study, while an asterisk indicates that the observation is exclusive to the present study. Predominantly fossorial habits were inferred mainly from data in the literature and snake morphology (small eyes, flat skull, fused head scales and relatively short tail;
Taxon | Habitat | Micro-habitat | Activity | Diet |
---|---|---|---|---|
ANOMALEPIDIDAE | ||||
Liotyphlops ternetzii | CC | (FO) | (N, D) | (IN) |
LEPTOTYPHLOPIDAE | ||||
Trilepida koppesi | CC, cd, CS, SS | (FO), TE | N, (d) | IN |
BOIDAE | ||||
Boa constrictor | CD, DA, gf | (AR), TE | D, (N) | BI, (li), MA |
Epicrates crassus | CC, CS, CD | ar, TE | d, N | (BI), MA |
COLUBRIDAE | ||||
Chironius brazili | DA | (AR), TE | D | (AN) |
Chironius quadricarinatus | SS | (AR), TE | D | (AN) |
Tantilla melanocephala | CC, CS | (FO), TE | (D, N) | IN |
DIPSADIDAE | ||||
Apostolepis dimidiata | CC, CD, cs, ss | cr, (FO), TE | (N) | (AM), li*, (SN) |
Atractus pantostictus | CC, CS, GF | (CR), (FO), TE | (D), N | IN, (li) |
Dipsas mikanii | DA | TE | D, (N) | (MO) |
Erythrolamprus aesculapii | CD, da | CR, TE | D | SN |
Erythrolamprus almadensis | CS | (AQ), TE | (D) | (AN, FI) |
Erythrolamprus poecilogyrus | CC, CS, DA, SS | TE | D, N | (AN) |
Erythrolamprus reginae | CD | (AQ), TE | (D), (N) | AN, LI |
Oxyrhopus guibei | CC, CS, da, ss, wf | TE | N | ma, LI |
Oxyrhopus rhombifer | CS | TE | (N) | (MA, LI, sn) |
Phalotris lativittatus | da, CC, cd, SS | (FO), TE | N | AM, SN |
Phalotris mertensi | (CS), CD | (FO), te | D, (N) | (AM) |
Philodryas olfersi | CD | (AR), TE | D | AN, MA |
Philodryas patagoniensis | CS, (DA, SS) | TE | (D) | (AN, bi, LI, ma, sn) |
Pseudoboa nigra | CS, GF | TE | N | (am), LI, (ma, sn) |
Rhachidelus brazili | CS, CC, (da) | TE | N | (BE), bi |
Taeniophallus occipitalis | CS, CC, SS | (CR), TE | D, N | (AN), LI |
Thamnodynastes hypoconia | cs, WF | (AR), TE | N | (AN) |
Xenodon merremi | CD, DA | cr, TE | D | (AN) |
Xenodon nattereri | CS, CC | (FO), TE | (D) | (LI,sn), LE |
ELAPIDAE | ||||
Micrurus frontalis | CC | (FO), TE | (D, N) | (AM, LI, SN) |
Micrurus lemniscatus | CC | (FO), TE | (D, N) | (AM, FI, SN) |
VIPERIDAE | ||||
Bothrops alternatus | CS, cc, da | TE | D, N | MA |
Bothrops itapetiningae | CS, CC | TE | D, N | (an, bi, LI, MA) |
Bothrops moojeni | cc, cd, da, GF, ss | (ar), TE | d, N | AN, MA |
Bothrops pauloensis | CC, cd, cs, da | TE | d, N | an, (bi, LI, MA, sn) |
Crotalus durissus | DA, cc, CD, cs, gf, ss | TE | D, N | (li), MA |
Occurrence (number of snakes which presented a given gut content) and total number of prey items consumed by snakes from Santa Bárbara Ecological Station, SP, Brazil. Asterisks indicate individuals captured in pitfall traps.
Taxon | Gut contents | Occurrence | Number of prey items |
---|---|---|---|
Leptotyphlopidae | |||
Trilepida koppesi | Isoptera | 3* | 12* |
insect eggs | 1* | 9* | |
Formicidae pupae | 3* | 12* | |
Boidae | |||
Boa constrictor | feathers Didelphis albiventris | 1 | 1 |
1 | 1 | ||
Guira guira | 1 | 1 | |
Epicrates crassus | mammal | 1 | 1 |
Colubridae | |||
Tantilla melanocephala | Chilopoda | 1; 3* | 1; 3* |
Dipsadidae | |||
Apostolepis dimidiata | Teiidae skin fragments | 1* | 1* |
Atractus pantostictus | Oligochaeta | 1; 1* | 1; 1* |
Erythrolamprus aesculapii | snake scale | 1 | 1 |
Erythrolamprus reginae | lizard scale | 1* | 1* |
Physalaemus sp. | 1* | 1* | |
Oxyrhopus guibei | Aspronema dorsivittatum | 4* | 4* |
Teiidae scale | 1* | 1* | |
Gymnophtalmidae skin fragments | 1* | 1* | |
rodent | 1 | 1 | |
Phalotris lativittatus | Amphisbaenian fragments | 1 | 1 |
Trilepida koppesi scales | 1* | 1* | |
Philodryas olfersii | Oligoryzomys nigripes | 1 | 1 |
Scinax fuscovarius | 1 | 1 | |
Pseudoboa nigra | Ameiva sp. scales | 1 | 1 |
Rhachidelus brazili | bird bones and feathers | 1 | 1 |
Taeniophallus occipitalis | Teiidae fragments | 1; 1* | 1; 1* |
Xenodon nattereri | lizard eggs | 1 | 2 |
Viperidae | |||
Bothrops alternatus | Clyomys laticeps | 1 | 1 |
Bothrops moojeni | Leptodactylus sp. | 1 | 1 |
rodent | 1 | 1 | |
Bothrops pauloensis | Leptodactylus sp. | 1 | 1 |
Crotalus durissus | Calomys tener | 1 | 1 |
mammal | 5 | 5 |
As expected, the different lineages in the community showed some differences regarding their natural history. The snakes of the family Dipsadidae (most represented in the community) showed similar habits within tribes, where those belonging to the tribe Elapomorphini (A. dimidiata, P. lativittatus, and P. mertensi) used forests (although P. lativittatus uses primarily open areas), exhibit (at least in part) nocturnal activity (A. dimidiata and P. lativittatus are nocturnal species and although P. mertensi has been found thermoregulating during the day, this species probably is also primarily nocturnal) and consume elongated fossorial vertebrates (caecilians, amphisbaenians, and other snakes). Among the species of the tribe Pseudoboini (O. guibei, O. rhombifer, P. nigra, and R. brazili), except for P. nigra, all were found exclusively in open areas, active during the night and include primarily mammals and/or lizards in their diets (except for R. brazili, which is specialised in birds and their eggs). In the tribe Xenodontini, most species showed primarily daytime activity and preyed mostly on anurans, all of which are primarily terrestrial and/or cryptozoic.
The vipers of the genus Bothrops differed in terms of habitat use according to the respective clade within the genus (see Carrasco et al. 2011). The species of the B. alternatus group (B. itapetiningae and B. alternatus) strictly occupied the most open areas of the reserve (campo sujo and campo cerrado), the representative of the B. neuwiedi group (B. pauloensis) was also more frequent in open areas, although it was not as restricted to these habitats (it was found also in cerrado sensu stricto and in cerradão), whereas the representative of the B. atrox group (B. moojeni) was associated with forests (gallery forests) and wet fields. The rattlesnake, C. durissus, was found in all habitats.
We obtained 48 gut contents from 138 individuals (specimens dissected or live individuals that regurgitated or defecated prey remains; Table
Temporal distribution of the number of ovarian follicles (F) and new-borns (NB) of different species found at Santa Bárbara Ecological Station between August 2016 and July 2018. Numbers in parentheses represent the length of the largest ovarian follicle (mm) and asterisks indicate a secondary or vitellogenic ovarian follicle (> 5 mm).
Species | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
wet season | dry season | wet season | ||||||||||
Liotyphlops ternetzii | 1NB | |||||||||||
Trilepida koppesi | 19F(3.5) | 15-48F(21.6)* | ||||||||||
Chironius brazili | 21F(5.2)* | |||||||||||
Tantilla melanocephala | 8F(3.8) | 11F(6.5)* | ||||||||||
Apostolepis dimidiata | 6F(5) | 1NB | 1F(24)* | |||||||||
Atractus pantostictus | 7F(9.7)* | 37F(9)* | ||||||||||
Dipsas mikanii | 1NB | |||||||||||
Erythrolamprus aesculapii | 5F(7.6)* | |||||||||||
Erythrolamprus almadensis | 1NB | |||||||||||
Erythrolamprus reginae | 6F(16.5)* | |||||||||||
Oxyrhopus guibei | 7F(27.7)* | |||||||||||
Oxyrhopus rhombifer | 1NB | |||||||||||
Phalotris lativittatus | 1F(7.4)* | |||||||||||
Philodryas olfersii | 22F(11)* | |||||||||||
Taeniophallus occipitalis | 1NB | 1NB | 17F(8.7)* | |||||||||
Xenodon merremii | 26F(7.2)* | |||||||||||
Xenodon nattereri | 8F(3.8) | |||||||||||
Bothrops alternatus | 14F(13.7)* | |||||||||||
Bothrops itapetiningae | 7F(3.9) | |||||||||||
Bothrops moojeni | 1NB | 28F(5.2)* | ||||||||||
Bothrops pauloensis | 18F(4.5); 1NB | 1NB | 1NB | 11F(6)*; 15F(3.6) | ||||||||
Crotalus durissus | 1NB | 1NB | 8F(4.3) |
1 | Ventral and dorsal scales of the same size | Anomalepididae and Leptotyphlopidae |
– | Ventral and dorsal scales of distinct sizes | 2 |
2 | Loreal pit present | Viperidae |
– | Loreal pit absent | 3 |
3 | Proteroglyphous dentition | Elapidae |
– | Other dentition types | 4 |
4 | Aglyphous dentition; cephalic scutes small, undifferentiated; > 30 dorsal scale rows | Boidae |
– | Solenoglyphous dentition; cephalic scutes large, with different forms; fewer than 30 dorsal scale rows | Colubridae and Dipsadidae |
Species of the families Anomalepididae and Leptotyphlopidae
1 | Ocular scale in contact with mouth | Trilepida koppesi |
– | Ocular scale not in contact with mouth | Liotyphlops cf. ternetzii |
Species of the family Viperidae
1 | Presence of a rattle or a button at the tip of the tail; some large plates on the dorsum of the head | Crotalus durissus |
– | No rattle or button at the tip of the tail; no large plates on the dorsum of the head | 2 |
2 | Prelacunal scale fused with the second supralabial scale | Bothrops moojeni |
– | Prelacunal scale not fused with the second supralabial scale | 3 |
3 | Postocular stripe inserted in the inferior region of the ocular orbit | 4 |
– | Postocular stripe not inserted in the inferior region of the ocular orbit | Bothrops pauloensis |
4 | Colour pattern with trapezoidal dark marks; > 11 supralabial scales | Bothrops alternatus |
– | Colour pattern not as above; < 11 supralabial scales | Bothrops itapetiningae |
Species of the family Elapidae
1 | Parietals completely black | Micrurus frontalis |
– | Posterior portion of parietals red | Micrurus lemniscatus |
Species of the family Boidae
1 | Supralabials in contact with eye | Epicrates crassus |
– | Suprelabials not in contact with eye | Boa constrictor |
Species of the families Colubridae and Dipsadidae
1 | Even number of dorsal scale rows | 2 |
– | Odd number of dorsal scale rows | 3 |
2 | Anterior third of the body blackish, with a yellowish vertebral stripe | Chironius flavolineatus |
– | Anterior third of the body brown or light grey, without a vertebral stripe | Chironius quadricarinatus |
3 | 15 or fewer dorsal scale rows at midbody | 4 |
– | More than 15 dorsal scale rows at midbody | 11 |
4 | 13 dorsal scale rows at midbody | Philodryas agassizii |
– | 15 dorsal scale rows at midbody | 5 |
5 | A single prefrontal scale | 6 |
– | A pair of prefrontal scales | 7 |
6 | Presence of dark longitudinal stripes along the flanks; snout slightly pointed, with prominent rostral scute | Phalotris lativittatus |
– | No dark longitudinal stripes along the flanks; snout rounded, rostral scute not prominent | Phalotris mertensi |
7 | Internasal scutes absent | Apostolepis dimidiata |
– | Internasal scutes present | 8 |
8 | Coral colour pattern of alternating black, yellow/white, and red bands | Erythrolamprus aesculapii |
– | Colour pattern not as above | 9 |
9 | Black bands throughout the dorsum; dark oral and cloacal mucosae | Dipsas mikanii |
– | Colour pattern not as above; light oral and cloacal mucosae | 10 |
10 | Head brown to greyish, often with a pair of light ocelli on the parietal scutes; yellow venter; < 175 ventral scales | Taeniophallus gr. occipitalis |
– | Head black, without a pair of light ocelli on the parietal scutes; cream to whitish venter; > 175 ventral scales | Tantilla melanocephala |
11 | More than 19 dorsal scales at midbody | Rhachidelus brazili |
– | 19 or fewer dorsal scales at midbody | 12 |
12 | 17 dorsal scales at midbody | 13 |
– | 19 dorsal scales at midbody | 14 |
13 | Venter yellow with black marks; dorsal scales with reduction in number towards cloaca (17/17/15) | Erythrolamprus reginae |
– | Venter uniformly cream; dorsal scales without reduction in number (17/17/17) | Atractus pantostictus |
14 | Anal plate entire | 15 |
– | Anal plate divided | 17 |
15 | Dorsum and flanks black with or without white areas; juveniles with a white band on the dorsum of the head and a nuchal black and dorsum rose-red; subcaudals entire | Pseudoboa nigra |
– | Coral colour pattern (alternated black, yellow/white, and red bands); subcaudals divided | 16 |
16 | Coral colour pattern in trios | Oxyrhopus guibei |
– | Coral colour pattern not in trios | Oxyrhopus rhombifer |
17 | Dorsal scale rows in 19/19/15 | 18 |
– | Dorsal scale rows in 19/19/17 | 21 |
18 | Keeled dorsal scales | Thamnodynastes hypoconia |
– | Smooth dorsal scales | 19 |
19 | Green dorsum, brown head and vertebral stripe | Philodryas olfersii |
– | Colour pattern not as above | 20 |
20 | 7 supralabials, third and fourth in contact with the ocular orbit | Philodryas patagoniensis |
– | 8 supralabials, fourth and fifth in contact with the ocular orbit | Erythrolamprus poecilogyrus |
21 | Snout pointed, with rostral scute upturned and keeled | Xenodon nattereri |
– | Snout round, without rostral scute upturned and keeled | 22 |
22 | Venter orange-red from the 2/3 of the body onward; 8 supralabials, fourth and fifth in contact with the ocular orbit | Erythrolamprus almadensis |
– | Venter cream; 7 supralabials, third and fourth in contact with the ocular orbit | Xenodon merremii |
Liotyphlops ternetzii (Boulenger, 1896)
Figure
It is a small aglyphous species (mean SVL = 239 mm; range 93–319 mm; N = 30;
Trilepida koppesi (Amaral, 1955)
Figure
It is a small aglyphous species (mean SVL = 245 mm; range 198–323 mm; mature males, SVL ≥ 198 mm, and mature females, SVL ≥ 225 mm; N = 83). This species was found more frequently in open areas, such as campo sujo (N = 51) and campo cerrado (N = 62), but also in cerrado sensu stricto (N = 21) and in cerradão (N = 1). Almost all observations through TCS (only one through AE) of active individuals (moving) were made at night, between 07:00 and 09:00 PM (N = 14). Among eight individuals examined, four had stomach contents, three ingested termites (MRCM 290, 355, 383) and pupae of ants (MRCM 290, 328, 383) and one, insect eggs (MRCM 290). It is known to be fossorial and both diurnal and nocturnal (
Defensive tactics of snakes from the Santa Bárbara Ecological Station, SP, Brazil. BI = bite; CB = compress body while raising head; CD = cloacal discharge; DF death feigning; EM = perform erratic movements; FB = flatten body; FBL = flatten body laterally; HH = hide head; OM = open mouth; PT = press the sharp tip of the tail against the captor’s hand; ST = strike; TB = twist the body; TD = tail display; TH = triangulate head; SC = S-coil; VT = vibrate tail. The numbers indicate field observations, and an “X” indicates data from the literature (
Species | BI | CB | CD | DF | EM | FB | FBL | HH | OM | PT | ST | TB | TD | TH | SC | VT |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Liotyphlops ternetzii | X | |||||||||||||||
Trilepida koppesi | 1 | 27 | 11 | X | ||||||||||||
Boa constrictor | 2 | 1 | 1 | |||||||||||||
Epicrates crassus | X | X | X | X | ||||||||||||
Chironius brazili | 1 | 1 | 1 | |||||||||||||
Chironius quadricarinatus | 1 | X | X | 1 | 1 | |||||||||||
Tantilla melanocephalla | X | X | ||||||||||||||
Apostolepis dimidiata | X | 1 | ||||||||||||||
Atractus pantostictus | X | X | 1 | |||||||||||||
Dipsas mikanii | X | X | 1 | X | 1 | |||||||||||
Erythrolamprus aesculapii | 2 | X | 1 | 1 | 3 | X | 3 | |||||||||
Erythrolamprus almadensis | X | |||||||||||||||
Erythrolamprus poecilogyrus | 1 | X | X | |||||||||||||
Erythrolamprus reginae | 2 | 1 | 2 | |||||||||||||
Oxyrhopus guibei | 1 | 3 | X | X | 1 | |||||||||||
Oxyrhopus rhombifer | X | X | X | X | X | |||||||||||
Phalotris lativittatus | X | X | ||||||||||||||
Phalotris mertensi | 1 | X | X | |||||||||||||
Philodryas olfersii | X | X | X | X | ||||||||||||
Philodryas patagoniensis | X | X | X | X | X | |||||||||||
Pseudoboa nigra | 1 | X | 1 | |||||||||||||
Rhachidelus brazili | 1 | 1 | 1 | 1 | ||||||||||||
Taeniophallus occipitalis | X | X | X | 1 | ||||||||||||
Thamnodynastes hypoconia | 2 | X | X | X | X | X | X | |||||||||
Xenodon merremii | 1 | 2 | 1 | 1 | 2 | X | 1 | |||||||||
Xenodon nattereri | X | X | X | |||||||||||||
Micrurus frontalis | 1 | X | 1 | 1 | ||||||||||||
Micrurus lemniscatus | 1 | X | 1 | 1 | 1 | |||||||||||
Bothrops alternatus | 2 | 2 | 3 | 2 | ||||||||||||
Bothrops itapetiningae | X | 1 | X | X | 1 | 2 | ||||||||||
Bothrops moojeni | 1 | X | X | 1 | X | 3 | 4 | |||||||||
Bothrops pauloensis | 1 | 1 | 16 | 1 | 12 | |||||||||||
Crotalus durissus | 2 | X | 5 | 6 |
Boa constrictor Linnaeus, 1758
Figure
It is a large aglyphous species (mean SVL = 1,122 mm; range 935–1,332 mm; N = 6; this study). Four individuals were found on the edge of forests or in forest areas (two occasionally on the edge of cerradão, one OLP on the edge of gallery forests, and the other OLP on a Eucalyptus plantation with surrounding forest) and five were captured in a disturbed area close to the SBES headquarters, also OLP. All individuals were moving on the ground during the day (between 07:00 AM and 04:00 PM). The available information indicates that the species is semi-arboreal and both diurnal and nocturnal (
Epicrates crassus Cope, 1862
Figure
It is a large aglyphous species (mean SVL = 893 mm; range 704–1000.5 mm; N = 4; this study). One individual was found in the campo sujo (AE), three in the campo cerrado (AE = 2, TCS = 1; MRCM 395) and one in the edge of a forest (TCS; MRCM 359). Three of them were moving during the night and one during the day. An individual was found perched on the drift fence of one of the PTs (MRCM 395). One of the specimens examined contained hair in its stomach (MRCM 359). The available information indicates that the species is both diurnal and nocturnal, has terrestrial habits, and feeds mainly on birds and mammals (
Chironius brazili Hamdan & Fernandes, 2015
Figure
It is a large aglyphous species (mean SVL = 893 mm; range 256–995 mm; N = 37;
Chironius quadricarinatus (Boie, 1827)
Figure
Large aglyphous species (mean SVL = 633; range 504–808 mm; N = 108;
Tantilla melanocephala (Linnaeus, 1758)
Figure
It is a small opisthoglyphous species (range 181–296 mm; N = 146;
Apostolepis dimidiata (Jan, 1862)
Figure
It is a medium-sized opisthoglyphous species (mean SVL = 387.8 mm; range 196–634 mm; N = 46;
Atractus pantostictus Fernandes & Puorto, 1993
Figure
It is a small aglyphous species (mean SVL = 269 mm; range 122–420 mm; N = 10;
Dipsas mikanii Schlegel, 1837
Figure
It is a medium-sized aglyphous species (mean SVL = 270 mm; range 122–465 mm; N = 36;
Erythrolamprus aesculapii (Linnaeus, 1758)
Figure
It is a medium-sized opisthoglyphous species (mean SVL = 598 mm; range 580–615 mm; N = 3; this study). Most individuals (AE = 1, OLP = 1) were observed close to forest areas (MRCM 361 and a specimen not collected in cerradão and MRCM 252 in a transition area between a pine forest and cerradão); the fourth individual (MRCM 424) was captured (OLP) in a disturbed area near the SBES headquarters. Two individuals were observed moving during the day (between 09:00 AM and 09:30 AM; MRCM 252 and MRCM 361). The available information indicates that the species is terrestrial, cryptozoic, and diurnal (
Erythrolamprus almadensis (Wagler, 1824)
Figure
It is a small aglyphous species (it can reach just longer than 500 mm SVL;
Erythrolamprus poecilogyrus (Wied-Neuwied, 1825)
Figure
It is a small aglyphous species (mean SVL = 359 mm; range 275–429 mm; N = 3; this study). Three individuals were observed in open areas (campo cerrado, cerrado sensu stricto, and one in a disturbed area at the SBES headquarters; MRCM 369, 1277, and 241, respectively). One (MRCM 241) was accidentally found moving during the day (04:00 PM) and another (MRCM 369) during TCS at night (08:05 PM). The other was captured though AE. The available information indicates that the species is terrestrial and both diurnal and nocturnal (this study;
Erythrolamprus reginae (Linnaeus, 1758)
Figure
It is a medium-sized aglyphous species (mean SVL = 417 mm; range 190–597 mm; N = 19;
Oxyrhopus guibei Hoge & Romano, 1978
Figure
It is a medium-sized opisthoglyphous species (mean SVL = 551 mm; range 415–835 mm; N = 4; this study). The individuals were found in campo cerrado (AE = 4, PT = 3, TCS = 1; MRCM 326, 431, 1388), campo sujo (PT = 4; MRCM 325, 466, 1000, 1183), cerrado sensu stricto (PT = 2; MRCM 344, 1276), in a wet field near a campo cerrado area (AE = 1; MRCM 1216) and in disturbed areas, close to an area of cerradão (OLP = 1; MRCM 217). Three individuals were moving on the ground at night (between 07:00 PM and 08:00 PM; MRCM 326, 1216, and other individual). The available information indicates that it is terrestrial and nocturnal (
Oxyrhopus rhombifer Duméril, Bibron & Duméril, 1854
Figure
It is a medium-sized opisthoglyphous species (mean SVL = 447 mm;
Phalotris lativittatus Ferrarezzi, 1993
Figure
A medium-sized opisthoglyphous species (mean SVL = 758 mm; range 518–1,222 mm; N = 3; this study) found in campo cerrado (AE = 1, PT = 6; MRCM 317, 315, 406, 518, 535), cerrado sensu stricto (PT = 3; MRCM 322, 316, 1222), edge of cerradão (TCS = 1; MRCM 370), and in a disturbed area near to the SBES headquarters (OLP = 1; MRCM 200). One of the individuals was observed moving at night (MRCM 370). The available information indicates that it is fossorial and nocturnal (
Phalotris mertensi (Hoge, 1955)
Figure
It is a large opisthoglyphous species (mean SVL = 802 mm; range 304–1262 mm; N = 50;
Philodryas olfersii (Lichtenstein, 1823)
Figure
It is a large, opisthoglyphous species (mean SVL = 699 mm; range 285–1120 mm; N = 129;
Philodryas patagoniensis (Girard, 1858)
Figure
A large, opisthoglyphous species (mean SVL = 696 mm; range 205–1120 mm; N = 140;
Pseudoboa nigra (Duméril, Bibron & Duméril, 1854)
Figure
It is a large opisthoglyphous species (range 548–1261 mm; N = 110;
Rhachidelus brazili Boulenger, 1908
Figure
It is a large, opisthoglyphous species (mean SVL = 786 mm; range 435–1200 mm; N = 6;
Taeniophallus occipitalis (Jan, 1863)
Figures
A small aglyphous species (mean SVL = 269 mm; range 140–399 mm; N = 27;
Thamnodynastes hypoconia (Cope, 1860)
Figure
It is a small, opisthoglyphous species (mean SVL = 387 mm; range 364–417 mm; N = 5; this study). One individual was found near the campo sujo and the others in open flooded areas, always on the ground or in humid undergrowth, usually near water bodies with calling anurans. All individuals were moving at night and captured through TCS (between 06:30 and 9:20 PM). The available information indicates that the species is semi-arboreal and nocturnal (
Xenodon merremii (Wagler, 1824)
Figure
It is a large aglyphous species (mean SVL = 868 mm; range 845–903 mm; N = 3; this study). One individual (MRCM 319) was AE, while moving over the leaf litter in the cerradão during the day (11:15 AM), the others (MRCM 423, 495) were OLP in disturbed areas near the SBES headquarters. The available information indicates that it is terrestrial and diurnal (Vitt 1983;
Xenodon nattereri (Steindachner, 1867)
Figure
It is a small aglyphous species (mean SVL = 272 mm; range 135–442 mm; N = 73;
Micrurus frontalis (Duméril, Bibron & Duméril, 1854)
Figure
It is a large proteroglyphous species (mean SVL highly variable according to the subspecies; range 500–1,425 mm;
Micrurus lemniscatus (Linnaeus, 1758)
Figure
It is a large proteroglyphous species (range 500–900 mm;
Bothrops alternatus Duméril, Bibron & Duméril, 1854
Figure
It is a large solenoglyphous species (mean SVL = 997 mm; range 930–1,070 mm; N = 4; this study), reaching 1,240 mm of CRC (
Bothrops itapetiningae (Boulenger, 1907)
Figure
It is a small solenoglyphous species (mean SVL = 396 mm; range 185–570 mm; N = 89;
Bothrops moojeni Hoge, 1966
Figure
It is a large solenoglyphous species (mean SVL = 880 mm; range 680–1,150 mm; N = 11; this study). It was generally found associated with flooded open areas and gallery forests (AE = 5, TCS = 9; MRCM 215, 338); it was also found in campo cerrado (TCS = 1; MRCM 293), cerrado sensu stricto (PT = 1) and cerradão (TCS = 1). Three individuals were found in disturbed areas (OLP = 2; MRCM 240). All individuals found in this study were active, moving, eating or in an ambush posture (tight coil and head raised at 45°), at night (between 07:30 and 11:00 PM), except for a single adult individual, OLP, moving during daytime (10:00 AM) (see also
Bothrops pauloensis Amaral, 1925
Figure
It is a medium-sized solenoglyphous species (mean SVL = 611 mm; range 504–782 mm; N = 17; this study). Most individuals were found in open areas of campo sujo (AE = 6, TCS= 3; IBSP-90.262/sb0515) and campo cerrado (AE = 17, OLP = 1, PT = 1, TCS = 16; MRCM 256, 356, 425, 432, IBSP-90.262/sb0514), four in cerrado sensu stricto (AE = 2, TCS = 2; MRCM 1226), and only one (TCS) in the cerradão. Three individuals were found in disturbed areas (AE = 1, OLP = 2; MRCM 484) and four were observed OLP, without data on location or habitat (see also
Crotalus durissus (Linnaeus, 1758)
Figure
It is a large solenoglyphous species (mean SVL = 900 mm; range 825–988 mm; N= 12; this study). The individuals were observed in all vegetation types: campo sujo (AE = 3; MRCM 421, 1218), campo cerrado (AE = 2, TCS = 2) cerrado sensu stricto (AE = 3, OLP = 2), cerradão (AE = 10, OLP = 1, TCS = 1), in a transitional area between campo sujo and campo cerrado (AE = 1, TCS = 2) in a wet field (TCS = 1), on the edge of the gallery forest (AE = 1), and in disturbed areas (near farms outside the SBES, in disturbed areas at the SBES headquarters, and in pine forests; AE = 3, OLP = 4, TCS = 1; MRCM 289, 354, 392, 421, 485, 1273) (see also
This study has added 14 species to the previous list of snakes found at SBES (Araújo et al. 2010): A. dimidiata, B. alternatus, B. itapetiningae, C. brazili, C. quadricarinatus, E. aesculapii, E. crassus, L. ternetzii, M. lemniscatus, P. lativittatus, P. olfersi, P. nigra, R. brazili, and X. merremi. On the other hand, we failed to find two species listed by Araújo et al. (2010), Philodryas agassizii captured in the SBES during their study, and Philodryas livida, which is known only from a historical record (Instituto Butantan collection number IBSP 40953) with unclear locality data that was attributed to the Municipality of Águas de Santa Bárbara by the authors. However, there are three specimens of P. livida collected in the 1970s in the records of the Instituto Butantan collection, collected from the Municipality of Lençois Paulista, the centre of which is located only 44 km from the SBES. Thus, this species may have occurred at SBES in the past (see discussion on conservation below). As for P. agassizii, it must have gone unnoticed in our study, despite the large sampling effort. Thus, considering this study and that of Araújo et al. (2010), 35 species of snakes occur in the SBES.
Approximately half of the species of snakes found at the SBES used non-forest vegetation types almost exclusively (campo sujo, campo cerrado, and/or cerrado sensu stricto). Other studies already showed a trend of decrease in snake species richness with increasing vegetation complexity in the Cerrado (
The low proportion of species that use the arboreal strata (21%) in contrast to studies carried out in forests (e.g.,
The patterns of resources use described here for the snake community of SBES reflect mostly the composition of the community regarding snake lineages (
The most consumed prey items in the community (number of species which consumed a given prey type), based on the present study and the literature, were lizards followed by anurans and mammals. During our sampling, > 7,800 vertebrates were captured in pitfall traps, of which 64% were anurans, 16% were lizards, and 16% were small mammals. However, because of the highly seasonal rainfall in the Cerrado, frog activity is highly seasonal, with capture rates in pitfall traps increasing by orders of magnitude during the rainy season compared to the dry season (
Most reproductive females (ovarian follicles > 5 mm) were found from late dry season to late wet season. This peak of activity during the wet season in seasonal environments has also been recorded for other Neotropical snake communities (
Most of the defensive tactics observed in this study were supposedly directed at visually oriented predators (80% of tactics), such as birds (especially birds of prey), probably the most important predators of Neotropical snakes, and mammals (
The SBES snake fauna includes habitat specialists, sensitive to environmental disturbance, which are under different degrees of threat in the state of São Paulo. Four of these species are listed as threatened (Vulnerable, VU, or Endangered, EN) in the state of São Paulo red list (Governo do Estado de São Paulo 2018), B. itapetiningae (EN) O. rhombifer (VU), P. agassizii (EN) and X. nattereri (EN). Two species are listed as Near Threatened (NT) in the Brazilian red list (ICMBio 2018), Phalotris lativittatus and B. itapetiningae, whereas the former is listed as NT also in the IUCN red list (IUCN 2020). Additionally, P. livida, a species listed as VU in the three red lists cited above, is suspected to have occurred in the region of the SBES in the past (Araújo et al. 2010; see above). All these species are specialised in the open vegetation types of the Cerrado (especially the campos), are not able to persist in disturbed habitats (
The Cerrado is the Neotropical Ecoregion with the greatest snake species richness (N = 222), with an average of 30 to 60 species every 12,000 km2 (1° × 1°) (
Fieldwork was conducted with the help of Ana Luísa M. R. dos Santos, Ana Paula Carmignoto, Gabriel Sampaio, Gabriel Sonoda, Carolina Farhat, Carlos Abrahão, Claudio Marino, Filipe C. Serrano, Gabriella Leal, Giovana Felício, Jairo Roldan, João Paulo S. V. de Alencar, John U. Rosas, Juan C. Diaz-Ricaurte, Marcos Pestana, Nathany Biela, Paula Rocha, Rafael C. Menegucci, Rafaela Pereira, Ricardo Santa Maria, Solimary García-Hernandez, Vinícius Gabriel, and Paula Rocha. The authors thank Leandro R. Tambosi for performing the classification of land use types illustrated in Fig.
Specimens examined; field number acronyms mean Marcio Roberto Costa Martins (the senior author’s full name). All these specimens will be deposited in the herpetological collections of the Museu de Zoologia da Universidade de São Paulo (
Apostolepis dimidiata (10) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 1256, 1702, 1802, 387, 463, 483, 512, 524, 541, 545.
Atractus pantostictus (4) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 11, 100, 389, 427.
Boa constrictor (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 386.
Bothrops itapetiningae (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 366.
Bothrops alternatus (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 497.
Bothrops moojeni (4) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 215, 240, 293, 338.
Bothrops pauloensis (11) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, IBSP-90.262/sb0514–515, MRCM 248, 256, 356, 425, 432, 484, 507, 1024, 1226.
Chironius brazili (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 482.
Chironius quadricarinatus (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 1275.
Crotalus durissus (10) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 289, 354, 392, 421, 485, 505, 1107, 1218, 1273, 1806.
Dipsas mikanii (2) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 475, 1288.
Epicrates crassus (2) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 359, 395.
Erythrolamprus aesculapii (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 252, 361, 424.
Erythrolamprus almadensis (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 1289.
Erythrolamprus poecilogyrus (3) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 241, 369, 1277.
Erythrolamprus reginae (4) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 368, 434, 508, 1265.
Liotyphlops ternezii (2) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 433, 458.
Micrurus frontalis (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 489.
Micrurus lemniscatus (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 1700.
Oxyrhopus guibei (12) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 217, 249, 325, 326, 344, 431, 466, 1000, 1183, 1216, 1276, 1388.
Oxyrhopus rhombifer (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, not labeled.
Phalotris lativittatus (10) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 200, 315, 316, 317, 322, 370, 406, 518, 535, 1222.
Phalotris mertensi (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 1296.
Philodryas olfersii (2) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 1255, 1304.
Philodryas patagoniensis (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 1287.
Pseudoboa nigra (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 342.
Rachidelus brazili (1) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, IBSP 89664.
Taeniophallus occipitalis (7) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 435, 510, 523, 532, 1281, 1294, 1387.
Tantilla melanocephala (7) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 274, 291, 345, 461, 514, 544, 1298.
Thamnodynastes hypoconia (4) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 221, 222, 339, 534.
Trilepida koppesi (24) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 290, 292, 294, 307–314, 318, 321, 323, 327, 328, 340, 355, 381–383, 457, 546, 1375.
Xenodon merremii (3) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 319, 423, 495.
Xenodon nattereri (2) – Brazil: ÁGUAS DE SANTA BÁRBARA: Estação Ecológica de Santa Bárbara, MRCM 517, 1749.
Sampling efficiency evaluation
Data type: Analyses
Explanation note: Figure S1. Rarefaction curve representing the snake species richness observed (A) and the richness estimated by the Jackknife-1 estimator (B) for all methods together, and for each method used, accidental encounters (C), observations by local people (D), pitfall traps (E), and time constrained search (F) at the Santa Bárbara Ecological Station, state of São Paulo, Brazil. Table S1. Snake species richness (SR), number of individuals (Ind.), number of exclusive species, estimated richness of first order Jackknife, Shannon diversity index and dominance of each method used. Table S2. Number of snake individuals obtained by sampling method at the Santa Bárbara Ecological Station, SP, between August 2016 and July 2018.