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Corresponding author: Yves Alarie ( yalarie@laurentian.ca ) Academic editor: Mariano Michat
© 2019 Yves Alarie.
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:
Alarie Y (2019) The Hydradephaga (Coleoptera, Haliplidae, Gyrinidae, and Dytiscidae) fauna of Cape Breton Island, Nova Scotia, Canada: new records, distributions, and faunal composition. ZooKeys 897: 49-66. https://doi.org/10.3897/zookeys.897.46344
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The Haliplidae, Gyrinidae, and Dytiscidae (Coleoptera) of Cape Breton Island, Nova Scotia, Canada were surveyed during the years 2006–2007. A total of 2027 individuals from 85 species was collected from 94 different localities, which brings to 87 the number of species recorded for this locality. Among these, Heterosternuta allegheniana (Matta & Wolfe), H. wickhami (Zaitzev), Hydroporus appalachius Sherman, H. gossei Larson & Roughley, H. nigellus Mannerheim, H. puberulus LeConte, Ilybius picipes (Kirby), and I. wasastjernae (C.R. Sahlberg) are reported for the first time in Nova Scotia. The Nearctic component of the fauna is made up of 71 species (81.6%), the Holarctic component of 16 species (18.4%). Most species are characteristic of both the Boreal and Atlantic Maritime Ecozones and have a transcontinental distribution but 19 species (21.8%), which are generally recognized as species with eastern affinities. In an examination of the Hydradephaga of insular portions of Atlantic Canada, it was shown that the island faunas of Cape Breton Island and Prince Edward Island are very similar (87 and 84 species, respectively) despite differences in composition suggesting that more Hydradephaga species have yet to be found on Cape Breton Island.
biodiversity, faunistic, Hydradephaga, Maritime Ecozone
Cape Breton Island is a large (10,311 km2) rugged and irregularly shaped island, approximately 175 km long by 135 km at is widest, located at 46 degrees latitude, 60 degrees longitude in northern Nova Scotia, Canada at the eastern extremity of the Gulf of St. Lawrence. It lies within the Atlantic Maritime Ecozone along with Québec’s Gaspé Peninsula, Magdalen Islands Archipelago and portions of the south shore of the St. Lawrence River. The climate of this ecozone is strongly influenced by the Atlantic Ocean, which produces cooler summers (average 14 °C) and warmer winters (average -5 °C), with coastal areas having slightly warmer winters and cooler summers than inland. Geologically, this region is a mix of sedimentary and igneous bedrock (
Water beetles make up a large part of aquatic invertebrates (
Investigations of the Hydradephaga (Dytiscidae, Haliplidae, Gyrinidae) of the Canadian Maritimes have been sporadic and regionally variable. Recent papers (
Little is known about the Hydradephaga fauna of Cape Breton Island. Prior to this study, 51 species were reported as valid records in the faunal list for Cape Breton Island (
All of Nova Scotia mainland and Cape Breton Island sit within the Acadian Forest region as described by
Although physically separated from the Nova Scotia peninsula by the Strait of Canso, Cape Breton is artificially connected to mainland Nova Scotia by the Canso Causeway. The island is located east-northeast of the mainland with its northern and western coasts fronting on the Gulf of Saint Lawrence; its western coast also forming the eastern limits of the Northumberland Strait. The eastern and southern coasts front the Atlantic Ocean; its eastern coast also forming the western limits of the Cabot Strait. Cape Breton Island is composed mainly of rocky shores, rolling farmland, glacial valleys, barren headlands, mountains, woods and plateaus. The boreal highlands of Cape Breton reach elevations of 300–500 m and represent true boreal forest habitat, which is rare in Nova Scotia (
Cape Breton Island’s hydrological features include the Bras d’Or Lake system, a salt-water fjord at the heart of the island, and freshwater features including Lake Ainslie, the Margaree River system, and the Mira River. Innumerable smaller rivers and streams drain into the Bras d’Or Lake estuary and onto the Gulf of St. Lawrence and Atlantic coasts (www.newworldencyclopedia.org/entry/Cape_Breton_Island).
Geographically, Cape Breton Island is subdivided into four counties: Cape Breton, Inverness, Richmond, and Victoria. More than 70% of the total Cape Breton population live in the industrialized Cape Breton County. The boreal highlands of Cape Breton are located in the northern parts of Victoria and Cape Breton Counties. The climate of this region is influenced by the higher elevations, strong ocean winds and heavy blankets of dense fog that occur during spring and summer. The headwater streams of the highland regions flow over a primarily ancient metamorphic and granitic dominated geologic landscape, originating from cool springs or draining acidic, sphagnum bogs (
Collections were conducted over three periods, 05–10 May 2006, 17–22 August 2006, and 14–19 May 2007. Sampling was unstructured and qualitative with the goal of obtaining a strict inventory of Hydradephaga of Cape Breton Island. Beetles were collected using D-net sweeps in a variety of microhabitats including macrophyte beds, rocky shores, organic-rich sediments, and open water. Overall 94 samples were obtained, which are listed in Table
Cape Breton Island, Nova Scotia (Canada) sampling localities and habitats (2006–2007): letter in sample code refers to the county. Key: C = Cape Breton; I = Inverness; R = Richmond; V = Victoria.
Sample | Locality | Habitat |
---|---|---|
C01 | Cape Breton Co., Leitches creek Road, 1 km off Hwy 223. 14.v.2007 | Bog lake with Carex and Ericaceae along margin |
C02 | Cape Breton Co., Quarry Road, off Leitches creek Road, ca. 6 km off Hwy 223. 14.v.2007 | Shallow creek in spruce forest; bed with big boulders; swift current; littoral zone with alder, beech, yellow birch |
V03 | Victoria Co., Mackillop Road off Hwy 105 at exit to Cabot trail. 15.v.2007 | Bog pool on Sphagnum bed in white spruce forest; dark water; Carex along littoral zone |
V04 | Victoria Co., St. Ann’s Provincial Park, Mackillop Road off Hwy 105. 15.v.2007 | Pothole along shore of stream; mats of Graminea and Scirpus |
V05 | Victoria Co., Meadow Road, 4 km off Cabot trail N. 15.v.2007 | Shallow creek with swift current, ca. 3–4 m wide; cold water |
V06 | Victoria Co., Meadow Road, 5 km off Cabot trail N. 15.v.2007 | Shallow creek |
V07 | Victoria Co., Oregon Road, 2 km off Cabot trail N. 15.v.2007 | Pond covered with dead Scirpus |
V08 | Victoria Co., Cabot trail N., near junction to Meadow Road. 16.v.2007 | Shallow creek on rocky bed, with Sphagnum and bryophytes; spruce forest with Fagus; cold water (6 C) |
V09 | Victoria Co., West Tarbot Road ca. 1 km off Cabot trail N. 16.v.2007 | Ephemeral pot holes on clay bed, in Scirpus and Graminea field; shallow with algae; white spruce forest |
V10 | Victoria Co., West Tarbot Road ca. 1km off Cabot trail N. 16.v.2007 | Ephemeral roadside ditch; very eutrophic, with heavy accumulation of Sphagnum, black sediments; dark water |
V11 | Victoria Co., West Tarbot Road ca. 6 km off Cabot trail N. 16.v.2007 | Roadside ditch, slowly moving water; very shallow potholes (ca. 6 cm) with emerging vegetation |
V12 | Victoria Co., Cabot trail N., near junction Tarbot Vale Road and Rear Barachois Road. 16.v.2007 | Large pools formed by the river; clear water; rocky bed covered with organic matters (dead wood, dead leaves) in white spruce forest |
V13 | Victoria Co., Cabot trail N., 4 km south of Little River. 16.v.2007 | Man-made pond with mats of Scirpus |
V14 | Victoria Co., Cabot trail N., 4 km S. Little River. 16.v.2007 | Fen with Graminea |
V15 | Victoria Co., Rear Little River Road, off Cabot trail N. 16.v.2007 | Brook flowing over rocky bed, ca. 2 m wide; moderately moving water |
C16 | Cape Breton Co., Morrisson Road, ca. 6 km off Hwy 22 S. 18.v.2007 | Sphagnum bog in white spruce forest; with Ericacea, Scirpus and Typha |
C17 | Cape Breton Co., Morrisson Road, ca. 7 km off Hwy 22 S. 18.v.2007 | Sphagnum pool with Ericacea and Scirpus in white spruce forest |
C18 | Cape Breton Co., Morrisson Road, ca. 8 km off Hwy 22 S. 18.v.2007 | Shallow roadside ditch with Graminea and Sphagnum |
C19 | Cape Breton Co., Broughton Road near junction to Morrisson Rd. 18.v.2007 | Shallow eutrophic brook flowing over rocky bed |
C20 | Cape Breton Co., Broughton Road, 2 km off junction to Morrisson Rd. 18.v.2007 | Eutrophic lake |
C21 | Cape Breton Co., Broughton Road, 3 km off junction to Morrisson Rd. 18.v.2007 | Sphagnum bog |
C22 | Cape Breton Co., Broughton Road, 4 km off junction to Morrisson Rd. 18.v.2007 | Road-side ditch |
C23 | Cape Breton Co., South Head, Sailor Dans Lane. 18.v.2007 | Brook with heavy accumulation of bryophytes |
C24 | Cape Breton Co., South Head, Sailor Dans Lane. 18.v.2007 | Cattail pond with bryophytes and Carex |
C25 | Victoria Co., West Side Baddek Road, junction Hunter Mtn Road. 19.v.2007 | Small eutrophic creek; heavy accumulation of organic debris; margin with dense vegetation including dead Graminea |
V26 | Victoria Co., West Side Baddek Road, junction Hunter Mtn Rd. 19.v.2007 | Fen with dark brown water; heavy accumulation of Graminea |
V27 | Victoria Co., Baddek Forks. 19.v.2007 | Ephemeral woodland pool with Scirpus; bed with heavy accumulation of dead leaves |
V28 | Victoria Co., Baddeck River at Baddek Forks. 19.v.2007 | Pools beside river; very eutrophic |
R29 | Richmond Co., Road off Hwy 104E at exit 44 to Port Malcom. 05.v.2006 | Roadside bog with Sphagnum and Typha; in Picea and Larix laricina forest |
R30 | Richmond Co., Road off Hwy 104E near Port Hawskberry. 05.v.2006 | Roadside ditch on rocky bed covered with mud; shore with Typha and Alnus |
R31 | Richmond Co., Road off Hwy 104E towards Isle Madame. 05.v.2006 | Shallow creek on rocky bed, with mats of algae; shoreline with Carex and Graminea |
R32 | Richmond Co., Road off Hwy 104E towards Isle Madame. 05.v.2006 | Large creek flowing over rocky bed, presence of algae; in Picea and Betula allegheniensis forest; shoreline covered with dense bryophytes |
R33 | Richmond Co., Road off Hwy 104E towards Isle Madame. 05.v.2006 | Pond with heavy accumulation of organic debris |
R34 | Richmond Co., Isle Madame, Lake road off Hwy 206. 06.v.2006 | Man-made pond; rocky bed |
R35 | Richmond Co., Isle Madame, Lake road off Hwy 206. 06.v.2006 | Lake on sandy bed |
R36 | Richmond Co., Isle Madame, Hwy 206 at Anthony road. 06.v.2006 | Shallow puddle on muddy bed, in Graminea field |
R37 | Richmond Co., Isle Madame, Hwy 320 West at bridge, ca. 4 km East of D’Escousses. 06.v.2006 | Eutrophic creek |
R38 | Richmond Co., Isle Madame, Hwy 320 West, ca. 1 km West of D’Escousses. 06.v.2006 | Pool with dark brown water, in a vast field of Carex; Larix laricina present |
R39 | Richmond Co., Isle Madame, Hwy 320 West, ca. 2 km West of D’Escousses. 06.v.2006 | Shallow cattail pond in Picea forest |
R40 | Richmond Co., Sporting Mountain Road, ca. 2 km off Hwy 4 at exit 47. 06.v.2006 | Sphagnum bog in Picea forest. |
R41 | Richmond Co., Sporting Mountain Road, ca. 3 km off Hwy 4 at exit 47. 06.v.2006 | Small creek flowing on rocky bed with dense mats of Sphagnum/bryophytes; in Abies balsamifera and Betula allegheniensis forest |
R42 | Richmond Co., Sporting Mountain Road, dead end of Hwy 4 at exit 47. 06.v.2006 | Man-made shallow pond |
R43 | Richmond Co., Road off Sporting Mountain Road, towards St Peters lake. 06.v.2006 | Lake; shoreline with Sphagnum |
R44 | Richmond Co., Fleur-de-Lis trail, 3 km East of Grand River. 07.v.2006 | Road-side bog ditch with slow-moving dark brown water; heavy accumulation of Sphagnum and Scirpus. |
R45 | Richmond Co., Fleur-de-Lis trail at junction Barren Hill Road, ca. 6 km East Grand River. 07.v.2006 | Carex pool with Saricena purpurea |
R46 | Richmond Co., Fleur-de-Lis trail, ca. 9 km E. Grand River. 07.v.2006 | Pond in Picea forest; littoral margin with abundance of Scirpus and Ericacea |
R47 | Richmond Co., Fleur-de-Lis trail, ca. 6 km East of St. Esprit. 07.v.2006 | Inundated Picea forest; dark brown slow-moving water |
R48 | Richmond Co., North Framboise, 5 km W. off Fleur-de-Lis trail. 07.v.2006 | Small roadside ditch with Graminea |
C49 | Cape Breton Co., East Bay, Morrison Road, off Hwy 4. 08.v.2006 | Shallow pond fed with flowing water; rocky bed; clear water; dense Graminea along shoreline |
C50 | Cape Breton Co., East Bay, Morrison Road, off Hwy 4, past bridge. 08.v.2006 | Ephemeral pond with accumulation of dead leaves, in Acer, Fagus, and Abies forest |
C51 | Cape Breton Co., East Bay, Morrison Road, off Hwy 4, at bridge. 08.v.2006 | Discharge of lake; pond-like, very eutrophic; dense Graminea along shoreline |
C52 | Cape Breton Co., East Bay, Morrison Road, off Hwy 4, at bridge. 08.v.2006 | Shallow creek flowing over rocky bed; about 1 m wide |
C53 | Cape Breton Co., East Bay, Chapei Road, off Meadows Road, about 7 km S. of Hwy 4. 08.v.2006 | Ephemeral very humic pond with dead leaves; very dark water; shoreline with dense mats of bryophytes |
C54 | Cape Breton Co., Rear Big Pond Road, 6 km off junction with Chapei Road. 08.v.2006 | Small creek flowing over rocky bed |
C55 | Cape Breton Co., Rear Big Pond Road, 5 km off junction with Chapei Road at Big Pond. 08.v.2006 | Muddy creek with cold water; shoreline with Graminea and Sphagnum; in Picea and Abies balsamea forest |
C56 | Cape Breton Co., Rear Big Pond Road, 1 km off junction with Chapei Road. 08.v.2006 | Man-made pond; full of organic debris |
C57 | Cape Breton Co., Frank Macdonald Road, 9 km off junction with Soldier Cave Road, off Hwy 4. 09.v.2006 | Sphagnum bog |
C58 | Cape Breton Co., Frank Macdonald Road, 9 km off junction with Soldier Cave Road, off Hwy 4. 09.v.2006 | Roadside Typha pond |
C59 | Cape Breton Co., Frank Macdonald Road, 8 km off junction with Soldier Cave Road, off Hwy 4. 09.v.2006 | Typha pond |
C60 | Cape Breton Co., Frank Macdonald Road, 5 km off junction with Soldier Cave Road, off Hwy 4. 09.v.2006 | Shallow narrow creek with bryophytes. |
C61 | Cape Breton Co., Frank Macdonald Road, 4 km off junction with Soldier Cave Road, off Hwy 4. 09.v.2006 | Shallow Carex puddles |
R62 | Richmond Co., Loch Lamond West Road, 11 km of Grand River. 09.v.2006 | Emissary of Loch Lamond lake; collecting along river arms; shoreline covered with vegetation |
R63 | Richmond Co., Loch Lamond Road, 14 km of Grand River. 09.v.2006 | Pools covered with bryophytes; dark brown and cold water |
R64 | Richmond Co., Loch Lamond Road, 14 km of Grand River. 09.v.2006 | Small creek flowing over rocky bed |
R65 | Richmond Co., Loch Lamond Road, 16 km of Grand River. 09.v.2006 | Fen; dense accumulation of Graminea and bryophytes; very dark water |
I66 | Inverness Co., Greignish Mtns Road, 1 Km off junction Hwy 4B. 10.v.2006 | Pond |
I67 | Inverness Co., Road 104E, 2 km off junction to Greignish Mtns Road, off Hwy 19 at Greignish. 10.v.2006 | Fen with Scirpus and mats of bryophytes; dark brown water |
I68 | Inverness Co., Road 104E, 5 km off junction to Greignish Mtns Road, off Hwy 19 at Greignish. 10.v.2006 | Small brook in Sphagnum bog |
I69 | Inverness Co., Road 104E, 12 km off junction to Greignish Mtns Road, off Hwy 19 at Greignish. 10.v.2006 | Shallow pools with mats of Graminea and heavy accumulation of dead maple leaves; higher elevation |
I70 | Inverness Co., Road 104E, 4 km off junction to Greignish Mtns Road, off Hwy 19 at Greignish. 10.v.2006 | Bog with Carex and Saracenia purpurea |
I71 | Inverness Co., Road 104E, off junction to Greignish Mtns Road, off Hwy 19 at Greignish. 10.v.2006 | Bog with Carex |
I72 | Inverness Co., Graham River, at J. D. MacDonald Road near Judique South Hwy 19. 10.v.2006 | Stream flowing over rocky bed |
I73 | Inverness Co., Margaree River North East, off Cabot Trail. 17.viii.2006 | Larger river flowing over rocky bed |
I74 | Inverness Co., Ingram Charlie Brook, East Big Interval Road at bridge, 7 km of East Margaree Valley. 17.viii.2006 | Brook flowing over big boulders covered with bryophytes |
I75 | Inverness Co., East Big Interval Road, 12 km of East Margaree Valley. 17.viii.2006 | Small brook; beetles collected underneath the banks |
I76 | Inverness Co., East Big Interval Road, ca. 12 km of East Margaree Valley. 18.viii.2006 | Beaver dam ditch; dense mats of Carex along shoreline |
I77 | Inverness Co., East Big Interval Road, ca. 21 km of East Margaree Valley. 18.viii.2006 | Small creek with very slow-moving water (almost still); muddy bed, dark brown to black sediment |
I78 | Inverness Co., Kingross Crossing Road, ca. 1 km off East Big Interval Road, ca. 20 km of East Margaree Valley. 18.viii.2006 | Small pool with crystal clear water; pool likely formed from a brook |
I79 | Inverness Co., East Big Interval Road, ca. 2 km off Kingross Crossing Road. 18.viii.2006 | Small beaver dam pool, almost still water, fed from a small creek; muddy bottom, dark brown to black sediment |
I80 | Inverness Co., North of St. Joseph du Moine, Bazile Road, off Cabot trail at bridge. 21.viii.2006 | Small eutrophic creek; flowing water at the middle over rocky bed; shoreline with dense vegetation (Eupatorium maculatum; Equisetum sp.; muddy shoreline; beetles collected along shoreline in shallow water |
I81 | Inverness Co., North of Saint Joseph du Moine, Bazile Road, ca. 8 km off Cabot trail. 21.viii.2006 | Small creek with big boulders; swift currents |
I82 | Inverness Co., North of Saint Joseph du Moine, Bazile Road, off Cabot trail. 21.viii.2006 | Lake; littoral zone with Typha; muddy |
I83 | Inverness Co., North of Gold Brook, Cabot trail. 21.viii.2006 | Roadside ditch; shoreline with Spirea, Alnus, and Carex; heavy accumulation of dead leaves |
V84 | Victoria Co., Middle River, at Cabot trail. 21.viii.2006 | Roadside ditch with slow moving water; shoreline with Alnus and Carex |
V85 | Victoria Co., Egypt Road, at Cabot trail. 21.viii.2006 | Eutrophic brook with swift current; rocky bed; presence of algae |
I86 | Inverness Co., Cranton Cross Road, off Margaree Centre. 21.viii.2006 | Brook with crystal clear water; almost still water |
I87 | Inverness Co., Southwest Margaree Road, ca. 4 km south of Cabot trail. 22.viii.2006 | Roadside ditch in spruce forest |
I88 | Inverness Co., Southwest Margaree Road, ca. 8 km south of Cabot trail. 22.viii.2006 | Small eutrophic creek with dense vegetation along shoreline; deep, with slow moving water; rocky bed covered with sediments |
I89 | Inverness Co., Hwy 395 off Hwy 19. 22.viii.2006 | Small creek with swift current; cold water, large boulders; abundance of Mentha along shoreline |
I90 | Inverness Co., south west Margaree River at Bridge, Hwy 395 at junction to Kiltarlity Road. 22.viii.2006 | Arm of the river looking like a large ditch; shallow with clear water; dense vegetation (Carex, Scirpus, Myositis) along shoreline; accumulation of algae in the middle; extremely beetle rich |
I91 | Inverness Co., south west Margaree River at Bridge, Hwy 395 at junction to Kiltarlity Road. 22.viii.2006 | I have sampled into algae along shoreline of the river |
I92 | Inverness Co., Kiltarlity Road. 22.viii.2006 | Lake with clear water; Typha and nenuphar along shoreline |
I93 | Inverness Co., Scotsville, junction Hwy 395 and Scotsville Road at bridge. 22.viii.2006 | Emissary of lake Ainslie |
I94 | Inverness Co., near junction to Mountain Road and Scotsville Road. 22.viii.2006 | Shallow pond in open prairie overlooking lake Ainslie; main vegetation: Equisetum, Typha and Carex |
Nomenclature is based on the classification in
Voucher specimens are deposited in the author’s research collection (Department of Biology, Laurentian University, Sudbury, Ontario).
In total, 2027 specimens representing 85 species of Hydradephaga were collected in this study (Table
Species of Hydradephaga (Dytiscidae, Gyrinidae, Haliplidae) collected in Cape Breton Island, Nova Scotia, Canada in 2006 and 2007 with sample numbers (as in Table
Taxon | Sample numbers | AF (%) | RFO |
---|---|---|---|
Haliplidae | |||
Haliplus canadensis Wallis | C25, I78, I88 | 5 (0.25) | 3.19 |
Haliplus connexus Matheson | I79, I80, I93 | 4 (0.20) | 3.19 |
Haliplus cribarius LeConte | R62, I79 | 3 (0.15) | 2.13 |
Haliplus fulvus (Fabricius) | R45, C42, I78, I79, I90 | 11 (0.54) | 5.32 |
Haliplus immaculicollis Harris | V05, V11, V13, C25, V28, R37, R42, R44, C49, C58, R62, I69, I76, I77, I78, I79, I80, V84, I86, I87, I88, I90, I91, I92, I93 | 112 (5.53) | 26.60 |
Haliplus longulus LeConte | R45, I71 | 2 (0.10) | 2.13 |
Peltodytes edentulus (LeConte) | I91, I93 | 28 (1.38) | 2.13 |
Dytiscidae | |||
Acilius mediatus (Say) | V09, I83, I87 | 5 (0.25) | 3.19 |
Acilius semisulcatus Aubé | V04, R34, R39, I67, I92 | 7 (0.35) | 5.32 |
Agabus ambiguuus (Say) | V04, V09, V10, C25, V26, V28, C20, C49, I67, I76, I79, I80, I82, I83, V84, I90 | 76 (3.75) | 17.02 |
Agabus anthracinus Mannerheim | V03, C21, C22, C24, V26, V28, R29, R40, R46, R47, C49, C57, C59, C61, R63, R65, I67, I69, I76, I80 | 95 (4.69) | 21.28 |
Agabus erythropterus (Say) | V09, C25, R46, R48, I76, I77, I78, I79, I86; I90 | 76 (3.75) | 10.64 |
Agabus leptapsis (LeConte) | V12, I75, I76, I79, I80 | 5 (0.25) | 5.32 |
Agabus phaeopterus (Kirby) | V27 | 1 (0.05) | 1.06 |
Agabus semipunctatus (Kirby) | V03, C16, C24, V27, R46, C59 | 6 (0.30) | 6.38 |
Agabus subfuscatus Sharp | R29, R44, C61, R65, I66 | 13 (0.64) | 5.32 |
Clemnius laccophilinus (LeConte) | I92 | 1 (0.05) | 1.06 |
Colymbetes paykulli Erichson | V03, C61 | 2 (0.10) | 2.13 |
Colymbetes sculptilis Harris | I76, I80 | 2 (0.10) | 2.13 |
Copelatus glyphicus (Say) | V03, V04, V07, V27, C17, C18, C19, C24, R31, R44 | 64 (3.16) | 10.64 |
Coptotomus longulus LeConte | C21, R33 | 2 (0.10) | 2.13 |
Desmopachria convexa (Aubé) | C21, C24, R40, R45, R46, C57, C58, C59, I69, I70, I71, I94 | 70 (3.45) | 12.77 |
Dytiscus fasciventris Say | V84, I88, I92 | 4 (0.20) | 3.19 |
Dytiscus verticalis Say | R46, I69 | 2 (0.10) | 2.13 |
Heterosternuta allegheniana (Matta & Wolfe) | R31, R32, R64, I72 | 39 (1.92) | 4.26 |
Heterosternuta pulchra (LeConte) | R32, I73, V85, I88, I89 | 28 (1.38) | 5.32 |
Heterosternuta wickhami (Zaitzev) | I78, I79, V85 | 9 (0.44) | 3.19 |
Hydaticus aruspex Clark | C24, V26, C51, R65, I67, I70, I71, I94 | 9 (0.44) | 8.51 |
Hydrocolus paugus (Fall) | V03, C17, V27, R40, I67, I75, I80, V84 | 12 (0.59) | 8.51 |
Hydrocolus stagnalis (G. & H.) | V08, C18, C19, R46, C50, I90 | 7 (0.35) | 6.38 |
Hydroporus appalachius Sherman | I79, I86 | 33 (1.63) | 2.13 |
Hydroporus badiellus Fall | R40, C57, I70 | 13 (0.64) | 3.19 |
Hydroporus dentellus Fall | V09, V28, R40, R45, R46, R47, R65, I92, I93 | 24 (1.18) | 9.58 |
Hydroporus gossei Larson & Roughley | V12, V26, V27, C53, C59, I88, I90 | 11 (0.54) | 7.45 |
Hydroporus nigellus Mannerheim | C21, V28 | 2 (0.10) | 2.13 |
Hydroporus niger Say | C49, C59, I67, I88 | 7 (0.35) | 4.26 |
Hydroporus notabilis LeConte | V04, C18, C21, C24, V26, V27, V28, R42, C49, C61, I69, I76, I78, I80, I81, I83, V84, I87, I88, I90, I93, I94 | 52 (2.57) | 23.40 |
Hydroporus obscurus Sturm | I70 | 1 (0.05) | 1.06 |
Hydroporus puberulus LeConte | C53, I71 | 9 (0.44) | 2.13 |
Hydroporus rufinasus Mannerheim | R29, R45, R65 | 4 (0.20) | 3.19 |
Hydroporus signatus Mannerheim | V07, V10, C18, C17, C21, C24, V28, R29, R42, R46, R47, C49, C59, C61 | 34 (1.68) | 14.89 |
Hydroporus striola (Gyllenhal) | V03, V07, V26, V28, C20, R30, R32, R36, R38, R45, R46, C49, C53, C59, C61, I80, I83, V84, I88, I90 | 56 (2.76) | 21.28 |
Hydroporus tenebrosus LeConte | C18, C53, I93 | 4 (0.20) | 3.19 |
Hydroporus tristis (Paykull) | V07, V09, V14, C17, C18, C21, C24, V27, C50, C53, C59, C61, I77, I80, I83 | 44 (2.17) | 15.96 |
Hygrotus impressopunctatus (Schaller) | R35 | 1 (0.05) | 1.06 |
Hygrotus picatus (Kirby) | V04, C20, R46, R47, I76, I94 | 8 (0.40) | 6.38 |
Hygrotus sayi Balfour-Browne | V14, C25, V26, V28, R45, R47, C58, I80, I87, I88, I94 | 25 (1.23) | 11.70 |
Hygrotus turbidus (LeConte) | R39; I66 | 11 (0.54) | 2.13 |
Ilybiosoma seriatum (Say) | C02, V05, V08, C19, C23, C25, R31, C50, C52, C54, C60, R64, I67, I68, I74, I75, V85 | 76 (3.75) | 18.09 |
Ilybius angustior (Gyllenhal) | R39, R46, I83, | 6 (0.30) | 3.19 |
Ilybius biguttulus (Germar) | V03, V04, C21, C24, V28, R34, C49, C59, R64, I75, I76, I77, I80, I87, I88, I90, I92, I93, I94 | 106 (5.23) | 20.21 |
Ilybius confusus Aubé | I80 | 1 (0.05) | 1.06 |
Ilybius discedens Sharp | V27, R29, R46, C49, C57, I71, I92 | 11 (0.54) | 7.45 |
Ilybius erichsoni G. & H. | V07, C53 | 7 (0.35) | 2.13 |
Ilybius ignarus (LeConte) | V03, C21, V27 R45 | 6 (0.30) | 4.26 |
Ilybius larsoni (Fery & Nilsson) | V04, V06, V09, C18, C21, V27, R40, R48, C50, C61, I74 | 22 (1.09) | 11.7 |
Ilybius picipes (Kirby) | V26, I76 | 6 (0.30) | 2.13 |
Ilybius pleuriticus (LeConte) | C56, C59, I76, I87, I92 | 15 (0.74) | 5.32 |
Ilybius wasastjernae (C.R. Sahlberg) | V27 | 1 (0.05) | 1.06 |
Laccophilus m. maculosus Say | V13, C20, C22, C24, V28, R33, R34, R35, R42, C49, I66, I69, I80, I87 | 32 (1.58) | 14.89 |
Laccornis latens (Fall) | R29 | 6 (0.29) | 1.06 |
Liodessus affinis (Say) | V04, V26, V28, R34, R35, R42, C49, C59, R62, I90, I93 | 55 (2.71) | 11.70 |
Meridiorhantus sinuatus (LeConte) | R38, C52 | 3 (0.15) | 2.13 |
Nebrioporus rotundatus (LeConte) | C25, R32, I73, I88 | 35 (1.73) | 4.26 |
Neoporus carolinus (Fall) | V09, V12, V13, V15, V28, R40, R41, C49, C50, C52, C55, C57, I68, I75, I76, I77, I78, I79, I80, I86, I88 | 97 (4.79) | 22.34 |
Neoporus clypealis (Sharp) | R32, R62, I80, I88, I93 | 14 (0.69) | 5.32 |
Neoporus dimidiatus (G. & H.) | V28, I77, I78, I79, V84, I86, I88, I90, I91 | 44 (2.17) | 9.58 |
Neoporus spurius (LeConte) | I80, V85, I91 | 15 (0.74) | 3.19 |
Neoporus sulcipennis (Fall) | R64, 172, I80, I88, I89 | 28 (1.38) | 5.32 |
Neoporus undulatus (Fall) | C25, V28, R35, R43, R45, R47, I80, I87, I90, I92, I93 | 84 (4.14) | 11.70 |
Oreodytes s. scitulus (LeConte) | I72, I73 | 8 (0.40) | 2.13 |
Platambus obtusatus (Say) | V26, R38, R40, C50, C61, R64, I83 | 9 (0.44) | 7.45 |
Rhantus binotatus (Harris) | V04, V07, V26, R34, I67, I80, I83, V84, I94 | 15 (0.74) | 9.58 |
Rhantus suturellus (Harris) | V28, R46, R65 | 4 (0.20) | 3.19 |
Rhantus wallisi (Harris) | C24, R45, C59, C56, I66 | 11 (0.54) | 5.32 |
Gyrinidae | |||
Dineutus hornii Roberts | CO1, R35, I93 | 17 (0.84) | 3.19 |
Dineutus nigrior Roberts | R34, R35, C56 | 6 (0.30) | 3.19 |
Gyrinus affinis Aubé | R40, C53, C56, I76, | 32 (1.58) | 4.26 |
Gyrinus aquiris LeConte | C01, R45, R46; I90 | 9 (0.44) | 4.26 |
Gyrinus confinis Fall | R45 | 1 (0.05) | 1.06 |
Gyrinus fraternus Couper | R45; R62 | 16 (0.79) | 2.13 |
Gyrinus gehringi Chamberlain | V07, V13, R46, C53, I66, I76, V84, V85 | 48 (2.37) | 8.51 |
Gyrinus latilimbus Fall | V13, R45, C56, R62, I66, I76, I79 | 44 (2.17) | 7.45 |
Gyrinus pugionis Fall | C01, V14, R45, I92, I93 | 69 (3.40) | 5.32 |
Gyrinus sayi Aubé | V13, C21, R34, R35, R40, R45, R46, R47, C53, R62, I67, I76 | 29 (1.43) | 12.77 |
Total | 2027 |
This species is reported from 39 specimens collected in Richmond County and Inverness County (samples R31, R32, R64, I72).
All specimens were collected on pebble substrate or in leaf litter along the margin of cold creek and streams in accordance with
Prior to this study, Heterosternuta allegheniana had only been reported from New Brunswick and southern Québec (
This species is reported from nine specimens collected in Victoria County and Inverness County (samples I78, I79, V85).
Like the previous species all specimens were collected in gravel along the margins of streams.
This is the first record of H. wickhami in the Maritimes. Prior to this study it had only been reported from Ontario and Québec. Its presence on Cape Breton Island represents a significant extension of this species to eastern Canada (
Several specimens of this distinctive species were collected at two different sites in Inverness County (samples I79, I86).
Hydroporus appalachius is usually found in habitats where there are some water movements either along the margins of small lakes or in small streams and springs (
This species has a wide range in North America east of the Rocky Mountains. It occurs from Labrador and New Hampshire west to the northern Great Plains and north into the boreal zone and southern limits of the low artic (
This species is reported for the first time in Nova Scotia from eleven specimens collected in Cape Breton County, Inverness County and Victoria County (samples V12, V26, V27, C53, C59, I88, I90).
In Newfoundland and Prince Edward Island, this species has been collected from among flooded grasses and emergent Carex along the margins of beaver ponds and roadside ponds, which is similar to the habitats where these beetles were collected in Cape Breton Island which include also eutrophic creeks.
This large, distinctive Hydroporus species has generally been confused with Hydroporus rectus Fall. In the Maritime ecozone, H. gossei is also reported from the neighboring province New Brunswick and Prince Edward Island (
This species is reported from only two specimens collected in Cape Breton County and Victoria County (samples C21, V28).
These beetles are common in small pools with dense emergent vegetation. The two specimens collected in Cape Breton Island were from a sphagnum bog and a eutrophic pool besides a river.
Prior to this study, this species had only been reported from the neighboring province New Brunswick (
Hydroporus puberulus is reported from nine specimens form two localities in Cape Breton County and Inverness County (samples C53, I71).
These beetles were generally collected from small pools where the water is cool, such as small pools in bogs or habitats where the water is densely shaded by Carex (
In North America this Holarctic species occurs in the boreal zone from western Newfoundland to Alaska (
Ilybius picipes is closely similar to I. angustior (Gyllehal) from which it can be differentiated by the relative expansion of the protarsal claw (
These beetles are generally collected from peatland pools (
This species has a Holarctic distribution. In North America it is transcontinental in the boreal region (
Ilybius wasastjernae is reported in Cape Breton Island from only one specimen collected in Victoria County (sample V27).
These beetles are generally collected from sphagnum pools, usually in, or adjacent to forest (
This species has a Holarctic distribution more or less throughout the boreal zone. In North America it is transcontinental in the boreal region (
A total of 85 Hydradephaga species was recovered from 94 samples during a survey conducted on Cape Breton Island, Canada, between 2006–2007. According to this study and literature (
Checklist of species of Hydradephaga recorded from Cape Breton Island, Nova Scotia, Canada, and their provincial and territorial distribution within northeastern North America (NA). Key: asterisk (*), Holarctic species; cross (†), species not collected in this survey but recorded in Majka (2009); C, Cape Breton County; I, Inverness County; R, Richmond County; V, Victoria County; species in bold correspond to strict eastern Canada elements; i.e., never recorded west of the province of Ontario.
Taxon | Counties | Distribution in northeastern North America | |||
---|---|---|---|---|---|
C | I | R | V | ||
GYRINIDAE | |||||
Gyrininae | |||||
Enhydrini | |||||
Dineutus hornii Roberts | 1 | 1 | 1 | CT, MA, ME, MI, NB, NH, NS, NY, ON, PE, QC, RI | |
Dineutus nigrior Roberts | 1 | 1 | CT, MA, ME, MI, NB, NH, NS, ON, PE, QC, RI | ||
Gyrinini | |||||
Gyrinus affinis Aubé | 1 | 1 | 1 | LB, MA, ME, NB, NF, NH, NS, NY, ON, PE, QC, RI, VT | |
Gyrinis aquiris LeConte | 1 | 1 | 1 | LB, MA, ME, MI, NB, NF, NS, NY, ON, PE, QC, RI | |
Gyrinus cavatus Atton† | 1 | LB, MA, ME, NF, NH, NS, NY, ON, QC, RI | |||
Gyrinus confinis Fall | 1 | CT, LB, MA, ME, NB, NF, NH, NS, NY, ON, PE, QC, SM, VT | |||
Gyrinus fraternus Couper | 1 | MA, ME, NB, NH, NS, NY, ON, PE, QC, VT | |||
Gyrinus gehringi Chamberlain | 1 | 1 | 1 | 1 | NB, NS, NF, NH, ON, PE, QC |
Gyrinus impressicollis Kirby† | 1 | NS, ON, QC | |||
Gyrinus latilimbus Fall | 1 | 1 | 1 | 1 | CT, LB, MA, ME, NB, NF, NH, NS, NY, ON, PE, QC, SE |
Gyrinus pugionis Fall | 1 | 1 | 1 | MA, ME, MI, NB, NH, NS, NY, ON, PE, QC. VT | |
Gyrinus sayi Aubé | 1 | 1 | 1 | 1 | CT, MI, LB, MA, ME, NB, NF, NH, NS, NY, ON, PE, QC, RI, SM |
HALIPLIDAE | |||||
Haliplus canadensis Wallis | 1 | 1 | MA, NB, NS, ON, PE, QC | ||
Haliplus connexus Matheson | 1 | CT, MA, ME, NB, NH, NS, NY, ON, PE, QC, VT | |||
Haliplus cribarius LeConte | 1 | 1 | CT, LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC, SM | ||
Haliplus fulvus (Fabricius)* | 1 | 1 | 1 | ON, MA, ME, NB, NF, NH, NS, NY, ON, QC | |
Haliplus immaculicollis Harris | 1 | 1 | 1 | 1 | CT, LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, QC, PE, RI, SM, VT |
Haliplus longulus LeConte | 1 | 1 | MA, ME, NB, NH, NB, NS, NY, ON, PE, QC, RI | ||
Peltodytes edentulus (LeConte) | 1 | MA, NB, NH, NS, ON, QC, PE, RI | |||
DYTISCIDAE | |||||
Agabinae | |||||
Agabini | |||||
Agabus ambiguus (Say) | 1 | 1 | 1 | LB, ME, MI, NB, NF, NH, NS, ON, PE, QC, RI, SM | |
Agabus anthracinus Mannerheim | 1 | 1 | 1 | 1 | LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC, SM, VT |
Agabus erythropterus (Say) | 1 | 1 | 1 | 1 | CT, LB, MA, ME, NB, NF, NS, NY, ON, PE, QC, RI |
Agabus leptapsis (LeConte) | 1 | 1 | LB, ME, NB, NF, NS, NY, ON, QC, VT | ||
Agabus phaeopterus (Kirby) | 1 | LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC | |||
Agabus semipunctatus (Kirby) | 1 | 1 | 1 | CT, LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, QC, RI | |
Agabus subfuscatus Sharp | 1 | 1 | 1 | CT, LB, MA, ME, NB, NF, NH, NS, ON, PE, QC, VT | |
Ilybiosoma seriatum (Say) | 1 | 1 | 1 | 1 | CT, LB, MA, ME, MI, NB, NF, NH, NS, ON, PE, QC, SM |
Ilybius angustior (Gyllenhal)* | 1 | 1 | LB, MI, ME, NB, NF, NH, NS, ON, PE, QC, SM, VT | ||
Ilybius biguttulus (Germar) | 1 | 1 | 1 | 1 | MA, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC, RI, SM, VT |
Ilybius confusus Aubé | 1 | CT, MA, ME, NB, NH, NS, NY, ON, RI. VT | |||
Ilybius discedens Sharp* | 1 | 1 | 1 | 1 | LB, ME, MI, NB, NF, NH, NS, ON, PE, QC, SM |
Ilybius erichsoni G. & H.* | 1 | 1 | LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC | ||
Ilybius ignarus (LeConte) | 1 | 1 | 1 | CT, MA, ME, NH, NS, NY, ON, QC, RI | |
Ilybius larsoni (Fery & Nilsson) | 1 | 1 | 1 | 1 | NB, NS, ON, PE, QC |
Ilybius picipes (Kirby)* | 1 | 1 | LB, NF, NS, ON, QC | ||
Ilybius pleuriticus (Leconte) | 1 | 1 | CT, LB, MA, ME, MI, NB, NF, NS, ON, PE, QC, RI, SM, VT | ||
Ilybius wasastjernae (C. R. Sahlberg)* | 1 | ME, LB, NB, NF, NS, ON, QC | |||
Platambus obtusatus (Say) | 1 | 1 | 1 | 1 | CT, MA, ME, NB, NH, NS, NY, ON, QC, VT |
Colymbetinae | |||||
Colymbetini | |||||
Colymbetes paykulli Erichson* | 1 | 1 | LB, ME, NB, NF, NS, ON, PE, QC | ||
Colymbetes sculptilis Harris | 1 | CT, LB, MI, NB, NF, NH, NS, NY, ON, PE, QC, RI | |||
Meridiorhantus sinuatus (LeConte) | 1 | 1 | LB, MA, ME, NB, NF, NH, NS, NY, ON, PE, QC | ||
Rhantus binotatus (Harris) | 1 | 1 | 1 | CT, LB, ME, MI, NB, NF, NH, NS, ON, PE, QC, RI, SM | |
Rhantus suturellus (Harris)* | 1 | 1 | CT, LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC, SM | ||
Rhantus wallisi Hatch | 1 | 1 | 1 | LB, MA, MI, NB, NF, NH, NS, ON, PE, QC, SM | |
Copelatinae | |||||
Copelatini | |||||
Copelatus glyphicus (Say) | 1 | 1 | 1 | CT, ME, NF, NH, NB, NS, ON, PE, QC, RI | |
Coptotominae | |||||
Coptotomini | |||||
Coptotomus longulus LeConte | 1 | 1 | MA, ME, MI, NB, NH, NS, NY, ON, QC, NB, PE, RI | ||
Dytiscinae | |||||
Aciliini | |||||
Acilius mediatus (Say) | 1 | 1 | CT, MA, NB, NH, NS, ON, PE, QC, RI | ||
Acilius semisulcatus Aubé | 1 | 1 | 1 | CT, LB, MA, ME, MI, NB, NF, NH, NS, ON, PE, QC, RI, SM | |
Dytiscini | |||||
Dytiscus fasciventris Say | 1 | 1 | CT, LB, ME, NB, NH, NS, ON, PE, QC, RI | ||
Dytiscus verticalis Say | 1 | 1 | CT, MA, ME, NB, NH, NS, NY, ON, PE, QC, RI | ||
Hydaticini | |||||
Hydaticus aruspex Clark* | 1 | 1 | 1 | 1 | CT, LB, MA, ME, NB, NF, NH, NS, ON, PE, QC |
Hydroporinae | |||||
Bidessini | |||||
Liodessus affinis (Say) | 1 | 1 | 1 | 1 | CT, ME, NB, NF, NH, NS, ON, PE, QC, RI |
Hydroporini | |||||
Heterosternuta allegheniana (Matta & Wolfe) | 1 | 1 | NB, NS, QC | ||
Heterosternuta pulchra (LeConte) | 1 | 1 | 1 | CT, ME, LB, NB, NF, NS, ON, QC, SM | |
Heterosternuta wickhami (Zaitzev) | 1 | 1 | NS, ON, QC | ||
Hydrocolus paugus (Fall) | 1 | 1 | 1 | 1 | LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC, SM |
Hydrocolus stagnalis (G. & H.) | 1 | 1 | 1 | 1 | CT, MA, ME, NB, NH, NS, NY, ON, PE, QC |
Hydroporus appalachius Sherman | 1 | LB, MA, ME, NH, NS, ON, QC | |||
Hydroporus badiellus Fall | 1 | 1 | 1 | LB, ME, MI, NB, NF, NH, NS, ON, QC | |
Hydroporus dentellus Fall | 1 | 1 | 1 | LB, MA, ME, MI, NB, NH, NS, NY, ON, PE, QC | |
Hydroporus gossei Larson & Roughley | 1 | 1 | 1 | ME, NB, NF, NS, NY, ON, PE, QC | |
Hydroporus nigellus Mannerheim* | 1 | 1 | LB, NB, NS, ON, QC | ||
Hydroporus niger Say | 1 | 1 | CT, MA, MI, NB, NF, NH, NS, NY, ON, PE, QC, RI | ||
Hydroporus notabilis LeConte* | 1 | 1 | 1 | 1 | LB, MA, ME, MI, NB, NF, NH, NS, ON, PE, QC, SM |
Hydroporus obscurus Sturm* | 1 | LB, NB, NF, NS, ON, PE, QC, SM | |||
Hydroporus puberulus LeConte* | 1 | 1 | LB, ME, NB, NF, NS, ON, QC | ||
Hydroporus rufinasus Mannerheim | 1 | ME, NB, NS, ON, QC | |||
Hydroporus signatus Mannerheim | 1 | 1 | 1 | CT, LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC, RI, SM | |
Hydroporus striola (Gyllenhal)* | 1 | 1 | 1 | 1 | LB, ME, MI, NB, NF, NH, NS, ON, PE, QC, RI |
Hydroporus tenebrosus LeConte | 1 | 1 | MA, ME, MI, NB, NH, NS, NF, ON, PE, QC, | ||
Hydroporus tristis (Paykull)* | 1 | 1 | 1 | LB, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC, RI, SM | |
Nebrioporus rotundatus (LeConte) | 1 | 1 | 1 | LB, MA, ME, NB, NF, NS, ON, PE, QC, RI | |
Neoporus carolinus (Fall) | 1 | 1 | 1 | 1 | LB, MA, ME, NB, NF, NH, NS, NY, ON, PE, QC, SM |
Neoporus clypealis (Sharp) | 1 | 1 | ME, NB, NH, NS, NY, ON, PE, QC | ||
Neoporus dimidiatus (G. & H.) | 1 | 1 | CT, LB, MA, ME, NB, NF, NH, NS, ON, PE, QC, RI | ||
Neoporus spurius (LeConte) | 1 | 1 | NB, NS, ON, QC | ||
Neoporus sulcipennis (Fall) | 1 | 1 | NB, NH, NS, NY, ON, PE, QC, | ||
Neoporus undulatus (Say) | 1 | 1 | 1 | 1 | CT, LB, MA, ME, MI, NB, NF, NS, NY, ON, PE, QC, RI, SM |
Oreodytes s. scitulus (LeConte) | 1 | ME, LB, NB, NF, NH, NS, NY, ON, QC, SM | |||
Hygrotini | |||||
Clemnius laccophilinus (LeConte) | 1 | ME, NB, NH, NS, ON, PE, QC | |||
Hygrotus impressopunctatus (Schaller)* | 1 | LB, ME, MI, NB, NF, NH, NS, ON, PE, QC | |||
Hygrotus picatus (Kirby) | 1 | 1 | 1 | 1 | LB, MI, NB, NF, NH, NS, NY, ON, PE, QC, RI |
Hygrotus sayi Balfour-Browne | 1 | 1 | 1 | 1 | LB, MA, ME, MI, NB, NF, NH, NS, NY, ON, PE, QC, RI, SM, VT |
Hygrotus turbidus (LeConte) | 1 | 1 | MA, MI, NB, NH, NS, NY, ON, PE, QC, RI | ||
Hyphydrini | |||||
Desmopachria convexa (Aubé) | 1 | 1 | 1 | ME, MI, NB, NS, ON, PE, QC, RI | |
Laccornini | |||||
Laccornis latens (Fall) | 1 | MA, NB, NH, NS, NY, ON, PE, QC, | |||
Laccophilinae | |||||
Laccophilini | |||||
Laccophilus m. maculosus Say | 1 | 1 | 1 | 1 | CT, MA, ME, MI, NB, NH, NS, ON, PE, QC, RI |
Total | 48 | 68 | 56 | 50 |
Included among the species surveyed were eight new Nova Scotia records consisting of the dytiscid species Heterosternuta allegheniana (Matta & Wolfe), H. wickhami (Zaitzev), Hydroporus appalachius Sherman, H. gossei Larson & Roughley, H. nigellus Mannerheim, H. puberulus LeConte, Ilybius picipes (Kirby), and I. wasastjernae (C.R. Sahlberg) (Table
The Nearctic component of the fauna is made up of 71 species (81.6%), the Holarctic component of 16 species (17.4%). Most species are characteristic of both the Boreal and Atlantic Maritime Ecozones and have a transcontinental distribution except for Agabus erythropterus (Say), Copelatus glyphicus (Say), Coptotomus longulus LeConte, Heterosternuta allegheniana, H. pulchra (LeConte), H. wickhami, Hydroporus gossei, H. niger Say, Ilybius confusus Aubé, Ilybius ignarus (LeConte), I. larsoni (Fery & Nilsson), Laccornis latens (Fall), Liodessus affinis (Say), Nebrioporus rotundatus (LeConte), Neoporus carolinus (Fall), Neoporus clypealis (Sharp), N. spurius (LeConte), N. sulcipennis (Fall), and Platambus obtusatus (Say), which are generally recognized as species with eastern affinities (
The 87 Hydradephaga species known from Cape Breton Island represent approximately 74% of the fauna known for all Nova Scotia (
This research considerably extends the list of reported species in Richmond and Inverness counties both of which were considered the least well-known counties in all Nova Scotia in terms of its beetle fauna prior to this study. Many species recorded in this region are interesting in zoogeographic terms as representing new records for Nova Scotia (see above). The extraordinary species richness of rheophilic species (e.g., Agabus leptapsis (LeConte), A. erythropterus (Say), Heterosternuta allegheniana, H. pulchra, H. wickhami, Hydroporus appalachius, Neoporus clypealis (Sharp), Neoporus dimidiatus (G. & H.), N. spurius, N. sulcipennis (Fall), and Oreodytes s. scitulus (LeConte)) are worth emphasizing in that they illustrate the high abundance of lotic habitats in this portion of Cape Breton Island. In general, coexisting species may be more closely related than expected by chance if environmental features of a given habitat select for certain traits that are shared by closely related species (
The 87 species of Hydradephaga reported in this study represent an important richness, proportionally comparable to the number of species found in Prince Edward Island with similar environmental conditions (
Our study adds considerably to the previous knowledge about Hydradephaga in the Canadian Maritimes, with eight new records for the province of Nova Scotia. The composition of the Cape Breton fauna reflects that of the Maritime Provinces as a whole. Whereas all the species found on Cape Breton Island have also been recorded in New Brunswick (
Financial support was provided by a Discovery grant from the Natural Sciences and Engineering Research Council of Canada (NSERC).