Data Paper |
Corresponding author: Claudia S. Maturana ( cmaturana.ciencias@gmail.com ) Academic editor: Danielle Defaye
© 2019 Claudia S. Maturana, Sebastián Rosenfeld, Javier Naretto, Peter Convey, Elie Poulin.
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:
Maturana CS, Rosenfeld S, Naretto J, Convey P, Poulin E (2019) Distribution of the genus Boeckella (Crustacea, Copepoda, Calanoida, Centropagidae) at high latitudes in South America and the main Antarctic biogeographic regions. ZooKeys 854: 1-15. https://doi.org/10.3897/zookeys.854.29614
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Copepods are present in numerous aquatic environments, playing key roles in food webs, and are thought to be useful indicators of environmental change. Boeckella is a calanoid copepod genus distributed mainly in the Southern Hemisphere, with 14 species reported at higher southern latitudes in South America and Antarctica. We present an updated database of these 14 species of Boeckella generated from a combination of three sources: 1) new field sampling data, 2) published records, and 3) Global Biodiversity Information Facility (GBIF), to provide a comprehensive description of the geographic distribution of the genus south of latitude 40°S in southern South America and the three main terrestrial biogeographic regions of Antarctica. The database includes 380 records, 62 from field sampling, 278 from the literature and 40 from GBIF. Southern South America, including the Falkland/Malvinas Islands, had the highest species richness and number of records (14 and 297, respectively), followed by the sub-Antarctic islands (5 and 34), South Orkney Islands (2 and 14), South Shetland Islands (1 and 23), Antarctic Peninsula (1 and 10) and finally continental Antarctica (1 and 2). Boeckella poppei Mrázek, 1901 is the only representative of the genus, and more widely the only terrestrial/freshwater invertebrate, currently reported from all three main biogeographic regions in Antarctica (sub-Antarctic islands, maritime and continental Antarctic). Future development of molecular systematic studies in this group should contribute to assessing the correspondence between morphological taxonomy and molecular evolutionary radiation.
Antarctica, Falkland/Malvinas Islands, freshwater ecosystems, sub-Antarctic islands, Patagonia
Knowledge of the diversity and distribution of organisms over space and time can provide information about changes in the composition of communities in different environments, particularly in sensitive ecosystems such as those in freshwater. Such information can also be used in biogeographic and niche modelling studies, contributing to understand the ecology of a given taxon. However, despite international efforts to increase the digitization of catalogues of specimens in museums and other repositories, even today only a small proportion of the total worldwide records are estimated to have been made available online through the efforts of the Global Biodiversity Information Facility (
Copepods are thought to be one of the most abundant metazoan groups in the world (
Boeckella is a freshwater calanoid copepod genus that currently includes 42 described species restricted to the Southern Hemisphere (
Fourteen species of Boeckella have been reported from higher southern latitudes (beyond 40°S) in South America, including Patagonia and Tierra del Fuego, Falkland/Malvinas Islands, various sub-Antarctic islands and Antarctica (
The present study provides an updated database of these 14 species of Boeckella, using a combination of recent sampling data, published records available in the literature and records from GBIF, giving a comprehensive description of the geographic distribution of the genus Boeckella at high latitudes in southern South America and the three main terrestrial biogeographic regions of Antarctica (sub-Antarctic islands, maritime and continental Antarctica; Convey 2013). This database will underpin future comprehensive systematic research on the genus, including the application of molecular phylogenetic approaches, allowing reconstruction of the regional evolutionary history of the genus, and in particular its members in the sub-Antarctic and Antarctic regions.
The dataset (
Boeckella records across this region were collated from three main sources: 1) recent field sampling data, 2) published literature and 3) data present in GBIF. Duplicate records were removed in combining these data to construct a unified database. To evaluate the quality of the collated data, all records were checked for mismatches between reported geographic location and the associated metadata, and taxonomically dubious records were excluded from the geospatial analysis.
Two main ecoregions in South America were considered for the purpose of geospatial analyses, the subpolar forest and grassland ecoregions as defined in the Terrestrial Ecoregions of the World (
New material was collected from multiple locations in southern South America between Sierra Baguales in Chilean Patagonia (50°45.015'S; 72°25.158'W) and the Diego Ramirez archipelago (56°31.345'S; 68°43.622'W). In the Falkland/Malvinas Islands we collected from multiple ponds between Port San Carlos (51°27.690'S; 58°46.763'W) and North Arm (52°00.121'S; 59°17.407'W).
New Antarctic material was collected from the South Shetland Islands and Palmer Land in the southern Antarctic Peninsula under the framework of Antarctic Expeditions ECA53 and ECA54 of the Chilean Antarctic Institute (INACH). Samples from Alexander Island in the southern Antarctic Peninsula, South Orkney Islands and South Georgia were obtained during British Antarctic Survey (BAS) expeditions (2016–2017 and 2017–2018). Samples from Kerguelen and Crozet Islands were obtained under the PROTEKER project during the French Polar Institute Paul Emile Victor (IPEV) expedition (2017).
Collections were made from the shoreline, scooping individuals from the water column of lakes, ponds and small pools using a zooplankton net (200 μm pore diameter) at locations across sub-Antarctic islands (Crozet, Kerguelen and South Georgia), maritime Antarctic (i.e. west side of Antarctic Peninsula, South Shetland Island and South Orkney Islands), part of the sub-polar forest ecoregion and Falkland/Malvinas Islands. Samples were immediately preserved in ethanol (99%), except for a small number of collected specimens that were preserved using formalin (5%) for morphological analysis. GPS positions were recorded for each sample location.
Morphological observations were performed under a stereomicroscope (LEICA EZ4) at 3.5× magnification. For determination to species level, the fifth leg was removed from male specimens and observed under an inverted microscope at 10× and 20× for confirmation of diagnostic characters as described by
All available information was collated from the scientific literature reporting sampling or taxonomic revision of Boeckella species in southern South America, the sub-Antarctic islands, maritime and continental Antarctica. We included Boeckella records from 1855 to 1997 listed in the historical review of
All georeferenced records for the genus Boeckella for the targeted study area were retrieved from the GBIF database on 30 July 2018. Records lacking precise geographic location (coordinates) were assigned georeferences by identification from the description of the reported collection locality included in the relevant metadata. The species list was updated to exclude erroneous or suspect records, rule out possible synonymies and include current taxonomy.
The data underpinning the analysis reported in this paper are deposited at GBIF, the Global Biodiversity Information Facility (
A total of 815 unfiltered records were retrieved from all sources combined. Of these, 380 records were from the targeted study area (
Boeckella silvestrii Daday, 1901, described in South America, has also been reported by GBIF in the South Orkney (https://www.gbif.org/occurrence/1056439704) and South Shetland Islands (https://www.gbif.org/occurrence/1056871457). Previously,
Boeckella longicauda (Daday, 1901) has only been reported in the literature from southern Argentina (
Fourteen species were recorded across the targeted study area (Fig.
Spatial distribution of 14 Boeckella species from the targeted study area. The western (left side) and eastern (right side) of southern South America (green/blue: subpolar forest; brown: grassland), sub-Antarctic islands (light blue) and maritime Antarctic regions (light grey) obtained from records (red: obtained from field sampling; blue: obtained from literature and GBIF database) of all combined data sources. *: discrete outlier records; dash bars: distribution extended north of 40°S; dashed lines: geographic discontinuity. Records from East Antarctic were not included.
Within the grassland ecoregion, four species were reported from the Falkland/Malvinas Islands (B. brevicaudata (Brady, 1875), B. michaelseni (
Based on our sampling data, we identified six species distributed mainly in southern South America (B. brevicaudata, B. meteoris Kiefer, 1928, B. poppei, B. brasiliensis (Lubbock, 1855)), the Falkland/Malvinas Islands (B. michaelseni) and the sub-Antarctic islands (B. vallentini), adding 62 new records to the existing data (Fig.
Map of the sampling locations in South America, sub- and maritime Antarctica. Six species were identified following the traditional taxonomic key (
Increasing availability of data and the application of new molecular biological analyses and modeling techniques have generated the need for revision of the geographic distribution of many taxa. The present compilation and classification of Boeckella records represents a contribution to biodiversity knowledge and to the biogeographic distribution of members of the genus across three large-scale biogeographic regions in Antarctica and two ecoregions in southern South America. It is also appropriate to note here that recent research has recognized that the long-used three region classification of Antarctic terrestrial biogeographic regions does not expresses the full regional complexity of terrestrial biogeography in Antarctica, with 16 “Antarctic Conservation Biogeographic Regions” now recognized within the continent, five of which are contained in the maritime Antarctic as considered in the current study (
Six of the 14 species of Boeckella occurring at high latitudes recorded in this study have been reported as exclusively distributed south of 40°S in South America (B. brevicaudata, B. vallentini, B. silvestrii, B. antiqua Menu-Marque & Balseiro 2000, B. michaelseni and B. longicauda
The distribution of B. poppei is exceptional within the genus, including the Andean Region in South America (
The two ecoregions examined in southern South America were the richest in terms of number of species and records available (14 and 297, respectively), followed by the sub-Antarctic islands (5 and 34), the maritime Antarctic (2 and 47) and finally the continental Antarctic (1 and 2). There is an important geographic gap in available records between the western Antarctic Peninsula and Enderby Sector in continental Antarctica. In a recent review of freshwater fauna in the south polar region,
The presence of B. vallentini in the Falkland/Malvinas Islands and several sub-Antarctic islands (Kerguelen, Heard, South Georgia and Prince Edward Islands), but not in continental South America, must be noted (Table
List of the 14 species of Boeckella considered in this study with their distribution in the targeted study area. *: Confirmed occurrence, **: Dubious record
Species | South America | Falkland/Malvinas Islands | Sub-Antarctic Islands | Antarctica |
---|---|---|---|---|
Boeckella antiqua Menu-Marque & Balseiro, 2000 | * | |||
Boeckella bergi Richard, 1897 | * | |||
Boeckella brasiliensis (Lubbock, 1855) | * | |||
Boeckella brevicaudata (Brady, 1875) | * | * | * | |
Boeckella gracilipes Daday, 1901 | * | |||
Boeckella gracilis (Daday, 1902) | * | |||
Boeckella gibbosa (Brehm, 1935) | * | |||
Boeckella longicauda Daday, 1901 | * | ** | ||
Boeckella meteoris Kiefer, 1928 | * | |||
Boeckella michaelseni (Mrázek, 1901) | * | * | * | |
Boeckella poopoensis Marsh, 1906 | * | |||
Boeckella poppei (Mrázek, 1901) | * | * | * | * |
Boeckella silvestrii Daday, 1901 | * | ** | ** | |
Boeckella vallentini (T. Scott, 1914) | * | * |
The complexity of the morphology in this family of crustaceans, along with apparent plasticity in the diagnostic characters, can clearly lead to errors and considerable taxonomic and nomenclatural confusion (e.g.
This study utilized material obtained under several different projects and institutions, including South Atlantic Environment Research Institute (Falkland Islands/Islas Malvinas), FONDECYT 1161358, initiation FONDECYT program 11160391, INACH DT-04_16, Institute of Ecology and Biodiversity (Chile) CONICYT PIA APOYO CCTE AFB170008, P05-002 ICM and Conicyt Ph.D. Grant (21150317) to C.M., and NERC core funding to the BAS “Biodiversity, Evolution and Adaptation” Team to P.C. We also appreciate the support of the following projects: J.N. (Conicyt Ph.D. Grant 21140632; INACH DG-03_16), E.P. (regular Fondecyt project 1151336, PIA-CONICYT ACT172065), IPEV program PROTEKER (No. 1044). S.R. gives particular thanks to the Chilean Navy, the Commander in Chief of the III Naval Zone, Rear Admiral Ivo Brito, the Chief of General Staff, Vice Admiral José Miguel Rivera, the National Oceanographic Committee and the Naval Beagle Command, as well as the crew of the ship OPV 83 Marinero Fuentealba, and the helicopter and institutional logistics personnel. We also thank Roy Mackenzie and the staff of the lighthouse of Gonzalo Island for their invaluable support for the development of field research at the permanent ecological studies site implemented in the Diego Ramírez archipelago. S.R. and C.M. would like to thank Fernando Basualdo and Luciano Caputo for their valuable support to our fieldwork in Sierra Baguales and Última Esperanza. We especially thank Lafayette Eaton for English revision and editing and to Patricio De los Rios, Danielle Defaye and one anonymous reviewer for their helpful comments.
Occurrences of Boeckella at high latitudes in the southern hemisphere. v1.1.
Data type: ocurrence dataset