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Trends in the diversity, distribution and life history strategy of Arctic Hydrozoa (Cnidaria).

Ronowicz M, Kukliński P, Mapstone GM - PLoS ONE (2015)

Bottom Line: We address the hypothesis that the presence of a pelagic stage (holo- or meroplanktonic) was not necessary to successfully recolonize the Arctic by Hydrozoa after the Last Glacial Maximum.Our results support hypothesis that the presence of a pelagic stage (holo- or meroplanktonic) was not necessary to successfully recolonize the Arctic.The predominance of benthic Hydrozoa suggests that the Arctic could have been colonised after the Last Glacial Maximum by hydroids rafting on floating substrata or recolonising from glacial refugia.

View Article: PubMed Central - PubMed

Affiliation: Marine Ecology Department, Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland.

ABSTRACT
This is the first attempt to compile a comprehensive and updated species list for Hydrozoa in the Arctic, encompassing both hydroid and medusa stages and including Siphonophorae. We address the hypothesis that the presence of a pelagic stage (holo- or meroplanktonic) was not necessary to successfully recolonize the Arctic by Hydrozoa after the Last Glacial Maximum. Presence-absence data of Hydrozoa in the Arctic were prepared on the basis of historical and present-day literature. The Arctic was divided into ecoregions. Species were grouped into distributional categories according to their worldwide occurrences. Each species was classified according to life history strategy. The similarity of species composition among regions was calculated with the Bray-Curtis index. Average and variation in taxonomic distinctness were used to measure diversity at the taxonomic level. A total of 268 species were recorded. Arctic-boreal species were the most common and dominated each studied region. Nineteen percent of species were restricted to the Arctic. There was a predominance of benthic species over holo- and meroplanktonic species. Arctic, Arctic-Boreal and Boreal species were mostly benthic, while widely distributed species more frequently possessed a pelagic stage. Our results support hypothesis that the presence of a pelagic stage (holo- or meroplanktonic) was not necessary to successfully recolonize the Arctic. The predominance of benthic Hydrozoa suggests that the Arctic could have been colonised after the Last Glacial Maximum by hydroids rafting on floating substrata or recolonising from glacial refugia.

No MeSH data available.


Related in: MedlinePlus

Proportion of different zoogeographical groups of Hydrozoa in the Arctic regions.Abbreviations of regions: I—Iceland, WG—West Greenland, EG—East Greenland, BS—Barents Sea, WS—White Sea, KS—Kara Sea, LS—Laptev Sea, ESS—East Siberian Sea, CHS—Chukchi Sea, A&BS—Alaska & Bering Sea, BS&HAA—Beaufort Sea & High Arctic Archipelago, EC—East Canada, HC—Hudson Complex, CPB—Central Polar Basin.
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pone.0120204.g004: Proportion of different zoogeographical groups of Hydrozoa in the Arctic regions.Abbreviations of regions: I—Iceland, WG—West Greenland, EG—East Greenland, BS—Barents Sea, WS—White Sea, KS—Kara Sea, LS—Laptev Sea, ESS—East Siberian Sea, CHS—Chukchi Sea, A&BS—Alaska & Bering Sea, BS&HAA—Beaufort Sea & High Arctic Archipelago, EC—East Canada, HC—Hudson Complex, CPB—Central Polar Basin.

Mentions: The proportions of zoogeographical groups were similar among the studied polar regions (Fig. 4). Each region was dominated by Arctic-Boreal species from 39% in Alaska & Bering Sea to 54% in the Chukchi Sea. The highest ratio of Arctic species (approximately 20%) was noted in the Barents and East Siberian Seas. Boreal species occurred in higher numbers only in Alaska & Bering Sea (22% of all species); in other regions this group reached from 0 to 8%.


Trends in the diversity, distribution and life history strategy of Arctic Hydrozoa (Cnidaria).

Ronowicz M, Kukliński P, Mapstone GM - PLoS ONE (2015)

Proportion of different zoogeographical groups of Hydrozoa in the Arctic regions.Abbreviations of regions: I—Iceland, WG—West Greenland, EG—East Greenland, BS—Barents Sea, WS—White Sea, KS—Kara Sea, LS—Laptev Sea, ESS—East Siberian Sea, CHS—Chukchi Sea, A&BS—Alaska & Bering Sea, BS&HAA—Beaufort Sea & High Arctic Archipelago, EC—East Canada, HC—Hudson Complex, CPB—Central Polar Basin.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4368823&req=5

pone.0120204.g004: Proportion of different zoogeographical groups of Hydrozoa in the Arctic regions.Abbreviations of regions: I—Iceland, WG—West Greenland, EG—East Greenland, BS—Barents Sea, WS—White Sea, KS—Kara Sea, LS—Laptev Sea, ESS—East Siberian Sea, CHS—Chukchi Sea, A&BS—Alaska & Bering Sea, BS&HAA—Beaufort Sea & High Arctic Archipelago, EC—East Canada, HC—Hudson Complex, CPB—Central Polar Basin.
Mentions: The proportions of zoogeographical groups were similar among the studied polar regions (Fig. 4). Each region was dominated by Arctic-Boreal species from 39% in Alaska & Bering Sea to 54% in the Chukchi Sea. The highest ratio of Arctic species (approximately 20%) was noted in the Barents and East Siberian Seas. Boreal species occurred in higher numbers only in Alaska & Bering Sea (22% of all species); in other regions this group reached from 0 to 8%.

Bottom Line: We address the hypothesis that the presence of a pelagic stage (holo- or meroplanktonic) was not necessary to successfully recolonize the Arctic by Hydrozoa after the Last Glacial Maximum.Our results support hypothesis that the presence of a pelagic stage (holo- or meroplanktonic) was not necessary to successfully recolonize the Arctic.The predominance of benthic Hydrozoa suggests that the Arctic could have been colonised after the Last Glacial Maximum by hydroids rafting on floating substrata or recolonising from glacial refugia.

View Article: PubMed Central - PubMed

Affiliation: Marine Ecology Department, Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland.

ABSTRACT
This is the first attempt to compile a comprehensive and updated species list for Hydrozoa in the Arctic, encompassing both hydroid and medusa stages and including Siphonophorae. We address the hypothesis that the presence of a pelagic stage (holo- or meroplanktonic) was not necessary to successfully recolonize the Arctic by Hydrozoa after the Last Glacial Maximum. Presence-absence data of Hydrozoa in the Arctic were prepared on the basis of historical and present-day literature. The Arctic was divided into ecoregions. Species were grouped into distributional categories according to their worldwide occurrences. Each species was classified according to life history strategy. The similarity of species composition among regions was calculated with the Bray-Curtis index. Average and variation in taxonomic distinctness were used to measure diversity at the taxonomic level. A total of 268 species were recorded. Arctic-boreal species were the most common and dominated each studied region. Nineteen percent of species were restricted to the Arctic. There was a predominance of benthic species over holo- and meroplanktonic species. Arctic, Arctic-Boreal and Boreal species were mostly benthic, while widely distributed species more frequently possessed a pelagic stage. Our results support hypothesis that the presence of a pelagic stage (holo- or meroplanktonic) was not necessary to successfully recolonize the Arctic. The predominance of benthic Hydrozoa suggests that the Arctic could have been colonised after the Last Glacial Maximum by hydroids rafting on floating substrata or recolonising from glacial refugia.

No MeSH data available.


Related in: MedlinePlus