Population Dynamics and Parasite Load of a Foraminifer on Its Antarctic Scallop Host with Their Carbonate Biomass Contributions
| Autor: | Alberto Pérez-Huerta, Samuel S. Bowser, Leanne G. Hancock, Sally E. Walker |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
Food Chain 010504 meteorology & atmospheric sciences Population Dynamics Population Antarctic Regions lcsh:Medicine Foraminifera 01 natural sciences Parasite Load Calcium Carbonate Sea ice Animals Ice Cover Marine ecosystem Biomass 14. Life underwater lcsh:Science education Cove Ecosystem 0105 earth and related environmental sciences geography education.field_of_study Multidisciplinary geography.geographical_feature_category biology Ecology 010604 marine biology & hydrobiology lcsh:R biology.organism_classification Pectinidae Adamussium lcsh:Q Cibicides Animal Distribution Bay Research Article |
| Zdroj: | PLoS ONE, Vol 10, Iss 7, p e0132534 (2015) PLoS ONE |
| ISSN: | 1932-6203 |
| DOI: | 10.1371/journal.pone.0132534 |
| Popis: | We studied the population dynamics and parasite load of the foraminifer Cibicides antarcticus on its host the Antarctic scallop Adamussium colbecki from three localities differing by sea ice cover within western McMurdo Sound, Ross Sea, Antarctica: Explorers Cove, Bay of Sails and Herbertson Glacier. We also estimated CaCO3 biomass and annual production for both species. Cibicides populations varied by locality, valve type, and depth. Explorers Cove with multiannual sea ice had larger populations than the two annual sea ice localities, likely related to differences in nutrients. Populations were higher on Adamussium top valves, a surface that is elevated above the sediment. Depth did not affect Cibicides distributions except at Bay of Sails. Cibicides parasite load (the number of complete boreholes in Adamussium valves) varied by locality between 2% and 50%. For most localities the parasite load was < 20%, contrary to a previous report that ~50% of Cibicides were parasitic. The highest and lowest parasite load occurred at annual sea ice localities, suggesting that sea ice condition is not important. Rather, the number of adults that are parasitic could account for these differences. Cibicides bioerosion traces were categorized into four ontogenetic stages, ranging from newly attached recruits to parasitic adults. These traces provide an excellent proxy for population structure, revealing that Explorers Cove had a younger population than Bay of Sails. Both species are important producers of CaCO3. Cibicides CaCO3 biomass averaged 47-73 kg ha(-1) and Adamussium averaged 4987-6806 kg ha(-1) by locality. Annual production rates were much higher. Moreover, Cibicides represents 1.0-2.3% of the total host-parasite CaCO3 biomass. Despite living in the coldest waters on Earth, these species can contribute a substantial amount of CaCO3 to the Ross Sea and need to be incorporated into food webs, ecosystem models, and carbonate budgets for Antarctica. |
| Databáze: | OpenAIRE |
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