Experimental evidence of the grazing impact of Boeckella poppei on phytoplankton in a maritime Antarctic lake
The zooplankton biomass of Lake Boeckella (Hope Bay, Antarctic Peninsula) is strongly dominated by the calanoid copepod Boeckella poppei Mrázek. This work analyses the grazing impact of this copepod on the two dominant fractions of phytoplankton, pico- and nanoplankton, and on the bacterioplankton....
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2004
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| LEADER | 11574caa a22010217a 4500 | ||
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| 001 | PAPER-4340 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203352.0 | ||
| 008 | 190411s2004 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-11944275956 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 030 | |a POBID | ||
| 100 | 1 | |a Almada, P. | |
| 245 | 1 | 0 | |a Experimental evidence of the grazing impact of Boeckella poppei on phytoplankton in a maritime Antarctic lake |
| 260 | |c 2004 | ||
| 270 | 1 | 0 | |m Izaguirre, I.; Depto. de Ecologia, Genet. Y Evol., Fac. de Ciencias Exactas Y Naturales, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina; email: iri@bg.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a The zooplankton biomass of Lake Boeckella (Hope Bay, Antarctic Peninsula) is strongly dominated by the calanoid copepod Boeckella poppei Mrázek. This work analyses the grazing impact of this copepod on the two dominant fractions of phytoplankton, pico- and nanoplankton, and on the bacterioplankton. By means of in-situ experiments using microcosms, the following hypotheses were tested: (a) the early stages of the copepod mainly graze on phytoplankton; (b) the pre-adult and adult stages graze on phytoplankton and benthic algae. Copepods were separated into two groups of maturity: early stages, and pre-adult and adult stages. The following treatments were performed: (1) only nano-and picoplankton, (2) nano- and picoplankton + periphyton, and (3) only periphyton, for each one of the two copepod maturity groups, and (4) control (without copepods). The variation in nano-phytoplankton density was analysed after 2 and 4 days. The results determined a significant grazing on the nano-phytoplankton fraction in all microcosms containing copepods of both maturity groups (P<0.01). The effect on the nano-phytoplankton was greater when the copepods did not have another source of food (P < 0.01). No significant differences between the maturity groups were observed (P > 0.05). We also conclude that the copepods use the periphyton as an alternative source of food, which was corroborated by the analysis of gut content. In general, no significant differences among treatments were recorded for the pico-sized fraction (pico-phytoplankton and bacterioplankton), which would suggest that no direct grazing on this fraction exists. © Springer-Verlag 2004. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica | ||
| 536 | |a Detalles de la financiación: Instituto Antártico Argentino | ||
| 536 | |a Detalles de la financiación: Acknowledgements This work was supported by the Instituto Antártico Argentino, the University of Buenos Aires and a grant from the Agencia Nacional de Promoción Científica and Tec-nológica (Argentina). We thank the members of Esperanza Argentine Antarctic Station for their logistic support and Rubén Lombardo for his assistance with the statistical analyses. | ||
| 593 | |a Depto. de Ecologia, Genet. Y Evol., Fac. de Ciencias Exactas Y Naturales, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina | ||
| 593 | |a Consejo Nac. de Invest. Cie. Y Tec., Argentina | ||
| 690 | 1 | 0 | |a DIET |
| 690 | 1 | 0 | |a FEEDING ECOLOGY |
| 690 | 1 | 0 | |a PHYTOPLANKTON |
| 690 | 1 | 0 | |a STOMACH CONTENT |
| 690 | 1 | 0 | |a ZOOPLANKTON |
| 690 | 1 | 0 | |a ANTARCTIC PENINSULA |
| 690 | 1 | 0 | |a ANTARCTICA |
| 690 | 1 | 0 | |a ARCTIC AND ANTARCTIC |
| 690 | 1 | 0 | |a BOECKELLA LAKE |
| 690 | 1 | 0 | |a HOPE BAY |
| 690 | 1 | 0 | |a WEST ANTARCTICA |
| 690 | 1 | 0 | |a WORLD |
| 690 | 1 | 0 | |a ALGAE |
| 690 | 1 | 0 | |a BOECKELLA |
| 690 | 1 | 0 | |a BOECKELLA POPPEI |
| 690 | 1 | 0 | |a COPEPODA |
| 700 | 1 | |a Allende, L. | |
| 700 | 1 | |a Tell, G. | |
| 700 | 1 | |a Izaguirre, I. | |
| 773 | 0 | |d 2004 |g v. 28 |h pp. 39-46 |k n. 1 |p Polar Biol. |x 07224060 |t Polar Biology | |
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