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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Autores principales: Almada, Pablo S., Allende, Luz, Izaguirre, Irina
Publicado: 2004
Materias:
diet
feeding ecology
phytoplankton
stomach content
zooplankton
Antarctic Peninsula
Antarctica
Arctic and Antarctic
Boeckella Lake
Hope Bay
West Antarctica
World
algae
Boeckella
Boeckella poppei
Copepoda
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v28_n1_p39_Almada
http://hdl.handle.net/20.500.12110/paper_07224060_v28_n1_p39_Almada
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_07224060_v28_n1_p39_Almada
record_format dspace
spelling paper:paper_07224060_v28_n1_p39_Almada2023-06-08T15:43:31Z Experimental evidence of the grazing impact of Boeckella poppei on phytoplankton in a maritime Antarctic lake Almada, Pablo S. Allende, Luz Izaguirre, Irina diet feeding ecology phytoplankton stomach content zooplankton Antarctic Peninsula Antarctica Arctic and Antarctic Boeckella Lake Hope Bay West Antarctica World algae Boeckella Boeckella poppei Copepoda 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. Fil:Almada, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Allende, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Izaguirre, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v28_n1_p39_Almada http://hdl.handle.net/20.500.12110/paper_07224060_v28_n1_p39_Almada
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic diet
feeding ecology
phytoplankton
stomach content
zooplankton
Antarctic Peninsula
Antarctica
Arctic and Antarctic
Boeckella Lake
Hope Bay
West Antarctica
World
algae
Boeckella
Boeckella poppei
Copepoda
spellingShingle diet
feeding ecology
phytoplankton
stomach content
zooplankton
Antarctic Peninsula
Antarctica
Arctic and Antarctic
Boeckella Lake
Hope Bay
West Antarctica
World
algae
Boeckella
Boeckella poppei
Copepoda
Almada, Pablo S.
Allende, Luz
Izaguirre, Irina
Experimental evidence of the grazing impact of Boeckella poppei on phytoplankton in a maritime Antarctic lake
topic_facet diet
feeding ecology
phytoplankton
stomach content
zooplankton
Antarctic Peninsula
Antarctica
Arctic and Antarctic
Boeckella Lake
Hope Bay
West Antarctica
World
algae
Boeckella
Boeckella poppei
Copepoda
description 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.
author Almada, Pablo S.
Allende, Luz
Izaguirre, Irina
author_facet Almada, Pablo S.
Allende, Luz
Izaguirre, Irina
author_sort Almada, Pablo S.
title Experimental evidence of the grazing impact of Boeckella poppei on phytoplankton in a maritime Antarctic lake
title_short Experimental evidence of the grazing impact of Boeckella poppei on phytoplankton in a maritime Antarctic lake
title_full Experimental evidence of the grazing impact of Boeckella poppei on phytoplankton in a maritime Antarctic lake
title_fullStr Experimental evidence of the grazing impact of Boeckella poppei on phytoplankton in a maritime Antarctic lake
title_full_unstemmed Experimental evidence of the grazing impact of Boeckella poppei on phytoplankton in a maritime Antarctic lake
title_sort experimental evidence of the grazing impact of boeckella poppei on phytoplankton in a maritime antarctic lake
publishDate 2004
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v28_n1_p39_Almada
http://hdl.handle.net/20.500.12110/paper_07224060_v28_n1_p39_Almada
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AT allendeluz experimentalevidenceofthegrazingimpactofboeckellapoppeionphytoplanktoninamaritimeantarcticlake
AT izaguirreirina experimentalevidenceofthegrazingimpactofboeckellapoppeionphytoplanktoninamaritimeantarcticlake
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