Seasonal abundance of small cladocerans in Lake Mangakaware, Waikato, New Zealand
作者:
TraceyL. Greenwood,
JohnD. Green,
BrendanJ. Hicks,
M. Ann Chapman,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1999)
卷期:
Volume 33,
issue 3
页码: 399-415
ISSN:0028-8330
年代: 1999
DOI:10.1080/00288330.1999.9516886
出版商: Taylor & Francis Group
关键词: Cladocera;Bosmina;Ceriodaphnia;seasonal abundance;life history;competition;New Zealand
数据来源: Taylor
摘要:
The seasonal changes in the dynamics and life histories of the Cladocera in Lake Mangakaware, North Island, New Zealand, were studied over 19 months by sampling at weekly or 2‐weekly intervals. Lake Mangakaware is a 13.3 ha polymictic lake with high nutrient status, low Secchi disc transparencies, and an unstable thermal regime. The four planktonic cladoceran species (Bosmina longirostris, B. meridionalis, Ceriodaphnia pulchella, andC. dubia) exhibited disjunct population maxima. OnlyB. longirostriswas perennially present. All species exhibited low fecundities and low lipid content, indicating that food resources were limited and that competitive interactions and resistance to starvation were probably important in determining species success. Increases in body size in cooler seasons were unrelated to clutch size, giving further support for the view that available food was limited. These results are consistent with previous experimental findings that subtle differences in life history can determine seasonal success and the outcome of competition between similar species.
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