Life-history strategies ofBrachionus havanaensissubject to kairomones of vertebrate and invertebrate predators

Autor:	S. Nandini, D. J. Chaparro-Herrera, S. S. S. Sarma, Cecilia Enríquez García
Rok vydání:	2007
Předmět:	education.field_of_study Ecology biology fungi Population Rotifer Brachionus biology.organism_classification Predation Kairomone General Earth and Planetary Sciences Ambystoma mexicanum education Predator Ecology Evolution Behavior and Systematics Copepod General Environmental Science
Zdroj:	Chemistry and Ecology. 23:303-313
ISSN:	1029-0370 0275-7540
DOI:	10.1080/02757540701525988
Popis:	We evaluated the different life-history strategies of the rotifer Brachionus havanaensis in the presence of vertebrate (salamander axolotl, Ambystoma mexicanum) or invertebrate (copepod Acanthocyclops robustus) predator using population growth and life-table demography at two algal food levels ($0.5\times 10^{6}$ and 1.0×106 cells ml−1 of Chlorella vulgaris). Generally, increased food availability resulted in higher densities of B. havanaensis. At any algal food level, B. havanaensis grown in the presence of kairomones showed higher population abundances than controls. Within the kairomone treatments, rotifers grown using A. mexicanum-conditioned medium showed a higher population growth than those using A. robustus medium. The average lifespan of B. havanaensis varied from 6 to 13 d, depending on the presence or absence of kairomones and the algal food density, the shortest being in treatments containing kairomones from Ambystoma. Gross (19–22 offspring female−1) and net reproductive rates (11 offspring f...
Databáze:	OpenAIRE
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