Changes in cephalothorax length of diatomus oregonensis as an indicator of generations

Lai, H. C.

doi:10.1007/bf00018767

Cited by 5 publications

(1 citation statement)

References 7 publications

(9 reference statements)

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“…The earliest adults of the 1972 generation appeared in early June, were very large, and could be distinguished from the 1971 generation adults on the basis of a size analysis ( Fig. 4), a method often used for distinguishing different generations of a population (Tonolli 1964, Lai 1977. A few of the earliest adult females of the 1972 generation produced eggs almost immediately, giving rise to a very small summer generation.…”

Section: General Description Of Ihe Populationmentioning

confidence: 99%

Production and population dynamics of Leptodiaptomus sicilis in a mountain lake in Alberta, Canada

Herzig

Anderson

Mayhood³

1980

Ecography

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Leptodiaptomus sicilis (S. A. Forbes 1882) in Pyramid Lake, Alberta, Canada, has only one main generation per year. A small summer generation probably does not survive. Adults may persist for 7 to 12 months, and individual copepods may live for up to 17 months. Retardation of the development of copepodid C4 and C 5 seems to be food linked. The high percentage of survivors (up to 97%) from the first egg pulse of the main generation, and the low percentage of survivors (as low as 3%) from the second egg pulse, is likely due to the absence of cyclopoid adults and copepodids in spring, and to both cyclopoid predation and a poor food regime in summer. Production estimates by several methods gave closely comparable results. Mean daily production by L. sicilis is 0.29 mg dry weight m‐3, and the annual P/B ratio is 2.63.

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Section: General Description Of Ihe Populationmentioning

confidence: 99%

Production and population dynamics of Leptodiaptomus sicilis in a mountain lake in Alberta, Canada

Herzig

Anderson

Mayhood³

1980

Ecography

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Predator-induced behavioral defense and its ecological consequences for two calanoid copepods

Ramcharan

Sprules

1991

Oecologia

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We used an automated technique for the observation and quantification of zooplankton swimming behavior to study the behavioral responses of two congeneric, herbivorous, freshwater copepod prey to a copepod predator (Limnocalanus macrurus). One prey, Diaptomus sicilis, often co-occurs with Limnocalanus, while previous studies indicated that the zoogeographic distribution of the second prey, Diaptomus oregonensis, was independent of the predator. We found that in the presence of Limnocalanus, D. sicilis swims more slowly and with less hopping and jumping than D. oregonensis. Diaptomus sicilis is also attacked and consumed by the predator Limnocalanus macrurus less frequently than D. oregonensis. We suggest that the faster, "noisier" swimming of D. oregonensis increases its vulnerability to Limnocalanus. The behavioral defenses to both prey are induced by the presence of the predator, and may represent two different anti-predator strategies, "crypsis" and "avoidance" for D. sicilis and D. oregonensis respectively. In a zoogeographical analysis D. oregonensis occurs at densities below D. sicilis in lakes where Limnocalanus is at elevated abundances, while in "low-predator" lakes the opposite is true. This distribution pattern supports our experimental results, and suggests that D. sicilis is adapted to survive with Limnocalanus, while D. oregonensis is not.

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Influence of cultivation and food concentration on body length of calanoid copepods

Breteler

Gonzalez

1982

Mar. Biol.

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Changes in cephalothorax length of diatomus oregonensis as an indicator of generations

Abstract: Seasonal changes in cephalothorax length of Diaptomus oregonensis have been suggested as a means to segregate its life cycle . Problems associated with this technique are also discussed .

Cited by 5 publications

References 7 publications

Production and population dynamics of Leptodiaptomus sicilis in a mountain lake in Alberta, Canada

Production and population dynamics of Leptodiaptomus sicilis in a mountain lake in Alberta, Canada

Predator-induced behavioral defense and its ecological consequences for two calanoid copepods

Influence of cultivation and food concentration on body length of calanoid copepods

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