Egg production of the marine, planktonic copepod, Calanus pacificus Brodsky: Laboratory observations

Runge, Jeffrey A.

doi:10.1016/0022-0981(84)90037-6

Cited by 148 publications

(96 citation statements)

References 19 publications

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“…Temperature is known to be an important factor controlling copepod fecundity (Runge 1984, Beckman & Peterson 1986, Kiarboe et al 1988a, b, Kleppel 1992, Hirakawa 1995 and this is also suggested by multivariate statistics in the present study. Food availability is obviously of critical importance in determining egg production, and of the various descriptors of food availability determined here, particulate fatty acid concentration was clearly the most closely correlated with fecundity, supporting studies by Jonasdottir (1994) and Jonasdottir et al (1995).…”

Section: Fecunditysupporting

confidence: 80%

Environmental and nutritional factors determining seasonal variability in the fecundity and egg viability of Calanus helgolandicus in coastal waters off Plymouth, UK

Pond¹,

Harris²,

Head³

et al. 1996

Mar. Ecol. Prog. Ser.

201

180

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Fecundity of the copepod Calanus helgolandicus was monitored at a coastal station in the western English Channel during January to September 1994 and varied seasonally from 3 to 33 eggs female-' d-l (mean 17 eggs female-' d-'). Particulate fatty acid levels, particularly in the <20 pm size fraction, were more highly correlated with fecundity than either chl a, particulate carbon or nitrogen. and this reflected the size and species composition of the microplankton. Diatoms, dinoflagellates and ciliates all sustained high fecundity. The mean volume of eggs produced by C. helgolandicus was inversely related to both food availability and fecundity, with increased numbers of smaller eggs produced during per~ods of high food availability. Female C helgolandicus with the highest body nitrogen and carbon produced eggs with the highest carbon and nltrogen contents, although these eggs were also smaller. Hatching viability was consistently high with a seasonal mean of 83% and both viability and the incidence of deformed nauplii were negatively correlated with the carbon and nitrogen content of females and eggs. Hatching viability was not correlated with the abundance of diatoms, but was closely correlated with the levels of 18:2(n-6) and 20:4(n-6) fatty acids in both the environment and in the eggs. Particulate concentrations of the polyunsaturated fatty acids 20:5(n-3) and 22:6(n-3), although abundant in the environment and therefore good indicators of food availability, were not correlated with either egg viability or naupliar survival. The levels of saturated and monounsaturated fatty acids in the eggs were important factors determining naupliar survival under starvation conditions. Although food availability limited fecundity, female recruitment was possibly limited by predation pressure. particularly during the late summer. This study highlights the value of seasonal and nutritional based studies in understanding variability in zooplankton fecundity.

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Section: Fecunditysupporting

confidence: 80%

Environmental and nutritional factors determining seasonal variability in the fecundity and egg viability of Calanus helgolandicus in coastal waters off Plymouth, UK

Pond¹,

Harris²,

Head³

et al. 1996

Mar. Ecol. Prog. Ser.

201

180

View full text Add to dashboard Cite

show abstract

“…The functional model in Fig. 9 shows that fecundity is controlled primarily by food abundance, whatever the type of algal diet, following a well-established relationship in copepods (Runge 1984, Hirche et al 1991, Plourde & Runge 1993. However, a fraction of this production is not viable.…”

Section: Discussionmentioning

confidence: 87%

Reproductive response of Calanus helgolandicus. I. Abnormal embryonic and naupliar development

Poulet¹,

Laabir²,

Ianora³

et al. 1995

Mar. Ecol. Prog. Ser.

106

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Abnormal embryonic development is described for the copepod Calanus helgolandicus Anomalies followed ingestion of diatoms by females which led to erroneous synchronization between nuclear division and cytok~nesis, with malformation of the cellular membrane between daughter cells during mitosis. Similar types of cellular anomalies and morphological deformities, reported for the first time in the embryonic and naupliar stages of C. helgolandicus, were observed both in the laboratory and in situ. The ecological Importance of this process as a factor controlling mortality and recruitment of copepods In the ocean IS discussed.

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“…First, short-term history can be assessed by modifying environmental conditions during egg production experiments and comparing the results with controls where conditions remain stable. A certain number of studies have been carried out following this protocol (Runge 1984, Frost 1985, Attwood & Peterson 1989, Nival et al 1990, Carlotti & Hirche 1997, Båmstedt et al 1999. In most of the cases, food concentration was modified during the experiment in order to mimic the field situation in which the females do not encounter homogeneous food concentration but rather patchily distributed food.…”

Section: Abstract: Calanus Helgolandicus · Female · Egg Production Rmentioning

confidence: 99%

“…However, because the gonad of the females at low food concentration often reverted to an immature stage after laying eggs, these females may have to spend more energy (i.e. draw on their own body resources) to mature their gonad again before the next spawning event, compared with females at high food concentration, which remain mature between 2 spawning events (Runge 1984, Niehoff & Hirche 1996, Niehoff et al 1999. Since a decrease in weight occurred for both females held at high and low food concentration, it may be that the experimental conditions induced stress and increased the metabolic costs.…”

Section: Influence Of Actual Food Concentration On Femalesmentioning

confidence: 99%

Egg production rates of Calanus helgolandicus females reared in the laboratory: variability due to present and past feeding conditions

Rey-Rassat¹,

Irigoien²,

Harris³

et al. 2002

Mar. Ecol. Prog. Ser.

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Egg production of the marine, planktonic copepod, Calanus pacificus Brodsky: Laboratory observations

Cited by 148 publications

References 19 publications

Environmental and nutritional factors determining seasonal variability in the fecundity and egg viability of Calanus helgolandicus in coastal waters off Plymouth, UK

Environmental and nutritional factors determining seasonal variability in the fecundity and egg viability of Calanus helgolandicus in coastal waters off Plymouth, UK

Reproductive response of Calanus helgolandicus. I. Abnormal embryonic and naupliar development

Egg production rates of Calanus helgolandicus females reared in the laboratory: variability due to present and past feeding conditions

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