Influence of diatoms on copepod reproduction. I. Field and laboratory observations related to Calanus helgolandicus egg production

2006 ◽  
Vol 308 ◽  
pp. 129-142 ◽  
Author(s):  
SA Poulet ◽  
T Wichard ◽  
JB Ledoux ◽  
B Lebreton ◽  
J Marchetti ◽  
...  
Keyword(s):  
Egg Production ◽  
Calanus Helgolandicus

Feeding selectivity and egg production of Calanus helgolandicus in the English Channel

2000 ◽  
Vol 45 (1) ◽  
pp. 44-54 ◽  
Author(s):  
X. Irigoien ◽  
R. N. Head ◽  
R. P. Harris ◽  
D. Cummings ◽  
D. Harbour ◽  
...  
Keyword(s):  
Egg Production ◽  
English Channel ◽  
Feeding Selectivity ◽  
Calanus Helgolandicus

scholarly journals Temperature effects on Calanus helgolandicus (Copepoda: Calanoida) development time and egg production

2008 ◽  
Vol 31 (1) ◽  
pp. 31-44 ◽  
Author(s):  
D. Bonnet ◽  
R. P. Harris ◽  
L. Yebra ◽  
F. Guilhaumon ◽  
D. V. P. Conway ◽  
...  
Keyword(s):  
Temperature Effects ◽  
Egg Production ◽  
Development Time ◽  
Calanus Helgolandicus

On the Nutrition and Metabolism of Zooplankton XIV. Utilization of Lipid by Calanus Helgolandicus During Maturation and Reproduction

1980 ◽  
Vol 60 (2) ◽  
pp. 391-399 ◽  
Author(s):  
R. R. Gatten ◽  
J. R. Sargent ◽  
T. E. V. Forsberg ◽  
S. C. M. O'Hara ◽  
E. D. S. Corner
Keyword(s):  
Egg Production ◽  
Animal Species ◽  
Laboratory Data ◽  
Egg Laying ◽  
Wax Esters ◽  
English Channel ◽  
Calanoid Copepods ◽  
Female Adult ◽  
The Difference ◽  
Calanus Helgolandicus

The abundance of calanoid copepods in marine plankton and their importance as food for certain fishes has prompted numerous studies of their biology, including several concerned with fecundity (Marshall & Orr, 1952; Mullin & Brooks, 1967; Paffenhöfer, 1970). These studies, however, have all involved animals maintained on various diets in the laboratory: data for egg-production by Calanus under natural conditions in the sea are still needed.To ensure the survival of the young of many animal species to the stage of independent feeding, biochemical energy in the form of lipid is stored within the egg. During a recent survey of Calanus helgolandicus (Claus) from the English Channel the level of lipid, mainly in the form of wax esters, in Stage V copepodids was found to be substantially greater than that in female adult stages (Gatten et al. 1979). The difference was particularly noticeable during spring periods when egg-laying was in progress. This observation indicates a major role for wax esters during the reproduction of Calanus.The present study seeks to establish the fate of the lipid reserves in Stage V and female adult Calanus with particular emphasis on the extent to which the size of such reserves can be used as an index of the fecundity of this copepod.

Behavioural responses of the copepods Calanus helgolandicus and Temora longicornis to dinoflagellate diets

1987 ◽  
Vol 67 (4) ◽  
pp. 785-801 ◽  
Author(s):  
Catherine W. Gill ◽  
Roger P. Harris
Keyword(s):  
Egg Production ◽  
Sea Water ◽  
Feeding Activity ◽  
Activity Patterns ◽  
Beat Frequency ◽  
Surrounding Medium ◽  
Gut Contents ◽  
Scrippsiella Trochoidea ◽  
Temora Longicornis ◽  
Calanus Helgolandicus

Activity patterns of the first maxillae of Calanus helgolandicus and Temora longicornis, restrained in a flow-through system, were investigated using a micro-impedance electrode technique. Copepods were exposed to four dinoflagellate species of similar cell size with filtered sea water and the diatom Thalassiosira weissfloggi as controls. In short-term transition experiments the beat frequency of the maxilla changed rapidly with the introduction and removal of cells from the surrounding medium. Similarly the introduction of cell-free algal homogenate, filtered through a 0·2 µm membrane, produced elevated beat frequencies, evidence consistent with chemosensory food detection. During 24 h exposure experiments frequencies for Calanus on all dinoflagellate diets were lower than for the diatom, and in the case of Scrippsiella trochoidea did not differ significantly from the seawater controls. In Temora, frequencies when feeding on dinoflagellates, except Prorocentrum micans, were lower than on the diatom. With Scrippsiella trochoidea and Gonyaulax tamarensis beat frequencies were the same as those for the sea-water controls. Significant depression of frequency below that observed in filtered sea water was shown for both copepods when presented with the bloom-forming, Gyrodinium aureolum. Differences in beat frequency in response to dinoflagellate diets are mirrored by other aspects of feeding activity, gut contents, egg production and mortality.

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