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  4. Life-Cycle Strategies and Impact of Cannibalism in Calanoid North Sea Copepods
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-diss000108452

Life-Cycle Strategies and Impact of Cannibalism in Calanoid North Sea Copepods

Veröffentlichungsdatum
2007-10-19
Autoren
Wesche, Anne  
Betreuer
Hagen, Wilhelm  
Gutachter
Schiel, Sigrid  
Zusammenfassung
There were strong differences in life-cycles of dominant calanoid copepod species in the German Bight, although they show a similar seasonal course of abundance and reproduction. In a field study, stage-specific abundances, egg production rates, proportion of spawning females and hatching success of Acartia clausi, Temora longicornis, Centropages hamatus and C. typicus were estimated. The strategy of ceasing reproduction and hibernation of adult females (A. clausi) competed successfully with reproduction throughout the year combined with the production of resting eggs (T. longicornis), or with a strategy of virtual absence in winter and population built-up in spring by nauplii emerging from resting eggs (C. hamatus).In laboratory experiments, feeding rates of females on young copepod offspring were determined. The experiments showed the capability of adults to ingest eggs and nauplii. Predation was strongly influenced by prey density, behaviour of predator and prey, and concentration of alternative food. A theoretical approach demonstrated the potential of such predation to reduce the population sizes markedly during times of intense breeding.
Schlagwörter
Copepods

; 

North Sea

; 

Life-Cycle

; 

Cannibalism
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
Lade...
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Name

00010845.pdf

Size

1008.49 KB

Format

Adobe PDF

Checksum

(MD5):e2ed2624ef78d7c78dbb5cdf150c7a42

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