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Short term feeding responses to starvation in three species of small calanoid copepods

Artikel i vetenskaplig tidskrift
Författare Peter Tiselius
Publicerad i Marine Ecology-Progress Series
Volym 168
Sidor 119-126
ISSN 0171-8630
Publiceringsår 1998
Publicerad vid Institutionen för marin ekologi
Sidor 119-126
Språk en
Länkar <Go to ISI>://000075229700011
Ämnesord acartia tonsa, acartia clausia, centropages hamatus, clearance rates, hunger responses, acartia-tonsa, centropages-hamatus, planktonic copepod, vertical migration, marine copepod, egg-production, ingestion rate, behavior, pacificus, zooplankton
Ämneskategorier Biologiska vetenskaper, Ekologi

Sammanfattning

Three small, neritic copepods (Acartia tonsa, Acartia clausi, and Centropages hamatus) were exposed to short term (1 to 14 h) periods without food and their clearance over 2 h was measured. Clearance rates in controls consisting of copepods continuously exposed to 3500 cells ml(-1) of the diatom Thalassiosira weissflogii were 1.15 ml mu g(-1) dry wt d(-1) for A. tonsa, 0.65 for A. clausi and 0.35 for C. hamatus. When moved from filtered sea water to a suspension of 3500 T. weissflogii ml(-1), A. tonsa showed elevated (compared to controls) clearance rates after having been deprived of food for 6 h (+77 %) and 14 h (+44%). A. clausi only responded after 14 h of starvation (+60%) whereas C. hamatus showed a moderate response after 6 h without food (+14%). In day-night comparisons with A. tonsa, elevated clearance rates were significantly higher only during the day. Frequent estimates of clearance rates (20 min intervals) showed that the stimulating effect of food deprivation only lasted similar to 1 h in the case of 1 h of starvation but lasted more than 3 h after 14 h without food. Small species like the ones investigated here have more restricted vertical migration and may not leave the food-rich surface layer to avoid predation, as is commonly found in larger copepods. Instead, they have to balance food intake with predator avoidance continuously. The hunger responses observed in the study may allow the copepods to intermittently search for food or avoid predators and still maintain the same overall ingestion rate as constantly feeding animals.

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