The egg production of a marine panktonic copepod in relation to its food supply - Laboratory studies

Citation:
Checkley, DM.  1980.  The egg production of a marine panktonic copepod in relation to its food supply - Laboratory studies. Limnology and Oceanography. 25:430-446.

Abstract:

Egg production by Paracalanus parvus, a particle-grazingcopepod, was investigated in relation to its food supply. The concentration of available food (P) and the rates of ingestion (I) and egg production (B) were measured simultaneously at intervals of 6 h to 2 d for periods of 2-10 d. Concentration, chemical composition (carbon and nitrogen), and species of phytoplankton were experimental variables.Egg production was related to the food ingested during the previous day. For one food type, I and B were rectilinear functions of P. The average maximum rates of ingestion and egg production were 1.1 µg N ∙ female^-1 ∙ d^-1 and 53 eggs ∙ female^-1 ∙d^-1, equivalent to specific rates of 1.5 and 0.37 d^-1. B was proportional to I below a critical ingestion rate, Ic, and independent of I above Ic. For I < Ic, the gross efficiency of egg production (B ∙ I^-1) in terms of nitrogen was 0.37 while in terms of carbon it was a hyperbolic function of the ratio of C:N in the food, ranging between 0.41 (C:Nfood= 4.0) and 0.15 (C:Nfood= 11). For I >Ic, B ∙ I^-1 declined in terms of both carbon and nitrogen.These results, together with the ratio of C:N in particulate matteri n the sea off southern California, suggest that nitrogen (hence protein) potentially limits egg production by adult female Paracalanus and that ingested carbon is used inefficiently.

Notes:

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