Modeling of egg production by Temora longicornis from the southern Baltic Sea including salinity

Author:

Dzierzbicka-Głowacka Lidia1,Lemieszek Anna2,Musialik Maja2,Żmijewska Iwona2

Affiliation:

1. Institute of Oceanology, Polish Academy of Sciences , ul. Powstańców Warszawy 55, 81-712, Sopot , Poland

2. Institute of Oceanography , University of Gdańsk , Al. M. Piłsudskiego 46, 81-378, Gdynia , Poland

Abstract

Abstract The paper presents modeling of egg production (Egg — no. of eggs female−1 d−1) by Temora longicornis in the changing environmental conditions of the southern Baltic Sea (Gdańsk Deep). It is hypothesized that the food-saturated rate of egg matter production is equivalent to the specific growth rate of copepods. Based on the findings from the south-western Baltic Sea, Egg of T. longicornis is evaluated as a function of food concentration, temperature and salinity over a wide range of these parameters. Subsequently, the rate of reproduction during the seasons in the Gulf of Gdańsk is determined. According to our calculations, values of Egg reach ca 11 eggs per day in April and decline strongly in June-July, while the second smaller peak in reproduction occurs in September, ca 8 eggs per day. Our results suggest that egg production rates of T. longicornis depend not only on food concentration and temperature, but also on salinity, which is a masking factor in the Baltic Sea.

Publisher

Walter de Gruyter GmbH

Subject

Oceanography

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