Temporal variability in egg production rates of Acartia tonsa Dana in Long Island Sound |
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| Institution: | 1. The Southern Branch of the P.P. Shirshov Institute of Oceanology RAS, Gelendzhik, Krasnodar region, Russia;2. P.P. Shirshov Institute of Oceanology RAS, Nakhimovski av., Moscow, Russia;3. Laboratorio di Fisiologia delle Alghe e delle Piante, Dipartimento di Scienze della Vita e dell''Ambiente, Università Politecnica delle Marche, Ancona, Italy;4. STU-UNIVPM Joint Algal Research Center, Shantou, China;5. Institute of Microbiology, Academy of Sciences of the Czech Republic, Algatech, Trebon, Czech Republic;6. National Research Council, Institute of Marine Science ISMAR, Venezia, Italy;1. Department of Botany, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, CZ-783 71 Olomouc, Czech Republic;2. The Natural History Museum, Cromwell Road, London SW7 5BD, UK;1. School of Science, The University of Waikato, Private Bag 3105, Hamilton, New Zealand;2. National Institute of Water and Atmospheric Research Ltd. (NIWA), PO Boxs 11–115, Hamilton 3200, New Zealand |
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| Abstract: | The relationship between week-by-week variations in the in situ egg production rates of Acartia tonsa Dana and changes in chlorophyll concentration in several size fractions was investigated by incubating adult females in natural sea water for 24-h periods. Our results indicate that the egg production of A. tonsa in Long Island Sound was better related to the 10 μm chlorophyll size fraction than to the total chlorophyll concentration. The < 10 μm size fraction comprised the greatest percentage of the chlorophyll during July and August when the water column was stratified. Egg production rates were lowest (8.7 eggs · female−1 · day−1) in early August when less than 0.5 μg chlorophyll 1 −1 was observed in the 10 μm chlorophyll a size fraction. Following destratification in late August, the “fall” diatom bloom occurred and egg production rates increased to the maximum observed rate of 56.6 eggs · female−1 · day−1. At this time, the concentration of the 10μm chlorophyll size fraction was 5.5 μg 1−1. Maximum egg production rates were observed at chlorophyll concentrations as low as 0.8 μg 1−1 in the 10 μm size fraction. |
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