Life-history traits of the copepods Pseudocalanus minutus (Calanoida) and Oithona similis (Cyclopoida) in the Arctic Kongsfjorden (Svalbard) with particular emphasis on seasonality
|Other Titles:||Lebensstrategien der Copepoden Pseudocalanus minutus (Calanoida) und Oithona similis (Cyclopoida) im arktischen Kongsfjord (Svalbard) unter besonderer Berücksichtigung des Aspektes der Saisonalität||Authors:||Lischka, Silke||Supervisor:||Hagen, Wilhelm||1. Expert:||Hagen, Wilhelm||2. Expert:||Schiel, Sigrid||Abstract:||
The life-history traits of the copepods Pseudocalanus minutus (Calanoida) and Oithona similis (Cyclopoida) were investigated in the Arctic Kongsfjorden (Svalbard). In November, both species exhibited maximum abundances (P. minutus: 111,297 and O. similis: 704,633 ind m2), whereas minima occurred in June (1,088 and 4,483 ind m2, respectively). High levels of diatom marker fatty acids (16:1(n-7), 16:4(n-1), 20:5(n-3)) as well as high trypsin activities showed that the diatom bloom in spring was of specific importance for adult females and stage V copepodids of P. minutus to fuel final maturation processes and reproduction in May/June. O. similis generally followed an omnivorous feeding mode as indicated by consistently high amounts of the 18:1(n-9) fatty acid and the general predominance of the (dino-)flagellate biomarker 22:6(n-3). The first reproductive peak in June was primarily fueled by lipid reserves (wax esters), whereas the second reproductive peak in August/September co-occurred with energy storage for overwintering.
|Keywords:||Life-history traits, copepods, Pseudocalanus minutus, Oithona similis, Arctic, Kongsfjord, Svalbard, Spitsbergen, seasonality, abundance, lipids, fatty acid composition, digestive enzymes, trypsin)||Issue Date:||24-Nov-2006||URN:||urn:nbn:de:gbv:46-diss000105636||Institution:||Universität Bremen||Faculty:||FB2 Biologie/Chemie|
|Appears in Collections:||Dissertationen|
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