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High reproduction, but low biomass: mortality estimates of the copepod Acartia tonsa in a hyper-eutrophic estuary

Artikel i vetenskaplig tidskrift
Författare Peter Tiselius
C. M. A. Borg
B. W. Hansen
P. J. Hansen
T. G. Nielsen
B. Vismann
Publicerad i Aquatic Biology
Volym 2
Nummer/häfte 1
Sidor 93-103
ISSN 1864-7790
Publiceringsår 2008
Publicerad vid Institutionen för marin ekologi
Sidor 93-103
Språk en
Länkar <Go to ISI>://000259452400010
Ämnesord acartia tonsa, anoxia, egg production, mortality, mytilus edulis, mussel mytilus-edulis, pelagic food-web, egg-production, vertical-distribution, calanoid copepods, hatching success, mariager-fjord, resting eggs, baltic sea, high ph
Ämneskategorier Biologiska vetenskaper, Biofarmaci

Sammanfattning

Production, abundance and mortality of the copepod Acartia tonsa were studied for a period of 9 d in a hyper-eutrophic estuary, Mariager Fjord, Denmark. The estuary is characterised by oxygen-depleted and often sulphidic bottom water, and a relatively sparse mesozooplankton community with low species diversity. During the study, an intense phytoplankton bloom consisting mainly of the diatom Skeletonema costatum developed with chlorophyll a concentrations reaching 46 mu g l(-1). Egg production rate (EPR) in A. tonsa ranged from 30 to 65 eggs female(-1) d(-1), and egg hatching success was > 90 %, yet the abundance of copepods remained low (1 to 3 nauplii l(-1), 0.3 to 1.5 copepodites l(-1)). Calculated daily copepod mortality ranged from 18 % for nauplii, 16 % for Copepodite Stage C 1, up to 70 % for C2 and C3, then declining for older stages. The vertical distribution of copepodites in relation to the depth range of mussel beds suggests strong predation by suspension-feeding Mytilus edulis at depths of 5 to 10 m. Moreover, anoxia and the presence of sulphide in deep water, which prevented hatching of A. tonsa eggs and decreased the survivorship of older life stages sinking below 20 m depth, further contributed to the low copepod abundance.

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