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High reproduction, ...
High reproduction, but low biomass: mortality estimates of the copepod Acartia tonsa in a hyper-eutrophic estuary
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- Tiselius, Peter, 1958 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för marin ekologi,Department of Marine Ecology
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- Borg, C. M. A. (författare)
- Stockholms universitet,Systemekologiska institutionen
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Hansen, B. W. (författare)
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Hansen, P. J. (författare)
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Nielsen, T. G. (författare)
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Vismann, B. (författare)
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(creator_code:org_t)
- Inter-Research Science Center, 2008
- 2008
- Engelska.
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Ingår i: Aquatic Biology. - : Inter-Research Science Center. - 1864-7790 .- 1864-7782. ; 2:1, s. 93-103
- Relaterad länk:
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https://www.int-res....
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https://gup.ub.gu.se...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Farmaceutiska vetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Pharmaceutical Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Nyckelord
- 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
- Terrestrial, freshwater and marine ecology
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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