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  • 1
    Publication Date: 2012-11-11
    Description: Kurzfassung Im Rahmen einer Bachelorarbeit wurde untersucht, ob die Larven des frühjahrslaichenden Herings der westlichen Ostsee im Greifswalder Bodden eine inhomogene vertikale Verteilung aufweisen, da in bisherigen Studien aufgrund der niedrigen Gewässertiefe des Boddens von hydrografischer Durchmischung und somit homogener Ichthyoplanktonverteilung ausgegangen wurde. Dazu wurden zwei Nullhypothesen überprüft, eine, die annimmt, dass Heringslarven allgemein im Greifswalder Bodden homogen verteilt sind, eine zweite, nach der auch verschiedenen Längenklassen der Heringe homogen verteilt sind. Die Proben, die Mitte April an drei verschiedenen Stationen im Greifswalder Bodden genommen wurden, zeigten signifikante Unterschiede der Larvenabundanzen allgemein zwischen den beprobten Tiefenstufen als auch der Längenklassen zwischen den Tiefenstufen, sodass beide Nullhypothesen abzulehnen sind. Eine homogene Verteilung der Heringslarven kann ausgeschlossen werden. Abstract Larvae of the Western Baltic Spring Spawning Herring were sampled in the Greifswalder Bodden in the course of a Bachelor Thesis to investigate whether they are inhomogeneously vertically distributed. Previous research assumed homogeneous vertical distribution because of the shallowness of the Greifswalder Bodden due to hydrographical mixing of the water and the ichthyoplankton. Two null hypotheses were tested, one which presumes even vertical distribution of the herring larvae and another which presumes even vertical distribution within different length classes in the Greifswalder Bodden. Sampling took place at three different stations in the Greifswalder Bodden during April and results showed significant differences of the larvae abundances between the sampled depths and also significant differences of the length classes between the sampled depths. Therefore both null hypotheses can be rejected and a homogeneous vertical distribution of the herring larvae in the Greifswalder Bodden can be excluded.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 2
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    In:  [Talk] In: European Marine Biology Symposium 2015 (EMBS 50), 21.-25.09.2015, Helgoland, Germany .
    Publication Date: 2016-02-24
    Description: Many commercial pelagic fishes such as Atlantic herring run through a life cycle which is tightly bound to the offshore pelagic zones. Their population dynamics are therefore mainly driven by large scale hydrography or climate conditions and studies on early life-stages are usually focused on outer shelf bank spawning grounds and adjacent areas. However, larval herring of East-Atlantic sub-populations spawned within estuarine inshore systems develop in a quite different suite of environmental conditions than their shelf-spawned conspecifics in the neighboring North Sea. Hypothesizing that herring larvae in shallow brackish lagoons utilize different estuarine habitats along their early ontogenesis we sampled ichthyoplankton at distinct pelagic and littoral sites within a major spawning area of the Western Baltic herring. Additionally, we analyzed the vertical distribution of herring larvae which is generally assumed to reflect the well mixed condition of shallow waters in the lagoon. Samples in the littoral zone unexpectedly contained comparably high numbers of herring larvae as samples taken at the pelagic sites. Furthermore we observed high abundances of older flexion larvae in very shallow areas (〈1m) close to the shore line. Despite a well-mixed water column, herring larvae showed a distinct vertical distribution indicating an active depth selection potentially influencing the drift potential along the current regimes. Our study underlines the importance of shallow littoral zones for the reproduction success of pelagic key stone species. Future discussions on management and protection demands should take into account the significant function of these habitats for larval fish.
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 3
    Publication Date: 2016-02-24
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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