Lake water level increase during spring affects the breeding success of bream Abramis brama (L.)

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Hydrobiol_Probstetal_2009_KOPS.pdf
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2009
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Probst, Wolfgang Nikolaus
Peters, Lars
Fischer, Philipp
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To be publ in:Hydrobiologia. 2009, 632(1), pp. 211-224. ISSN 0018-8158. eISSN 1573-5117. Available under: doi: 10.1007/s10750-009-9842-5
Zusammenfassung

In Lake Constance, Eurasian bream Abramis brama (L.) spawn in very shallow littoral areas by the beginning of May. They attach their adhesive eggs to pebble and cobble substratum at 40 cm depth. Increasing water levels before spawning inundate bare substratum to which bream eggs may attach better than to deeper substratum covered by epilithon. Consequently, the water level increase prior to spawning should determine the amount of pristine spawning substratum available to bream and thus influence their breeding success. In order to test this hypothesis, the influence of hydrology and climate on the abundance of age-0 bream was combined with the results from field investigations on the egg survival and abundance of age-0 bream. A strong positive correlation between the mean water level increase during the spawning season of bream (April May) and the abundance of juvenile bream was found. In contrast, the absolute water level during spawning and during the nursery stage in summer, the cumulative temperature during the egg, larval and juvenile stages and two North Atlantic Oscillation (NAO) indices did not affect the abundance of juvenile bream. The field investigations confirmed that bream eggs attach better to and have higher survival rates on bare substratum than on substratum with epilithon cover. Accordingly, eggs within a spawning habitat of bream were most abundant between 10 and 20 cm depth, where the epilithon cover was lower than at depths exceeding 30 cm. The results of this study confirm an adverse influence of epilithon cover on the attachment and subsequent survival of bream eggs and emphasize the importance of spring inundations for the successful breeding of the bream.

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Fachgebiet (DDC)
590 Tiere (Zoologie)
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Hydrologie, Bodensee, Spawning substratum, hydrology, cyprinids, Lake Constance, climate, breeding
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ISO 690PROBST, Wolfgang Nikolaus, Stefan STOLL, Lars PETERS, Philipp FISCHER, Reiner ECKMANN, 2009. Lake water level increase during spring affects the breeding success of bream Abramis brama (L.). In: To be publ in:Hydrobiologia. 2009, 632(1), pp. 211-224. ISSN 0018-8158. eISSN 1573-5117. Available under: doi: 10.1007/s10750-009-9842-5
BibTex
@article{Probst2009water-7844,
  year={2009},
  doi={10.1007/s10750-009-9842-5},
  title={Lake water level increase during spring affects the breeding success of bream Abramis brama (L.)},
  number={1},
  volume={632},
  issn={0018-8158},
  journal={To be publ  in:Hydrobiologia},
  pages={211--224},
  author={Probst, Wolfgang Nikolaus and Stoll, Stefan and Peters, Lars and Fischer, Philipp and Eckmann, Reiner}
}
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    <dcterms:abstract xml:lang="eng">In Lake Constance, Eurasian bream Abramis brama (L.) spawn in very shallow littoral areas by the beginning of May. They attach their adhesive eggs to pebble and cobble substratum at 40 cm depth. Increasing water levels before spawning inundate bare substratum to which bream eggs may attach better than to deeper substratum covered by epilithon. Consequently, the water level increase prior to spawning should determine the amount of pristine spawning substratum available to bream and thus influence their breeding success. In order to test this hypothesis, the influence of hydrology and climate on the abundance of age-0 bream was combined with the results from field investigations on the egg survival and abundance of age-0 bream. A strong positive correlation between the mean water level increase during the spawning season of bream (April May) and the abundance of juvenile bream was found. In contrast, the absolute water level during spawning and during the nursery stage in summer, the cumulative temperature during the egg, larval and juvenile stages and two North Atlantic Oscillation (NAO) indices did not affect the abundance of juvenile bream. The field investigations confirmed that bream eggs attach better to and have higher survival rates on bare substratum than on substratum with epilithon cover. Accordingly, eggs within a spawning habitat of bream were most abundant between 10 and 20 cm depth, where the epilithon cover was lower than at depths exceeding 30 cm. The results of this study confirm an adverse influence of epilithon cover on the attachment and subsequent survival of bream eggs and emphasize the importance of spring inundations for the successful breeding of the bream.</dcterms:abstract>
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