Diel diet shift of roach and its implications for the estimation of daily rations

Haertel, Susanne S.; Eckmann, Reiner

Diel diet shift of roach and its implications for the estimation of daily rations

Dateien

Haertel_Eckmann_JFishBiol_2002.pdfGröße: 162.31 KBDownloads: 350

Datum

2002

Autor:innen

Haertel, Susanne S.

Eckmann, Reiner

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of Fish Biology. 2002, 60(4), pp. 1-17. ISSN 0022-1112. eISSN 1095-8649. Available under: doi: 10.1111/j.1095-8649.2002.tb02415.x

Zusammenfassung

In a small, 12 ha, mesotropic lake, roach Rutilus rutilus performed diel habitat shifts that clearly influenced the composition of their diet. During daytime, roach stayed in the littoral zone and concentrated on littoral prey. At night they were found in the pelagic zone, and pelagic prey items such as Daphnia spp. or Chaoborus flavicans dominated their food. On a seasonal scale, there were shifts in the importance of different food items and in the diel pattern of feeding intensity. Bioenergetics modelling in combination with an evacuation rate method for estimating daily rations allowed for changes in feeding modes to be taken into account, and so food item specific daily rations over the season could be determined. With the evacuation rate method applied on selected days,determined over the entire sampling season. The consideration of the diel diet shifts proved to be essential for the model output. If only the daytime or the night-time diet composition (derived from one single daily sampling) was taken into account for bioenergetics modelling, severe under- or overestimations of daily rations for specific food items resulted.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

diel diet shift, daily ration, bioenergetics modelling, roach, Rutilus rutilus

Zitieren

ISO 690

HAERTEL, Susanne S., Reiner ECKMANN, 2002. Diel diet shift of roach and its implications for the estimation of daily rations. In: Journal of Fish Biology. 2002, 60(4), pp. 1-17. ISSN 0022-1112. eISSN 1095-8649. Available under: doi: 10.1111/j.1095-8649.2002.tb02415.x

BibTex

@article{Haertel2002shift-6575,
  year={2002},
  doi={10.1111/j.1095-8649.2002.tb02415.x},
  title={Diel diet shift of roach and its implications for the estimation of daily rations},
  number={4},
  volume={60},
  issn={0022-1112},
  journal={Journal of Fish Biology},
  pages={1--17},
  author={Haertel, Susanne S. and Eckmann, Reiner}
}

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    <dcterms:abstract xml:lang="eng">In a small, 12 ha, mesotropic lake, roach Rutilus rutilus performed diel habitat shifts that clearly influenced the composition of their diet. During daytime, roach stayed in the littoral zone and concentrated on littoral prey. At night they were found in the pelagic zone, and pelagic prey items such as Daphnia spp. or Chaoborus flavicans dominated their food. On a seasonal scale, there were shifts in the importance of different food items and in the diel pattern of feeding intensity. Bioenergetics modelling in combination with an evacuation rate method for estimating daily rations allowed for changes in feeding modes to be taken into account, and so food item specific daily rations over the season could be determined. With the evacuation rate method applied on selected days,determined over the entire sampling season. The consideration of the diel diet shifts proved to be essential for the model output. If only the daytime or the night-time diet composition (derived from one single daily sampling) was taken into account for bioenergetics modelling, severe under- or overestimations of daily rations for specific food items resulted.</dcterms:abstract>
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