Effects of water-level fluctuations on the littoral benthic fish community in lakes: a mesocosm experiment
Identifieur interne : 000947 ( Main/Exploration ); précédent : 000946; suivant : 000948Effects of water-level fluctuations on the littoral benthic fish community in lakes: a mesocosm experiment
Auteurs : Philipp Fischer [Allemagne] ; Uta O Hl [Allemagne]Source :
- Behavioral Ecology [ 1045-2249 ] ; 2005-NaN.
English descriptors
- KwdEn :
Abstract
Changes in the water level of lakes, either natural or man-made, are important environmental perturbations for eulittoral benthic fish communities. In outdoor mesocosm experiments, we tested the effects of decreasing shelter availability due to autumn lake-level decrease on the behavior and the growth of two littoral benthic dwellers, the juvenile burbot and the stone loach. The two species showed significantly different changes in behavior when shelter availability decreased. Burbot built up a distinct hierarchy when shelter became sparse, with larger fish being significantly more successful in competing for suitable shelter than smaller conspecifics. The hierarchy, however, ceased when shelter availability decreased below a certain level. The largest fish then increasingly abandoned shelter use, while smaller fish persisted with their sheltering behavior. Stone loach, in contrast, showed no hierarchical order or size-related shelter use. Only burbot showed a significant relationship between the ability to occupy the preferred shelter and the somatic growth. These two species provide an example of different strategies to deal with environmental perturbations like lake-level decrease, with the stenoecious, dominant strategy of the burbot and the euryoecious, evasive strategy of stone loach. The results demonstrate the importance of conducting behavioral studies under as natural conditions as possible.
Url:
DOI: 10.1093/beheco/ari047
Affiliations:
- Allemagne
- Bade-Wurtemberg, District de Fribourg-en-Brisgau
- Constance (Allemagne)
- Université de Constance
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In outdoor mesocosm experiments, we tested the effects of decreasing shelter availability due to autumn lake-level decrease on the behavior and the growth of two littoral benthic dwellers, the juvenile burbot and the stone loach. The two species showed significantly different changes in behavior when shelter availability decreased. Burbot built up a distinct hierarchy when shelter became sparse, with larger fish being significantly more successful in competing for suitable shelter than smaller conspecifics. The hierarchy, however, ceased when shelter availability decreased below a certain level. The largest fish then increasingly abandoned shelter use, while smaller fish persisted with their sheltering behavior. Stone loach, in contrast, showed no hierarchical order or size-related shelter use. Only burbot showed a significant relationship between the ability to occupy the preferred shelter and the somatic growth. These two species provide an example of different strategies to deal with environmental perturbations like lake-level decrease, with the stenoecious, dominant strategy of the burbot and the euryoecious, evasive strategy of stone loach. The results demonstrate the importance of conducting behavioral studies under as natural conditions as possible.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Bade-Wurtemberg</li><li>District de Fribourg-en-Brisgau</li></region><settlement><li>Constance (Allemagne)</li></settlement><orgName><li>Université de Constance</li></orgName></list><tree><country name="Allemagne"><region name="Bade-Wurtemberg"><name sortKey="Fischer, Philipp" sort="Fischer, Philipp" uniqKey="Fischer P" first="Philipp" last="Fischer">Philipp Fischer</name></region><name sortKey="O Hl, Uta" sort="O Hl, Uta" uniqKey="O Hl U" first="Uta" last="O Hl">Uta O Hl</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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