Assemblage structure and habitat use of fishes in a Central European submontane stream: a patch‐based approach
Identifieur interne : 000A92 ( Main/Exploration ); précédent : 000A91; suivant : 000A93Assemblage structure and habitat use of fishes in a Central European submontane stream: a patch‐based approach
Auteurs : T. Er S ; Z. Botta-Dukát ; G. D. Grossman [États-Unis]Source :
- Ecology of Freshwater Fish [ 0906-6691 ] ; 2003-06.
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Abstract
Abstract – We examined macrohabitat patch level assemblage composition and habitat use patterns of fishes over four seasons in a second‐order submontane stream (Danube drainage, Hungary). Rainfall data indicated that our study included both high‐ and low‐water periods, and hence our results may be applicable to broader time scales. Principal component analysis of physical habitat data from 13 macrohabitat patches indicated that these patches represented a riffle‐pool continuum. Correspondence analysis of fish assemblage structure data from these patches identified a continuum in assemblage composition that was positively correlated with the habitat continuum. The riffle fauna was dominated by stone loach (Barbatula barbatula), whereas chub (Leuciscus cephalus) were most abundant in pool patches. We detected little evidence of seasonality in either fish assemblage structure or habitat use. Fish density did not differ significantly among macrohabitat patches in two (summer and autumn 1999) of three seasonal samples, although riffle patches displayed significantly higher fish abundance in late spring 2000. This difference primarily was due to higher abundance of juvenile stone loach in riffles. Two species, stone loach and minnow (Phoxinus phoxinus), displayed generalized habitat use patterns, whereas chub and rare species (i.e., gudgeon, Gobio gobio; dace, Leuciscus leuciscus; Barbus petenyi; and burbot, Lota lota) were significantly over‐represented in pool habitats. We hypothesized that pool specialists (i.e., chub and rare species) were responding primarily to the increased depth of these habitats. Nevertheless, our data did not demonstrate the presence of separate pool and riffle habitat guilds. In conclusion, we believe that our understanding of stream fish ecology will be greatly facilitated by use of a ‘patch‐based approach’.
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DOI: 10.1034/j.1600-0633.2003.00009.x
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Rainfall data indicated that our study included both high‐ and low‐water periods, and hence our results may be applicable to broader time scales. Principal component analysis of physical habitat data from 13 macrohabitat patches indicated that these patches represented a riffle‐pool continuum. Correspondence analysis of fish assemblage structure data from these patches identified a continuum in assemblage composition that was positively correlated with the habitat continuum. The riffle fauna was dominated by stone loach (Barbatula barbatula), whereas chub (Leuciscus cephalus) were most abundant in pool patches. We detected little evidence of seasonality in either fish assemblage structure or habitat use. Fish density did not differ significantly among macrohabitat patches in two (summer and autumn 1999) of three seasonal samples, although riffle patches displayed significantly higher fish abundance in late spring 2000. This difference primarily was due to higher abundance of juvenile stone loach in riffles. Two species, stone loach and minnow (Phoxinus phoxinus), displayed generalized habitat use patterns, whereas chub and rare species (i.e., gudgeon, Gobio gobio; dace, Leuciscus leuciscus; Barbus petenyi; and burbot, Lota lota) were significantly over‐represented in pool habitats. We hypothesized that pool specialists (i.e., chub and rare species) were responding primarily to the increased depth of these habitats. Nevertheless, our data did not demonstrate the presence of separate pool and riffle habitat guilds. In conclusion, we believe that our understanding of stream fish ecology will be greatly facilitated by use of a ‘patch‐based approach’.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Géorgie (États-Unis)</li></region></list><tree><noCountry><name sortKey="Botta Ukat, Z" sort="Botta Ukat, Z" uniqKey="Botta Ukat Z" first="Z." last="Botta-Dukát">Z. 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