Present study established correlations between the spatial distribution of three stream-dwelling fish species (chub, stone loach and gudgeon), the environmental variables which affect their distribution, and the genetic structure of their assemblages, in a North Hungarian drainage system. The spatial distribution of gudgeon and stone loach (which have more specific habitat needs) was affected by elevation, slope and distance from the mouth. Chub occurred frequently in the wider and deeper streams of the hills with higher velocity, but was repeatedly caught in lowland situated sections close to the mouth as well. Genetic data obtained with AFLP were correlated with distribution and as a result higher genetic distances were revealed among gudgeon and stone loach than among chub assemblages. The assemblages of the former two species show a clear pattern of isolation by distance. Results suggest that lowland sections of the studied streams might act as ecological barriers for stone loach and gudgeon assemblages, but not for the chub. Hence, in this drainage system the stone loach and gudgeon appear with separated populations while the chub is characterized by a metapopulation structure.
|Number of pages||15|
|Journal||Acta Zoologica Academiae Scientiarum Hungaricae|
|Publication status||Published - Jan 1 2008|
- Isolation by distance
- Stone loach
ASJC Scopus subject areas
- Animal Science and Zoology