Depth Distributions of Armored Catfish: Predator-Induced Resource Avoidance?

作者: Mary E. Power

DOI: 10.2307/1941414

关键词: CatfishEcologyHabitatWaves and shallow waterBiologyAncistrusWet seasonLoricariidaeDry seasonPredation

摘要: Four species of armored catfish (Loricariidae) have size-specific depth distributions in a Panamanian stream, with larger fish deeper water. Depth do not change from the dry to rainy season, despite two- three-fold increase habitat area for loricariids. Throughout year, standing crops loricariids' attached algal food are relatively high shallow water, but decrease rapidly depth. Over 21/2 yr, large Ancistrus spinosus, most common pool- dwelling loricariid, showed significant seasonal changes somatic growth rates, maximum rates early season and minimum late season. Significant mortality estimated disappearance marked individuals, were detected. These data consistent following hypothesis: small loricariids limited, perhaps by predation, at densities below those necessary deplete algae Larger avoid water where they vulnerable fishing birds, even when is short supply areas.

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