Title
Papyrus swamps, hypoxia, and faunal diversification: Variation among populations of Barbus neumayeri
Author(s)
Chapman, L.J.; Chapman, C.A.; Brazeau, D.A.; McLaughlin, B.; Jordan, M.
Published
1999
Publisher
Journal of Fish Biology
Abstract
To test whether patches of papyrus swamp contribute to diversification of populations of non-air-breathing fishes, the gill morphology of Barbus neumayeri was compared between a papyrus swamp and several tributaries which differed in oxygen regime. Total gill filament length differed among sites and was negatively related to dissolved oxygen availability, supporting strong selection pressure for low-oxygen tolerance in the swamp interior. Among recaptures of marked B neumayeri over a 4-5-year period among the focal swamp and connected stream and river sites, 93% of fish were recovered at the site of capture. Some of the individuals that moved crossed physicochemical gradients and traversed long distances within the swamp/stream system. This movement rate would theoretically be sufficient to homogenize gene frequencies among populations. However, randomly amplified polymorphic DNA (RAPD) markers indicated significant genetic differentiation among sites and no relationship between genetic differences and geographical distances among sites suggesting habitat-specific selection pressures on dispersers, rather than insufficient dispersal.
Keywords
environmental impact; intraspecific variation; oxygen; population characteristics; swamp; Barbus neumayeri; AQUATIC SURFACE RESPIRATION; PHENOTYPIC PLASTICITY; GEOPHAGUS-BRASILIENSIS; ENDANGERED FISHES; DISSOLVED-OXYGEN; BODY SHAPE; ECOLOGY; REFUGIA; PISCES; CICHLIDAE
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PUB12820