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Role of aquatic vegetation coverage on hypoxia and sunfish abundance in bays of a eutrophic reservoir

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Abstract

We studied the relation between aquatic vegetation coverage, summer dissolved oxygen and density of sunfishes (Lepomis spp.) in 10 shallow bays of a eutrophic reservoir. The bays ranged 5.2–15.7 ha in area, 0.6–1.3 m mean depth and 6–91% vegetation area coverage. Over the 10 bays mean dissolved oxygen concentration ranged 5.8–9.0 mg l-1 in open water at least 20 m away from the vegetation, 0.8–8.1 mg l-1 at the vegetation-water edge and 0.5–7.7 mg l-1 in dense vegetation. Dissolved oxygen concentrations were inversely related to vegetation coverage. In open water, dissolved oxygen levels were consistently higher than 8 mg l-1 when vegetation coverage was <20% of the bay and decreased to about 6 mg l-1 at coverages near 80%. At the vegetation-water edge and within dense vegetation, dissolved oxygen levels dropped rapidly as vegetation coverage increased to 20% of the bay; when vegetation reached about 50% coverage, dissolved oxygen remained near 1.5 mg l-1at the vegetation-water edge, but oxygen dropped below 1 mg l-1in dense vegetation. Scarce vegetation harbored high Lepomis relative abundance (fish per m2 of vegetation) whereas extensive vegetation harbored low relative abundance, both contributing little to absolute abundance (total fish in all vegetation); however, intermediate coverage offered a combination of mid-level fish relative abundance that together with mid-level plant coverage translated into high absolute fish abundance. We suggest this response is related to hypoxia, and where aquatic vegetation is extensive, the effect of vegetation on hypoxia and water quality in general may influence fish populations in a way similar to that often attributed to reduced foraging efficiency and increased competitive interactions.

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Miranda, L.E., Hodges, K.B. Role of aquatic vegetation coverage on hypoxia and sunfish abundance in bays of a eutrophic reservoir. Hydrobiologia 427, 51–57 (2000). https://doi.org/10.1023/A:1003999929094

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