Anuran Larval Habitat Quality When Reed Canary Grass Is Present in Wetlands

Abstract

Abstract Ephemeral, fishless wetlands with open canopies are known to be quality breeding habitats for pond-breeding amphibians. Yet many wetlands including these are commonly invaded by exotic plants, resulting in vegetation shifts from diverse native vegetation to monotypic stands of novel material. I tested the hypothesis that an invasive grass, reed canary grass (Phalaris arundinacea), would reduce survival, growth, and development rates of four tadpole species relative to a mixture of native grasses. I manipulated grass type and amount in fully replicated mesocosm experiments that contained American Toads (Anaxyrus americanus), Cope's Gray Treefrogs (Hyla chrysoscelis), Pickerel Frogs (Lithobates palustris), or Wood Frogs (Lithobates sylvatica). Counter to expectations, I found little evidence that diverse vegetation enhanced wetland quality for amphibians, because the quantity of decomposing plant matter influenced tadpole performance more than type of plant matter. Growth and development of tadpole...