We marked 1514 individuals from 23 anuran species, and found that richness in ponds ranged from 314 species. Key Words Seasonal pond Vernal pool Ephemeral wetland Remote sensing Forest harvest Indicator species. Keywords: competition, ecosystem function, Limnodynastes, macroinvertebrates, Ochlerotatus, rainfall. We sampled 11 ephemeral ponds in a pasture matrix near a large Atlantic Forest remnant in Brazil and measured local and landscape variables inside two buffer zones around each pond (100 and 500 m). Marine & Freshwater Research CSIRO Publishing Tadpoles and mosquito larvae might influence the development of the dominant pond state through preferential consumption of edible phytoplankton and bacteria, reducing the competitive pressure on relatively inedible metaphyton, which forms dominating mats. The negative effect of tadpoles on invertebrate abundance may result from competition for food or space, while complementary tadpole and mosquito effects on ecosystem processes are likely to result from changes in the dominant pond state.
These are the here-today-gone-tomorrow ponds, the gather-ye-rosebuds-while-ye-may wetlands. The addition of both tadpoles and mosquito larvae also increased ecosystem productivity. Ephemeral ponds are (most years) just thatephemeral (they’re also called vernal or spring ponds, but because some hold water in fall instead of spring, ephemeral is a more inclusive term). However, there were negative effects of tadpole addition on other invertebrates, with decreases in the abundance of zooplankton ( Moina australiensis ) and dipterans (Ephydridae and Chironomus oppositus ). Although successful establishment decreased with experimental time, there was no evidence that interactions between tadpoles and mosquitoes decreased the other species' subsequent survival. Here, I report the results of a field-based aquatic microcosm experiment, where the timing of arrival and abundance of two herbivores, tadpoles ( Limnodynastes tasmaniensis ) and mosquito larvae ( Ochlerotatus notoscriptus ), were manipulated to determine their impact on invertebrate community structure and ecosystem processes. Hydroperiods range widely from as few as 50 days or less to more than 200 days per year. They occur as isolated wetlands within larger upland ecosystems. Typically small shallow, usually rounded depression in sand substrate with herbaceous vegetation often in concentric bands. Impact of tadpoles and mosquito larvae on ephemeral pond structure and processes Impact of tadpoles and mosquito larvae on ephemeral pond structure and processesĬompetition between organisms can influence both the abundance of species and the function of ecosystems. Ephemeral ponds and wetlands are wet only seasonally or in wet years. On Saturday, 25 March, I led a field trip, Ephemeral Ponds in the North Carolina Sandhills, as a follow-up to my talk on ephemeral wetlands at the 14.
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