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- W1996787434 abstract "We used a combination of field experiments and stable isotopes to examine mummichog growth and movement within a New England estuary. We documented physical and biological patterns within the estuary by caging individually-marked fish in enclosures at four locations along a coastal river and measuring environmental parameters (e.g., salinity, tidal inundation) and fish characteristics (e.g., gut-contents, growth, and stable isotope values) at each location. The upstream location was fresh (1 ppt) at low tide, and the downstream location was saline at high tide (32 ppt). The upstream and downstream locations had more tidal inundation than the intermediate location. Fish gut contents were dominated by terrestrial insects at the upstream location, by algae and detritus at the intermediate locations, and by aquatic insects at the downstream location. Fish grew fastest at the upstream location and slowest at the downstream location. Stable isotope values (δ13C and δ15N) of fish held in cages were significantly different at upstream, intermediate, and downstream locations. We transferred fish from one location to another in order to document how stable isotope values change when fish switch diets by moving within this estuary. Because differences in rates at which different tissue types approach the isotopic value of new diet sources can be used as a way to estimate the time since diet shift, we used the δ13C and δ15N values of liver and muscle as indicators of short term previous diet (liver) and longer term previous diet (muscle). We collected wild (uncaged) mummichogs from each location, and we compared their liver and muscle isotope values to values of fish that were transferred among locations. When fish were transferred from one location to another, their stable isotope values were intermediate between expected values at the previous and current locations. The liver approached stable isotope values representative of current location faster than muscle. Wild fish showed greater variation in stable isotope values than fish held in cages. Wild fish from the upstream location showed patterns in liver and muscle stable isotope values that were consistent with patterns in fish that were transferred from the downstream location to the upstream location (∼ 10 km away). These patterns in stable isotope values could have multiple causes including intra-season movement between downstream and upstream locations." @default.
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- W1996787434 date "2009-02-01" @default.
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- W1996787434 title "Examining mummichog growth and movement: Are some individuals making intra-season migrations to optimize growth?" @default.
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- W1996787434 doi "https://doi.org/10.1016/j.jembe.2008.09.027" @default.
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