VARIABLE GIZZARD SHAD RECRUITMENT WITH RESERVOIR PRODUCTIVITY: CAUSES AND IMPLICATIONS FOR CLASSIFYING SYSTEMS
نویسندگان
چکیده
منابع مشابه
Food Consumption by Larval Gizzard Shad: Zooplankton Effects and Implications for Reservoir Communities
—Because peak abundance of larval gizzard shad Dorosoma cepedianum occurs simultaneously with the midsummer decline of macrozooplankton in Ohio reservoirs, we hypothesized that zooplanktivory by larval gizzard shad caused this decline. To test this hypothesis, we compared larval food consumption with zooplankton productivity in two reservoirs. Larval gizzard shad began to influence zooplankton ...
متن کاملNitrogen and phosphorus excretion by detritivorous gizzard shad in a reservoir ecosystem
The detritivorous fish, gizzard shad (Dorosoma cepedianum), provides nutrients to phytoplankton in reservoirs by ingesting organic detritus associated with sediments and excreting substantial quantities of nutrients such as N and P in soluble forms that are highly available to phytoplankton, We estimated nutrient excretion by gizzard shad in a eutrophic reservoir (Acton Lake, Ohio) during April...
متن کاملBiomass-Dependent Diet Shifts in Omnivorous Gizzard Shad: Implications for Growth, Food Web, and Ecosystem Effects
—We examined diet patterns of omnivorous gizzard shad Dorosoma cepedianum in Acton Lake, Ohio, during 1994–1997 using a multiple stable isotope analysis to quantify the role of this species in the system. On most dates, zooplankton were relatively depleted in d13C (about 230‰ to 225.5‰) compared with sediments (225‰), permitting construction of a mixing model to determine the proportion of C de...
متن کاملEffects of gizzard shad on benthic communities in reservoirs
Effects of gizzard shad Dorosoma cepedianum on benthic communities in a large southern reservoir (Lake Texoma, U.S.A.) were examined during two field enclosure and exclosure experiments in which enclosures were stocked at high and low densities in 1998 and 1999, respectively. In both years, chironomid abundance significantly increased in treatments that excluded large fishes from foraging on se...
متن کاملNutrient cycling by fish supports relatively more primary production as lake productivity increases.
Animals can be important in nutrient cycling in particular ecosystems, but few studies have examined how this importance varies along environmental gradients. In this study we quantified the nutrient cycling role of an abundant detritivorous fish species, the gizzard shad (Dorosoma cepedianum), in reservoir ecosystems along a gradient of ecosystem productivity. Gizzard shad feed mostly on sedim...
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ژورنال
عنوان ژورنال: Ecological Applications
سال: 2001
ISSN: 1051-0761
DOI: 10.1890/1051-0761(2001)011[1425:vgsrwr]2.0.co;2