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Folders: ROOT > ScienceBase Catalog > LC MAP - Landscape Conservation Management and Analysis Portal > Great Plains Landscape Conservation Cooperative > Projects > FY 2011 Science Research Projects > Evaluating the reproductive success of Arkansas River shiner by evaluating early life-history stage dispersal and survival at a landscape level ( Show direct descendants )
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ROOT _ScienceBase Catalog __LC MAP - Landscape Conservation Management and Analysis Portal ___Great Plains Landscape Conservation Cooperative ____Projects _____FY 2011 Science Research Projects ______Evaluating the reproductive success of Arkansas River shiner by evaluating early life-history stage dispersal and survival at a landscape level Filters
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Habitat fragmentation and flow regulation are significant factors related to the decline and extinction of freshwater biota. Pelagic-broadcast spawning cyprinids require moving water and some length of unfragmented stream to complete their life cycle. However, it is unknown how discharge and habitat features interact at multiple spatial scales to alter the transport of semi-buoyant fish eggs. Our objective was to assess the relationship between downstream drift of semi-buoyant egg surrogates (gellan beads) and discharge and habitat complexity. We quantified transport time of a known quantity of beads using 2–3 sampling devices at each of seven locations on the North Canadian and Canadian rivers. Transport time was...
Quantitative studies focusing on the collection of semibuoyant fish eggs, which are associated with a pelagic broadcast-spawning reproductive strategy, are often conducted to evaluate reproductive success. Many of the fishes in this reproductive guild have suffered significant reductions in range and abundance. However, the efficiency of the sampling gear used to evaluate reproduction is often unknown and renders interpretation of the data from these studies difficult. Our objective was to assess the efficiency of a modified Moore egg collector (MEC) using field and laboratory trials. Gear efficiency was assessed by releasing a known quantity of gellan beads with a specific gravity similar to that of eggs from representatives...
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