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- W4200592830 abstract "Abstract Aquatic ecosystems around the world exist on a continuum between turbid, algal‐dominated conditions and clear, macrophyte‐dominated conditions, which may influence population dynamics of fish in these systems (such as Yellow Perch Perca flavescens ). Since turbidity influences the amount of light penetration and occurrence of vegetation, spawning and nursery habitat, as well as food availability, may change depending on lake condition. For example, a decrease in turbidity encourages a shift in the prevalent zooplankton taxa from Bosmina spp. to Daphnia spp. We hypothesized that many factors associated with a condition shift may combine to influence Yellow Perch, including increased abundance and therefore increased intraspecific competition, resulting in a reduced length and body condition. We used long‐term monitoring data from Lake Shaokatan, Minnesota, to examine whether a rarely documented condition shift from a turbid, algal‐dominated condition to a clear, macrophyte‐dominated condition occurred in 2014 and whether that shift influenced population dynamics of Yellow Perch, including relative abundance (gill‐net CPUE), mean total length, and mean relative weight. A condition shift from turbid to clear was determined in 2014 using mixed‐effects models that showed significant decreases in phosphorous and chlorophyll a concentration, as well as an increase from a mean of 22% to over 90% vegetation occurrence. The zooplankton community qualitatively showed a prevalence of Daphnia spp. and cyclopoids over small cladocerans during the clear condition period until 2018. Mixed‐effect models were also used to determine that the shift to a clear condition resulted in a significant decrease in Yellow Perch mean total length and relative weight. Therefore, the condition shift and resulting habitat changes that occurred in 2014 and later influenced the size and condition of Yellow Perch. Continued monitoring may overcome variability in relative abundance and help elucidate emerging trends." @default.
- W4200592830 created "2021-12-31" @default.
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- W4200592830 date "2021-12-22" @default.
- W4200592830 modified "2023-10-18" @default.
- W4200592830 title "Effects of a Shallow Lake Condition Shift on Habitat, Zooplankton, and Yellow Perch Dynamics" @default.
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- W4200592830 doi "https://doi.org/10.1002/nafm.10720" @default.
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