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13 results for “bluegill”
Minnesota Department of Natural Resources Yellow Perch and Bluegill Diet Study, Lower Pool 4 Mississippi River, 2018-2019
To assess potential dietary overlap and predation between bluegill and yellow perch, we examined stomach content of both species in three backwater contiguous lakes of Lower Pool 4 in the Mississippi River from May 2018 through January 2019. In this area, bluegill have been common for decades, but yellow perch only became abundant following an ecological shift to a clear-water, macrophyte dominated state that occurred from 2007 - 2007. We used daytime electrofishing to collect fish during open-water sampling (spring, summer, and fall) and ice angling during ice-covered sampling (winter). The dataset documents the diet content of one hundred and eighty-nine yellow perch and sixty-one bluegill. Stomach contents were extracted via gastric lavage in the spring, summer, and fall and via stomach removal in the winter. All prey items were categorized to lowest identifiable taxonomic level and quantified via volumetric displacement.
Androgen and prolactin manipulation do not induce changes in gene expression in the telencephalon in parental male bluegill (Lepomis macrochirus) during parental care
<p>Transcriptome of the prosencephalon of 11-KT, prolactin and placebo implanted fish.</p>
Data from: Brain transcriptional profiles of male alternative reproductive tactics and females in bluegill sunfish
Bluegill sunfish (Lepomis macrochirus) are one of the classic systems for studying male alternative reproductive tactics (ARTs) in teleost fishes. In this species, there are two distinct life histories: parental and cuckolder, encompassing three reproductive tactics, parental, satellite, and sneaker. The parental life history is fixed, whereas individuals who enter the cuckolder life history transition from sneaker to satellite tactic as they grow. For this study, we used RNAseq to characterize the brain transcriptome of the three male tactics and females during spawning to identify gene ontology (GO) categories and potential candidate genes associated with each tactic. We found that sneaker males had higher levels of gene expression differentiation compared to the other two male tactics. Sneaker males also had higher expression in ionotropic glutamate receptor genes, specifically AMPA receptors, compared to other males, which may be important for increased spatial working memory while attempting to cuckold parental males at their nests. Larger differences in gene expression also occurred among male tactics than between males and females. We found significant expression differences in several candidate genes that were previously identified in other species with ARTs and suggest a previously undescribed role for cAMP-responsive element modulator (crem) in influencing parental male behaviors during spawning.
Figure 5 in Spatial distribution of Neoergasilus japonicus (Copepoda: Ergasilidae) on the fins of bluegill (Lepomis macrochirus)
Figure 5. Minimum distances of individuals between Neoergasilus japonicus on the left (A) and right (B) sides in the soft ray area of the dorsal fin of Lepomis macrochirus. Dots show the positions of copepods, and 30 and 35 minimum distances were measured.
Figure 4 in Spatial distribution of Neoergasilus japonicus (Copepoda: Ergasilidae) on the fins of bluegill (Lepomis macrochirus)
Figure 4. Available areas (= Thiessen polygons) for individuals of Neoergasilus japonicus on the left (A) and right (B) sides in the soft ray area of the dorsal fin of Lepomis macrochirus. Dots show the positions of copepods, and the available areas were measured for 23 and 25 polygons on the left and right sides, respectively.
Figure 3 in Spatial distribution of Neoergasilus japonicus (Copepoda: Ergasilidae) on the fins of bluegill (Lepomis macrochirus)
Figure 3. Proportion of occurrence of Neoergasilus japonicus on various sections of the dorsal (A) and anal (B) fins of Lepomis macrochirus at different numbers of copepods (1–10, 11–20, 21–30 and> 31 in the dorsal fin; 1–5, 6–10, 11–15 and> 16 in the anal fin). The number of L. macrochirus examined is shown in parentheses.
Figure 2 in Spatial distribution of Neoergasilus japonicus (Copepoda: Ergasilidae) on the fins of bluegill (Lepomis macrochirus)
Figure 2. Number of Neoergasilus japonicus on various sections of the dorsal (A) and anal (B) fins of Lepomis macrochirus.
Data from: Brain transcriptional profiles of male alternative reproductive tactics and females in bluegill sunfish
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Interactions between non-native Western Mosquitofish and native Bluegill Sunfish: mesocosm experiments
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Kinematic integration during prey capture varies among individuals but not ecological contexts in bluegill sunfish, Lepomis macrochirus (Perciformes: Centrarchidae)
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Data from: Intraspecific phenotypic variation among alewife populations drives parallel phenotypic shifts in bluegill
Evolutionary diversification within consumer species may generate selection on local ecological communities, affecting prey community structure. However, the extent to which this niche construction can propagate across food webs and shape trait variation in competing species is unknown. Here, we tested whether niche construction by different life-history variants of the planktivorous fish alewife (Alosa pseudoharengus) can drive phenotypic divergence and resource use in the competing species bluegill (Lepomis macrochirus). Using a combination of common garden experiments and a comparative field study, we found that bluegill from landlocked alewife lakes grew relatively better when fed small than large zooplankton, had gill rakers better adapted for feeding on small-bodied prey and selected smaller zooplankton compared with bluegill from lakes with anadromous or no alewife. Observed shifts in bluegill foraging traits in lakes with landlocked alewife parallel those in alewife, suggesting interspecific competition leading to parallel phenotypic changes rather than to divergence (which is commonly predicted). Our findings suggest that species may be locally adapted to prey communities structured by different life-history variants of a competing dominant species.
Figure 1 in Spatial distribution of Neoergasilus japonicus (Copepoda: Ergasilidae) on the fins of bluegill (Lepomis macrochirus)
Figure 1. Sections within the dorsal and anal fins of Lepomis macrochirus.
Data from: Intraspecific phenotypic variation among alewife populations drives parallel phenotypic shifts in bluegill
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