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8 results for “black basses”
Relative predation rates on juvenile Chinook Salmon in the lower Stanislaus River, California, 2012-2024 by habitat suitability informed by juvenile Chinook Salmon and black bass observations in the lower Stanislaus and Merced rivers, California, 2012-2017
Overview The purpose of this work was to estimate relative predation on juvenile Chinook Salmon rearing in tributaries of the San Joaquin River, California in relation to meso- and microhabitat factors. Predation rates were estimated using predation bioassays. Ranges of depth and velocity targeted by the bioassays were informed by habitat suitability indices developed prior to field efforts. Juvenile Chinook and Bass Habitat Suitability Indices The purpose of this dataset is to develop habitat suitability indices for juvenile Chinook Salmon (<120mm) on the lower Stanislaus River and nonnative black bass ( Micropterus spp.). on the lower Merced River, both tributaries of the San Joaquin. This data was used to identify target ranges of depth and velocity during predation fieldwork. Occupancy data was collected via snorkel surveys on the lower Stanislaus River in 2018 and 2019 and on the Merced River in 2012 and 2014-2017. Predation Tethering Bioassay Study The purpose of this field study was to estimate relative rates of predation of juvenile Chinook Salmon. Predation rates were estimated using assays of tethered hatchery Chinook Salmon deployed across a range of mesohabitats on the lower Stanislaus River. Habitat suitability was expected to vary across mesohabitats and across depths and velocities sampled within habitats. Cameras were deployed with tethers to identify predators for a subset of predation events happening within the first 1-2 hours of deployment. Assays were deployed monthly March-May in 2022 and 2024. A supplemental set of assays were deployed in May 2023 under wet water year conditions that varied strongly from conditions sampled in 2022 and 2024.
Data related to: The recurring role of storm disturbance on black sea bass (Centropristis striata) movement behaviors in the Mid-Atlantic Bight
<p>Summer storm events are a significant source of disturbance in the Middle Atlantic Bight (MAB) that cause rapid destratification of the water column. Storm-driven mixing can be considered as a summertime disturbance regime to demersal communities, characterized by the recurrence of large changes in bottom water temperatures. Black sea bass are a model ubiquitous demersal species in the MAB, as their sedentary behavior exposes them to summer storm disturbances and the physiological stresses associated with thermal destratification. To better understand the responsiveness of black sea bass to storm impacts, we coupled biotelemetry with a high resolution Finite Volume Community Ocean Model (FVCOM). During the summers of 2016-2018, 8-15 black sea bass were released with acoustic transponders at each of three reef sites, which were surrounded by data-logging receivers. Data were analyzed for activity levels, reef departures, and fluctuations in temperature, current velocity, and turbulent kinetic energy. Movement rates were depressed with each consecutive passing storm, and late-season storms were associated with permanent evacuations. Consecutive, compounding increases in bottom temperature associated with repeated storm events were identified as the primary depressor of local movement. Storm-driven increases in turbulent kinetic energy and current velocity had comparatively smaller, albeit significant, effect. The need to better understand the effect of storms on fish populations in the MAB is relevant in understanding both coincident anthropogenic impacts as well as future fisheries management.</p>
Limited hybridization and introgression despite stocking among endemic Interior Highlands black basses (Centrarchidae: Micropterus)
<p><strong>Aim</strong></p> <p>Smallmouth Bass (<em>Micropterus</em> <em>dolomieu</em>; SMB) are globally popular among anglers and have been widely introduced (i.e., stocked) for population management and sportfishing. Importantly, stocking was prevalent before cryptic diversity within the SMB complex was known, which now includes three newly elevated species: Neosho Bass (<em>M</em>. <em>velox</em>; NB), Little River Bass (<em>M</em>. sp. cf. <em>dolomieu</em> Little River; LRB), and Ouachita Bass (<em>M</em>. sp. cf. <em>dolomieu</em> Ouachita River; OB). We sought to quantify population structure and hybridization and introgression in these three recently described species.</p> <p><strong>Location</strong></p> <p>Species-level diversity, particularly in the basin-restricted LRB and OB in the Ouachita Mountains within the Central Interior Highlands (CIH), North America, suggests the presence of distinct genetic variation that could be eroded by introgression. </p> <p><strong>Methods</strong></p> <p>We estimated interspecific introgression and intraspecific population differentiation in the Smallmouth Bass species complex (SMB-C) using 472 specimens comprising SMB, NB, LRB, and OB, including the naturally sympatric Spotted Bass (<em>M</em>. <em>punctulatus</em>; SPB). Genomic samples were genotyped on a SNP panel of 192 loci designed to detect allele-sharing on multiple hierarchical levels. </p> <p><strong>Results</strong></p> <p>We found low range-wide hybridization between species in the SMB-C and SPB (mostly SMB-C backcrosses), and interspecific heterozygosity varied, indicating differential introgression. Range-wide hybridization between species in the CIH and SMB was similar overall (but mostly F<sub>2</sub> and CIH backcrosses) and was observed in streams with known SMB stocking in connected reservoirs. Interspecific heterozygosity in SMB hybrids was also generally lower, indicating later-generation backcrosses. We found strong population structure in the Ouachita Mountains (LRB and OB). </p> <p><strong>Main Conclusions</strong></p> <p>Despite isolated incidences of natural (SPB) and human-mediated (SMB) introgression, genomic identity appears intact in endemic LRB and OB, suggesting potential ecological or behavioral isolating mechanisms preventing cross-species reproduction. Our findings reveal that genetic variation remains in cryptic, basin-restricted species in the Ouachita Mountains ecoregion that may be managed for long-term conservation.</p>
Data related to: The recurring role of storm disturbance on black sea bass (Centropristis striata) movement behaviors in the Mid-Atlantic Bight
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Limited hybridization and introgression despite stocking among endemic Interior Highlands black basses (Centrarchidae: Micropterus)
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Phylogenomics and species delimitation of the economically important Black Basses (Micropterus)
<p>Informed management and conservation efforts are vital to sustainable recreational fishing and biodiversity conservation. Because the taxonomic rank of species is typically targeted in conservation and management strategies, success of these efforts depends on accurate species delimitation. The Black Basses (<em>Micropterus</em>) are an iconic lineage of freshwater fishes that include some of the world's most popular species for recreational fishing and rank among the world's most invasive vertebrate species. Despite their popularity, previous studies to delimit species and lineages in <em>Micropterus</em> suffer from insufficient geographic coverage and uninformative molecular markers. Phylogenomic analyses of ddRAD data result in the delimitation of 19 species in <em>Micropterus</em>, which includes 14 described species, the undescribed but fairly well-known Altamaha Bass, Bartram's Bass, and Choctaw Bass, and two additional undescribed species currently classified as Smallmouth Bass (<em>M. dolomieu</em>). We also provide a revised delimitation of species in the Largemouth Bass complex that necessitates a change in scientific nomenclature: <em>Micropterus salmoides</em> is retained for the Florida Bass and <em>Micropterus nigricans </em>is elevated from synonymy for the Largemouth Bass. Our findings provide a resolved phylogeny of all <em>Micropterus </em>species, insight into the role of introgression in the history of <em>Micropterus</em> diversification, and a robust delimitation of species that differs from current taxonomic classifications and the list of North American fishes maintained by the American Fisheries Society. The new understanding of diversity, distribution, and systematics of Blass Basses will serve as an important basis for the management and conservation of this charismatic and economically important clade of fishes.</p>
Phylogeny and time scale of diversification in the fossil-rich Sunfishes and Black Basses (Teleostei: Percomorpha: Centrarchidae)
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Phylogenomics and species delimitation of the economically important Black Basses (Micropterus)
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