Nesting microhabitat use and hybridisation of endemic Bartram's Bass in Savannah River tributaries

Judson, Emily; Darden, Tanya L.; Farrae, Daniel J.; Leitner, Jean; Peoples, Brandon K.

doi:10.1111/eff.12585

Cited by 3 publications

(10 citation statements)

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“…Main-stem tributaries are impounded by seven major reservoirs that serve as sources of Alabama Bass throughout the basin; numerous other reservoirs occur on tributaries (Figure 1B). The Piedmont is largely affected by agricultural development and urbanization, whereas the Blue Ridge is heavily forested (Judson et al 2020).…”

Section: Methodsmentioning

confidence: 99%

“…For sites sampled by the SCDNR crew, fin clips were not collected from individuals identified in the field as Largemouth Bass morphotypes; the presence of these individuals were noted but putative Largemouth Bass were not enumerated (Figure 2). A portion of this data set containing only young-ofyear individuals was used to assess year-specific hybridization and nesting microhabitat use by Judson et al (2020).…”

Section: Methodsmentioning

confidence: 99%

“…Genetic species identification.-We utilized two molecular tools for species identification: the diagnostic nuclear and mitochondrial marker methodology of Bangs et al (2018) that was subsequently adapted with a hydrolysis probe for quantitative PCR use (J. Quattro, University of South Carolina, personal communication) and a microsatellite panel (Seyoum et al 2013) that has been used for identification of hybridization in black basses (Tringali et al 2015;Taylor et al 2018b). Though the diagnostic marker and probe methods result in the identification of pure or Genetic methods and analyses are reported in detail by Judson et al (2020). In short, assessment via hydrolysis probe followed Bangs et al (2018) and 16 microsatellite markers were amplified via PCR in three multiplex groups for a reference set of genetically verified species (provided by M. Tringali and B. Barthel, Florida Fish and Wildlife Conservation Commission) and all field-collected samples.…”

Section: Methodsmentioning

confidence: 99%

“…Analysis sensitivity was assessed via GENSBACK, as well as migration rate for the Population Information Test Used for Migrants model with admixture, number of potential clusters (K), and number of iterations per run. The optimized analysis protocol reliably produced reference species assignments using the following run parameters: Population Information Test Used for Migrants with admixture, GENSBACK = 4, migration rate = 0.05 with 20,000 burnin repetitions, and 200,000 Monte Carlo repetitions (Judson et al 2020).…”

Section: Methodsmentioning

confidence: 99%

“…However, Bartram's Bass have since been functionally extirpated from reservoirs by introgression with Alabama Bass (Bangs et al 2018). Since their introduction, Alabama Bass have become widespread in the upper Savannah River basin and have begun colonizing tributaries (Leitner et al 2015;Judson et al 2020). However, the extent of introgression and factors associated with introgression are currently unknown.…”

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confidence: 99%

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Modeling Distribution of Endemic Bartram’s Bass Micropterus sp. cf. coosae: Disturbance and Proximity to Invasion Source Increase Hybridization with Invasive Alabama Bass

Peoples

Judson

Darden

et al. 2021

N American J Fish Manag

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Bartram's Bass" Micropterus sp. cf. coosae is endemic to the upper Savannah River basin of the southeastern United States and is threatened by hybridization with invasive Alabama Bass Micropterus henshalli. Bartram's Bass have been functionally extirpated from reservoirs, and hybrid individuals have been detected in several tributaries. However, the extent of introgression in tributaries is currently unknown. Our objectives were to (1) assess the distribution of Bartram's Bass, native Largemouth Bass M. salmoides, invasive Alabama Bass, and their hybrids in streams of the upper Savannah River basin and (2) quantify effects of abiotic variables on the distribution of each species. We sampled 154 locations in 2017 and 2018 and assigned genetic identity using hydrolysis probes and microsatellites. We used conditional inference trees to quantify variables affecting the occurrence of each species and hybrids. We observed widespread hybridization across the basin. Pure Bartram's Bass were collected at 27% (42) of sites, among which only 12 sites contained pure Bartram's Bass and no other congeners. Thirty sites where pure Bartram's Bass were collected contained hybrids. In the montane Blue Ridge ecoregion, occurrence of pure Bartram's Bass was negatively affected by low levels of local-scale developed land cover. In the lower-relief Piedmont ecoregion, pure Bartram's Bass were positively associated with watershed-scale forest land cover and stream gradient. Distance from a reservoir was positively associated with occurrence of pure Bartram's Bass in both ecoregions. Pure Bartram's Bass are likely to occur with high probability in only 16% of nonimpounded stream segments; this represents a conservative estimate, and the true number is likely lower. However, future work

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Modeling Distribution of Endemic Bartram’s Bass Micropterus sp. cf. coosae: Disturbance and Proximity to Invasion Source Increase Hybridization with Invasive Alabama Bass

Peoples

Judson

Darden

et al. 2021

N American J Fish Manag

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Predictability of flow metrics calculated using a distributed hydrologic model across ecoregions and stream classes: Implications for developing flow–ecology relationships

et al. 2022

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Developing environmental flow standards requires an empirical understanding of the relationship between species' ecology and instream flow. However, when congruent biological and hydrologic data are lacking, the accurate simulation of hydrologic metrics (HMs) corresponding to the locations of biological data is needed. Methods to predict HMs vary in formulation (i.e., statistical vs. process‐based hydrologic models), ability to simulate HMs across the full range of the hydrologic regime (i.e., magnitude, duration, frequency, rate of change and timing) and ability to transfer HMs from gaged to ungaged locations. Yet, despite the breadth of modelling approaches, less attention has been paid to the variability in HMs associated with each approach. In this study, we apply a distributed hydrologic model to the diverse watersheds of South Carolina to examine the predictability of HMs from simulated daily time series of streamflow across ecoregions, stream classifications and level of human alteration. In doing so, we contextualize the predictability of HMs, giving managers and researchers in South Carolina the flexibility of choosing HMs that are best suited for quantifying flow–ecology relationships based on the location, flow regime components of interest and uncertainty of HMs. We found that at least one HM within each of the five flow regime components (out of a selected subset of 41 non‐redundant HMs) was consistently and accurately predicted across the diverse streams of the study area. We discuss the patterns of predictability related to site characterizations and individual HMs and their implications for developing environmental flow standards.

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Limited hybridisation and introgression despite stocking among endemic Interior Highlands black basses (Centrarchidae: Micropterus)

Gunn

Taylor

Buckingham³

et al. 2023

Diversity and Distributions

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AimSmallmouth Bass (Micropterus dolomieu; 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 (M. velox; NB), Little River Bass (M. sp. cf. dolomieu Little River; LRB) and Ouachita Bass (M. sp. cf. dolomieu Ouachita River; OB). We sought to quantify population structure and hybridisation and introgression in these three recently described species.LocationSpecies‐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.MethodsWe 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 (M. punctulatus; SPB). Genomic samples were genotyped on a SNP panel of 192 loci designed to detect allele‐sharing on multiple hierarchical levels.ResultsWe found low range‐wide hybridisation between species in the SMB‐C and SPB (mostly SMB‐C backcrosses), and interspecific heterozygosity varied, indicating differential introgression. Range‐wide hybridisation between species in the CIH and SMB was similar overall (but mostly F2 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).Main ConclusionsDespite isolated incidences of natural (SPB) and human‐mediated (SMB) introgression, genomic identity appears intact in endemic LRB and OB, suggesting potential ecological or behavioural 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.

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Nesting microhabitat use and hybridisation of endemic Bartram's Bass in Savannah River tributaries

Cited by 3 publications

References 50 publications

Modeling Distribution of Endemic Bartram’s Bass Micropterus sp. cf. coosae: Disturbance and Proximity to Invasion Source Increase Hybridization with Invasive Alabama Bass

Modeling Distribution of Endemic Bartram’s Bass Micropterus sp. cf. coosae: Disturbance and Proximity to Invasion Source Increase Hybridization with Invasive Alabama Bass

Predictability of flow metrics calculated using a distributed hydrologic model across ecoregions and stream classes: Implications for developing flow–ecology relationships

Limited hybridisation and introgression despite stocking among endemic Interior Highlands black basses (Centrarchidae: Micropterus)

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