Length–Weight and Morphological Relationships for Ecological Studies Involving Ringed Crayfish (Faxonius neglectus neglectus): An Extraregional Invader

Rodger, Anthony W.; Starks, Trevor A.

doi:10.1656/058.019.0403

Cited by 6 publications

(7 citation statements)

References 40 publications

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“…Cardinal Shiner Luxilus cardinalis and Central Stoneroller Campostoma anomalum were collected to reconstruct prey sizes based on cleithrum and pharyngeal teeth measurements following Hansel et al (1988). Ringed crayfish biomass estimates were obtained from Rodger and Starks (2020), and the same methods were applied to a reference collection of Neosho midget crayfish. All other invertebrate biomass estimates were derived using published length-dry mass equations (Ganihar 1997;Benke et al 1999;Sabo et al 2002).…”

Section: Methodsmentioning

confidence: 99%

“…Lastly, this estimate was multiplied by seven to estimate weekly consumption and summed across seasons to estimate the total number of crayfish consumed. We calculated the average size (TL; mm) of crayfish consumed and then used the equations in Rodger and Starks (2020) to determine the average dry weight (g). The average size of crayfish (g) was multiplied by the total number of crayfish consumed to estimate the total crayfish biomass removed through predation.…”

Section: Methodsmentioning

confidence: 99%

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Seasonal Diet and Habitat Use of Large, Introduced Rainbow Trout in an Ozark Highland Stream

Rodger¹,

Wolf

Starks³

et al. 2021

N American J Fish Manag

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Stocking of Rainbow TroutOncorhynchus mykiss commonly provides seasonal or mitigation fisheries; however, these fish are usually small and ecosystem effects are spatially or temporally limited. Yet agencies receive requests to stock Rainbow Trout in relatively natural settings (i.e., not tailwater or mitigation fisheries), where introductions may have greater ecosystem consequences. The size of introduced fish is an important factor in determining biotic interactions with native species; therefore, our objectives were to assess the seasonal feeding ecology and microhabitat use of large ( 265-530 mm TL) nonnative Emmerson strain Rainbow Trout in a relatively unaltered, groundwater-influenced, warmwater stream of the Ozark Highlands. Rainbow Trout consumed a variety of prey; however, diets differed between cool (winter and spring) and warm (summer) seasons. Cool-season Rainbow Trout exhibited a mixed feeding strategy, with individual specialization on crayfishes and fishes and generalist feeding on Ephemeroptera and Diptera, but Gastropoda were the dominant prey. Feeding strategy in the warm season switched to individual specialization on numerous prey types. Overall, larger prey resources were important components of Rainbow Trout diets. Piscivory was relatively high in both seasons, and crayfishes were one of the most important prey types across seasons. Selection of coarse substrates and deeper-water microhabitats (>0.95 m) was similar between seasons. Rainbow Trout selected the lowest-velocity microhabitats available during the warm season and moderate velocities in the cool season. Rainbow Trout were five times more likely to be associated with cover in the warm season. Due to their higher temperature tolerance, Emmerson strain Rainbow Trout may persist in Ozark Highland streams, where they disrupt local food webs and occupy habitat otherwise selected by native fish, such as Neosho Smallmouth Bass Micropterus dolomieu velox. If native species conservation is a priority for agencies, then caution regarding Rainbow Trout stockings may be warranted.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Seasonal Diet and Habitat Use of Large, Introduced Rainbow Trout in an Ozark Highland Stream

Rodger¹,

Wolf

Starks³

et al. 2021

N American J Fish Manag

Self Cite

View full text Add to dashboard Cite

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“…Only males were measured due to evident sexual dimorphism in F . neglectus (Rodger & Starks, 2020). If 30 adult male crayfish were not caught within the 35 subsamples, an extra hour of kicking or until 30 males were caught was required.…”

Section: Methodsmentioning

confidence: 99%

“…To assess whether there are morphological differences between populations of F. neglectus, we measured the total carapace length, chelae length and chelae width of 30 adult male F. neglectus from each stream segment. Only males were measured due to evident sexual dimorphism in F. neglectus (Rodger & Starks, 2020). If 30 adult male crayfish were not caught within the 35 subsamples, an extra hour of kicking or until 30 males were caught was required.…”

Section: Stream Segment Samplingmentioning

confidence: 99%

Morphological traits related to potential invasiveness of two subspecies of the crayfish Faxonius neglectus

Magoulick

Wynne

Clark

2022

River Research & Apps

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Biological invasions have major environmental and economic impacts, and pose a serious threat to global biodiversity. Invasive crayfish species are one of the greatest threats to native crayfish biodiversity. Additionally, almost 50% of US and Canadian species are considered at risk, making crayfish one of the most imperiled taxonomic groups in the world. Small‐scale (extralimital) invasions are often overlooked and may be more common than large‐scale (extraregional) invasions. One example of an extraregional and extralimital invader is the Ringed Crayfish (Faxonius neglectus), which has been independently introduced multiple times to drainages throughout the United States, including those adjacent to its native range. Traits related to invasiveness, such as chelae size, are suggested to differ between invasive crayfish from extralimital and extraregional source populations with larger size related to increased invasiveness. We examined morphological traits related to invasion potential for both subspecies of F. neglectus, F. neglectus neglectus and F. neglectus chaenodactylus. We sampled 28 stream sites within the known native range of F. neglectus, including the Neosho and Upper White River drainages in Oklahoma, Arkansas and Missouri. Total carapace length, chelae length and chelae width of 30 adult male F. neglectus were measured from each site. We found significant differences in crayfish morphological characteristics among stream sites. We found significantly greater chelae length:carapace length (ChL:CarL) and chelae width:chelae length (ChW:ChL) in F. neglectus chaenodactylus than F. neglectus neglectus. Even among F. neglectus neglectus populations, there were significant differences in ChL:CarL and ChW:ChL. Morphological characteristics suggest that F. neglectus chaenodactylus and some populations of F. neglectus neglectus may be pre‐adapted to the role of invader.

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“…Reference specimens of two abundant cyprinid species hypothesised a priori to be prominent components of Neosho bass diets, the central stoneroller, Campostoma anomalum (Rafinesque) and cardinal shiner, Luxilus cardinalis (Mayden), were used to estimate size at ingestion based on cleithrum and pharyngeal tooth measurements (Hansel et al, 1988; Scharf et al, 1998; Trippel & Beamish, 1987). Ringed crayfish, Faxonius neglectus neglectus (Faxon), length and biomass were estimated using equations provided in Rodger and Starks (2020). Because of differences in morphology, the same methods were applied to a reference collection of Neosho midget crayfish, F. macrus , to develop a separate equation for Neosho midget crayfish.…”

Section: Methodsmentioning

confidence: 99%

Seasonal changes in abundance and feeding ecology of an endemic, keystone predator following the introduction of large rainbow trout Oncorhynchus mykiss

Rodger¹,

Starks²

2022

Fisheries Management Eco

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The popularity of rainbow trout Oncorhynchus mykiss (Walbaum), both as sportfish and as a protein source, led to its humanmediated global range expansion into waters on every continent except Antarctica (MacCrimmon, 1972). Now present in at least 82 countries, the rainbow trout is considered one of the most invasive fish species in the world (Cambray, 2003;Crawford & Muir, 2008).Their range expansion has been accompanied by much research devoted to investigating effects of introduced rainbow trout

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Length–Weight and Morphological Relationships for Ecological Studies Involving Ringed Crayfish (Faxonius neglectus neglectus): An Extraregional Invader

Cited by 6 publications

References 40 publications

Seasonal Diet and Habitat Use of Large, Introduced Rainbow Trout in an Ozark Highland Stream

Seasonal Diet and Habitat Use of Large, Introduced Rainbow Trout in an Ozark Highland Stream

Morphological traits related to potential invasiveness of two subspecies of the crayfish Faxonius neglectus

Seasonal changes in abundance and feeding ecology of an endemic, keystone predator following the introduction of large rainbow trout Oncorhynchus mykiss

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