Comparison of 13C and 15N discrimination factors and turnover rates between congeneric crayfish Orconectes rusticus and O. virilis (Decapoda, Cambaridae)

Glon, Mael G.; Larson, Eric R.; Pangle, Kevin L.

doi:10.1007/s10750-015-2527-3

Cited by 23 publications

(14 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where 2.54 is the rusty crayfish discrimination factor or fractionation factor (Δ) representing the absolute difference in δ 15 N between rusty crayfish and its diet, determined in laboratory based on an algae diet (Glon, Larson, & Pangle, 2015). We applied a single fractionation factor to all trophic links of the food web between primary consumers and crayfish and did not account for fractionation differences among crayfish diets due to a lack of more specific reference values.…”

Section: Stable Isotope Analysismentioning

confidence: 99%

Phenotypic variability of rusty crayfish (Faxonius rusticus) at the leading edge of its riverine invasion

Messager

Olden

2019

Freshwater Biology

View full text Add to dashboard Cite

Species around the globe are undergoing phenotypic shifts at ecologically relevant timescales as they invade new ecosystems and respond to changing environments. Disentangling the contribution of environmental gradients from the process of range expansion in shaping these changes, and identifying the specific traits undergoing selection, are both critical to anticipate the secondary spread and impact of invasive species. Here, we investigate phenotypic changes in rusty crayfish (Faxonius rusticus), a nuisance invasive species, through an extensive survey of their invasion gradient in multiple tributaries of the John Day River (JDR, Oregon, U.S.A.), a major tributary of the Columbia River. Rusty crayfish in the JDR have developed better physiological condition (intrinsic growth and/or reproductive potential measured as RNA/DNA ratio) but less competitive morphology (lighter body and smaller claws) as they spread upstream and downstream from their location of initial introduction. In addition, rusty crayfish in invasion front populations are at a lower trophic level than conspecifics closer to core areas. By accounting for variations in temperature, primary productivity, and prey (macroinvertebrates) biomass throughout the invasion extent of rusty crayfish, our findings suggest that low conspecific densities at the invasion edge and spatial sorting primarily drive these phenotypic changes. The trends observed here are thus likely to intensify over time as rusty crayfish continues to rapidly spread throughout the JDR and reach the mainstem Columbia River. Our study shows that phenotypic shifts can manifest rapidly over environmental gradients experienced during the range expansion of aquatic invasive species. Patterns in both morphological and functional traits documented in the JDR demonstrate the importance of both environmental factors and dispersal processes in shaping these responses in riverine networks.

show abstract

Section: Stable Isotope Analysismentioning

confidence: 99%

Phenotypic variability of rusty crayfish (Faxonius rusticus) at the leading edge of its riverine invasion

Messager

Olden

2019

Freshwater Biology

View full text Add to dashboard Cite

show abstract

“…Some authors e.g. [63][64][65] have examined crayfish specific 13 C for macroinvertebrates and crayfish, respectively 66 , and 2.4 ± 0.42‰ for δ 15 N and 0.40 ± 0.28‰ for δ 13 C for detritus and periphyton, respectively 67 . www.nature.com/scientificreports/…”

Section: Stomach Content Analysismentioning

confidence: 99%

Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem

Ercoli

Ghia

Gruppuso

et al. 2021

Sci Rep

View full text Add to dashboard Cite

The occurrence of the signal crayfish Pacifastacus leniusculus in the Valla Stream was the first established population of this invasive species recorded in an Italian stream ecosystem. We evaluated the seasonality of diet and trophic niche of invasive signal crayfish in order to estimate the ecological role and effects on native communities of the stream ecosystem. We studied the differences in food source use between sexes, life stages and seasons using carbon and nitrogen stable isotope analyses. To supplement stable isotope analyses, we evaluated food source usage using traditional stomach content analysis. We tested the hypothesis that juveniles have a different diet, showing different trophic niches, compared to adults. Results indicated that signal crayfish adult and juvenile diets mainly rely on macroinvertebrates and periphyton in summer, shifting to mostly periphyton in autumn. Although the two age classes occupied an equivalent trophic niche, juveniles showed slightly different carbon isotope values, suggesting a somewhat ontogenetic shift consistent among seasons. No significant differences were found in adult and juvenile diets between summer and autumn seasons. Our findings suggest that signal crayfish juveniles and adults exhibited seasonal feeding habits, probably due to ecological behaviour rather than food resource availability, and that both are likely to impose similar effects on macroinvertebrate communities in this and similar stream ecosystems.

show abstract

“…As expected, littoral individuals consumed more resources originating from the littoral habitat than pelagic individuals. Given the turnover rate of stable isotope values in crayfish muscle tissue (>1 month; Carolan, Mazumder, Dimovski, Diocares, & Twining, 2012;Glon, Larson, & Pangle, 2016), these findings indicate that the feeding activity of individuals occurs within their respective habitats. There was, however, no significant difference in trophic position between littoral and pelagic individuals.…”

Section: Discussionmentioning

confidence: 86%

Stable resource polymorphism along the benthic littoral–pelagic axis in an invasive crayfish

Lang

Evangelista

Everts

et al. 2020

Ecology and Evolution

View full text Add to dashboard Cite

Although intraspecific variability is now widely recognized as affecting evolutionary and ecological processes, our knowledge on the importance of intraspecific variability within invasive species is still limited. This is despite the fact that understanding the linkage between within‐population morphological divergences and the use of different trophic or spatial resources (i.e., resource polymorphism) can help to better predict their ecological impacts on recipient ecosystems. Here, we quantified the extent of resource polymorphism within populations of a worldwide invasive crayfish species, Procambarus clarkii, in 16 lake populations by comparing their trophic (estimated using stable isotope analyses) and morphological characteristics between individuals from the littoral and pelagic habitats. Our results first demonstrated that crayfish occured in both littoral and pelagic habitats of seven lakes and that the use of pelagic habitat was associated with increased abundance of littoral crayfish. We then found morphological (i.e., body and chelae shapes) and trophic divergence (i.e., reliance on littoral carbon) among individuals from littoral and pelagic habitats, highlighting the existence of resource polymorphism in invasive populations. There was no genetic differentiation between individuals from the two habitats, implying that this resource polymorphism was stable (i.e., high gene flow between individuals). Finally, we demonstrated that a divergent adaptive process was responsible for the morphological divergence in body and chela shapes between habitats while difference in littoral reliance neutrally evolved under genetic drift. These findings demonstrated that invasive P. clarkii can display strong within‐population phenotypic variability in recent populations, and this could lead to contrasting ecological impacts between littoral and pelagic individuals.

show abstract

Comparison of 13C and 15N discrimination factors and turnover rates between congeneric crayfish Orconectes rusticus and O. virilis (Decapoda, Cambaridae)

Cited by 23 publications

References 59 publications

Phenotypic variability of rusty crayfish (Faxonius rusticus) at the leading edge of its riverine invasion

Phenotypic variability of rusty crayfish (Faxonius rusticus) at the leading edge of its riverine invasion

Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem

Stable resource polymorphism along the benthic littoral–pelagic axis in an invasive crayfish

Contact Info

Product

Resources

About