Invasive signal crayfish and native noble crayfish show trophic niche shrinkage in sympatry

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12520%2F25%3A43909687" target="_blank" >RIV/60076658:12520/25:43909687 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3897/neobiota.98.127329" target="_blank" >https://doi.org/10.3897/neobiota.98.127329</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3897/neobiota.98.127329" target="_blank" >10.3897/neobiota.98.127329</a>

Result language

angličtina

Original language name

Invasive signal crayfish and native noble crayfish show trophic niche shrinkage in sympatry

Original language description

Studying the coexistence of native species and invasive species with similar functional traits, habitat usage, and feeding habits is crucial for understanding the dynamics of invasion and ecological changes in the invaded ecosystem. Due to competitive exclusion and often also dissemination of crayfish plague pathogen (Aphanomyces astaci, Schikora), North American crayfish represent a major threat to European native crayfish. Their co-occurrence is often only temporary, making studies investigating trophic ecology of native and non-native crayfish species rare. In this study, trophic niche and feeding ecology of European native noble crayfish Astacus astacus (Linnaeus, 1758) and North American signal crayfish Pacifastacus leniusculus (Dana, 1852) were compared between their sympatric and allopatric sites, in K &amp; rcaron;es &amp; aacute;novsk &amp; yacute; brook (Czech Republic), using carbon and nitrogen stable isotopes analysis. The results indicated a substantial change of trophic niche and diet of noble crayfish between allopatry and sympatry. In allopatry, both juvenile and adult noble crayfish exhibited a wider trophic niche width compared to juvenile and adult signal crayfish. However, in sympatry, where adult and juvenile noble crayfish coexisted with signal crayfish, their trophic niche width significantly narrowed and their diet shifted towards a more plant-based one. High degree of trophic niche overlap was observed between adults and juveniles in both species, particularly in sympatry rather than in allopatry. The substantial trophic niche overlap and dietary similarity between native noble crayfish and invasive signal crayfish in sympatry, make their long term coexistence on the invaded site unlikely.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10618 - Ecology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

NeoBiota

ISSN

1619-0033

e-ISSN

1314-2488

Volume of the periodical

98

Issue of the periodical within the volume

neuvedeno

Country of publishing house

BG - BULGARIA

Number of pages

18

Pages from-to

145-162

UT code for WoS article

001459670300001

EID of the result in the Scopus database

2-s2.0-105002799089