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The authors are grateful to the Asociacion de Amigos-University of Navarra, which awarded Ivan Vedia a doctoral grant (2012-2016). This research was funded by the Research Program of the University of Navarra (PIUNA 2014-16).

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Almeida, DavidCorresponding Author

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May 6, 2019
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Behavioral Interactions and Trophic Overlap between Invasive Signal Crayfish Pacifastacus leniusculus (Decapoda, Astacidae) and Native Fishes in Iberian Rivers

Publicated to:Water. 11 (3): 459- - 2019-03-05 11(3), DOI: 10.3390/w11030459

Authors: Vedia, Ivan; Almeida, David; Rodeles, Amaia A; Leunda, Pedro M; Baquero, Enrique; Galicia, David; Oscoz, Javier; Elustondo, David; Santamaria, Jesus M; Miranda, Rafael

Affiliations

Univ Navarra, LICA, C Irunlarrea 1, E-31080 Pamplona, Spain - Author
Univ Navarra, Sch Sci, Dept Environm Biol, C Irunlarrea 1, E-31080 Pamplona, Spain - Author
Univ San Pablo CEU, CEU Univ, Fac Med, Dept Ciencias Med Bas, Campus Monteprincipe, E-28925 Madrid, Spain - Author

Abstract

The signal crayfish Pacifastacus leniusculus Dana, 1852 is a successful invasive species in the Iberian Peninsula. This is of particular conservation concern, as fish fauna is highly endemic and also threatened within this ecoregion. The aim of this study was to analyze behavioral interactions and trophic overlap between signal crayfish and native fishes in Iberian rivers (northern Spain). Video cameras were used to record fish dominance/evasion after spatial encounters with crayfish. Diet composition and isotopic signatures (delta C-13 and delta N-15) were compared to evaluate the niche overlap. Fish were dominant in 25% of the encounters with juvenile crayfish, whereas this percentage was only 4% with adult crayfish. Observations showed a high fish evasion response for Pyrenean stone loach Barbatula quignardi (Bcescu-Mester, 1967) (>30%). Dietary results showed a high trophic overlap between signal crayfish with the pelagic Pyrenean minnow Phoxinus bigerri Kottelat, 2007 and the benthic loach. However, the isotopic niche overlap was low, with brown trout Salmo trutta L., 1758 showing the highest area (only 0.1 parts per thousand(2)). Overall, our findings suggest that interferences may occur with native species for food (i.e., benthic invertebrates). Consequently, measures should be applied to control invasive crayfish in Iberian rivers.

Keywords

AbundanceAgonistic interactionsAquatic communitiesBrown troutCompetitionConservationDietDirectDirect/indirect interactionsEcological impactsIndirect interactionsNiche widthResponsesSpecies introductionStable isotope analysisStable-isotopesTrophic levelsVariability

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Water due to its progression and the good impact it has achieved in recent years, according to the agency Scopus (SJR), it has become a reference in its field. In the year of publication of the work, 2019, it was in position , thus managing to position itself as a Q1 (Primer Cuartil), in the category Geography, Planning and Development.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 1.21, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Jul 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-07-16, the following number of citations:

  • WoS: 5
  • Scopus: 4

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-07-16:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 41 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

    It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

    • The work has been submitted to a journal whose editorial policy allows open Open Access publication.

    Leadership analysis of institutional authors

    the author responsible for correspondence tasks has been ALMEIDA REAL, DAVID.