Issue |
Knowl. Manag. Aquat. Ecosyst.
Number 420, 2019
Topical Issue on Fish Ecology
|
|
---|---|---|
Article Number | 24 | |
Number of page(s) | 10 | |
DOI | https://doi.org/10.1051/kmae/2019018 | |
Published online | 17 May 2019 |
Research Paper
Dietary niche divergence between two invasive fish in Mediterranean streams
Divergence de niche trophique de deux poissons invasifs dans les rivières méditerranéennes
1
MARE, Centro de Ciências do Mar e do Ambiente, Faculdade de Ciências, Universidade de Lisboa, Campo Grande,
1749-016
Lisboa, Portugal
2
cE3c, Centro de Ecologia, Evolução e Alterações Ambientais, Faculdade de Ciências, Universidade de Lisboa,
1749-016
Lisboa, Portugal
3
CNRS Université Toulouse III Paul Sabatier UMR5174 EDB (Laboratoire Évolution Diversité Biologique),
118 route de Narbonne,
31062
Toulouse, France
4
Facultad de Medicina Veterinaria y de Zootecnia, Universidad Nacional de Colombia,
Bogotá D.C., Colombia
* Corresponding author: chrisgenas@gmail.com
Received:
3
March
2019
Accepted:
28
April
2019
Clarifying the mechanisms associated with the coexistence of invasive species is important to understand the overall impact of multiple invasions on recipient communities. Here we examined whether divergence or convergence in dietary niche occurred when invasive Lepomis gibbosus and Australoheros facetus coexist in Iberian streams. We used stomach content analyses to determine dietary niche composition, width, and overlap in allopatric and sympatric counterparts in the Lower Guadiana throughout the dry-season. The variations in dietary niche between pumpkinseed and the cichlid were consistent with predictions derived from the niche divergence hypothesis. Although there were no changes in the use of plant material from allopatry to sympatry in either species, sympatric pumpkinseed and the cichlid displayed marked shifts in the use of animal prey and a decrease in niche width relative to allopatric counterparts. Moreover, sympatric pumpkinseed and cichlid showed similar niche width but differed significantly in plant and animal prey use. Taken together these results suggest that divergence in dietary niches may play a role in mediating coexistence of multiple invaders in Iberian streams.
Résumé
Comprendre les mécanismes associés à la coexistence des espèces invasives est important pour comprendre les effets des invasions multiples. Ici, nous avons évalué l'existence possible de divergence ou de convergence de niche trophique lorsque de Lepomis gibbosus et de Australoheros facetus invasives coexistent dans des rivières de la péninsule Ibérique. Nous avons analysé des contenus stomacaux pour déterminer la composition, la taille et le chevauchement des niches trophiques dans les zones allopatriques et sympatriques de la zone aval de la rivière Guadiana, pendant la saison sèche. Les variations de niche trophique observées entre la perche soleil et le cichlidé indique une potentielle divergence de niche. Bien qu'il n'y ait pas eu de changement dans l'utilisation des ressources végétales, les perches soleil et cichlidé sympatriques présentaient des changements marqués dans l'utilisation des proies animales avec une diminution de la taille de la niche par rapport aux individus allopatriques. De plus, les perches soleil et cichlidés sympatriques avaient une taille de niche similaire mais utilisaient différemment les ressources animales et végétales. Ces résultats suggèrent que des divergences de niches trophiques peuvent jouer un rôle dans la coexistence des envahisseurs multiples dans les rivières ibériques.
Key words: species coexistence / biological invasions / trophic ecology / sympatry / allopatry
Mots clés : coexistence d'espèces / invasions biologiques / écologie trophique / sympatrie / allopatrie
© C. Gkenas et al., Published by EDP Sciences 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License CC-BY-ND (http://creativecommons.org/licenses/by-nd/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. If you remix, transform, or build upon the material, you may not distribute the modified material.
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