Trophic assessment of three sympatric batoid species in the Southern Gulf of California

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2023
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Enríquez-García, Arturo Bell
Cruz-Escalona, Víctor Hugo
Carriquiry, José D.
Mejía-Falla, Paola A.
Marín-Enríquez, Emigdio
Treinen-Crespo, Christina
Vélez-Tacuri, José R.
Navia, Andrés F.
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PeerJ. PeerJ. 2023, 11, e16117. eISSN 2167-8359. Available under: doi: 10.7717/peerj.16117
Zusammenfassung

The competitive exclusion principle establishes that the coexistence of closely related species requires a certain degree of resource partitioning. However, populations have individuals with different morphological or behavioral traits ( e.g ., maturity stages, sexes, temporal or spatial segregation). This interaction often results in a multi-level differentiation in food preferences and habits. We explored such resource partitioning between and within three batoid species: Hypanus dipterurus , Narcine entemedor , and Rhinoptera steindachneri in the southern Gulf of California, Mexico, using a combination of stomach content (excluding R. steindachneri ) and stable isotope analyses. We found a clear differentiation between H. dipterurus and N. entemedor , where the latter exhibited more benthic habitats, supported by a greater association to infaunal prey and higher δ 13 C values. Though the degree and patterns of intra-specific segregation varied among species, there was a notable differentiation in both sex and stage of maturity, corresponding to changes in specialization ( i.e ., isotopic niche breadth) or trophic spectrum (varying prey importance and isotopic values per group). This work is a promising step towards understanding the dietary niche dynamics of these species in a potentially important feeding area within the southern Gulf of California, as well as the biological and ecological mechanisms that facilitate their coexistence.

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570 Biowissenschaften, Biologie
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General Agricultural and Biological Sciences, General Biochemistry, Genetics and Molecular Biology, General Medicine, General Neuroscience
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ISO 690ENRÍQUEZ-GARCÍA, Arturo Bell, Víctor Hugo CRUZ-ESCALONA, José D. CARRIQUIRY, Nicolas EHEMANN, Paola A. MEJÍA-FALLA, Emigdio MARÍN-ENRÍQUEZ, Christina TREINEN-CRESPO, José R. VÉLEZ-TACURI, Andrés F. NAVIA, 2023. Trophic assessment of three sympatric batoid species in the Southern Gulf of California. In: PeerJ. PeerJ. 2023, 11, e16117. eISSN 2167-8359. Available under: doi: 10.7717/peerj.16117
BibTex
@article{EnriquezGarcia2023-09-22Troph-68144,
  year={2023},
  doi={10.7717/peerj.16117},
  title={Trophic assessment of three sympatric batoid species in the Southern Gulf of California},
  volume={11},
  journal={PeerJ},
  author={Enríquez-García, Arturo Bell and Cruz-Escalona, Víctor Hugo and Carriquiry, José D. and Ehemann, Nicolas and Mejía-Falla, Paola A. and Marín-Enríquez, Emigdio and Treinen-Crespo, Christina and Vélez-Tacuri, José R. and Navia, Andrés F.},
  note={Article Number: e16117}
}
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