Skip to main content
Log in

Diet variations and morphological changes of the rockcod Patagonotothen tessellata (Teleostei: Nototheniidae) in Chilean Central Patagonia

  • Published:
Environmental Biology of Fishes Aims and scope Submit manuscript

Abstract

This study provides the first description of the morphology (geometric morphometric analysis), condition (Fulton index), and diet (stomach content analyses) of the rockcod Patagonotothen tessellata from the coast of Chilean Central Patagonia. We found low but significant intersexual variability in the snout extension, mouth size, and the insertion of the pelvic fin supporting the presence of sexual shape dimorphism in P. tessellata. The diet of the males showed a preference for Patagonotothen spp., unidentified crustaceans, and polychaetes (Chaetopteridae), while the diet of females was comprised primarily of unidentified fish and crustaceans. Significant differences in the consumption of algae, other invertebrates, and fishes were observed between sexes, and a significant negative correlation between fish length and the ingestion of amphipods was found. Diet composition showed significant differences between sexes, but not among size groups. Finally, a partial least square analysis showed a weak but significant covariance between diet and morphology: individuals with shorter snouts and smaller eyes had more unidentified crustaceans, amphipods, and fish in their stomach contents, while individuals with narrower trunks contained more unidentified crustaceans, the shrimp Betaeus truncatus, and gastropods; and individuals with slenderer heads had more Patagonotothen spp. in their stomachs.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Subscribe and save

Springer+ Basic
EUR 32.99 /Month
  • Get 10 units per month
  • Download Article/Chapter or Ebook
  • 1 Unit = 1 Article or 1 Chapter
  • Cancel anytime
Subscribe now

Buy Now

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

Similar content being viewed by others

Data availability

Raw data are available as Supplementary Material of this work.

References

Download references

Acknowledgements

We thank Ernesto Davis and José Luis Cabello for their help with the fish collections. Also, we thank Leslie Novoa for her lab support.

Funding

This research was partially funded by project INACH RT_08-18 to MFL, and Project “Sistema articulado de investigación en cambio climático y sustentabilidad de zonas costeras de Chile” (IES RED21992, MINEDUC, Chile).

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Mathias Hüne.

Ethics declarations

Ethics approval

Fish collected for this study were approved by the Chilean Fisheries Service under a Technical Memorandum (P.INV No. 224/2016 SUBPESCA).

Conflict of interest

The authors declare no competing interests.

Additional information

Publisher's note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary Information

Below is the link to the electronic supplementary material.

Supplementary file1 (TXT 43 KB)

Rights and permissions

Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Hüne, M., Quintullanca, A., Aldea, C. et al. Diet variations and morphological changes of the rockcod Patagonotothen tessellata (Teleostei: Nototheniidae) in Chilean Central Patagonia. Environ Biol Fish 106, 1425–1442 (2023). https://doi.org/10.1007/s10641-023-01428-8

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10641-023-01428-8

Keywords

Navigation