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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Eduardo Morteo conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Axayácatl Rocha-Olivares conceived and designed the experiments, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Rodrigo Morteo performed the experiments, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

David W Weller conceived and designed the experiments, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

Our methods involved only non-invasive data collection (i.e. images were taken onboard a boat that was 15-50 m away from the animals), thus a Review Board was unnecessary.

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

Original photographs from wild dolphins were obtained through federal permit (SGPA/DGVS/518) from Secretaría del Medio Ambiente y Recursos Naturales (SEMARNAT). The remaining images came from photo-identification catalogs from other published and unpublished scientific research; thus it was assumed that all these were approved by their Institutional Review Boards (whenever this applied) and were issued with the federal permits for their field work, such that these can be consulted in each case.

Data Deposition

The following information was supplied regarding data availability:

Technical report:

Morteo, E., R. Morteo, A. Rocha-Olivares. 2005. Diferenciación morfológica de poblaciones de tursión (Tursiops truncatus) en costas mexicanas. Centro de Investigación Científica y de Educación Superior de Ensenada. Ensenada, Baja California, México.

Funding

This research was part of the M.Sc. thesis of the lead author who benefited from a CONACyT (Consejo Nacional de Ciencia y Tecnología) graduate fellowship. Financial aid was also provided by a SNI (Sistema Nacional de Investigadores) scholarship provided by Saúl Álvarez-Borrego, and a thesis grant issued by the Department of Marine Ecology at CICESE. Logistics for the Gulf of California surveys were partially funded by Sergio Flores at UABCS and Drew Talley at UC-Davis. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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