Ecological niche theory predicts the coexistence of closely related species is promoted by resource partitioning and leads to the use of different ecological niches. Australian snubfin (Orcaella heinsohni) and humpback (Sousa sahulensis) dolphins live in sympatry throughout most of their range in northern Australia. We compared stable isotope ratios of carbon (\u03b413C) and nitrogen (\u03b415N) in their skin to investigate resource partitioning between these ecologically similar species. Skin samples were collected from live Australian snubfin (n = 31) and humpback dolphins (n = 23) along the east coast of Queensland in 2014-2015. Both species had similar \u03b413C and \u03b415N values and high (>50%) isotopic niche space overlap, suggesting that they feed at similar trophic levels, have substantial dietary overlap, and both rely on similar basal food resources. Despite similarities, snubfin dolphins were more likely to have a larger \u03b415N than humpback dolphins, indicating they may forage on a wider diversity of prey. Humpback dolphins were more likely to have a larger \u03b413C range suggesting they may forage on a wider range of habitats. Overall results suggest that subtle differences in habitat use, and prey selection are likely the principal resource partitioning mechanisms enabling co-existence of Australian snubfin and humpback dolphins.
", "publication_date": "2022-05-04", "publisher": "Zenodo", "resource_type": { "id": "dataset", "title": { "de": "Datensatz", "en": "Dataset" } }, "rights": [ { "description": { "en": "CC0 waives copyright interest in a work you've created and dedicates it to the world-wide public domain. Use CC0 to opt out of copyright entirely and ensure your work has the widest reach." }, "icon": "cc-cc0-icon", "id": "cc0-1.0", "props": { "scheme": "spdx", "url": "https://creativecommons.org/publicdomain/zero/1.0/legalcode" }, "title": { "en": "Creative Commons Zero v1.0 Universal" } } ], "subjects": [ { "subject": "cetaceans" }, { "subject": "Feeding Ecology" }, { "subject": "snubfin dolphin" }, { "subject": "orcaella heinsohni" }, { "subject": "humpback dolphin" }, { "subject": "Sousa sahulensis" }, { "subject": "Resource partitioning" }, { "subject": "C and N stable isotopes" }, { "subject": "SIBER" } ], "title": "Isotopic niche overlap between sympatric Australian snubfin and humpback dolphins" }, "parent": { "access": { "owned_by": { "user": "90070" } }, "communities": { "default": "734b6452-1f40-4db0-b218-08ab1d568b7f", "entries": [ { "access": { "member_policy": "open", "members_visibility": "public", "record_submission_policy": "open", "review_policy": "open", "visibility": "public" }, "children": { "allow": false }, "created": "2020-02-04T14:03:17.992421+00:00", "custom_fields": {}, "deletion_status": { "is_deleted": false, "status": "P" }, "id": "734b6452-1f40-4db0-b218-08ab1d568b7f", "links": {}, "metadata": { "curation_policy": "The Dryad collection in Zenodo contains datasets mirrored from the Dryad Digital Repository. If you want your dataset to appear here, submit it through https://datadryad.org. No other datasets will be accepted.
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