AI Article Synopsis
- * Researchers used close-kin mark-recapture models based on sibling pairs from 226 juvenile speartooth sharks to estimate adult populations in two Australian river systems, finding 892 adults in the Adelaide River and 1128 in the Alligator Rivers.
- * Findings show that female speartooth sharks tend to stay in the same river for breeding, while males from the Alligator Rivers are highly connected to males in the Adelaide River, suggesting that sibling data can effectively inform us about population dynamics in endangered species.
Article Abstract
The viability of spatially structured populations depends on the abundance and connectivity between subpopulations of breeding adults. Yet, for many species, both are extremely difficult to assess. The speartooth shark is a critically endangered elasmobranch inhabiting tropical rivers with only three adults ever recorded in Australia. Close-kin mark-recapture models, informed by sibling pairs among 226 juveniles, were developed to estimate adult abundance and connectivity in two Australian river systems. Sixty-eight sibling pairs were found, and adult abundance was estimated at 892 for the Adelaide River and 1128 for the Alligator Rivers. We found strong evidence for female philopatry, with most females returning to the same river to pup. Adelaide River males appear largely philopatric, whereas Alligator Rivers males are highly connected to the Adelaide River. From only 4 years of sampling, our results demonstrate that juvenile-only kin pairs can inform simultaneous estimates of abundance and connectivity in a rare and threatened species.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9770943 | PMC |
| http://dx.doi.org/10.1126/sciadv.add1679 | DOI Listing |
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