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Pairwise FST values and correlation of genetic and geographic distance between all bioregions calculated from 948 crocodiles. All entries in a) are significant with bootstrap (replicates = 1000) p‐values less than the FDR adjusted threshold of 0.05. Row and columns in panel (a) are ordered by position along the Queensland coast from west to east. Bioregion abbreviations are ALD, Albert‐Leichhardt drainage; APrR, Ayr – Proserpine – Rockhampton; CA, Cooktown – Ayr; CMC, Cape Melville – Cooktown; MGD, Mitchell‐Gilbert drainage; NFD, Norman‐Flinders drainage. Panel (b) shows the positive correlation between coastal distance and Slatkin's linearized FST. The black line indicates the fitted regression line with the coefficients detailed in the figure. The Mantel correlation coefficient and its associated significance are also shown. The point comparing the Coastal Plains – APrR and Fitzroy bioregions is highlighted.
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Abstract Effective management of protected species requires information on appropriate evolutionary and geographic population boundaries and knowledge of how the physical environment and life‐history traits combine to shape the population structure and connectivity. Saltwater crocodiles (Crocodylus porosus) are the largest and most widely distribut...
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Citations
... When implementing management strategies for at-risk species, understanding the magnitude of population connectivity is critical. It informs the identification of key habitats and corridors connecting populations, sheds light on the possible impact of human activities on these vital connections, guides reintroduction and translocation efforts, and ultimately aids in formulating substantial strategies aimed at maintaining genetic diversity and species persistence [25][26][27][28]. Within the existing range of a species, strong population connectivity may manifest as climate stability compared to regions with weak or absent linkages, which are known as climate change refugia [29,30]. ...
Understanding the niche dynamic among distinct populations and delineating the dispersal corridors that exist between them under current climates is critical for elucidating the contemporary forces driving genetic divergence, facilitating population connectivity, and informing targeted conservation efforts, particularly for species exhibiting pronounced intraspecific lineages. In this study, we focus on evaluating the range and niche dynamics of the intraspecific lineages of Emmenopterys henryi and exploring potential patterns of population connectivity both within and across these lineages. Our findings unveiled a significant niche divergence between the two intraspecific lineages, characterized by limited overlap in climatic conditions and suitable ranges. Furthermore, our analysis of population connectivity revealed the presence of dispersal routes with varying degrees of connectivity within each lineage, while low connectivity was observed between the two lineages. Our results highlight the critical role of fine-scale ecological niche models (ENMs) and genetic connectivity analyses in elucidating the complexities of niche evolution and genetic connectivity, particularly for species with discrete intraspecific lineages. In addition, given the fact that rapid genetic erosion of species inhabiting the regions we focus on in this study is often associated with habitat loss and fragmentation, our findings will also offer valuable insights for designing targeted conservation strategies aimed at restoring connectivity and increasing local population sizes for this endangered species.
Management programs that successfully recovered wild saltwater crocodile ( Crocodylus porosus ) populations in the Northern Territory of Australia did so with an expanding commitment to maintaining public safety. One aspect of the program is the ongoing removal of resident and immigrant crocodiles within Darwin Harbor (since 1979), the main urban center. We determined the likely sources of crocodiles caught as problem animals between 2015–2017 by comparing recently developed methods for population assignment. Depending on the assignment model used, we estimated that between 30% and 50% of crocodiles in Darwin Harbor originated from the Adelaide and Mary rivers, and the Kakadu region east of Darwin, and between 20% and 30% of crocodiles originated from the Finniss, Reynolds, and Daly rivers southwest of Darwin. Saltwater crocodiles occur at particularly high densities in these catchments. The remainder came from a mixture of different sources across the Northern Territory. The most common animals captured were immature (150–180 cm) males that have traveled 100–200 km. We did not identify any relationships between the distance from the inferred origin to Darwin Harbor and the size and sex of the crocodiles, or the year of capture. The targeted removal of crocodiles from specific sites such as Darwin Harbor, near where most people live, improves public safety in the highest risk areas, without compromising abundant source populations in most areas.
