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Data from: Spatial genetic and morphologic structure of wolves and coyotes in relation to environmental heterogeneity in a Canis hybrid zone
- 负责人：
- DOI：
- doi:10.5061/dryad.568kn
- 摘要：
- Eastern wolves have hybridized extensively with coyotes and gray wolves and are listed as a ‘species of special concern’ in Canada. However, a distinct population of eastern wolves has been identified in Algonquin Provincial Park (APP) in Ontario. Previous Canis studies have not linked genetic analysis with field data to investigate genotype-specific morphology or determine how resident animals of different ancestry are distributed across the landscape in relation to heterogeneous environmental conditions. Accordingly, we studied resident wolves and coyotes in and adjacent to APP to identify distinct Canis types, clarify the occurrence of eastern wolves adjacent to APP, and investigate spatial genetic structure and landscape-genotype associations in the hybrid zone. We documented 3 genetically distinct Canis types that also differed morphologically, corresponding to putative gray wolves, eastern wolves, and coyotes. We also documented a substantial number of hybrid individuals (36%). Breeding eastern wolves were less common outside of APP, but occurred in some unprotected areas. We identified a steep cline extending west from APP where the dominant genotype shifted abruptly from eastern wolves to coyotes and hybrids. The genotypic pattern to the south and northwest was a more complex mosaic of alternating genotypes. We modeled genetic ancestry in response to prey availability and human disturbance and found positive and negative associations between wolf ancestry and 1) moose density and 2) road densities, respectively. Our results clarify the structure of the Canis hybrid zone adjacent to APP and provide unique insight into environmental conditions influencing hybridization dynamics between wolves and coyotes.
Data from: Den site selection, pack composition, and reproductive success in endangered African wild dogs
- 负责人：
- DOI：
- doi:10.5061/dryad.d27vt
- 摘要：
- Habitat quality is often assumed to be directly related to increased consumer density, but such assumptions cannot be made without supporting demographic data that indicate improved fitness. Habitat selection might be especially important for denning species, where vulnerable offspring are confined to a single location for extended periods, but the effect of den choice on the reproductive success of denning species is poorly understood. By combining airborne high-resolution Light Detection and Ranging (LiDAR) measurements with data on pack composition, we investigated den site selection by endangered African wild dogs in Hluhluwe-iMfolozi Park, South Africa, examining whether habitat selection based on ecological factors resulted in increased litter sizes and thus reproductive success compared with social factors known to be important. Although there was selection for den sites in areas of increased terrain ruggedness and vegetation density, only vegetation density was associated with larger litter sizes and translated into increased reproductive success. Moreover, pack size was only influential when a minimum vegetation density around den sites was achieved, indicating that although social variables have a powerful effect on reproductive success, they are mediated by ecological factors defining habitat quality. Our results demonstrate the importance of distinguishing between density- and fitness-based indicators of habitat quality, and how this can affect management actions, particularly for endangered species conservation.
Data from: Distinct predatory behaviors in scimitar- and dirk-toothed sabertooth cats
- 负责人：
- DOI：
- doi:10.5061/dryad.7rh4625
- 摘要：
- Over the Cenozoic, large cat-like forms have convergently evolved into specialized killers of ‘megaherbivores’ that relied on their large, and laterally-compressed (saber-like) canines to rapidly subdue their prey [1-5]. Scimitar- and dirk-toothed sabertooths are distinct ecomorphs that differ in canine tooth length, degree of serration, and postcranial features indicative of dissimilar predatory behavior [6-13]. Despite these differences, it is assumed that they used a similar ‘canine-shear’ bite to kill their prey [14,15]. We investigated the killing behavior of the scimitar-toothed Homotherium serum and the dirk-toothed Smilodon fatalis using a comparative sample of living carnivores and a new quantitative approach to the analysis of skull function. For the first time, we quantified differences in the relative amount and distribution of cortical and trabecular bone in coronal sections of skulls to assess relative skull stiffness and flexibility [16-19]. We also use finite element analysis to simulate various killing scenarios that load skulls in ways that likely favor distinct proportions of cortical versus trabecular bone across the skull. Our data reveal that S. fatalis had an extremely thick skull and relatively little trabecular bone, consistent with a large investment in cranial strength for a stabbing canine-shear-bite. However, H. serum had more trabecular bone, and likely deployed an unusual predatory behavior more similar to the clamp-and-hold technique of the lion than S. fatalis. These data broaden the killing repertoire of sabertooths and highlight the degree of ecological specialization among members of the large carnivore guild during the Late Pleistocene of North America.
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.x8mpft
- 摘要：
- A dataset containing 665 species occurrences available in GBIF matching the query: TaxonKey: Lycaon pictus (Temminck, 1820). The dataset includes 665
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.qp8zvc
- 摘要：
- A dataset containing 534 species occurrences available in GBIF matching the query: TaxonKey: Lycaon pictus (Temminck, 1820). The dataset includes 534
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.upuxi9
- 摘要：
- A dataset containing 630 species occurrences available in GBIF matching the query: TaxonKey: Lycaon pictus (Temminck, 1820). The dataset includes 630
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.z3gupr
- 摘要：
- A dataset containing 607 species occurrences available in GBIF matching the query: TaxonKey: Lycaon pictus (Temminck, 1820). The dataset includes 607
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.nic1en
- 摘要：
- A dataset containing 535 species occurrences available in GBIF matching the query: TaxonKey: Lycaon pictus (Temminck, 1820). The dataset includes 535
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.zffq7p
- 摘要：
- A dataset containing 536 species occurrences available in GBIF matching the query: TaxonKey: Lycaon pictus (Temminck, 1820). The dataset includes 536
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.lbbig6
- 摘要：
- A dataset containing 537 species occurrences available in GBIF matching the query: TaxonKey: Lycaon pictus (Temminck, 1820). The dataset includes 537
