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Data from: Vocalisations of killer whales (Orcinus orca) in the Bremer Canyon, Western Australia
- 负责人：
- DOI：
- doi:10.5061/dryad.1h46d
- 摘要：
- To date, there has been no dedicated study in Australian waters on the acoustics of killer whales. Hence no information has been published on the sounds produced by killer whales from this region. Here we present the first acoustical analysis of recordings collected off the Western Australian coast. Underwater sounds produced by Australian killer whales were recorded during the months of February and March 2014 and 2015 in the Bremer Canyon in Western Australia. Vocalisations recorded included echolocation clicks, burst-pulse sounds and whistles. A total of 28 hours and 29 minutes were recorded and analysed, with 2376 killer whale calls (whistles and burst-pulse sounds) detected. Recordings of poor quality or signal-to-noise ratio were excluded from analysis, resulting in 142 whistles and burst-pulse vocalisations suitable for analysis and categorisation. These were grouped based on their spectrographic features into nine Bremer Canyon (BC) “call types”. The frequency of the fundamental contours of all call types ranged from 600 Hz to 29 kHz. Calls ranged from 0.05 to 11.3 seconds in duration. Biosonar clicks were also recorded, but not studied further. Surface behaviours noted during acoustic recordings were categorised as either travelling or social behaviour. A detailed description of the acoustic characteristics is necessary for species acoustic identification and for the development of passive acoustic tools for population monitoring, including assessments of population status, habitat usage, migration patterns, behaviour and acoustic ecology. This study provides the first quantitative assessment and report on the acoustic features of killer whales vocalisations in Australian waters, and presents an opportunity to further investigate this little-known population.
Data from: Killer whales (Orcinus orca) in Iceland show weak genetic structure among diverse isotopic signatures and observed movement patterns
- 负责人：
- DOI：
- doi:10.5061/dryad.674k8j4
- 摘要：
- east Pacific, killer whales (Orcinus orca) of the same population have uniform specialized diets that are non-overlapping with other sympatric, genetically divergent
Data from: Geographic and temporal dynamics of a global radiation and diversification in the killer whale
- 负责人：
- DOI：
- doi:10.5061/dryad.fm4mk
- 摘要：
- these dynamics in the most widely distributed of marine mammals, the killer whale (Orcinus orca), using a global data set of over 450 samples. This marine
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.heqlad
- 摘要：
- A dataset containing 84 species occurrences available in GBIF matching the query: TaxonKey: Orcinus orca (Linnaeus, 1758) HasGeospatialIssue: false
Data from: A multilevel society of herring-eating killer whales indicates adaptation to prey characteristics
- 负责人：
- Tavares, Sara B.
- 关键词：
- orca ecological context hierarchical structure multilevel societies social structure killer whale
- DOI：
- doi:10.5061/dryad.j619s
- 摘要：
- Non-social factors can influence animal social structure. In killer whales (Orcinus orca), fish- versus mammal-eating ecological differences ar
Data from: Mortality risk and social network position in resident killer whales: sex differences and the importance of resource abundance
- 负责人：
- 关键词：
- DOI：
- doi:10.5061/dryad.654sm
- 摘要：
- the relationship between social position and mortality risk in resident killer whales (Orcinus orca) using over three decades of social and demographic data
Data from: Generation time, net reproductive rate, and growth in stage-age structured populations
- 负责人：
- DOI：
- doi:10.5061/dryad.3m5fc
- 摘要：
- Major insights into the relationship between life-history features and fitness have come from Lotka’s proof that population growth rate is determined by the level (expected amount) of reproduction and the average timing of reproduction of an individual. But this classical result is limited to age-structured populations. Here we generalize this result to populations structured by stage and age by providing a new, unique measure of reproductive timing (Tc) that, along with net reproductive rate (R0), has a direct mathematical relationship to and approximates growth rate (r). We use simple examples to show how reproductive timing Tc and level R0 are shaped by stage dynamics (individual trait changes), selection on the trait, and parent-offspring phenotypic correlation. We also show how population structure can affect dispersion in reproduction among ages and stages. These macroscopic features of the life history determine population growth rate r and reveal a complex interplay of trait dynamics, timing, and level of reproduction. Our results contribute to a new framework of population and evolutionary dynamics in stage-and-age-structured populations.
Data from: Evaluating anthropogenic threats to endangered killer whales to inform effective recovery plans
- 负责人：
- 关键词：
- Risk assessment;Anthropocene;endangered species;population viability analysis;Vortex;Orcinus orca
- DOI：
- doi:10.5061/dryad.46vq7
- 摘要：
- Understanding cumulative effects of multiple threats is key to guiding effective management to conserve endangered species. The critically endangered, Southern Resident killer whale population of the northeastern Pacific Ocean provides a data-rich case to explore anthropogenic threats on population viability. Primary threats include: limitation of preferred prey, Chinook salmon; anthropogenic noise and disturbance, which reduce foraging efficiency; and high levels of stored contaminants, including PCBs. We constructed a population viability analysis to explore possible demographic trajectories and the relative importance of anthropogenic stressors. The population is fragile, with no growth projected under current conditions, and decline expected if new or increased threats are imposed. Improvements in fecundity and calf survival are needed to reach a conservation objective of 2.3% annual population growth. Prey limitation is the most important factor affecting population growth. However, to meet recovery targets through prey management alone, Chinook abundance would have to be sustained near the highest levels since the 1970s. The most optimistic mitigation of noise and contaminants would make the difference between a declining and increasing population, but would be insufficient to reach recovery targets. Reducing acoustic disturbance by 50% combined with increasing Chinook by 15% would allow the population to reach 2.3% growth.
Data from: Genome-wide SNP data suggests complex ancestry of sympatric North Pacific killer whale ecotypes
- 负责人：
- DOI：
- doi:10.5061/dryad.803q8
- 摘要：
- ween the populations sampled here. Our results indicate that because of ancestral admixture events and incomplete lineage sorting, a single bifurcating tree doe
Data from: Here and there, but not everywhere: repeated loss of uncoupling protein 1 in amniotes
- 负责人：
- DOI：
- doi:10.5061/dryad.934fg
- 摘要：
- (dolphin, orca) and potentially Xenarthra (sloth, armadillo) and Afrotheria (hyrax). These lineages provide models for investigating alternate mechanisms
