Close-kin mark-recapture informs critically endangered terrestrial mammal status

Article Fisheries

Close-kin methods to estimate census size and effective population size

Robin S. Waples et al.

Summary: Research has found that genetic methods and close-kin mark-recapture methods differ in estimating population size, but combining the two can provide a better assessment of both ecological and evolutionary processes.

FISH AND FISHERIES (2022)

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Article Ecology

Body-size dependent foraging strategies in the Christmas Island flying-fox: implications for seed and pollen dispersal within a threatened island ecosystem

Christopher M. Todd et al.

Summary: This study examined foraging behavior of the Critically Endangered Christmas Island flying-fox, finding that larger individuals spent more time foraging, traveled shorter distances, had smaller foraging ranges, and visited a lower diversity of floral resources. The study suggests that smaller individuals are the main vectors of long-distance pollen and seed dispersal in this species.

MOVEMENT ECOLOGY (2022)

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Article Multidisciplinary Sciences

Rapid assessment of adult abundance and demographic connectivity from juvenile kin pairs in a critically endangered species

Toby A. Patterson et al.

Summary: By using sibling pairs, the abundance and connectivity of adult sharks in two river systems in Australia were estimated. The results showed male philopatry in the Adelaide River and high connectivity of males in the Alligator Rivers with the Adelaide River. This method allows simultaneous assessment of abundance and connectivity in rare and threatened species.

SCIENCE ADVANCES (2022)

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Article Multidisciplinary Sciences

Low levels of sibship encourage use of larvae in western Atlantic bluefin tuna abundance estimation by close-kin mark-recapture

Jan R. McDowell et al.

Summary: Tunas are valuable and difficult to monitor fish stocks globally. Larval samples from standardized surveys in the northern Gulf of Mexico can be used for close-kin mark-recapture estimates of abundance. High throughput genomic profiling revealed full- and half-sibling relationships within and among larval tows, with a higher proportion of siblings in targeted sampling. The combined effective sample size across two years indicates that Gulf of Mexico larval collections can be a suitable source for close-kin mark-recapture in Western Atlantic bluefin tuna.

SCIENTIFIC REPORTS (2022)

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Article Environmental Sciences

Evidence of chronic cadmium exposure identified in the critically endangered Christmas Island flying-fox (Pteropus natalis)

Laura A. Pulscher et al.

Summary: The Christmas Island flying-fox population is declining and may be threatened by metal contamination from phosphate mining. Research found significantly higher cadmium concentrations in the flying-foxes compared to mainland Australia, with some individuals showing signs of renal dysfunction. Urinary iron concentrations in the flying-foxes were unexpectedly higher, suggesting a possible importance of iron excretion in this species with an iron-rich diet.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

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Article Ecology

Considering sampling bias in close-kin mark-recapture abundance estimates of Atlantic salmon

Sebastian Wacker et al.

Summary: Genetic methods, particularly Close-Kin Mark-Recapture (CKMR), can be effective alternatives in estimating population sizes. The study focused on evaluating CKMR for estimating spawner abundance in Atlantic salmon, revealing the impact of age, sex, spatial, and temporal sampling bias on estimates. Results showed that CKMR estimates were robust to bias after correction, offering a moderate sampling effort solution for estimating spawner abundance in Atlantic salmon populations.

ECOLOGY AND EVOLUTION (2021)

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Article Biochemistry & Molecular Biology

Nonlethal age estimation of three threatened fish species using DNA methylation: Australian lungfish, Murray cod and Mary River cod

Benjamin Mayne et al.

Summary: Age-based demography is crucial for wild fish population management. This study demonstrates the development and accuracy of epigenetic clocks using DNA methylation for age prediction in threatened freshwater fish species, highlighting the potential benefits for fisheries and wildlife management.

MOLECULAR ECOLOGY RESOURCES (2021)

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Article Multidisciplinary Sciences