Genetic distinctiveness of Masked Booby (<i>Sula dactylatra)</i>on Bedout Island, Western Australia

Kingsley,; Lavers, Jennifer L.; Te, Steeves; Burridge, Christopher P.

doi:10.1080/01584197.2019.1663125

Emu - Austral Ornithology

2019

DOI: 10.1080/01584197.2019.1663125

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Genetic distinctiveness of Masked Booby (Sula dactylatra)on Bedout Island, Western Australia

Kingsley Kingsley

Jennifer L. Lavers

Steeves Te

et al.

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2024

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Cited by 2 publications

References 22 publications

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Cyclone Ilsa in April 2023 led to significant seabird mortality on Bedout Island

Lavers,

Mead,

Fidler

et al. 2024

Commun Earth Environ

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On 13 April 2023, Cyclone Ilsa crossed Bedout Island in the Timor Sea off Western Australia’s remote north coast. Extensive damage was done to the entire island, with all coastal vegetation stripped clear from the island’s surface. Here we use repeated aerial and ground-based transect surveys of Bedout’s important seabird populations during 17 April – 21 July 2023 and Monte Carlo modelling to estimate total mortality for three species. We estimate that 80–90% of the populations of three seabird species (Masked Booby Sula dactylatra bedouti, Brown Booby S. leucogaster, and Lesser Frigatebird Fregata ariel) were killed in the storm, with only 40 breeding Masked Booby (a putative endemic subspecies) recorded on the island 15 weeks later. The frequency and intensity of such storms is likely approaching a threshold beyond which Bedout’s seabirds cannot readily recover, with cyclones hitting the island, on average, every seven years in recent decades. We discuss the implications for Bedout Island, and for wildlife conservation more broadly in the face of increasing, climate-driven storms and impacts documented worldwide.

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Cyclone Ilsa in April 2023 led to significant seabird mortality on Bedout Island

Lavers,

Mead,

Fidler

et al. 2024

Commun Earth Environ

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Role of environmental factors in the genetic structure of a highly mobile seabird

Muraro,

Mazzochi,

Fregonezi

et al. 2024

Journal of Biogeography

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AimEnvironmental features can act as selection pressures and barriers to gene flow between populations. The genetic structuring of highly mobile but philopatric seabirds creates a paradox, and the role of oceanographic and geographic variables is still poorly understood. In this study, we investigate the influence of environmental and geographic variables in the genetic and phenotypic diversity of a pantropical seabird breeding in islands and archipelagos separated by different geographic distances, up to thousand kilometres, and which differ in environmental characteristics.LocationIslands and archipelagos in the southwestern (SW) Atlantic Ocean.TaxonSula dactylatra, Lesson, 1831 (masked booby).MethodsThe population structure of the species was accessed through mitochondrial and nuclear DNA. To test Isolation by Environment (IBE) versus by Distance (IBD), sea surface temperature, primary productivity and salinity, as well as isotopic niche based on carbon and nitrogen, and distances between colonies and from the continent, were used. We also tested the correlation between the genetic structure and the morphometry of individuals in each colony.ResultsWe uncover the presence of low genetic structure between populations. Nevertheless, differences were identified between inshore and offshore colonies, with the influence of landscape characteristics of these two types of environment. The morphometric and isotopic niche variations are consistent with this segregation.Main ConclusionsEnvironmental variables of coastal and oceanic environments seem to influence the genetic structure of masked boobies, even though it is low in the SW Atlantic Ocean, highlighting the role of environmental heterogeneity in shaping biodiversity.

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Genetic distinctiveness of Masked Booby (Sula dactylatra)on Bedout Island, Western Australia

Cited by 2 publications

References 22 publications

Cyclone Ilsa in April 2023 led to significant seabird mortality on Bedout Island

Cyclone Ilsa in April 2023 led to significant seabird mortality on Bedout Island

Role of environmental factors in the genetic structure of a highly mobile seabird

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