Using ancient DNA to quantify losses of genetic and species diversity in seabirds: a case study of Pterodroma petrels from a Pacific island

Lombal, Anicee J.; Salis, Alexander T.; Tennyson, Alan J. D.; Shepherd, Lara D.; Worthy, Trevor H.; Woehler, Eric J.; Austin, Jeremy J.; Burridge, Christopher P.

doi:10.1007/s10531-020-01978-8

Cited by 3 publications

(3 citation statements)

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“…The lack of evidence for anthropogenic impact on the genetic diversity of red-tailed tropicbird colonies at impacted islands (in this study, Rapa Lombal et al, 2020;Ramírez et al, 2013). Nevertheless, these results should be viewed with caution when considering management actions because it is possible that red-tailed tropicbird breeding colonies within the regions have retained ancestral variation and experienced a recent process of divergence that was undetected using mitochondrial DNA sequences (see Friesen et al, 2007).…”

Section: Fine-scale Assessmentmentioning

confidence: 70%

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Genetic diversity, population structure, and historical demography of a highly vagile and human‐impacted seabird in the Pacific Ocean: The red‐tailed tropicbird, Phaethon rubricauda

Varela

Brokordt

Ismar-Rebitz

et al. 2020

Aquatic Conservation

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1. Many seabird breeding colonies have recovered from heavy anthropogenic disturbance after conservation actions. The widely distributed red-tailed tropicbird, Phaethon rubricauda, was used as a model species to assess potential anthropogenic impacts on the genetic diversity of breeding colonies in the Pacific Ocean. 2. Cytochrome c oxidase subunit I and control region sequences analyses were conducted across the range of the species in the Pacific Ocean. The study sites were at islands without human-related disturbance (non-impacted islands) and with human-related disturbance (impacted islands). We hypothesized that (i) breeding colonies of the red-tailed tropicbird on impacted islands have lower genetic diversity compared with colonies on non-impacted islands, and (ii) breeding colonies of the red-tailed tropicbird show significant fine and broad-scale genetic structure across the Pacific Ocean. Bayesian skyline analyses were conducted to infer past changes in population sizes. 3. Genetic diversity was similar between impacted and non-impacted islands. There was significant broad-scale genetic structure among colonies separated by over 6,000 km, but a lack of significant fine-scale genetic structure within Australasia and Hawai'i, although a significant level of differentiation was found within Chile with Φ ST analyses. Skyline analyses showed that effective population sizes

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Section: Fine-scale Assessmentmentioning

confidence: 70%

“…has prevented the loss of genetic diversity in human-impacted islands (e.g. Lombal et al, 2020;. Given all the above, we will investigate levels of genetic diversity and population differentiation using genome-wide single nucleotide polymorphisms (SNPs), across the same breeding colonies surveyed here.…”

Section: Fine-scale Assessmentmentioning

confidence: 99%

Genetic diversity, population structure, and historical demography of a highly vagile and human‐impacted seabird in the Pacific Ocean: The red‐tailed tropicbird, Phaethon rubricauda

Varela

Brokordt

Ismar-Rebitz

et al. 2020

Aquatic Conservation

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“…Considering the large collections of C. patera available in museums around the world due to the wanton harvesting in the nineteenth century, population genetic studies of C. patera specimens around the world can be performed to detect bottlenecks in the past 74 . This would shed more light on the detrimental effects that anthropogenic activities have on sponge populations 75 , 76 and potentially drive conservation efforts to limit overharvesting globally.…”

Section: Discussionmentioning

confidence: 99%

Low genetic diversity and predation threaten a rediscovered marine sponge

Quek

Jain

et al. 2022

Sci Rep

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Discovered in 1819 in the tropical waters off Singapore, the magnificent Neptune’s cup sponge Cliona patera (Hardwicke, 1820) was harvested for museums and collectors until it was presumed extinct worldwide for over a century since 1907. Recently in 2011, seven living individuals were rediscovered in Singapore with six relocated to a marine protected area in an effort to better monitor and protect the population, as well as to enhance external fertilisation success. To determine genetic diversity within the population, we sequenced the complete mitochondrial genomes and nuclear ribosomal DNA of these six individuals and found extremely limited variability in their genes. The low genetic diversity of this rediscovered population is confirmed by comparisons with close relatives of C. patera and could compromise the population’s ability to recover from environmental and anthropogenic pressures associated with the highly urbanised coastlines of Singapore. This lack of resilience is compounded by severe predation which has been shrinking sponge sizes by up to 5.6% every month. Recovery of this highly endangered population may require ex situ approaches and crossbreeding with other populations, which are also rare.

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