Planning and implementing genetic rescue of an endangered freshwater fish population in a regulated river, where low flow reduces breeding opportunities and may trigger inbreeding depression

Evolutionary Applications, Год журнала: 2024, Номер 17(4)

Опубликована: Апрель 1, 2024

Abstract Augmenting depleted genetic diversity can improve the fitness and evolutionary potential of wildlife populations, but developing effective management approaches requires genetically monitored test cases. One such case is small, isolated inbred Cotter River population an endangered Australian freshwater fish, Macquarie perch Macquaria australasica , which over 3 years (2017–2019) received 71 translocated migrants from a closely related, more diverse population. We used monitoring to whether immigrants bred, interbred with local fish augmented diversity. also investigated levels river flow affected recruitment, inbreeding depression juvenile dispersal. Fish length was estimate age, birth year cohort growth 524 individuals born between 2016 2020 under variable conditions. DArT genome‐wide genotypes were assess individual ancestry, heterozygosity, short‐term size identify parent‐offspring full‐sibling families. Of 442 after translocations commenced, only two (0.45%) mixed ancestry; these half‐sibs one parent in common. Numbers breeders for five cohorts low, especially low‐flow years. Additionally, lowest evidently suffered growth. The highest associated largest number breeders, offspring greatest dispersal distances. Genetic decreased upstream direction, flagging restricted access most breeding sites, exacerbated by low flow. Our results suggest that effectiveness could be increased focussing on sites moving per year; using riverine sources should considered. indicate sufficient facilitate movement through system would increase promote individuals' growth, reduce rescue.

Язык: Английский

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Weaving place‐based knowledge for culturally significant species in the age of genomics: Looking to the past to navigate the future

Evolutionary Applications, Год журнала: 2022, Номер 15(5), С. 751 - 772

Опубликована: Март 3, 2022

Relationships with place provide critical context for characterizing biocultural diversity. Yet, genetic and genomic studies are rarely informed by Indigenous or local knowledge, processes, practices, including the movement of culturally significant species. Here, we show how place-based knowledge can better reveal complexities data derived from As a case study, focus on southern freshwater kōura (crayfish) in Aotearoa me Te Waipounamu (New Zealand, herein NZ). Our results, based genotyping-by-sequencing markers, strong population structure along signatures admixture 19 genetically depauperate populations across east coast Waipounamu. Environment association differentiation analyses adaptation also indicate role hydroclimatic variables-including temperature, precipitation, water flow regimes-in shaping kōura. Through trusted partnerships between community researchers, weaving markers has both provided invaluable interpretation created opportunities to reconnect people place. We envisage such guiding future research species NZ beyond.

Язык: Английский

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Conservation translocation immediately reverses decline in imperiled sage-grouse populations

Biological Conservation, Год журнала: 2025, Номер 304, С. 110986 - 110986

Опубликована: Фев. 20, 2025

Язык: Английский

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Adaptive Genetic Management of a Reintroduction Program from Captive Breeding to Metapopulation Management of an Arboreal Marsupial

Diversity, Год журнала: 2023, Номер 15(7), С. 848 - 848

Опубликована: Июль 12, 2023

The application of genetic data to conservation management programs can be hindered by the mismatch in timelines for decisions and acquisition data, particularly genomic sequence that may require outsourcing. While applying principles where are absent provide general guidelines actions, often fine-tune actions through adaptive management. We describe establishment a metapopulation small arboreal marsupial, red-tailed phascogale (Phascogale calura). Two captive breeding were established as source populations, with applied first program empirical used guide second program. Genetic from both then allocate founders three new populations create diversity within among sites. Building maintaining metapopulations when recovering threatened species will reduce pressure on original increase resilience species.

Язык: Английский

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Return to 1616: Multispecies Fauna Reconstruction Requires Thinking Outside the Box

Animals, Год журнала: 2023, Номер 13(17), С. 2762 - 2762

Опубликована: Авг. 30, 2023

Conservation translocations have become increasingly popular for 'rewilding' areas that lost their native fauna. These multispecies are complex and need to consider the requirements of each individual species as well influence likely interactions among them. The Dirk Hartog Island National Park Ecological Restoration Project, Return 1616, aspires restore ecological function Western Australia's largest island. Since 2012, pest animals been eradicated, conservation seven fauna undertaken, with a further six planned. Here, we present synthesis innovative approaches undertaken in restoring former faunal assemblage key learnings gathered project has progressed.

Язык: Английский

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An a priori assessment of the impact of harvesting from five wild populations for conservation translocations

Ibis, Год журнала: 2024, Номер 166(4), С. 1280 - 1295

Опубликована: Март 19, 2024

Given the frequency with which translocation is implemented as a conservation tool, remarkably little research has assessed sustainable management of source populations. We sought to make an priori estimate impact multiple alternative harvesting scenarios on five passerine species endemic Norfolk Island may benefit from future translocation. Population parameters for our focal taxa were quantified using distance sampling at 298 point surveys conducted in 2019. Intensive nest monitoring between 2018 and 2020 was used reproductive rates. modelled population trajectories all under forward projections over 25‐year period assess likelihood that populations could recover event. sensitivity analysis robustness models uncertainty around some parameters. National Park supported 1486 Robins Petroica multicolor (95% confidence interval (CI) 1017–1954), 7184 Slender‐billed White‐eyes Zosterops tenuirostris CI 5817–8551), 2970 Grey Fantails Rhipidura albiscapa pelzini 2094–3846), 3676 Gerygones Gerygone modesta 2869–4482) 1671 Golden Whistlers Pachycephala pectoralis xanthoprocta 1084–2259) All predicted harvest 50, 100 or 150 individuals within 10 years. Despite considerable variation parameters, we demonstrate have potential sustain rates required translocations. provide clear comparison differing intensity strategies on‐ground managers. More broadly, rare example assessment

Язык: Английский

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Updated vital rate estimates for the endangered Hawaiian Common Gallinule (Gallinula galeata sandvicensis)

The Wilson Journal of Ornithology, Год журнала: 2024, Номер 136(1)

Опубликована: Апрель 24, 2024

Язык: Английский

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Small translocations of endangered Gallinula galeata sandvicensis (Hawaiian Common Gallinule) may be sufficient to generate a viable reintroduced population

Ornithological Applications, Год журнала: 2024, Номер 126(3)

Опубликована: Июнь 7, 2024

Abstract Where stable source populations of at-risk species exist, translocation may be a reasonable strategy for re-establishing extirpated populations. However, the success rates such efforts are mixed, necessitating thorough preliminary investigation. Stochastic population modeling can useful method assessing potential translocations. Here, we report on results Gallinula galeata sandvicensis or ‘alae ‘ula (Hawaiian Common Gallinule), an endangered waterbird endemic to Hawaiian Islands. Using updated vital rates, constructed model simulating 3 existing extant (wild) and hypothetical recipient site another island. We then projected effects 6 different scenarios sensitivity variation three important demographic parameters probability extinction (PE) reintroduced donor Larger translocations, at least 30 birds, had low in population, but raised risk smallest population. Spacing out translocations time (e.g., 10 birds translocated total installments over 9 years), led lower PE than translocating all individuals once (i.e., bulk translocations) both Brood size hatch-year juvenile survival disproportionate impact viability. Importantly, reported rate is very near threshold failure. This suggests that post-introduction subsequent management wetlands, particularly predator control, could critical reintroduction success. recommend should from multiple, genetically distinct subpopulations reduce possibility inbreeding depression. Based this analysis, wetland sufficiently large it support 25 pairs gallinules. recent estimates densities O‘ahu, would need between 3.75 74.6 ha.

Язык: Английский

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Wildlife restoration in fragmented landscapes: Trialling wild-to-wild translocation with two common reptiles

Biological Conservation, Год журнала: 2024, Номер 299, С. 110780 - 110780

Опубликована: Сен. 13, 2024

Язык: Английский

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Comparing estimates of census and effective population size in an endangered amphibian

Animal Conservation, Год журнала: 2023, Номер 26(6), С. 839 - 850

Опубликована: Март 28, 2023

Abstract The field of conservation has seen a shift in focus from monitoring trends census population size to ‘effective’ size. Numerous genetic methods exist for estimating effective size, resulting uncertainty among practitioners as which are most appropriate when conducting assessments or evaluating recovery efforts. Demographic approaches offer promising avenue provide link between and using life‐history information, but rarely do studies have all three sources data (genetic, demographic, life history) necessary perform an explicit evaluation their performance. Using long‐term study reticulated flatwoods salamanders ( Ambystoma bishopi ) western Florida, USA, we assessed the magnitude temporal variation sizes number breeders two breeding populations (1) document changes adults over 9‐year duration, (2) determine whether similar information about (3) compare alternative demographic . We found that estimates , particularly if averaged across multiple estimation methods, closely tracked spatiotemporal also were sensitive assumed variance reproductive success. In absence detailed knowledge mating systems environmental factors skew contributions appear reliably inform management decisions. these populations, appears too small (<40 individuals) confer resilience, highlighting importance restoring landscape connectivity indicating caution must be taken sourcing animals reintroduction More generally, our reveals insights into utility guiding efforts threatened endangered species.

Язык: Английский

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