Population dynamics of an endangered forest bird using mark–recapture models based on DNA-tagging

Bañuelos, María-José; Blanco-Fontao, Beatriz; Fameli, Alberto; Fernández-Gil, Alberto; Mirol, Patricia M.; María, Morán-Luis; Rodríguez‐Muñoz, Rolando; Quevedo, Mario

doi:10.1007/s10592-019-01208-x

Cited by 8 publications

(16 citation statements)

References 87 publications

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“…The sex‐specific survival and recruitment parameter estimates suggested that female recruitment was higher than male recruitment, but male survival was higher than female survival. These results are consistent with those of a recent capercaillie study in Spain (Bañuelos et al, ) that found recruitment to be higher for females and survival higher for males. In principle, sex‐specific recruitment in our population could be the product of an imbalanced sex ratio at birth, sex specificity in asymmetric natal dispersal rates (e.g., more net influx or outflux of one sex due to immigration/emigration), and/or sex‐specific survival to adulthood.…”

Section: Discussionsupporting

confidence: 93%

“…While the current consensus is that capercaillie populations in Switzerland are declining, the evidence for this decline comes from data collected between 1968 and 2003 and from lek surveys that likely underestimated population sizes (Jacob et al, ). More recently, Mollet et al () used SCR to more reliably estimate density using genetic capture–recapture; however, virtually no estimates of population dynamics parameters in Switzerland are available and population dynamics estimates from anywhere in the capercaillie range are rare (but see Bañuelos et al, ).…”

Section: Methodsmentioning

confidence: 99%

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Sex‐specific population dynamics and demography of capercaillie (Tetrao urogallus L.) in a patchy environment

et al. 2019

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Modeling the population dynamics of patchily distributed species is a challenge, particularly when inference must be based on incomplete and small data sets such as those from most species of conservation concern. Here, we develop an open population spatial capture-recapture (SCR) model with sexspecific detection and population dynamics parameters to investigate population trend and sex-specific population dynamics of a capercaillie (Tetrao urogallus) population in Switzerland living in eight distinct forest patches totaling 22 km 2 within a region of 908 km 2 and sampled via scat collection. Our model accounts for the patchy distribution of habitat and the uncertainty introduced by collecting data only every third year, while producing sex by patch population trajectories. The estimated population trajectory was a decline of 2% per year; however, the sex specificity of the model revealed a decline in the male population only, with no evidence of decline in the female population. The decline observed in males was explained by the demography of just two of the eight patches. Our study highlights the flexibility of open population SCR models for assessing population trajectories through time and across space and emphasizes the desirability of estimating sex-stratified population trends especially in species of conservation concern. K E Y W O R D Sopen population, patchy habitat, population dynamics, spatial capture-recapture, Tetrao urogallus

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Section: Discussionsupporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Sex‐specific population dynamics and demography of capercaillie (Tetrao urogallus L.) in a patchy environment

et al. 2019

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“…Capercaillie gather at lekking areas in the mating season, thus making it more feasible to obtain sufficient droppings or feathers than at other times, when the birds are more dispersed and the habitat use of females and males is distinct (Bañuelos et al 2008). We visited areas including 62 previously known capercaillie leks during the mating seasons (mid-March to early June) of 2009, 2010 and 2011 (Morán-Luis et al 2014; Bañuelos et al 2019 for details). Those reference locations of leks derived in fact from the period of capercaillie hunting during the mating season, which extended for much of the 20 th century (Rodríguez-Muñoz et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

“…We studied movements of an endangered forest bird, Cantabrian capercaillie Tetrao urogallus cantabricus , living at the southern edge of the species range, under the influence of Atlantic climate (Olson et al 2001; Cervellini et al 2020). This capercaillie population declined severely from its known historical range in the last third of the 20th century (Pollo et al 2005; Storch et al 2006), and its viability appears compromised (Bañuelos et al 2019). It has been recently listed as critically endangered in Spain (Ministerio para la Transición Ecológica 2018).…”

Section: Introductionmentioning

confidence: 99%

Tracking movements of an endangered bird using mark-recapture based on DNA-tagging

Bañuelos

María

Mirol

et al. 2023

Preprint

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Knowing the location and movements of individuals at various temporal and spatial scales is an important facet of behaviour and ecology. In threatened populations, movements that would ensure adequate genetic flow and long term population viability are often challenged by habitat fragmentation. It is also in those endangered populations where capturing and handling individuals to equip them with transmitters or to obtain tissue samples may present additional logistical challenges. DNA-tagging, i.e. individual identification of samples obtained via non-invasive approaches, can reveal certain movement patterns. We used faecal material genetically assigned to individuals to indirectly track movements of a large-bodied, endangered forest bird, Cantabrian capercaillie (Tetrao urogallus cantabricus), for three consecutive mating seasons. We identified 127 individuals, and registered movements of 70 of them (22 females, 48 males). Most movements were relatively short for capercaillie, mostly concentrated around display areas. We did not find differences in movement distances between females and males within mating seasons, or between them. Several longer, inter-valley movements up to 9.9 km of planimetric distance linked distant display areas, showing that both females and males of Cantabrian capercaillie were able to move through the landscape, complementing previous studies on gene flow. Those longer movements may be taking birds outside of the study area, and into historical capercaillie territories, which still include substantial forest cover. Tracking animals via DNA tagging, particularly those on endangered populations, showed clear advantages like non-intrusiveness and potential for sample sizes much larger than via direct handling. However, it also misses out on direct observation and natural history, which would provide key information like social status and timing of movements.

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“…These approaches can also be combined with parentage analysis in a gametic-mark-recapture framework, where genotypes of individuals can be 'recaptured' in offspring to estimate both abundance and population connectivity (Carroll et al, 2012;Garrigue et al, 2004). These approaches are particularly useful for estimating the abundance of rare or cryptic species (i.e., from feathers, fur, or faeces; Bañuelos et al, 2019) and for species where photo-identification has limited applicability due to a low instance of natural markings and/or where tagging/banding is not possible (e.g., some cetacean species such as Hector's and Māui dolphins; Baker et al, 2013;Hamner et al, 2017;Hamner, Wade, et al, 2014).…”

Section: Dna Profilingmentioning

confidence: 99%

Current applications and future promise of genetic/genomic data for conservation in an Aotearoa New Zealand context

Forsdick¹,

Adams²,

Alexander³

et al. 2021

Preprint

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1.To achieve the vision outlined in the national strategy for biodiversity, Te Mana o te Taiao, we will need to unite diverse disciplines, including conservation genetics/genomics.2.As conservation genetic/genomic data generated for—and associated with—taonga (treasured) species is also taonga, we highlight the need for collaborative research partnerships that centre the needs, aspirations and expertise of mana whenua.3.As a team of predominantly early-career conservation genetics and genomics researchers working across institutions as Te Tiriti o Waitangi partners, each speaking to our own expertise, we review available and emerging tools in the conservation genetics/genomics toolbox.4.To support practitioners in identifying appropriate and affordable tools from the toolbox, we present a table that encompasses resource requirements (including finances, time, and skill) to assist conservation practitioners in assessing the associated costs and benefits of these tools for informing conservation management.5.To support researchers and practitioners in establishing long-lasting partnerships with mana whenua, we highlight key aspects of data management and data sovereignty for consideration.6.Intended as a platform to initiate discussion within and among conservation practitioners and researchers, mana whenua, and local communities, the development of government policies is beyond the scope of this contribution.7.To meet the vision of Te Mana o te Taiao, we conclude by calling for a transdisciplinary approach that includes conservation genetics/genomics.

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Population dynamics of an endangered forest bird using mark–recapture models based on DNA-tagging

Cited by 8 publications

References 87 publications

Sex‐specific population dynamics and demography of capercaillie (Tetrao urogallus L.) in a patchy environment

Sex‐specific population dynamics and demography of capercaillie (Tetrao urogallus L.) in a patchy environment

Tracking movements of an endangered bird using mark-recapture based on DNA-tagging

Current applications and future promise of genetic/genomic data for conservation in an Aotearoa New Zealand context

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