Can Mating Systems Affect Local Extinction Risks? Two Examples of Lek-Breeding Waders

Höglund, Jacob

doi:10.2307/3546056

Cited by 17 publications

(11 citation statements)

References 15 publications

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“…Introducing fledglings using the criterion of decreasing local abundance could help to avoid Allee-like effects induced by the lekking mating system of little bustards, because member individuals disperse whenever the total abundance becomes very low (Höglund, 1996;Alonso et al, 2000;Morales et al, 2000;Dale, 2001). In the case of the little bustard, the abandonment of the leks and the effective halt of reproduction occur once the local lek size becomes smaller than six individuals (pers.…”

Section: The Reinforcement Of Little Bustard Populations In South-wesmentioning

confidence: 97%

Modelling population reinforcement at a large spatial scale as a conservation strategy for the declining little bustard (Tetrax tetrax) in agricultural habitats

Bretagnolle

Inchausti

2005

Animal Conservation

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International audienceThe little bustard (Tetrax tetrax) has declined rapidly across European farmland landscapes due to agricultural intensification. In France, the number of breeding males in agricultural habitats has been reduced by 92% over the last 20 years as a result of decreases in insect abundance and nest destruction during harvesting. An ageand sex-structured stochastic metapopulation model was formulated for the remaining little bustard population in south-west France and, using actual estimates of demographic rates obtained after 1997, its extinction risk over the next 30 years was estimated to be ca. 0.48. Limited population reinforcement has thus appeared as a potential conservation strategy for this species in agricultural habitats, while agro-environmental actions have begun to have an effect on habitat quality at the landscape level. Different strategies for the reinforcement of fledglings, including the number and frequency of releases and the number of release localities in relation to four criteria for choosing the release points, were evaluated in terms of their effect in reducing the extinction risk of local populations and of the metapopulation. The reinforcement of 100 fledglings per year for 5 years and choosing the actual release points using the current abundance were found to be the optimal choices for reducing the estimated extinction risk of the remaining little bustard population in south-west France

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Section: The Reinforcement Of Little Bustard Populations In South-wesmentioning

confidence: 97%

Modelling population reinforcement at a large spatial scale as a conservation strategy for the declining little bustard (Tetrax tetrax) in agricultural habitats

Bretagnolle

Inchausti

2005

Animal Conservation

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“…Loss of genetic diversity is increased in small populations (Frankham 2005;Höglund 2009). Thus, the risk of extinction is higher for lekking populations compared to equally sized non-lekking populations where matings are more evenly distributed (Höglund 1996).…”

Section: Introductionmentioning

confidence: 99%

Genetic variation in Black Grouse populations with different lekking systems in the Czech Republic

2010

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Here, we describe genetic diversity of lekking and non-lekking populations of Black Grouse Tetrao tetrix in the mountains bordering the Czech Republic. In total, 250 individuals from eight lekking and eight non-lekking study sites were genotyped at 11 microsatellite loci. Significant pair-wise F ST values between the different regions indicated low dispersal between localities, and birds could be assigned to three main mountain ranges (Š umava Mts, Krkonoše Mts and Krušné Mts). We found lower genetic diversity at study sites with solitary displaying males compared to sites where birds aggregate at leks. Additionally, genetic diversity was significantly more strongly associated with type of display than with spatial location of the sites. Given that lekking behaviour may be related to population density, we suggest that a shift from lekking to solitary displaying males is an alarming sign for conservationists indicating decreasing effective population sizes and declining populations.

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“…The ruff is a lekking species (Hogan-Warburg 1966;Widemo 1998) in which males and females differ not only by size but also by their ecology and migratory behaviour (van Rhijn 1991). The demographic processes and density-dependent processes relative to the spatiotemporal distributions of the two sexes are important determinants of their population dynamics (van Rhijn 1991;Höglund 1996;Anthony and Blumstein 2000;Gascoigne et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Apparent annual survival of staging ruffs during a period of population decline: insights from sex and site‐use related differences

et al. 2015

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The ruff Philomachus pugnax, a lekking shorebird wintering in Africa and breeding across northern Eurasia, declined severely in its western range. Based on a capture-mark-resighting programme (2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011) in the westernmost staging area in Friesland (the Netherlands), we investigated changes in apparent annual survival in relation to age and sex to explore potential causes of decline. We also related temporal variation in apparent survival to environmental factors. We used the CaptureMark-Recapture multievent statistical framework to overcome biases in survival estimates after testing for hidden heterogeneity of detection. This enabled the estimation of the probability to belong to high or low detectability classes. Apparent survival varied between years but was not related to weather patterns along the flyway, or to flood levels in the Sahel. Over time, a decline in apparent survival is suggested. Due to a short data series and flag loss in the last period this cannot be verified. Nevertheless, the patterns in sex-specific detectability and survival lead to new biological insights. Among highly detectable birds, supposedly most reliant on Friesland, males survived better than females ( / HDmales = 0.74, range 0.51-0.93; / HDfemales = 0.51, range 0.24-0.81). Among low detectable birds, the pattern is reversed ( / LDmales = 0.64, range 0.37-0.89; / LDfemales = 0.73, range 0.48-0.93). Probably the staging population contains a mixture of sexspecific migration strategies. A loss of staging females could greatly affect the dynamics of the western ruff population. Further unravelling of these population processes requires geographically extended demographic monitoring and the use of tracking devices.

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Can Mating Systems Affect Local Extinction Risks? Two Examples of Lek-Breeding Waders

Cited by 17 publications

References 15 publications

Modelling population reinforcement at a large spatial scale as a conservation strategy for the declining little bustard (Tetrax tetrax) in agricultural habitats

Modelling population reinforcement at a large spatial scale as a conservation strategy for the declining little bustard (Tetrax tetrax) in agricultural habitats

Genetic variation in Black Grouse populations with different lekking systems in the Czech Republic

Apparent annual survival of staging ruffs during a period of population decline: insights from sex and site‐use related differences

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