Effective number of breeding adults in Oregon spotted frogs (Rana pretiosa): genetic estimates at two life stages

Phillipsen, Ivan C.; Bowerman, Jay; Blouin, Michael S.

doi:10.1007/s10592-009-9862-8

Cited by 13 publications

(13 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Regardless, we demonstrate how managers can evaluate the influence of such uncertainties on reintroduction strategies using decision-support models and optimization procedures. Our estimated fecundity parameter did not support a one-to-one relationship between adult female abundance and egg mass counts in some years, which is contrary to the findings of Phillipsen et al (2008). We suspect the lack of a one-to-one relationship between adult females and egg masses in some years has to do with the temporal mismatch in our monitoring data.…”

Section: Modelcontrasting

confidence: 99%

“…Our estimated fecundity parameter did not support a one-to-one relationship between adult female abundance and egg mass counts in some years, which is contrary to the findings of Phillipsen et al (2008). We assumed immigration into the population was negligible, but the metamorph survival estimate will be biased high if immigration into the population is extensive.…”

Section: Modelcontrasting

confidence: 99%

See 1 more Smart Citation

A new parameterization for integrated population models to document amphibian reintroductions

Duarte

Pearl

Adams

et al. 2017

Ecological Applications

View full text Add to dashboard Cite

Managers are increasingly implementing reintroduction programs as part of a global effort to alleviate amphibian declines. Given uncertainty in factors affecting populations and a need to make recurring decisions to achieve objectives, adaptive management is a useful component of these efforts. A major impediment to the estimation of demographic rates often used to parameterize and refine decision-support models is that life-stage-specific monitoring data are frequently sparse for amphibians. We developed a new parameterization for integrated population models to match the ecology of amphibians and capitalize on relatively inexpensive monitoring data to document amphibian reintroductions. We evaluate the capability of this model by fitting it to Oregon spotted frog (Rana pretiosa) monitoring data collected from 2007 to 2014 following their reintroduction within the Klamath Basin, Oregon, USA. The number of egg masses encountered and the estimated adult and metamorph abundances generally increased following reintroduction. We found that survival probability from egg to metamorph ranged from 0.01 in 2008 to 0.09 in 2009 and was not related to minimum spring temperatures, metamorph survival probability ranged from 0.13 in 2010-2011 to 0.86 in 2012-2013 and was positively related to mean monthly temperatures (logit-scale slope = 2.37), adult survival probability was lower for founders (0.40) than individuals recruited after reintroduction (0.56), and the mean number of egg masses per adult female was 0.74. Our study is the first to test hypotheses concerning Oregon spotted frog egg-to-metamorph and metamorph-to-adult transition probabilities in the wild and document their response at multiple life stages following reintroduction. Furthermore, we provide an example to illustrate how the structure of our integrated population model serves as a useful foundation for amphibian decision-support models within adaptive management programs. The integration of multiple, but related, data sets has an advantage of being able to estimate complex ecological relationships across multiple life stages, offering a modeling framework that accommodates uncertainty, enforces parsimony, and ensures all model parameters can be confronted with monitoring data.

show abstract

Section: Modelcontrasting

confidence: 99%

Section: Modelcontrasting

confidence: 99%

A new parameterization for integrated population models to document amphibian reintroductions

Duarte

Pearl

Adams

et al. 2017

Ecological Applications

View full text Add to dashboard Cite

show abstract

“…In our P. perezi population, we obtained an N b / N a ratio of 0.5 (Table ). This value is within the range reported for other ranid frogs (Brede & Beebee, ; Ficetola, Padoa‐Schioppa, Wang, & Garner, ; Phillipsen et al., ; Schmeller & Merilä, ), although this is the first study integrating both SF estimates of N b and CMR estimates of N a . In H. molleri , only the number of adult males (126) could be estimated (Table , Figure ), so we could not calculate the N b / N a ratio in this species.…”

Section: Discussionsupporting

confidence: 88%

Reliable effective number of breeders/adult census size ratios in seasonal‐breeding species: Opportunity for integrative demographic inferences based on capture–mark–recapture data and multilocus genotypes

Sánchez‐Montes

Wang

Ariño

et al. 2017

Ecology and Evolution

View full text Add to dashboard Cite

The ratio of the effective number of breeders (N b) to the adult census size (N a), N b/N a, approximates the departure from the standard capacity of a population to maintain genetic diversity in one reproductive season. This information is relevant for assessing population status, understanding evolutionary processes operating at local scales, and unraveling how life‐history traits affect these processes. However, our knowledge on N b/N a ratios in nature is limited because estimation of both parameters is challenging. The sibship frequency (SF) method is adequate for reliable N b estimation because it is based on sibship and parentage reconstruction from genetic marker data, thereby providing demographic inferences that can be compared with field‐based information. In addition, capture–mark–recapture (CMR) robust design methods are well suited for N a estimation in seasonal‐breeding species. We used tadpole genotypes of three pond‐breeding amphibian species (Epidalea calamita, Hyla molleri, and Pelophylax perezi, n = 73–96 single‐cohort tadpoles/species genotyped at 15–17 microsatellite loci) and candidate parental genotypes (n = 94–300 adults/species) to estimate N b by the SF method. To assess the reliability of N b estimates, we compared sibship and parentage inferences with field‐based information and checked for the convergence of results in replicated subsampled analyses. Finally, we used CMR data from a 6‐year monitoring program to estimate annual N a in the three species and calculate the N b/N a ratio. Reliable ratios were obtained for E. calamita (N b/N a = 0.18–0.28) and P. perezi (0.5), but in H. molleri, N a could not be estimated and genetic information proved insufficient for reliable N b estimation. Integrative demographic studies taking full advantage of SF and CMR methods can provide accurate estimates of the N b/N a ratio in seasonal‐breeding species. Importantly, the SF method provides results that can be readily evaluated for reliability. This represents a good opportunity for obtaining robust demographic inferences with wide applications for evolutionary and conservation research.

show abstract

“…Different estimators of N e (LD, ABC, SA, and TM) gave fairly similar results for many of these frog populations, and our estimates are similar to those from other published studies of N e in ranid frogs (Zeisset and Beebee 2003;Brede and Beebee 2006;Schmeller and Merila 2007;Ficetola et al 2010;Phillipsen et al 2009). Thus, there is no evidence to suggest that our single-sample estimates are strongly biased upwards or downwards.…”

Section: Discussionsupporting

confidence: 88%

Comparative Analyses of Effective Population Size Within and Among Species: Ranid Frogs as a Case Study

et al. 2011

Self Cite

View full text Add to dashboard Cite

A key parameter in the theory and application of population genetics is the effective population size (N e ): the number of breeding individuals in a conceptual, ideal population that would lose genetic diversity at the same rate as the real population being studied (Wright 1931;Charlesworth 2009). How a population responds to evolutionary forces depends on N e , rather than the actual number of individuals in the population (N, the census population size). Although direct estimates of N e can be calculated from demographic data, such data are often prohibitively difficult to obtain (Wang 2005). Given this limitation, and the importance of N e in population and conservation genetics, it is not surprising that considerable effort has been put into developing methods of using molecular genetic data to obtain indirect estimates of N e .With advances in these methods and with the increasing accessibility of multilocus genotype data, it has recently become practicable to estimate the effective sizes of many populations of the same species (Luikart et al. 2010;Waples and Do, 2010). Such an effort is highly worthwhile for a couple of reasons. First, by gathering estimates from multiple populations, investigators might identify a reasonably narrow range of typical N e values for a species, an "educated guess" for the value of this parameter in any given population. This information could be used to approximate N e in evolutionary modeling of the species. For example, an expected N e could be used as input for simulations of evolutionary processes or as a Bayesian prior in analyses used to infer other population genetic parameters, such as migration rates or selection coefficients. Expected N e values for a species would also be useful in conservation and management, in situations in which an estimate of N e for a population is desired but genetic and demographic data are unavailable. In such cases, it would be helpful to know if populations of the focal species typically have, for example, N e estimates less than 100. Furthermore, when estimates of both N e and N (census size) can be obtained for multiple populations, it may be possible to identify the typical range of N e /N for the species. If so, estimates of N for the species might then be used as proxies for N e , when the former are easier to obtain that the latter.Second, a comparative analysis of N e estimates from multiple populations across more than one species can help generate hypotheses about what particular biological factors influence N e within species. Consistent differences in N e among species might correspond to differences in habitat, dispersal capabilities, or breeding behaviors. Hypotheses generated in a comparative analysis could then be tested in subsequent studies. Similarly, the factors that influence N e within species can also be investigated by evaluating correlations between environmental variables and N e for multiple populations of a species.Despite the fact that such multipopulation, empirical investigations of N e can lead to valuable...

show abstract

Effective number of breeding adults in Oregon spotted frogs (Rana pretiosa): genetic estimates at two life stages

Cited by 13 publications

References 36 publications

A new parameterization for integrated population models to document amphibian reintroductions

A new parameterization for integrated population models to document amphibian reintroductions

Reliable effective number of breeders/adult census size ratios in seasonal‐breeding species: Opportunity for integrative demographic inferences based on capture–mark–recapture data and multilocus genotypes

Comparative Analyses of Effective Population Size Within and Among Species: Ranid Frogs as a Case Study

Contact Info

Product

Resources

About