Simulating the response of a threatened amphibian to climate-induced reductions in breeding habitat

Mims, Meryl C.; Drake, Joseph; Lawler, Joshua J.; Olden, Julian D.

doi:10.1007/s10980-023-01599-w

Cited by 6 publications

(3 citation statements)

References 71 publications

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“…Assessing the extent of anthropogenic development and various road classifications on road use and roadkill of animals facilitates our understanding of the subtle changes in biodiversity across an urban–rural gradient. This is important in areas affected by climate change, where increasing urbanization can necessitate greater demands on natural resources [ 55 , 57 , 58 ]. Anthropogenic development and climate may already be affecting arthropod communities at urban edges in the Sonoran Desert [ 30 ].…”

Section: Discussionmentioning

confidence: 99%

“…To better understand the factors associated with road use and roadkill of aridland wildlife, we conducted temporally replicated post-sunset road-cruise surveys along secondary roads in the wildland-urban interface in the Sonoran Desert ecoregion of Arizona, USA. This aridland system is experiencing both rapid and gradual effects of climate change [55][56][57][58], and roads in both urban and rural areas have adversely impacted vertebrate populations [34,35,[59][60][61]. In addition to adding baseline data of road usage by vertebrates along rural and rural-urban edges, our objectives were to (i) compare rates and frequencies of alive to dead detections on roads for four taxonomic groups of terrestrial vertebrates; (ii) model anthropogenic, environmental and temporal factors influencing and leading to vertebrate roadkill; and (iii) assess how anthropogenic development and traffic relate to abundance of observations, which can proxy signals of prior high-mortality events and biodiversity changes [37,62,63].…”

Section: Introductionmentioning

confidence: 99%

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Anthropogenic, environmental and temporal associations with vertebrate road mortality in a wildland–urban interface of a biodiverse desert ecoregion

Blais,

Shaw,

Brocka

et al. 2024

R. Soc. Open Sci.

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Road mortality adversely affects wildlife populations. As urbanization and infrastructure densities expand, transportation and wildlife management aim to mitigate wildlife–vehicle conflicts while conserving biodiversity. Roadways in aridland ecosystems can invariably and adversely impact wildlife differently from temperate and other biomes, yet these rapidly urbanizing regions are understudied as are urban–rural gradients. We conducted road-cruise surveys ( n = 204; 2018–2023) to assess anthropogenic, environmental, and temporal factors associated with vertebrate roadkill across the wildland–urban interface of Arizona’s biodiverse Sonoran Desert ecoregion—already subjected to increased human development and climate change. Of n = 2019 vertebrates observed, 28.5% were roadkill. Increasing urbanization levels were associated with reduced vertebrate abundance on roads and increased road-killed endothermic vertebrates. Traffic volume was strongly associated with reduced vertebrate abundance and increased roadkill; additive effects on roadkill began at approximately 20 vehicles. Daily low temperature and/or relative humidity were also associated with roadkill across vertebrate groups. We provide empirical evidence to understand wildlife–roadkill associations across expanding wildland–urban interfaces to inform effective roadkill mitigation and wildlife conservation management strategies in biodiverse aridland regions. We recommend that managers mitigate or avoid development in rural areas that possess high biodiversity, valuable waterways or migration corridors, and populations of vulnerable species.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anthropogenic, environmental and temporal associations with vertebrate road mortality in a wildland–urban interface of a biodiverse desert ecoregion

Blais,

Shaw,

Brocka

et al. 2024

R. Soc. Open Sci.

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“…Certain taxa have been reported as being more exposed to extinction risk than others due to a variety of pressures [1,3]. One such taxon is the Amphibians, having experienced high extinction rates globally due to a range of factors [4,5], such as climate and habitat change [6], chytrids [7], and overharvesting [8], to name a few.…”

Section: Introductionmentioning

confidence: 99%

Malagasy Amphibian Wildlife Trade Revisited: Improving Management Knowledge of the Trade

Carpenter

Andreone

2023

Animals

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Madagascar is a biodiversity hotspot with a long history of trading in its wildlife, especially its hyper-diverse amphibian taxa. Due to globally raised concerns over the conservation of harvested species, CITES was introduced as a global mechanism with which to monitor and regulate the trade. Utilising data collated from the CITES Trade database, this study sought to investigate the trade and CITES’ effectiveness in managing the trade with respect to Madagascar. Over a 28-year period, 20 known amphibian species were exported from Madagascar, constituting a total of nearly 271,000 individuals. Formal descriptions of Malagasy amphibian species have increased and continue to increase greatly over time. However, there was no longitudinal relationship regarding the numbers of individuals traded as new species were described. Overall, the number of individuals traded has declined over time, but where assessments were provided by the IUCN Redlist, population declines were reported in all but one species of Malagasy amphibian. Mantella (97.5%) continues to be the predominantly traded genus, with certain, high-conservation-concern, species continuing to be traded. Despite initial concerns over the effectiveness of CITES’s actions, after concerted efforts, it appears that CITES’ actions were having positive impacts on regulating the trade. However, going forward, concerns remain over the appropriateness of the quotas set and the robustness of their underpinning NDFs. Furthermore, with the increase in the number of recognised species, the potential for incorrect species labelling on the CITES permits increases and requires greater attention.

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Sampling through space and time: multi-year analysis reveals dynamic population genetic patterns for an amphibian metapopulation

Moore,

Mims

2024

Conserv Genet

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Metapopulations are dynamic, and population genetics can reveal both spatial and temporal metapopulation variation. Yet, population genetic studies often focus on samples collected within a single time period or combine samples taken across time periods due to limited resources and the assumption that these approaches capture patterns and processes occurring over decadal and longer temporal scales. However, this may leave important fine-scale temporal variation in genetic composition undetected, particularly for metapopulations in which dynamic populations are expected. We investigated temporal patterns of population genetic diversity, effective population size, and differentiation across three sample periods for a dryland amphibian metapopulation. We sampled nine distinct Arizona treefrog (Hyla (Dryophytes) wrightorum) breeding ponds in 2014, 2018/2019, and 2021 and genotyped 17 microsatellite loci to quantify spatial and temporal population genetic dynamics. Genetic diversity within and between populations varied significantly among years. Most notably, we identified a concerning decline in allelic richness across populations, with an average − 26.11% difference between a population’s first and last sample period. Effective population sizes were generally small (Ne < 100) and variable within and among populations over time, with many populations falling below common conservation thresholds by the final sample period. Trends in global genetic diversity, as measured by heterozygosity, and population differentiation were relatively consistent across all sampling periods. Overall, we found that “snapshot” or single-time sampling approaches may miss temporal variability in genetic composition that has important conservation implications, including early warning signs of decline in genetic diversity.

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Simulating the response of a threatened amphibian to climate-induced reductions in breeding habitat

Cited by 6 publications

References 71 publications

Anthropogenic, environmental and temporal associations with vertebrate road mortality in a wildland–urban interface of a biodiverse desert ecoregion

Anthropogenic, environmental and temporal associations with vertebrate road mortality in a wildland–urban interface of a biodiverse desert ecoregion

Malagasy Amphibian Wildlife Trade Revisited: Improving Management Knowledge of the Trade

Sampling through space and time: multi-year analysis reveals dynamic population genetic patterns for an amphibian metapopulation

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