Movement of amphibians through agricultural landscapes: The role of habitat on edge permeability

Youngquist, Melissa B.; Boone, Michelle D.

doi:10.1016/j.biocon.2014.04.028

Cited by 46 publications

(32 citation statements)

References 46 publications

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“…Recent land-use changes and clearings of forested regions may have increased the functional landscape connectivity for some generalist open-habitat species (Youngquist and Boone 2014) which could have also benefited from novel breeding sites (Knutson et al 2004). If selection for increased dispersal capability and low site-fidelity occurs in openhabitat, then these species would advantageously exploit the newly-available habitat and show reduced phylogeographic structure (Chan and Zamudio 2009).…”

Section: Proximate Causes Of Population Divergencementioning

confidence: 99%

Genetic divergence in tropical anurans: deeper phylogeographic structure in forest specialists and in topographically complex regions

et al. 2015

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Many tropical organisms show large genetic differences among populations, yet the prevalent drivers of the underlying divergence processes are incompletely understood. We explored the effect of several habitat and natural history features (body size, macrohabitat, microhabitat, reproduction site, climatic heterogeneity, and topography) on population genetic divergence in tropical amphibians, based on a data set of 2680 DNA sequences of the mitochondrial cytochrome b gene in 39 widely distributed frog species from Brazil, Central America, Cuba, and Madagascar. Generalized linear models were implemented in an information-theoretic framework to evaluate the effects of the six predictors on genetic divergence among populations, measured as spatially corrected pairwise distances. Results indicate that topographic complexity and macrohabitat preferences have a strong effect on population divergence with species specialized to forest habitat and/or from topographically complex regions showing higher phylogeographic structure. This relationship changed after accounting for phylogenetic relatedness among Electronic supplementary material The online version of this article (taxa rendering macrohabitat preferences as the most important feature shaping genetic divergence. The remaining predictors showed negligible effects on the observed genetic divergence. A similar analysis performed using the population-scaled mutation rate (H) as response variable showed little effect of the predictors. Our results demonstrate greater evolutionary independence among populations of anurans from forested regions versus species from open habitats. This pattern may result from lower vagility and stringency in reproductive requirements of rainforest species. Conversely, open landscapes may offer ephemeral and unstable breeding sites suitable for vagile generalist species, resulting in reduced intraspecific divergence. Our results predict that, for a given period of time, there should be a higher chance of speciation in tropical anurans living in forests than in species adapted to open habitats.

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Section: Proximate Causes Of Population Divergencementioning

confidence: 99%

Genetic divergence in tropical anurans: deeper phylogeographic structure in forest specialists and in topographically complex regions

et al. 2015

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“…It would appear that without at least a few refuges, the habitat is not suitable for Blanchard's cricket frogs. Blanchard's cricket frogs appear to be declining for unknown reasons at the northern edge of their range (Youngquist and Boone 2014) but our results suggest their current status in the study area should not be of concern.…”

Section: Discussionmentioning

confidence: 60%

Short‐term anuran community dynamics in the Missouri River floodplain following an historic flood

2015

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Abstract. Extreme ecological disturbances such as floods, wildfires, and droughts are difficult to study because they are rare and unpredictable. We had the opportunity to study the effect of an historic flood on an anuran community in the Missouri River floodplain. We used occupancy estimation to estimate the proportion of wetlands occupied by calling adult male anurans. Three species-the plains leopard frog (Lithobates blairi ), Woodhouse's toad (Anaxyrus woodhousii ), and Blanchard's cricket frog (Acris blanchardi )-had only minor changes in occupancy rate two years after the flood. Colonization rates for these species were positively associated with wetlands that were shallower near the shore and they did not appear to be affected by reduced vegetation. Three other species or species complexes-the northern leopard frog (Lithobates pipiens), the gray treefrog complex (Hyla versicolor and Hyla chrysocelis), and the boreal chorus frog (Pseudacris maculata)-had greatly reduced occupancy rates two years after the flood. Colonization rates for these species were relatively low, while they had high extinction rates. Colonization rates for these species were not associated with any habitat characteristic we measured. Future flood events will likely continue to make northern leopard frogs, gray treefrogs, and boreal chorus frogs a less important part of the ecological community. While some species may fare well under extreme climate events, such as this flood, that are forecast under climate change scenarios, many species will struggle.

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“…Ranid species such as R. cascadae often rely on habitats in, or surrounding, lentic areas and may not commonly move large distances after metamorphosis (Semlitsch & Bodie, ). Other studies have found that land cover can also impact movement behavior (Cline & Hunter, ; Stevens, Polus, Wesselingh, Schtickzelle, & Baguette, ; Youngquist & Boone, ) which could be differentially responded to by species. The synchrony and timing of metamorphosis, which varies between species, could influence movement behavior for species that rely on conspecific density to trigger mass emergence from pond margins.…”

Section: Discussionmentioning

confidence: 99%

The integrative effects of behavior and morphology on amphibian movement

Bredeweg

Morzillo

Thurman

et al. 2019

Ecology and Evolution

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Animal movement and dispersal are key factors in population dynamics and support complex ecosystem processes like cross‐boundary subsidies. Juvenile dispersal is an important mechanism for many species and often involves navigation in unfamiliar habitats. For species that metamorphose, such as amphibians, this transition from aquatic to terrestrial environments involves the growth and use of new morphological traits (e.g., legs). These traits strongly impact the fundamental ability of an organism to move in novel landscapes, but innate behaviors can regulate choices that result in the realized movements expressed. By assessing the integrative role of morphology and behavior, we can improve our understanding of juvenile movement, particularly in understudied organisms like amphibians. We assessed the roles of morphological (snout‐vent length and relative leg length) and performance (maximal jump distance) traits in shaping the free movement paths, measured through fluorescent powder tracking, in three anuran species, Pacific treefrog (Hyliola regilla), Western toad (Anaxyrus boreas), and Cascades frog (Rana cascadae). We standardized the measurement of these traits to compare the relative role of species' innate differences versus physical traits in shaping movement. Innate differences, captured by species identity, were the most significant factor influencing movement paths via total movement distance and path sinuosity. Relative leg length was an important contributor but significantly interacted with species identity. Maximal jump performance, which was significantly predicted by morphological traits, was not an important factor in movement behavior relative to species identity. The importance of species identity and associated behavioral differences in realized movement provide evidence for inherent species differences being central to the dispersal and movement of these species. This behavior may stem from niche partitioning of these sympatric species, yet it also calls into question assumptions generalizing anuran movement behavior. These species‐level effects are important in framing differences as past research is applied in management planning.

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Movement of amphibians through agricultural landscapes: The role of habitat on edge permeability

Cited by 46 publications

References 46 publications

Genetic divergence in tropical anurans: deeper phylogeographic structure in forest specialists and in topographically complex regions

Genetic divergence in tropical anurans: deeper phylogeographic structure in forest specialists and in topographically complex regions

Short‐term anuran community dynamics in the Missouri River floodplain following an historic flood

The integrative effects of behavior and morphology on amphibian movement

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