Which population density affects home ranges of co-occurring rodents?

Casula, Paolo; Luiselli, Luca; Amori, Giovanni

doi:10.1016/j.baae.2018.11.002

Cited by 20 publications

(26 citation statements)

References 34 publications

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“…This study was based on the results of one experimental field in which it would also be desirable to apply the same methodology in other habitats with the aim to check whether the results are consistent in space and time. Finally, its study is one of few (see Casula et al, 2018) that made use of parameters other than density or population composition that can be derived for SCR modelling (here sexspecific σ and g0 parameter values that informed about differences in the movements and detection probabilities of males and females). I encourage more use of such information to improve our understanding of the ecology and population dynamics of animals studied with CMR and SCR modelling.…”

Section: Discussionmentioning

confidence: 99%

“…To date, only one paper on small rodents has made use of this information and evaluated whether home range size (as estimated by the sigma parameter) varied with population density. In their study, Casula et al (2018) found that home ranges of co-occurring Apodemus flavicolis and Myodes glareolus where both negatively related to intraspecific density, meaning that the respective species tended to reduce both home range and dispersal with higher values of abundance resources which is related with high density populations.…”

Section: Making More Use Of Scr Model Outputsmentioning

confidence: 95%

“…the aforementioned baseline probability of detection, [g0], or the movement parameter, [σ]). To the best of our knowledge, only one paper by Casula et al, (2018) used the movement parameter (σ) to study whether the home ranges of different rodent species decreased or increased in relation to the density of the other rodents.…”

Section: A Case Study On Common Voles (Microtus Arvalis)mentioning

confidence: 99%

“…One of the main objectives of many studies that make use the SCR methodology is to obtain a robust and precise estimate of density (Efford et al, 2009;Sollmann et al, 2011;Royle et al, 2011 in order to inform conservation, management or protection plans (Kéry et al, 2011;Gray & Prum, 2011). However, parameters which explore additional behavioral effects are rarely used (but see Casula et al, 2018). SCR modelling provides relevant information on how the probability of detection varies according to sex, time or behavior (chapter 1), and how these decrease as a function of the distance between an individual´s activity center and a detector (e.g., devices such as traps, cameras, hair snares: or observers in transects), and informs on whether these parameters differ between sexes or not.…”

Section: Making More Use Of Scr Model Outputsmentioning

confidence: 99%

“…Estimating these latter parameters can inform on possible variations in movements or basal detection rate or in time (e.g. seasonal variations, densitydependence; Casula et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Spatial capture-recapture models for the ecological study of common voles (Microtus arvalis) in NW Spain

López-Villar¹,

Agustín²

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Resumen 4 1. Introduction 7 3.3 Chapter 3. Vole sex-ratio assessment An assessment of capture biases that influence estimates of population sex-ratio in a fossorial rodent 108 4. Discussion 4.1 Brief summary of the main message of this thesis 4.2 The importance of detection probability for population monitoring 4.3 Capture-recapture studies and how they deal with detectability 4.4 Spatial capture-recapture studies 4.4.1 Making more use of SCR model outputs 4.4.2 Limitations of SCR models to our model species 4.5 Future research lines

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Section: Discussionmentioning

confidence: 99%

Section: Making More Use Of Scr Model Outputsmentioning

confidence: 95%

Section: A Case Study On Common Voles (Microtus Arvalis)mentioning

confidence: 99%

Section: Making More Use Of Scr Model Outputsmentioning

confidence: 99%

“…Estimating these latter parameters can inform on possible variations in movements or basal detection rate or in time (e.g. seasonal variations, densitydependence; Casula et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Spatial capture-recapture models for the ecological study of common voles (Microtus arvalis) in NW Spain

López-Villar¹,

Agustín²

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Co‐occurrence of native white‐tailed deer and invasive wild pigs: Evidence for competition?

et al. 2023

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Understanding whether invasive and native species compete for shared resources where they co-occur is essential for mitigating the negative impacts of invasive species on native ecosystems. Here, we examined how the presence and density of an invasive species, wild pigs (Sus scrofa), affect native white-tailed deer (Odocoileus virginianus; hereafter, deer) on the Savannah River Site, SC, USA. We examined potential changes in deer areas of use, temporal overlap, and occupancy to evaluate the effects of wild pig occurrence and density on deer space use, diel activity, and co-occurrence with wild pigs across 9 months during 2018 and 2019. Wild pig density had the strongest effect on deer space use in high-and moderate-use areas. Declines in deer space use in response to wild pig density were most pronounced in March and October 2018 and April 2019 for females, while male space use declined in response to wild pig density in October and December 2018. Both species were largely nocturnal with high overlap in diel activity across months. Deer occupancy responses to wild pig density varied across months, with negative responses in May and October 2018 and positive responses in July 2018 and April 2019. Deer and wild pigs co-occurred at 30%-59% of camera stations across months, with broadscale co-occurrence patterns being unaffected by changes in shared cover or wild pig occurrence. Overall, our results suggest that deer make fine-scale behavioral adjustments to avoid wild pigs, providing evidence that competition is likely occurring even where wild pig density is relatively low. Such fine-scale behavioral plasticity in deer appears to mitigate the costs of competition with wild pigs and may be a mechanism enabling long-term co-existence of deer and wild pigs. Our study provides novel insight on the complexities of spatiotemporal relationships between invasive wild pigs and native deer and suggests that the negative effects of interactions between deer and wild pigs may be more pronounced when deer life history needs are particularly demanding. In areas where eradication of invasive wild pigs may be impossible, maintaining low wild pig densities may help mitigate, but may not eliminate, the negative effects of wild pigs on deer.

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Expanding and invading plant species in sagebrush steppe affect multiple aspects of small‐mammal ecology

Young,

Johnson

2024

J Wildl Manag

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Invasion and expansion of non‐native and native plants have altered vegetation structure in many terrestrial ecosystems. Small mammals influence multiple ecosystem processes through their roles as ecosystem engineers, predators, and prey, and changes to vegetation structure can affect habitat use, community composition, and predator‐prey interactions for this assemblage of wildlife. In the sagebrush (Artemisia spp.) shrublands of the western United States, invasion by non‐native grasses and expansion of native conifer trees beyond their historical range has altered vegetation structure. These changes may potentially affect distributions and interactions of deer mice (Peromyscus maniculatus), which are generalist omnivores, and Columbia Plateau pocket mice (Perognathus parvus), more specialized granivores. To assess the extent to which altered habitat affects small‐mammal density, survival, and home‐range size, we examined these aspects of small‐mammal ecology along a gradient of cheatgrass (Bromus tectorum) invasion and western juniper (Juniperus occidentalis) establishment in sagebrush shrublands in southwestern Idaho, USA. From 2017–2019, we used a spatially explicit mark‐recapture design to examine attributes of small‐mammal ecology along an invasion gradient. We did not find support for an effect of cheatgrass cover on density or survival of either species. Home‐range size of deer mice was 2.3 times smaller in heavier cheatgrass cover (60%) compared to areas with little or no cheatgrass cover. Density of deer mice was highest (5 individuals/ha) in areas with 10% juniper cover and decreased with increasing juniper cover, whereas density of pocket mice was positively influenced by shrub cover. Survival of deer mice declined as juniper stem density increased. Conversely, survival of pocket mice increased with increasing juniper stem density. We found evidence for interspecific interactions between these 2 species, in the form of a density‐dependent effect of deer mice on pocket mouse home‐range size. Home‐range size for pocket mice was 2 times smaller in areas with the highest estimated density of deer mice compared to areas with low densities of deer mice. Our data provides unique information about how small mammals in the sagebrush steppe are affected by expanding and invasive plant species and potential ways that habitat restoration efforts, in the form of conifer removal, may influence small mammals. Understanding the response of small mammals to conifer expansion or removal may shed light on the demographic and numerical responses of other wildlife associated with the sagebrush biome, including predators.

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Which population density affects home ranges of co-occurring rodents?

Cited by 20 publications

References 34 publications

Spatial capture-recapture models for the ecological study of common voles (Microtus arvalis) in NW Spain

Spatial capture-recapture models for the ecological study of common voles (Microtus arvalis) in NW Spain

Co‐occurrence of native white‐tailed deer and invasive wild pigs: Evidence for competition?

Expanding and invading plant species in sagebrush steppe affect multiple aspects of small‐mammal ecology

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