Population Size and Habitat use of Spider Monkeys at Punta Laguna, Mexico

2003 ◽  
pp. 191-209 ◽  
Author(s):  
Gabriel Ramos-Fernández ◽  
Bárbara Ayala-Orozco
Keyword(s):  
Habitat Use ◽  
Population Size ◽  
Spider Monkeys

scholarly journals Long-term inference of population size and habitat use in a socially dynamic population of wild western lowland gorillas

2019 ◽  
Vol 20 (6) ◽  
pp. 1303-1314 ◽  
Author(s):  
Laura Hagemann ◽  
Mimi Arandjelovic ◽  
Martha M. Robbins ◽  
Tobias Deschner ◽  
Matthew Lewis ◽  
...  
Keyword(s):  
Habitat Use ◽  
Population Size ◽  
Western Lowland Gorillas ◽  
Dynamic Population ◽  
Lowland Gorillas

scholarly journals Hierarchical distance sampling reveals increased population size and broader habitat use in the endangered Bahama Oriole

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Michael G. Rowley ◽  
Richard C. Stanley ◽  
Janine M. Antalffy ◽  
Jennifer L. Christhilf ◽  
Daniel C. Stonko ◽  
...  
Keyword(s):  
Habitat Use ◽  
Population Size ◽  
Distance Sampling

Seasonal patterns in habitat use by the harvest mouse (Micromys minutus) and other small mammals

Mammalia ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Francesca Occhiuto ◽  
Eman Mohallal ◽  
Geoffrey D. Gilfillan ◽  
Andrew Lowe ◽  
Tom Reader
Keyword(s):  
Habitat Use ◽  
Population Size ◽  
Arable Land ◽  
Sampling Effort ◽  
Seasonal Fluctuations ◽  
Mammal Species ◽  
Wood Mice ◽  
Bank Voles ◽  
Harvest Mouse ◽  
Micromys Minutus

Abstract The ecology of the harvest mouse (Micromys minutus) is poorly understood, partly because it is a difficult species to monitor. It is commonly associated with reedbeds, where evidence suggests that it experiences strong seasonal fluctuations in abundance. However, it is unknown whether these fluctuations are caused by real changes in population size, or by movement between habitats. This study investigated seasonal changes in population size and habitat use by harvest mice, and other small mammal species, by trapping the reedbed and three associated habitat types: woodland, pasture and arable land. A sampling effort of 9887 trap bouts across nine months, resulted in 70 captures of harvest mice, as well as wood mice (N = 1022), bank voles (N = 252), field voles (N = 9), common shrews (N = 86) and pygmy shrews (N = 7). The reedbed was the habitat with the most captures and highest diversity. Harvest mice were caught exclusively in the reedbed at the beginning of autumn. Wood mice and bank voles experienced fluctuations in population numbers and wood mice also showed seasonal variation in habitat use. Our study supports the idea that harvest mice undergo extreme seasonal fluctuations in abundance in reedbeds, but these do not appear to be related to changes in habitat use.

Use of Rock-wallaby Faecal Pellets for Detecting and Monitoring Populations and Examining Habitat Use.

1996 ◽  
Vol 19 (2) ◽  
pp. 257
Author(s):  
P.J. Jarman ◽  
S.M. Capararo
Keyword(s):  
Habitat Use ◽  
Population Size ◽  
Colony Size ◽  
Survey Design ◽  
Habitat Preferences ◽  
Faecal Pellets ◽  
Herbivorous Mammals ◽  
Measured Distribution ◽  
Absolute Population ◽  
Over Time

Counts of faecal pellets are commonly used to measure dispersion of medium to large, herbivorous mammals, including macropods. Rock-wallabies, Genus Petrogale, are relatively difficult to observe in the daytime, so indirect techniques for survey and measurement of dispersion and population size are attractive. Faecal pellets of rock-wallabies are easy to identify and to detect, often being rapidly dried and well preserved on rock substrates. Pellets have been used in surveys to detect past and recent presence of rock-wallabies in refuge habitat. Their measured distribution can also indicate limits to foraging range away from refuge habitat, information that is important for their management. By making careful correction for the expected form of distribution of rock-wallaby foraging away from refuge habitat, pellet sampling can be used to measure their habitat preferences. Pellet sampling can be used, with careful survey design, to monitor change in colony size over time; but it could be used only with difficulty to indicate absolute population size accurately. In some circumstances it will be more efficient to attempt to observe and count the wallabies directly.

The rusty-margined guan (Penelope superciliaris) in the Brazilian Atlantic rain forest: density, population size, activity and habitat use

2018 ◽  
Vol 45 (6) ◽  
pp. 551
Author(s):  
Juliane Pereira-Ribeiro ◽  
Átilla Colombo Ferreguetti ◽  
Walfrido Moraes Tomas ◽  
Helena Godoy Bergallo ◽  
Carlos Frederico Duarte Rocha ◽  
...  
Keyword(s):  
Habitat Use ◽  
Population Size ◽  
Camera Traps ◽  
Habitat Modification ◽  
Line Transect ◽  
Parameter Estimates ◽  
Atlantic Rain Forest ◽  
Occupancy Modelling ◽  
The Impact ◽  
Density Population

Context Population estimation and monitoring are important tools for the support of programs and actions of conservation for most wildlife species, including birds. For validation of such support, a set of reliable, consistent and comparable parameter estimates is essential (through systematic monitoring over time), in addition to studies on ecological aspects of the species. Aims In this study, our aim was to analyse the population of Penelope superciliaris in the Vale Natural Reserve (VNR), located in north-eastern Espírito Santo, Brazil, providing estimates of density, population size and activity. We also analysed occupancy and detectability of the species, relating them to six covariates (distance from forest edge, water and road, as well as poaching intensity, canopy cover and understorey cover) based on previous knowledge of the ecology of rusty-margined guan. Methods We used line-transect surveys to estimate density and abundance, and camera traps to estimate habitat use by P. superciliaris, using the occupancy modelling approach. Key results Estimated density for P. superciliaris was 2.5 ± 1.0 groups per km2 with a group size of 6.0 ± 2.0 individuals, and estimated population size for the entire VNR was 3544 ± 495 individuals. Occupancy by P. superciliaris was best described by three covariates: (1) distance to road; (2) distance to water; and (3) poaching intensity. Detectability was affected by two covariates: (1) understorey cover; and (2) poaching intensity. Conclusions Our results provide the first information on density, habitat use and activity of P. superciliaris in the VNR. We concluded that P. superciliaris is active diurnally, especially during morning and late afternoon, prefers areas near water sources in denser forests and tends to avoid areas with habitat modification and intense poaching activity. Implications Our data highlight the impact of poaching on the species and can be useful as a baseline for future studies and Cracid conservation plans.

scholarly journals Distribution and habitat use of the Madagascar Peregrine Falcon: first estimates for area of habitat and population size

2021 ◽  
Author(s):  
Luke J. Sutton ◽  
Lily-Arison Réné de Roland ◽  
Russell Thorstrom ◽  
Christopher J.W. McClure
Keyword(s):  
Habitat Use ◽  
Population Size ◽  
Habitat Preferences ◽  
High Elevation ◽  
Range Limits ◽  
Tropical Species ◽  
Peregrine Falcon ◽  
Distribution Models ◽  
The Core ◽  
Vegetation Heterogeneity

AbstractAccurately demarcating species distributions has long been at the core of ecology. Yet our understanding of the factors limiting species range limits is incomplete, especially for tropical species in the Global South. Human-driven threats to the survival of many taxa are increasing, particularly habitat loss and climate change. Identifying distributional range limits of at-risk and data-limited species using Species Distribution Models (SDMs) can thus inform spatial conservation planning to mitigate these threats. The Madagascar Peregrine Falcon (Falco peregrinus radama) is the resident sub-species of the Peregrine Falcon complex distributed across Madagascar, Mayotte, and the Comoros Islands. Currently, there are significant knowledge gaps regarding its distribution, habitat preferences and population size. Here, we use point process regression models and ordination to identify Madagascar Peregrine Falcon environmental range limits and propose a population size estimate based on inferred habitat. From our models, the core range of the Madagascar Peregrine Falcon extends across the central upland plateau of Madagascar with a patchier range across coastal and low-elevation areas. Range-wide habitat use indicated that the Madagascar Peregrine Falcon prefers areas of high elevation and aridity, coupled with high vegetation heterogeneity and > 95 % herbaceous landcover, but generally avoids areas of > 30 % cultivated land and > 10 % mosaic forest. Based on inferred high-class habitat, we estimate this habitat area could potentially support a population size ranging between 150-300 pairs. Following International Union for Conservation of Nature Red List guidelines, we recommend this sub-species be classed as Vulnerable, due to its small population size. Despite its potentially large range, the Madagascar Peregrine has specialized habitat requirements and would benefit from targeted conservation measures based on spatial models in order to maintain viable populations.

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