Spatial Ecology and Resource Selection of Eastern Box Turtles

2020 ◽  
Vol 84 (8) ◽  
pp. 1590-1600
Author(s):  
Katie A. Harris ◽  
Joseph D. Clark ◽  
R. Dwayne Elmore ◽  
Craig A. Harper
Keyword(s):  
Resource Selection ◽  
Spatial Ecology ◽  
Box Turtles ◽  
Eastern Box Turtles ◽  
Selection Of

Post-Natal Movement, Habitat Use, and Hibernacula Selection of Eastern Box Turtles (Terrapene carolina carolina) in Southern New England

2020 ◽  
Vol 27 (2) ◽  
pp. 358
Author(s):  
Barbara J. Nicholson ◽  
Dennis P. Quinn ◽  
Marc A. Rivadeneyra
Keyword(s):  
Habitat Use ◽  
New England ◽  
Terrapene Carolina ◽  
Southern New England ◽  
Box Turtles ◽  
Eastern Box Turtles ◽  
Terrapene Carolina Carolina ◽  
Selection Of

scholarly journals Microhabitat selection of the poorly known lizard Tropidurus lagunablanca (Squamata: Tropiduridae) in the Pantanal, Brazil

2021 ◽  
Vol 61 ◽  
pp. e20216118
Author(s):  
Ronildo Alves Benício ◽  
Daniel Cunha Passos ◽  
Abraham Mencía ◽  
Zaida Ortega
Keyword(s):  
Resource Selection ◽  
Spatial Ecology ◽  
Conditional Logistic Regression ◽  
Natural Populations ◽  
Selection Function ◽  
Microhabitat Use ◽  
Microhabitat Selection ◽  
Probability Of Presence ◽  
Substrate Temperatures ◽  
Selection Of

Understanding how different environmental factors influence species occurrence is a key issue to address the study of natural populations. However, there is a lack of knowledge on how local traits influence the microhabitat use of tropical arboreal lizards. Here, we investigated the microhabitat selection of the poorly known lizard Tropidurus lagunablanca (Squamata: Tropiduridae) and evaluated how environmental microhabitat features influence animal’s presence. We used a Resource Selection Function approach, in a case/control design where we analyzed the effect of substrate temperature and tree’s diameter at breast height (DBH) in the probability of presence of lizards using mixed Conditional Logistic Regression. We found that T. lagunablanca uses trees with DBH from 0.40 m to 4 m and substrate temperatures ranging from 25.9℃ to 42℃. Moreover, we showed that thickness of the trees and substrate temperatures significantly increased the probability of presence of T. lagunablanca individuals, being the probability of presence higher than 50% for trees up to 1.5 m DBH and temperature of substrate up to 37.5℃. Our study probed that T. lagunablanca individuals choose trees non-randomly, selecting thicker and warmer tree trunks. This information advances the knowledge of the spatial ecology of Neotropical arboreal lizards and is relevant for conservation, putting an emphasis on preserving native vegetation in the Pantanal.

scholarly journals Spatiotemporal variation in resource selection of servals: insights from a landscape under heavy land-use transformation

2015 ◽  
Vol 97 (2) ◽  
pp. 554-567 ◽  
Author(s):  
Tharmalingam Ramesh ◽  
Riddhika Kalle ◽  
Colleen T. Downs
Keyword(s):  
South Africa ◽  
Home Range ◽  
Resource Selection ◽  
Spatial Ecology ◽  
Selection Index ◽  
Natural Habitats ◽  
Home Range Overlap ◽  
Habitat Gradient ◽  
Range Overlap ◽  
Selection Of

Abstract Changes in habitat composition and structure along natural agricultural habitat gradient affect spatial ecology of carnivores at both intraspecific and interspecific levels. An important prerequisite for the conservation and management of habitat specialists is a sound understanding of how they use indigenous habitats within fragmented landscapes. We present the 1st comprehensive study on home range, overlap, and resource selection of 16 radiocollared servals ( Leptailurus serval ) in the Drakensberg Midlands, South Africa. Servals (11 males and 5 females) were livetrapped and radiotracked between May 2013 and August 2014 covering 4 seasons (winter, spring, summer, and autumn). Mean annual home range estimates (95% and 50% fixed kernel [FK], respectively) for males (38.07 km 2 ; 8.27 km 2 ) were generally larger than for females (6.22 km 2 ; 1.04 km 2 ). Although male core ranges varied slightly in spring, overall serval home ranges were stable across seasons. There was considerable intersexual home range overlap (> 85%), whereas intrasexual overlap was rare (< 10%). Home range size decreased with increase in age and less availability of wetland, while it increased in males at both levels (95% FK and 50% FK). For both sexes, Manley’s selection index indicated that natural habitats including wetlands and forest with bushland ranked higher than all other habitat classes. However, forested habitat was used approximately 2 times more frequently by males than females whereas cropland was avoided by both sexes. Overall, wetlands were ranked highest, followed by forest with bushland, grassland, plantations, and cropland in terms of serval resources selection. Our results emphasize that natural habitats, mainly wetlands and forests with bushland, are important predictors of spatiotemporal habitat use of servals in the agricultural mosaics of South Africa.

Home range size, space use and resource selection of griffon vultures in an insular environment

2021 ◽  
Author(s):  
S. M. Xirouchakis ◽  
C. Grivas ◽  
G. Andreou ◽  
E. Georgopoulou
Keyword(s):  
Home Range ◽  
Resource Selection ◽  
Space Use ◽  
Home Range Size ◽  
Range Size ◽  
Selection Of

Behavioural and physiological responses to simulated predator-induced stress in the eastern box turtle, Terrapene carolina carolina

2020 ◽  
Vol 41 (3) ◽  
pp. 387-398
Author(s):  
Victoria L. Preston ◽  
Jessica M. Vannatta ◽  
Matthew Klukowski
Keyword(s):  
Physiological Responses ◽  
Plasma Corticosterone ◽  
Seasonal Effects ◽  
Graded Response ◽  
Box Turtles ◽  
Eastern Box Turtles ◽  
Lactate Levels ◽  
Terrapene Carolina Carolina ◽  
Almost All ◽  
Free Ranging

Abstract In spite of the fully-hinged shell being the defining characteristic of box turtles, few studies have quantified the behavioural use of the shell in response to predator encounters. While it is often assumed that box turtles simply withdraw into their shell in response to threats, we expected variability among individuals in shell usage and in the degree of head and limb retraction because withdrawal is likely to be costly. We tested the behavioural and physiological responses of free-ranging eastern box turtles to stimuli of varying intensity: observation only, a visual stimulus, a poke on the leg, or a pinch on the leg before being flipped. The more intense the simulated predatory stimulus, the more likely turtles were to fully close their shell. However, stimulus intensity did not affect plasma corticosterone or lactate levels. This may be due to too brief or weak of a stimulus, increased parasympathetic activity, or seasonal effects. Upon capture and during handling, almost all turtles withdrew into their shells and closed their anterior plastron, although fewer closed their posterior plastron, and a few engaged in other behaviours such as biting and urinating. Older, larger turtles were able to close their shells with greater strength than younger and smaller turtles. Our results indicate that in spite of their fully closable shell, box turtles exhibit a graded response to perceived threats. This suggests that full closure of the shell is likely to be costly and occurs only in response to the most intense stimuli.

Resource selection by grazing herbivores on post-fire regrowth in a West African woodland savanna

2007 ◽  
Vol 34 (2) ◽  
pp. 77 ◽  
Author(s):  
Erik Klop ◽  
Janneke van Goethem ◽  
Hans H. de Iongh
Keyword(s):  
Resource Selection ◽  
West African ◽  
Tree Cover ◽  
Resource Selection Functions ◽  
Risk Of Predation ◽  
Savanna Fires ◽  
Grass Sward ◽  
Burnt Areas ◽  
Good Visibility ◽  
Selection Of

The preference of grazing herbivores to feed on grass regrowth following savanna fires rather than on unburnt grass swards is widely recognised. However, there is little information on which factors govern patterns of resource selection within burnt areas. In this study, we attempted to disentangle the effects of different habitat and grass sward characteristics on the utilisation of post-fire regrowth by nine species of ungulates in a fire-dominated woodland savanna in north Cameroon. We used resource-selection functions based on logistic regression. Overall, the resource-selection functions identified the time elapsed since burning as the most influential parameter in determining probability of use by ungulates, as most species strongly selected swards that were recently burned. This pattern might be related to nutrient levels in the grass sward. In addition, most species selected areas with high grass cover and avoided grass swards with high amounts of dead stem material. This is likely to increase bite mass and, hence, intake rates. The avoidance of high tree cover by some species may suggest selection for open areas with good visibility and, hence, reduced risk of predation. Body mass seemed to have no effect on differential selection of post-fire regrowth, irrespective of feeding style.

Identification of a novel herpesvirus in captive Eastern box turtles (Terrapene carolina carolina)

2015 ◽  
Vol 175 (2-4) ◽  
pp. 218-223 ◽  
Author(s):  
Richard R. Sim ◽  
Terry M. Norton ◽  
Ellen Bronson ◽  
Matthew C. Allender ◽  
Nancy Stedman ◽  
...  
Keyword(s):  
Terrapene Carolina ◽  
Box Turtles ◽  
Eastern Box Turtles ◽  
Terrapene Carolina Carolina

scholarly journals Value analysis as a mechanism to reduce the complexity of the selection of the resources system for Agile/Virtual Enterprises in the context of Industry 4.0

2021 ◽  
Vol 49 (4) ◽  
pp. 806-816
Author(s):  
Paulo Ávila ◽  
António Pires ◽  
Goran Putnik ◽  
João Bastos ◽  
Maria Cruz-Cunha
Keyword(s):  
Industry 4.0 ◽  
Resource Selection ◽  
Selection Process ◽  
Virtual Enterprises ◽  
Value Analysis ◽  
Problem Formulations ◽  
Integration Project ◽  
Process Complexity ◽  
Final System ◽  
Selection Of

The selection of the resources system (SRS) is an important element in the integration/project of Agile/Virtual Enterprises (A/V E) because its performance is dependent of this selection, and even of its creation. However, it remains a difficult matter to solve because is still a very complex and uncertain problem. We propose that using Value Analysis (VA) in the pre-selection of resources phase represents a significant improvement of the SRS process. The current literature fails to formally address the pre-selection phase and none of the resource selection models incorporate the resources value and its consequence in the complexity of the selection process. Whereby, ours developed model with VA constitutes an innovative approach towards greater sustainability in the configuration of A/V E in the context of Industry 4.0, where a massive interconnection among enterprises is expected and consequently the increase of the selection process complexity. After the construction of a demonstrator tool for a set of the problem formulations, this paper verifies by computational results the thesis regarding the benefits of applying VA to the SRS process: VA reduces the complexity of the SRS process, even ensuring that the final system of resources achieve higher quality/value grade.

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