Does predation risk influence habitat use by northern redbelly dacePhoxinus eosat different spatial scales?

2009 ◽  
Vol 74 (7) ◽  
pp. 1371-1382 ◽  
Author(s):  
A. Dupuch ◽  
P. Magnan ◽  
A. Bertolo ◽  
L. M. Dill ◽  
M. Proulx
Keyword(s):  
Habitat Use ◽  
Predation Risk ◽  
Spatial Scales

Do changes in reef habitats influence relative predation risk on the juvenile Australasian spiny lobster, Jasus edwardsii (Hutton, 1875)?

Crustaceana ◽  
2015 ◽  
Vol 88 (7-8) ◽  
pp. 839-856 ◽  
Author(s):  
J. Hesse ◽  
J. A. Stanley ◽  
A. G. Jeffs
Keyword(s):  
Predation Risk ◽  
Spatial Scales ◽  
Spiny Lobster ◽  
Habitat Type ◽  
Small Spatial Scale ◽  
Important Species ◽  
Early Juvenile ◽  
Risk Of Predation ◽  
Jasus Edwardsii ◽  
Commercially Important

Kelp habitats are in decline in many temperate coastal regions of the world due to climate change and expansion of populations of grazing urchins. The loss of kelp habitat may influence the vulnerability to predators of the juveniles of commercially important species. In this study relative predation rates for kelp versus barren reef habitat were measured for early juvenile Australasian spiny lobster, Jasus edwardsii (Hutton, 1875), on the northeastern coast of New Zealand using tethering methods. Variation in assemblages of predators over small spatial scales appeared to be more important for determining the relative predation of lobsters, regardless of habitat type. Therefore, the assessment of relative predation risk to early juvenile lobsters between kelp and barren habitats will require more extensive sampling at a small spatial scale, as well as a specific focus on sampling during crepuscular and nocturnal periods when these lobsters are most at risk of predation.

Predation risk and competition affect habitat use of adult perch, Perca fluviatilis

2020 ◽  
Vol 96 (3) ◽  
pp. 669-680
Author(s):  
Christina Henseler ◽  
Marie C. Nordström ◽  
Anna Törnroos ◽  
Martin Snickars ◽  
Erik Bonsdorff
Keyword(s):  
Habitat Use ◽  
Predation Risk ◽  
Perca Fluviatilis ◽  
Perch Perca Fluviatilis

Behaviour, habitat associations, and intrasexual differences of female Stone’s sheep

2006 ◽  
Vol 84 (8) ◽  
pp. 1187-1201 ◽  
Author(s):  
Andrew B.D. Walker ◽  
Katherine L. Parker ◽  
Michael P. Gillingham
Keyword(s):  
Habitat Use ◽  
Predation Risk ◽  
Growing Season ◽  
Early Summer ◽  
Habitat Associations ◽  
Phenological Stage ◽  
Shrub Species ◽  
Lichen Cover ◽  
Ovis Dalli ◽  
Maternal Status

Stone’s sheep ( Ovis dalli stonei Allen, 1897) in northern British Columbia segregate sexually during most of the year, and intrasexually between maternal and nonmaternal females during spring and early summer. Our objective was to quantify intrasexual habitat use of female Stone’s sheep relative to maternal status using measures of behaviour and habitat use. We reviewed three hypotheses of intersexual segregation (predation-risk, forage-selection, and activity-budget hypotheses) to determine if they also explained intrasexual segregation of female Stone’s sheep. Female Stone’s sheep spent the majority of their active time foraging. Nursery groups spent shorter durations of time active, more time active in solid rock escape features, and less time active in shrub habitat than nonmaternal groups. The best predictive model describing intrasexual differences incorporated distance to nearest escape feature and size of nearest escape feature. Regardless of maternal status, female Stone’s sheep used low-elevation plant communities early in the growing season that were characterized by more shrub species and increased cover. As the growing season progressed, they tracked a phenological stage, moving up in elevation and associating with communities that contained increasing amounts of moss and lichen cover. The patterns in behaviour, habitat use, and vegetation associations between intrasexual groups of Stone’s sheep were best characterized by the predation-risk hypothesis.

scholarly journals USE OF TRACK PLATES TO QUANTIFY PREDATION RISK AT SMALL SPATIAL SCALES

2005 ◽  
Vol 86 (5) ◽  
pp. 991-996 ◽  
Author(s):  
Matthew J. Connors ◽  
Eric M. Schauber ◽  
Andrew Forbes ◽  
Clive G. Jones ◽  
Brett J. Goodwin ◽  
...  
Keyword(s):  
Predation Risk ◽  
Spatial Scales ◽  
Track Plates

Do Habitat Use and Interspecific Association Reflect Predation Risk for the Golden-Headed Lion Tamarin (Leontopithecus chrysomelas)?

2015 ◽  
Vol 36 (6) ◽  
pp. 1198-1215 ◽  
Author(s):  
Juliana Monteiro de Almeida Rocha ◽  
Kristel Myriam De Vleeschouwer ◽  
Paula Pedreira Reis ◽  
Carlos Eduardo de V. Grelle ◽  
Leonardo C. Oliveira
Keyword(s):  
Habitat Use ◽  
Predation Risk ◽  
Interspecific Association ◽  
Leontopithecus Chrysomelas ◽  
Lion Tamarin

Feeding Habitats of Nesting Wading Birds: Spatial Use and Social Influences

The Auk ◽  
1983 ◽  
Vol 100 (4) ◽  
pp. 960-970 ◽  
Author(s):  
R. Michael Erwin
Keyword(s):  
Habitat Use ◽  
Spatial Scales ◽  
Close Association ◽  
Habitat Patch ◽  
Wading Birds ◽  
Feeding Habitat ◽  
Snowy Egret ◽  
Colony Site ◽  
The One ◽  
Over Time

Abstract In an effort to relate social interactions to feeding-habitat use, I observed six species of wading birds near a major colony site in coastal North Carolina. Three spatial scales of habitat use were considered: the general orientation to and from the colony (coarsest level), the habitat "patch," and (at the finest level) the microhabitat. Departure-arrival directions of Great Egrets (Casmerodius albus), Snowy Egrets (Egretta thula), Cattle Egrets (Bubulcus ibis), Little Blue Herons (Egretta caerulea), Tricolored Herons (Egretta tricolor), and Glossy Ibises (Plegadis falcinellus) were monitored at the colony site to document coarse patterns of feeding-habitat use. Added to these data were observations made at five different wetland sites to monitor between-habitat and within-habitat patterns for the five aquatic-feeding species. The results indicated a broad and variable use of feeding habitat over time. At the coarsest scale (i.e. orientation at the colony), diffuse patterns, influenced little by either inter- or intraspecific social interaction, were found for all species. At the next level (habitat "patch"), only one of five wetland sites was relatively consistent in attracting feeding birds, and its use increased from May to June. Few groups were seen at four of the five sites. At the one "attractive" site, the within-habitat patterns again were spatially variable over time, except for those of the abundant Snowy Egret, whose microhabitat preference was fairly consistent. Glossy Ibises and Snowy Egrets frequently formed mixed-species groups, Little Blue Herons were the least social, and Great Egrets and Tricolored Herons generally occurred in groups of less than 10 birds but rarely in groups larger than 30. The close association between Snowy Egrets and Glossy Ibises appeared to be based on a "beater-follower" relationship, wherein the probing, nonvisually feeding ibises make prey more available to the followers. In the study area, local enhancement appeared to play a more important role than did any "information-sharing" at the colony.

scholarly journals Identification of Factors Affecting Predation Risk for Juvenile Turtles Using 3D Printed Models

Animals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 275
Author(s):  
Sasha J. Tetzlaff ◽  
Alondra Estrada ◽  
Brett A. DeGregorio ◽  
Jinelle H. Sperry
Keyword(s):  
Predation Risk ◽  
Spatial Scales ◽  
Three Dimensional ◽  
Field Trials ◽  
Factors Affecting ◽  
Habitat Features ◽  
Terrapene Carolina ◽  
Vegetation Height ◽  
Management Actions ◽  
Box Turtles

Although it is widely accepted that juvenile turtles experience high levels of predation, such events are rarely observed, providing limited evidence regarding predator identities and how juvenile habitat selection and availability of sensory cues to predators affects predation risk. We placed three-dimensional printed models resembling juvenile box turtles (Terrapene carolina) across habitats commonly utilized by the species at three sites within their geographical range and monitored models with motion-triggered cameras. To explore how the presence or absence of visual and olfactory cues affected predator interactions with models, we employed a factorial design where models were either exposed or concealed and either did or did not have juvenile box turtle scent applied on them. Predators interacted with 18% of models during field trials. Nearly all interactions were by mesopredators (57%) and rodents (37%). Mesopredators were more likely to attack models than rodents; most (76%) attacks occurred by raccoons (Procyon lotor). Interactions by mesopredators were more likely to occur in wetlands than edges, and greater in edges than grasslands. Mesopredators were less likely to interact with models as surrounding vegetation height increased. Rodents were more likely to interact with models that were closer to woody structure and interacted with exposed models more than concealed ones, but model exposure had no effect on interactions by mesopredators. Scent treatment appeared to have no influence on interactions by either predator group. Our results suggest raccoons can pose high predation risk for juvenile turtles (although rodents could also be important predators) and habitat features at multiple spatial scales affect predator-specific predation risk. Factors affecting predation risk for juveniles are important to consider in management actions such as habitat alteration, translocation, or predator control.

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