Selection of Drey Sites by Abert's Squirrels in an Introduced Population

Edelman, Andrew J.; Koprowski, John L.

doi:10.1644/04-mamm-a-029r1.1

Cited by 24 publications

(29 citation statements)

References 33 publications

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“…Similar results have been observed in S. aureogaster in Florida (Brown and McGuire 1975), and in other species of tree squirrels (Best 1995;Brown 1984;Edwards and Guynn 1995;Robb et al 1996;Setoguchi 1991). It is likely that S. aureogaster in our study area is selective about structural characteristics of the habitat instead of specific tree species, similar to other species of tree squirrels (Edelman and Koprowski 2005;Edwards and Guynn 1995;Snyder and Linhart 1994). S. aureogaster selected larger and taller nest trees, with the 1st major branches higher, and the canopy open to build nests.…”

Section: Discussionsupporting

confidence: 86%

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Nest-Site Selection by the Mexican Red-Bellied Squirrel (Sciurus aureogaster) in MichoacáN, Mexico

Ramos-Lara¹,

Cervantes²

2007

J Mammal

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Section: Discussionsupporting

confidence: 86%

“…Unfortunately, although the nesting requirements of some species of tree squirrels are well known, especially in temperate regions (Edelman and Koprowski 2005;Edwards and Guynn 1995;Menzel et al 2004;Rothwell 1979;Setoguchi 1991;Wauters and Dhondt 1990), those in tropical regions are poorly understood.…”

mentioning

confidence: 99%

Nest-Site Selection by the Mexican Red-Bellied Squirrel (Sciurus aureogaster) in MichoacáN, Mexico

Ramos-Lara¹,

Cervantes²

2007

J Mammal

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“…Connectivity of the nestbox tree with the surroundings was the best in nest sites used by M. avellanarius for breeding and preferred for resting. Nest site connectivity for arboreal travel was also a significant predictor of nest site selection by the western grey squirrel Sciurus griseus (Gregory et al 2010) and Abert's squirrel Sciurus aberti (Edelman and Koprowski 2005).…”

Section: Discussionmentioning

confidence: 97%

Nest site selection by the hazel dormouse Muscardinus avellanarius: is safety more important than food?

2013

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Background: Vegetation parameters determining nest site selection by the hazel dormouse Muscardinus avellanarius were studied in a typical habitat where dormice are relatively common in Lithuania, the northern periphery of its distributional range. Results: Dormice preferred nest sites with a better-developed understory, particularly with a good cover of hazel shrubs taller than 4 m and plentiful bird cherry trees, a high diversity of woody plant species in the understory and overstory, and better connectivity of the nest tree with its surroundings. They avoided sites with a high number of mature Norway spruce trees in the canopy and a high density of young trees. In a stepwise multiple regression analysis, three vegetation parameters of the number of shrub species, the cover of hazel shrubs, and the number of Norway spruce trees in the canopy determined over 85% of the index of nestbox use by M. avellanarius. The number of shrub species in the surroundings of the nest site had the highest impact of all. Nest sites used by dormice for breeding were distinguished by a better-developed understory, particularly by a significantly higher number of bird cherry trees and a lower number of Norway spruce trees in the canopy, as well as a higher diversity of plants in the understory and overstory. Conclusions: Selection of nest sites by M. avellanarius is a combination of safety from predators and the presence of food. A well-developed inter-connected understory ensures the safety of nest sites from predators, and the diversity of understory and overstory species guarantees continuity of the food supply in the vicinity of nest sites.

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“…For foraging site characteristics, we used a 10-m radius plot (area, 0.03 ha) centered on the feeding site tree. We determined the total number, species, condition (live, dead), and diameter at breast height (DBH) for all woody stems ≥ 3 cm, and used a spherical densitometer to estimate canopy cover (Strickler 1959, Smith and Mannan 1994, Edelman and Koprowski 2005b. We calculated the Shannon-Wiener diversity index; total basal area (m 2 /ha); number of live and dead trees/ha; number of logs/ha; and number of trees > 20 cm, > 30 cm, and 40 cm of DBH/ha within each circular plot.…”

Section: Foraging Sitesmentioning

confidence: 99%

“…Interestingly, Amazon red squirrels did not select for characteristics of the forest at the site level. Lack of site selectivity at ARC differs from other tree squirrels that are usually associated with specific characteristics, such as canopy cover, tree density, number of logs, number of large trees, number of live and dead trees/ha, and basal area (Pereira and Itami 1991, Edelman and Koprowski 2005b, Cudworth and Koprowski 2011, Jessen 2013. Characteristics of focal trees were similar to characteristics important to other tree squirrels (Edelman and Koprowski 2005b, Cudworth and Koprowski 2011, Jessen 2013.…”

Section: Foraging Sitesmentioning

confidence: 99%

Feeding behavior and activity patterns of Amazon red squirrels

Palmer

Koprowski

2014

Mammalia

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Foraging sites are important for the survival of animals. Individuals cue on characteristics of the forest that offer enough food resources and also provide safety. During June and July of 2009 and 2010, we studied northern and southern Amazon red squirrels (Sciurus igniventris, S. spadiceus) to determine what forest characteristics were associated with feeding sites. We examined habitat use at three levels: vegetation community where feeding sign was located, site characteristics of the forest immediately surrounding the feeding sign, and the tree exhibiting feeding sign. We measured the site characteristics inside a 10-m radius circular plot, the physical characteristics of the tree exhibiting feeding sign, and the same variables at random locations for comparison. Because there is lack of knowledge about these squirrels, we also conducted focal observations to study their behavior. Squirrels use mainly high and low restinga and selected Astrocaryum and Attalea palm trees that were taller and larger compared with random locations. Squirrels used all vertical strata of the forest, and the main behaviors observed were travel and forage. Behaviors occurred similarly across the day but differed by vertical strata. Although squirrels used vegetation communities different than available and selected for tree characteristics, site characteristics did not appear to be important in contrast with other tree squirrel species.

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Selection of Drey Sites by Abert's Squirrels in an Introduced Population

Cited by 24 publications

References 33 publications

Nest-Site Selection by the Mexican Red-Bellied Squirrel (Sciurus aureogaster) in MichoacáN, Mexico

Nest-Site Selection by the Mexican Red-Bellied Squirrel (Sciurus aureogaster) in MichoacáN, Mexico

Nest site selection by the hazel dormouse Muscardinus avellanarius: is safety more important than food?

Feeding behavior and activity patterns of Amazon red squirrels

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