Den Tree Characteristics and Abundance in Florida and South Carolina

McComb, William C.; Bonney, Stephen A.; Sheffield, Raymond M.; Cost, Noel D.

doi:10.2307/3800967

Cited by 15 publications

(6 citation statements)

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“…Mature upland pine and pine-hardwood associations are considered preferred habitat of fox squirrels (Moore 1957, Loeb and Lennartz 1989, Weigl et al 1989). Southern yellow pine (P. echinata, P. taeda, P. palustris, and P. elliottii) species, which dominate these habitat types, are considered poor cavity producers (McComb et al 1986). Nixon and Hansen (1987) recommended 2-5 nesting cavities/ha to sustain high densities (5/ha) of midwestern fox squirrels.…”

Section: Discussionmentioning

confidence: 99%

Nest Characteristics of Sympatric Populations of Fox and Gray Squirrels

Edwards¹,

Guynn²

1995

The Journal of Wildlife Management

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Section: Discussionmentioning

confidence: 99%

Nest Characteristics of Sympatric Populations of Fox and Gray Squirrels

Edwards¹,

Guynn²

1995

The Journal of Wildlife Management

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“…In addition, invertebrate prey that are consumed by some species of arboreal marsupials and that are commonly associated with Eucalyptus and understory trees (Smith 1982, Woinarski and Cullen 1984) are rare or absent from P. radiata (see Suckling et al 1976). P. radiata trees, like many conifer species, are not prone to the development of cavities (McComb et al 1986), which means that such shelter sites are not available for use by arboreal marsupials. Almost all species of arboreal marsupials that occur in the Tumut region are dependent on large trees with hollows for nest sites (Gibbons and Lindenmayer 1997).…”

Section: Discussionmentioning

confidence: 99%

The Response of Arboreal Marsupials to Landscape Context: A Large-Scale Fragmentation Study

Lindenmayer

Cunningham

Pope

et al. 1999

Ecological Applications

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We describe a landscape‐scale study of fragmentation effects on arboreal marsupials at Tumut, southeastern Australia. Embedded within a 55000‐ha plantation of exotic Monterey pine (Pinus radiata) are 192 patches of remnant Eucalyptus forest, with large contiguous areas of eucalypt forest beyond the plantation boundary. We compared presence and estimated abundance of arboreal marsupials in three broad groups of sites: remnants of native Eucalyptus forest in the P. radiata plantation; P. radiata stands in the plantation; and large areas of contiguous Eucalyptus forest surrounding the plantation. The study animals were Trichosurus vulpecula, T. caninus, Petaurus breviceps, P. norfolcensis, P. australis, Acrobates pygmaeus, Pseudocheirus peregrinus, and Petauroides volans. We used randomized, replicated statistical procedures to sample 86 eucalypt remnants varying in size, shape, and other features. We matched 40 sites in large contiguous Eucalyptus forest to those remnants, based on environment, climate, terrain, and vegetation cover. In addition, 40 sites in P. radiata stands were matched to sites in the remnants and the large eucalypt forest on the basis of geology, climate, and terrain. We also surveyed 41 micropatches (remnants < 1 ha), where almost no animals were detected. These micropatches, smaller than the home ranges of most arboreal marsupials in the Tumut region, probably represent a minimum threshold patch size below which animals cannot survive. Highly significant landscape context effects were identified. P. radiata sites were excluded from analysis because few animals were detected there. P. australis and P. norfolcensis were not recorded in remnants. P. norfolcensis was recorded only once in contiguous eucalypt forest; P. australis was absent. Four species (P. volans, P. peregrinus, T. vulpecula, and T. caninus) occurred in sufficient numbers for statistical analyses of presence and abundance on remnants vs. large contiguous forest. P. volans was less likely to occur in remnants, whereas P. peregrinus was less likely to occur in contiguous eucalypt forest. Site context had no significant effect on presence of T. caninus, and arboreal marsupials per se, or on abundance of P. volans, T. vulpecula, T. caninus, and arboreal marsupials overall. P. peregrinus was significantly more abundant in remnants than in contiguous eucalypt forest. Statistical adjustment for environmental, climatic, terrain, and vegetation variables by regression modeling did not change animal abundance results. Similar outcomes were recorded for presence of T. vulpecula and T. caninus. However, context effects for presence of T. vulpecula, P. volans, and P. peregrinus could be explained by some of the vegetation, terrain, and landscape covariates. For P. volans, probability of occurrence was significantly greater in large remnants, sites on flat terrain, and sites dominated by particular eucalypt forest types. T. vulpecula was significantly more likely to occur in large remnants and sites with open understories. There was no evidenc...

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“…Some tree species are prone to decay and cavity formation (McClelland et al 1979;McComb et al 1986;Franklin et al 1987). These differences have been observed by many investigators and are well known to timber buyers.…”

Section: Factors Related To Cavity Tree Abundancementioning

confidence: 96%

Distribution of cavity trees in midwestern old-growth and second-growth forests

Fan¹,

Shifley²,

Spetich³

et al. 2003

Can. J. For. Res.

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Abstract:We used classification and regression tree analysis to determine the primary variables associated with the occurrence of cavity trees and the hierarchical structure among those variables. We applied that information to develop logistic models predicting cavity tree probability as a function of diameter, species group, and decay class. Inventories of cavity abundance in old-growth hardwood forests in Missouri, Illinois, and Indiana found that 8-11% of snags had at least one visible cavity (as visually detected from the ground; smallest opening ≥2 cm diameter), about twice the percentage for live trees. Five percent of live trees and snags had cavities on mature (≥110 years) second-growth plots on timberland in Missouri. Because snags accounted for typically no more than 10% of standing trees on any of these sites, 80-85% of cavity trees are living trees. Within the subset of mature and old-growth forests, the presence of cavities was strongly related to tree diameter. Classification and regression tree models indicated that 30 cm diameter at breast height (DBH) was a threshold size useful in distinguishing cavity trees from noncavity trees in the old-growth sample. There were two diameter thresholds in the mature second-growth sample: 18 and 44 cm DBH. Cavity tree probability differed by species group and increased with increasing decay class.Résumé : Nous avons utilisé la classification et l'analyse d'arbres de régression pour identifier les principales variables associées à l'occurrence d'arbres à cavité et la structure hiérarchique entre ces variables. Nous avons utilisé cette information pour développer des modèles de régression logistique visant à prédire la présence de cavités en fonction du diamètre, du groupe d'essences et de la classe de carie de l'arbre. Des inventaires d'abondance de cavités dans des forêts anciennes de feuillus au Missouri, en Illinois et en Indiana ont montré que 8-11 % des chicots ont au moins une cavité visible (détectée par examen visuel à partir du sol; diamètre de la plus petite ouverture ≥2 cm), soit le double du pourcentage correspondant pour les arbres vivants. Cinq pourcent des arbres vivants et des chicots avaient des cavités dans des placettes en forêt de seconde venue mature (≥110 ans) dans les régions boisées au Missouri. Étant donné que les chicots ne comptent typiquement pas pour plus de 10 % des arbres sur pied à chacun de ces sites, 80-85 % des arbres à cavités sont donc des arbres vivants. Si on prend en compte seulement les forêts matures et les forêts anciennes, la présence de cavités est fortement reliée au diamètre de l'arbre. Les modèles de classification et d'arbres de régression indiquent qu'un diamètre à hauteur de poitrine (DHP) de 30 cm constitue une taille seuil pour distinguer les arbres avec cavités de ceux sans cavités dans les forêts anciennes. Dans les forêts de seconde venue, il y a deux seuils : 18 et 44 cm DHP. La probabilité qu'un arbre ait une cavité varie selon les groupes d'essences et augmente avec la classe de carie.[Traduit par la ...

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Den Tree Characteristics and Abundance in Florida and South Carolina

Cited by 15 publications

References 0 publications

Nest Characteristics of Sympatric Populations of Fox and Gray Squirrels

Nest Characteristics of Sympatric Populations of Fox and Gray Squirrels

The Response of Arboreal Marsupials to Landscape Context: A Large-Scale Fragmentation Study

Distribution of cavity trees in midwestern old-growth and second-growth forests

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