Distribution of Corticolous Noncrustose Lichens on Trunks of Rocky Mountain Junipers in Boulder County, Colorado

Peard, J.L.

doi:10.2307/3242712

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…The existence of scaling was found to require at least some loss of individuals after their initial establishment, with the possibility of establishment of new individuals as time passes. In a similar study, Peard (1983) reported that reduced cover of corticolous lichens on junipers is due primarily to the rapid exfoliation rate of the young bark caused by wind. It seems possible that water currents and abrasion caused by water-borne materials increase the rate of exfoliation and/or interfere with colonization.…”

Section: Discussionmentioning

confidence: 89%

Effects of Water Transported Sediment on Corticolous Lichen Communities

Beckelhimer

Weaks

1986

The Lichenologist

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The spatial distribution of corticolous lichens was studied along Big Seven Mile Creek (Cabell County, West Virginia, U.S.A.), a small stream that was periodically inundated by floodwaters carrying heavy loads of sediment. Lichen communities located at 0, 1.0 and 1.5 km from the confluence with the Ohio River were compared using step-wise discriminant analysis, a multivariate technique. Of the physical factors tested, the results indicated that the sediment on the tree boles was the most important factor separating the three stations and bole heights. Species richness was established to be an important mensurational variable separating stations, bole heights, and parallel and perpendicular transects. Changes observed in lichen community structure are assumed to have resulted from microclimatic variation brought about primarily by sedimentation associated with flooding. Failure of the physical factors and biotic variables to separate tree bole aspects (faces of boles in respect to the stream) indicate that abrasion and current-induced exfoliation are not important factors affecting lichen communities in the study area. Corticolous lichens occurring along streams subject to periodic inundation may represent a useful indicator in studies of flooding, water quality, and/or sedimentation in watersheds.

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Section: Discussionmentioning

confidence: 89%

Effects of Water Transported Sediment on Corticolous Lichen Communities

Beckelhimer

Weaks

1986

The Lichenologist

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“…Substrate flaking was also considered to be a feature affecting Juniperus scopulorum Sarg. (Peard 1983) and Quercus spp. (Adams & Risser 1971) lichen communities.…”

Section: Species Responsesmentioning

confidence: 98%

Ecology of the corticolous lichens on Pinus radiata at five sites of increasing age near Linton, Victoria, Australia

Griffin

Conran

1994

Australian Journal of Ecology

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Thirteen lichen species were studied on trunk segments of Pinus radiata D.Don between 1.0 and 1.5 m above-ground from five plantings of known, different ages near Linton, Victoria. Significant frequency and size-class differences were found for most species between sites. These parameters generally increased up to 32 years, and then either declined or showed evidence of recolonization by small thallus size-classes in some species. Nevertheless, only relict populations for any species were present at 52 years. Most species had no aspect preferences; only three species had a significant majority of their thalli on the western trunk face. Site-species association frequency analyses clustered, as pairs, the 11 and 52, and 16 and 39 year old sites. These site patterns were correlated with a number of environmental factors as well as species abundance at the sites, but there is also a possible response by the community to bark shedding, seen after 32 years, with a return to earlier colonization states in the system. This cyclic pattern is similar to a competitive hierarchy succession, although due to accelerating chronic disturbance (bark shedding) the system may be subject to secondary succession and, ultimately, to severe degradation.

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“…Moisture gradients on the trunk vary with the directional position and influence lichen activity (Rogers 1988). In Colorado, Peard (1983) found the south and west sides of a tree trunk to be harsher microclimates due to greater exposure to solar radiation and winds. Several studies show an increase in lichen abundance on the north and east aspects of trees (Eversman 1982, Gough 1975, Jonescu 1970, Peard 1983).…”

mentioning

confidence: 99%

“…In Colorado, Peard (1983) found the south and west sides of a tree trunk to be harsher microclimates due to greater exposure to solar radiation and winds. Several studies show an increase in lichen abundance on the north and east aspects of trees (Eversman 1982, Gough 1975, Jonescu 1970, Peard 1983). However, lichens in this study were found to be most abundant on the south sides of both tree species (Figures 3 and 4).…”

mentioning

confidence: 99%

Composition and cover of epiphtyic lichens on Pseudtosuga (sic) menziesii and Populus tremuloides in southwestern Idaho

Martin¹,

Novak²

1999

Evansia

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Species composition and percent cover of epiphytic lichens were determined on trunks of Pseudotsuga menziesii and Populus tremuloides at two study sites in Southwest Idaho: Marshall Lake Trail and Mores Mountain. In this study, we tested whether bark pH and directional position on the tree trunk influenced the distribution of lichens on these two tree species. Forty trees were examined using a 5X10 cm quadrat to determine lichen cover in the four cardinal directions. Five lichen species were found on P. menziesii at the Marshall Lake Trail study site and six at the Mores Mountain study site. Three different lichen species were found on P. tremuloides at Marshall Lake Trail site: where as no lichens were detected on P. tremuloides at the Mores Mountain site. For both tree species, lichens were most abundant on the south aspect of the tree trunks. This result differs from other studies, and may be due to optimal lichen growth conditions occurring on the south aspect of tree trunks during cooler and moister winter season, at these arid study sites.Introduction. Typically, the bark of deciduous trees is more basic than the bark of conifers. Lichens can produce secondary chemicals that change the chemistry and texture of their substrate, making bark a more suitable habitat for further colonization by lichens and expansion of lichen thalli (Rogers 1988). Bark pH influences availability of minerals and organic substances, changes in diffusion rates and toxicity of the substrate (Brodo, 1973). Hardwood gaps in forests can greatly boost lichen diversity (Neitlich and McCune 1997). The hardwood species in this study, Populus tremuloides, is one of the most geographically wide spread deciduous trees in North America (Jonescu 1970) and stands of this tree species are distributed throughout Idaho. Stands of P. tremula in Europe are scattered throughout conifer forests, often support a variety of threatened lichen species and increasing the biodiversity of the lichen flora in these forests (Gustafsson and Eriksson 1995).This study investigated the composition and cover of lichens on two tree species: Populus tremuloides Michx. and Pseudotsuga menziesii (Mirbel) Franco. We hypothesized that differences in lichen composition may be related to differences in bark pH of the two trees, and that differences in cover should be related to the aspect of the trunk for both species. Varying lichen occurrences have been found to reflect differences in moisture levels, temperature, light and stability of conditions (Eversman 1982). Many studies show an increase in lichen abundance on the north and east sides of trees due to cooler and moister microclimates (Eversman 1982, Gough 1975, Jonescu 1970, Peard 1988. In some climates, the conditions associated with the north side of a tree trunk allows lichen species more time to photosynthesize and obtaining maximal growth, before daily desiccation during the summer (Eversman 1982). Morphology of the bark may also play a role in the colonization of lichen species. For instance, P. tremuloides ty...

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Distribution of Corticolous Noncrustose Lichens on Trunks of Rocky Mountain Junipers in Boulder County, Colorado

Cited by 5 publications

References 17 publications

Effects of Water Transported Sediment on Corticolous Lichen Communities

Effects of Water Transported Sediment on Corticolous Lichen Communities

Ecology of the corticolous lichens on Pinus radiata at five sites of increasing age near Linton, Victoria, Australia

Composition and cover of epiphtyic lichens on Pseudtosuga (sic) menziesii and Populus tremuloides in southwestern Idaho

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