Occurrence of epiphytic macrolichens in relation to tree species and age in managed boreal forest

Uliczka, Helen; Angelstam, Per

doi:10.1111/j.1600-0587.1999.tb00576.x

Cited by 94 publications

(95 citation statements)

References 12 publications

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“…These or closely related variables have been used in many ecological studies and shown to affect lichen species distribution or species richness patterns (e.g. Barkman 1958;Hyvärinen et al 1992;Uliczka & Angelstam 1999;Gustafsson et al 2004).…”

Section: Discussionmentioning

confidence: 99%

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Evaluating macrolichens and environmental variables as predictors of the diversity of epiphytic microlichens

et al. 2007

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Abstract:In contrast to the frequently assessed macrolichens, microlichens are rarely considered in biodiversity assessments despite their high species richness. Microlichens require generally a higher species identification effort than macrolichens. Thus, microlichens are more expensive to assess. Here we evaluate if macrolichen richness can be used as an indicator of total and threatened microlichen richness. Furthermore, we tested if different sets of environmental variables (modelled climatic variables, forest structure, altitude, etc.) improve the regression models based on macrolichens only or even replace the macrolichens as predictors. Multiple linear regressions were used to model species richness of microlichens, and Poisson regressions for threatened microlichens.On 237 forest plots (200 m 2 ) distributed randomly across Switzerland, 77 macrolichens and 219 microlichens occurred. Macrolichen richness was positively related to the richness of microlichens (R 2 adj. =0·27) and, in combination with threatened macrolichens as an additional predictor, also to the number of threatened microlichens (R 2 dev. =0·14). Environmental variables alone and in different combinations explained between 0·20 and 0·41 (R 2 adj. ) of the total variation of microlichen richness, and between 0·09 and 0·29 (R 2 dev. ) of the total variation of threatened microlichen richness. All models based on environmental variables were considerably improved when macrolichens were included. Furthermore, macrolichen richness turned out to be the most important variable in explaining species richness of all, as well as threatened microlichens. The best models for total microlichen richness reached a R 2 adj. of 0·56. Threatened microlichens were more difficult to model with the best model reaching a R 2 dev. of 0·29. We conclude that in biodiversity assessments with scarce resources, lichen sampling could be focused on the better known macrolichens, at least in many temperate lowland and mountain forests. In combination with environmental variables, reliable predictions of microlichen richness can be expected. If the focus is on threatened microlichens, however, models were not reliable and specialized taxonomists are necessary to assess these species in the field.

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Section: Discussionmentioning

confidence: 99%

“…Berglund & Jonsson 2001;Gustafsson et al 2004), variables related to the phorophyte (e.g. Hyvärinen et al 1992;Uliczka & Angelstam 1999), other abiotic variables such as altitude (Dietrich & Scheidegger 1997;Gustafsson et al 2004), and climatic variables (e.g. Werth et al 2005;Ellis & Coppins 2006).…”

Section: Introductionmentioning

confidence: 99%

Evaluating macrolichens and environmental variables as predictors of the diversity of epiphytic microlichens

et al. 2007

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“…Epiphytic lichens are well known to be sensitive to host tree species and forest structure and management (Barkman 1958;Dietrich & Scheidegger 1996;Uliczka & Angelstam 1999;Ihlen et al 2001;Johansson & Ehrlén 2003;Pykälä 2004). Although the forest types used here characterized very crudely the habitat requirements of the lichen species examined, for four out of the six species the forest types were important for modelling the species distributions.…”

Section: Spatial Predictive Models For Lichen Speciesmentioning

confidence: 99%

Predicting the potential spatial distributions of epiphytic lichen species at the landscape scale

Bolliger¹,

Bergamini²,

Stofer³

et al. 2007

The Lichenologist

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Abstract:The potential spatial distributions of six epiphytic lichen species were assessed in Switzerland (41 000 km 2 ) as a function of various key climatic drivers and forest types using logistic regression models. Cetrelia cetrarioides is 'near threatened', Lobaria pulmonaria is 'vulnerable', and Graphis scripta, Hypogymnia physodes, Lecanora cadubriae, Letharia vulpina are not endangered according to the Red List assessment based on IUCN criteria. Lichen presence and absence were derived from the SwissLichens database that contains spatially explicit information on both species presence and absence.The spatial lichen niches are predicted with R 2 values between 0·5 and 0·75 and AUC values between 0·63 and 0·94. Model evaluation shows that the models perform well.Lichenologists reviewed the spatial predictions of lichen species on the basis of their expert knowledge and concluded that parsimonious regression models may suffice for successful prediction of the potential spatial niche distributions of epiphytic lichen species.

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“…Such species are unlikely to reappear until the substrate conditions and sheltered microenvironments they require are present (Söderström 1988). Fennoscandian research (Gustafsson and Hallingbäck 1988, Söderström et al 1992, Berg et al 1994, Kuusinen 1994, Uliczka and Angelstam 1999 shows that non-vascular plants are at particular long-term risk from forest management practises that do not allow for recruitment of large old trees, large snags, coarse woody debris and deciduous trees and tall shrubs. In the North American boreal forest, the effects of forest practises on bryophyte and lichen communities are comparatively little studied (but see Selva 1994, Webb 1996, Crites and Dale 1997, Newmaster et al 1999, Pharo and Vitt 2000.…”

Section: Indicator Species or Species Group Responsesmentioning

confidence: 99%

Silvicultural disturbance severity and plant communities of the southern Canadian boreal forest

Haeussler¹,

Bedford²,

Leduc³

et al. 2002

Silva Fenn.

135

115

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Boreal forest ecosystems are adapted to periodic disturbance, but there is widespread concern that conventional forest practises degrade plant communities. We examined vegetation diversity and composition after clearcut logging, mechanical and chemical site preparation in eight 5-to 12-yr old studies located in southern boreal forests of British Columbia and Quebec, Canada to fi nd useful indicators for monitoring ecosystem integrity and to provide recommendations for the development and testing of new silvicultural approaches. Community-wide and species-specifi c responses were measured across gradients of disturbance severity and the results were explained in terms of the intermediate disturbance hypothesis and a simple regeneration model based on plant life history strategies. Species richness was 30 to 35% higher 5 to 8 years after clearcut logging than in old forest. Total and vascular species diversity generally peaked on moderately severe site treatments, while non-vascular diversity declined with increasing disturbance severity. On more-or-less mesic sites, there was little evidence of diversity loss within the range of conventional silvicultural disturbances; however, there were important changes in plant community composition. Removing soil organic layers caused a shift from residual and resprouting understory species to ruderal species regenerating from seeds and spores. Severe treatments dramatically increased non-native species invasion. Two important challenges for the proposed natural dynamics-based silviculture will be 1) to fi nd ways of maintaining populations of sensitive non-vascular species and forest mycoheterotrophs, and 2) to create regeneration niches for disturbance-dependent indigenous plants without accelerating non-native species invasion.

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Occurrence of epiphytic macrolichens in relation to tree species and age in managed boreal forest

Cited by 94 publications

References 12 publications

Evaluating macrolichens and environmental variables as predictors of the diversity of epiphytic microlichens

Evaluating macrolichens and environmental variables as predictors of the diversity of epiphytic microlichens

Predicting the potential spatial distributions of epiphytic lichen species at the landscape scale

Silvicultural disturbance severity and plant communities of the southern Canadian boreal forest

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