Lichen and bryophyte distribution on oak in London in relation to air pollution and bark acidity

Larsen, Rasmus Stenbak; Bell, J.N.B.; James, Paul W.; Chimonides, P.J.; Rumsey, Fred; Tremper, Anja H.; Purvis, O. W.

doi:10.1016/j.envpol.2006.03.033

Cited by 116 publications

(62 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Our methods are not an exact match with any previous CLE studies. Also, several species-focused studies highlight the individuality of species' responses to N pollutants (e.g., Davies et al 2007, Larsen et al 2007, McCune and Geiser 2009) and so potentially different eutrophs differ in their tolerances to different N pollutants. Moreover, it may well be that the NH 3 -specificity of a eutroph index is conditional, arising when available substrates are acidic (see Oak bole pH, below).…”

Section: Deposition Vs Gas Concentrationsmentioning

confidence: 99%

Eutrophic lichens respond to multiple forms of N: implications for critical levels and critical loads research

Jovan

Riddell

Padgett

et al. 2012

Ecological Applications

View full text Add to dashboard Cite

Abstract. Epiphytic lichen communities are highly sensitive to excess nitrogen (N), which causes the replacement of native floras by N-tolerant, ''weedy'' eutrophic species. This shift is commonly used as the indicator of ecosystem ''harm'' in studies developing empirical critical levels (CLE) for ammonia (NH 3 ) and critical loads (CLO) for N. To be most effective, empirical CLE and/or CLO must firmly link lichen response to causal pollutant(s), which is difficult to accomplish in field studies in part because the high cost of N measurements limits their use. For this case study we synthesized an unprecedented array of atmospheric N measurements across 22 long-term monitoring sites in the Los Angeles Basin, California, USA: gas concentrations of NH 3 , nitric acid (HNO 3 ), nitrogen dioxide, and ozone (n ¼ 10 sites); N deposition in throughfall (n ¼ 8 sites); modeled estimates of eight different forms of N (n ¼ 22 sites); and nitrate deposition accumulated on oak twigs (n ¼ 22 sites). We sampled lichens on black oak (Quercus kelloggii Newb.), and scored plots using two indices of eutroph (N tolerant species) abundance to characterize the community-level response to N. Our results contradict two common assertions about the lichen-N response: (1) that eutrophs respond specifically to NH 3 and (2) that the response necessarily depends upon the increased pH of lichen substrates. Eutroph abundance related significantly but weakly to NH 3 (r 2 ¼ 0.48). Total N deposition as measured in canopy throughfall was by far the best predictor of eutroph abundance (r 2 ¼ 0.94), indicating that eutrophs respond to multiple forms of N. Most N variables had significant correlations to eutroph abundance (r 2 ¼ 0.36-0.62) as well as to each other (r 2 ¼ 0.61-0.98), demonstrating the risk of mistaken causality in CLE/CLO field studies that lack sufficient calibration data. Our data furthermore suggest that eutroph abundance is primarily driven by N inputs, not substrate pH, at least at the high-pH values found in the basin (4.8-6.1). Eutroph abundance correlated negatively with trunk bark pH (r 2 ¼ 0.43), exactly the opposite of virtually all previous studies of eutroph behavior. This correlation probably results because HNO 3 dominates N deposition in our study region.

show abstract

Section: Deposition Vs Gas Concentrationsmentioning

confidence: 99%

Eutrophic lichens respond to multiple forms of N: implications for critical levels and critical loads research

Jovan

Riddell

Padgett

et al. 2012

Ecological Applications

View full text Add to dashboard Cite

show abstract

“…N deposition alters bark pH which is known to influence epiphytic communities [29], [30]. The relationship between lower plant frequency and bark pH confirmed that pH was an important driver for the distribution of lichens and bryophytes [30]. As the ammonia alters the bark pH, this process provides a better surrounding for algal growth.…”

Section: Discussionmentioning

confidence: 70%

“…The pH of bark is a sensitive factor responding to relatively small changes in the habitat acidification [28]. N deposition alters bark pH which is known to influence epiphytic communities [29], [30]. The relationship between lower plant frequency and bark pH confirmed that pH was an important driver for the distribution of lichens and bryophytes [30].…”

Section: Discussionmentioning

confidence: 78%

See 1 more Smart Citation

Bark pH as a factor affecting the density of epiphytic terrestrial algae in Taman Wetland Putrajaya, Malaysia

2015

J. appl. phys. sci.

View full text Add to dashboard Cite

“…In Brazil, there is only a record of host trees in mangrove regions (Marcelli 1992), while for trees from native Araucaria forests, Pinus and Eucalyptus monocultures, so far almost no data has been published (but see Kaffer et al 2009). In regions of Europe and North America, studies indicate that conifers usually have low pH, with variations between 3.0 and 6.0 (Hale 1983;Sillet et al 2000a;Kermit & Gauslaa 2001;Löbel et al 2006;Wolseley et al 2006;Larsen et al 2007). For the FLONA areas, individuals from the same species, as for example, A. angustifolia, Pinus taeda and P. elliottii and from the same genus, as Eucalyptus sp.…”

Section: Sticta Weigelii Xmentioning

confidence: 99%

Distribution and composition of the lichenized mycota in a landscape mosaic of southern Brazil

2010

View full text Add to dashboard Cite

RESUMO -(Distribuição e composição da micota liquenizada corticícola em um mosaico de paisagem do sul do sul do Brasil). Os fungos liquenizados são componentes epífi tos em áreas fl orestais, sendo que as ações antrópicas podem ocasionar modifi cações na composição e distribuição espacial das espécies. O objetivo deste trabalho é avaliar como a comunidade liquênica corticícola está distribuída na vegetação nativa e plantada, além de investigar uma possível manifestação de preferência da comunidade liquênica por forófi to e sua relação com o pH da casca dos mesmos. Foram analisados 120 forófi tos distribuídos em 12 manchas de vegetação nativa e plantada: Floresta Ombrófi la Mista, Plantações de Araucária, Pinos e Eucaliptos. Amostras adicionais de fungos liquenizados foram coletadas em todas as manchas de vegetação e/ou trilhas que levavam a estas, em coletas denominadas não sistemáticas. Foram registrados 113 táxons de fungos liquenizados, sendo 78 espécies no levantamento de comparação entre ambientes e 35 acrescentadas através das coletas adicionais. A maior diversidade de espécies foi registrada na Plantação de Araucária, enquanto que a maior ocorrência de táxons de ambientes sombreados foi verifi cada nas manchas da Floresta Ombrófi la Mista. O maior número de táxons liquênicos foi registrado em forófi tos com pH da casca básico. As variações registradas na composição e distribuição da comunidade liquênica podem estar relacionadas às características dos forófi tos encontrados nestas áreas. Palavras-chave: Composição, liquens, forófi tos, Floresta de Araucária, pH da casca ABSTRACT -(Distribution and composition of the lichenized mycota in a landscape mosaic of southern Brazil). Lichenized fungi are epiphytic components of forest areas where anthropogenic activities may cause changes in species composition and spatial distribution. The aim of this work is to evaluate how the lichen community is distributed on native and planted vegetation, and also to investigate possible preferences of the lichen community for specifi c host trees related to bark pH values. A total of 120 host-trees distributed in 12 remnants of native and planted vegetation were analyzed: native Araucaria forest and Araucaria, pine and eucalyptus plantations. Additional samples of lichenized fungi were collected in all vegetation types and adjacent trails, using a non-systematic sampling protocol. One hundred thirteen taxa of lichenized fungi were recorded, of which 78 species originated from the survey comparing the four habitats and 35 were added by additional collections. The highest species diversity was recorded in the Araucaria plantation while the greatest occurrence of shade tolerant taxa was found in the native Araucaria forest type. The largest number of lichen taxa was recorded on host-trees with basic bark pH. The wide variety of lichen community composition and distribution registered may be related to the host-tree characteristics found in these areas.

show abstract

Lichen and bryophyte distribution on oak in London in relation to air pollution and bark acidity

Cited by 116 publications

References 30 publications

Eutrophic lichens respond to multiple forms of N: implications for critical levels and critical loads research

Eutrophic lichens respond to multiple forms of N: implications for critical levels and critical loads research

Bark pH as a factor affecting the density of epiphytic terrestrial algae in Taman Wetland Putrajaya, Malaysia

Distribution and composition of the lichenized mycota in a landscape mosaic of southern Brazil

Contact Info

Product

Resources

About