Geochemical Control of Saxicolous Lichen Communities on the Creggaun Gabbro, Letterfrack, Co. Gal Way, Western Ireland

Boyle, A. P.; McCarthy, Patrick M.; Stewart, Dylan

doi:10.1017/s0024282987000276

Cited by 14 publications

(12 citation statements)

References 5 publications

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“…Werner 1956), and studies that directly associate quantitatively assessed mineralogy or elemental chemistry of host rocks to the presence of lichen species or the assemblage of lichen communities are rare (e.g. Boyle et al 1987). The exact nature of this substra tum-level influence on lichens (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…Our study is one of only a few to relate lichen occurrence to geochemistry of indi vidual rocks (Boyle et al 1987) (Table 2). Only four species were shared in common between all three substrata, suggesting sub stantial differences in lichen community composition between ultramafic and non ultramafic rocks at both the species and generic levels (Tables 5 & 6).…”

Section: Ultramafic Genusmentioning

confidence: 99%

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Investigation of the importance of rock chemistry for saxicolous lichen communities of the New Idria serpentinite mass, San Benito County, California, USA

Rajakaruna¹,

Knudsen

Fryday

et al. 2012

The Lichenologist

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Although several lichen inventories exist for European ultramafic sites, only four surveys of serpentine lichens for North America have been published to date. Of those, only one has been conducted in California. We conducted a survey of saxicolous lichens from ultramafic rocks (including nephrite, partially serpentinized peridotite, and serpentinite) and non-ultramafic rocks (including silica-carbonate, shale, and sandstone) at the New Idria serpentinite mass, San Benito County, California. X-ray Fluorescence Analysis of the rocks from which the lichens were collected revealed significant elemental differences between the ultramafic and non-ultramafic rocks for 26 of the 32 major and trace elements analyzed. We identified a total of 119 species of lichenized and lichenicolous fungi; 60 species were restricted to ultramafic substrata, 19 to silica-carbonate, and 15 to shale and sandstone. Only 4 species were shared in common. A permutational multivariate analysis of variance (perMANOVA) test revealed significant differences in lichen assemblages between ultramafic and non-ultramafic rocks at the species level but not at the generic level, with species richness (alpha-diversity) significantly greater at the ultramafic sites. We suggest that, although differences in geochemistry clearly influence the lichen community composition, other factors, especially substratum age and the physical characteristics of the rock, are of equal, if not greater, importance. Of all the species collected, six, Buellia aethalea, B. ocellata, Caloplaca oblongula, Rhizocarpon saurinum, Thelocarpon laureri, and Trapelia obtegens, are reported new to California, along with an apparently previously undescribed Solenopsora sp. The rest of the species encountered are relatively frequent in the lichen flora of southern and central California, except Aspicilia praecrenata, a rare California endemic that we collected on both ultramafic and non-ultramafic rocks.

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Section: Discussionmentioning

confidence: 99%

Section: Ultramafic Genusmentioning

confidence: 99%

Investigation of the importance of rock chemistry for saxicolous lichen communities of the New Idria serpentinite mass, San Benito County, California, USA

Rajakaruna¹,

Knudsen

Fryday

et al. 2012

The Lichenologist

View full text Add to dashboard Cite

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“…Although lichenologists have appealed to geochemistry to explain dierences among lichen communities (Gilbert & Fox 1986;Boyle et al 1987;Hovenden & Seppelt 1995), nutrient supply, which will vary depending on the substrate, has not been tested explicitly as a factor that could limit lichens' distribution or abundance. Nitrogen-®xing lichens, in particular, may be sensitive to changes in the availability of phosphorus or molybdenum (Crittenden et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Controls over the accumulation and decline of a nitrogen‐fixing lichen,Stereocaulon vulcani, on young Hawaiian lava flows

Kurina

Vitousek

1999

Journal of Ecology

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Summary 1The abundance of the nitrogen-®xing lichen colonist, Stereocaulon vulcani, was determined on a matrix of sites on the north-east slope of Mauna Loa volcano, Hawaii. 2 Rates of lichen colonization and accumulation were highest at low elevation, where conditions are warm and wet, but lichens persisted longest in the colder, drier, higher elevation sites. 3 An analysis of lichen abundance data from Mauna Loa's north-east slope, together with data from sites located on dierent aspects of Mauna Loa volcano and Kilauea volcano, showed that lichen accumulation on the youngest lava¯ows was limited most strongly by precipitation rather than by temperature. 4 Fertilization experiments showed that at high elevation (1800 m) rates of both nitrogen and carbon uptake were more strongly nutrient-limited in lichens living on an older lava¯ow (142 years) than in lichens living on a younger lava¯ow (52 years). Decline of S. vulcani at high elevation may therefore be related to nutrient limitation. 5 An 80% reduction in direct light on the younger¯ow at low elevation decreased rates of nitrogen assimilation and nitrogen content signi®cantly, suggesting that lichen decline here is most probably due to light limitation as a result of shading by vascular plants.

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“…The percentage of available ions is difficult to assess, as the potential role of secondary metabolites in element uptake from bark is unknown. Studies with oxalic acid (BOYLE et al 1987) and with lichen substances such as depsides and depsidones (SYERS 1969;ISKANDAR & SYERS 1972;ASCASO & GALVAN 1976) suggest that these metabolites can release cations from rock. Since we aimed at coming closer to field conditions with our Mn toxicity studies, we carried out a culture experiment with 36 soredia of H. physodes with a considerably lower MnCl 2 concentration compared to HAUCK et al (2002 d).…”

Section: Discussionmentioning

confidence: 99%

Manganese as a site factor for epiphytic lichens

Hauck

Alexander

2005

The Lichenologist

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Decreasing abundance of epiphytic lichens with increasing Mn supply from the substratum or from stemflow was found in several coniferous forests of Europe (Germany) as well as western (Montana, British Columbia) and eastern North America (New York State). Experiments carried out with Hypogymnia physodes and other species of chloro- and cyano-lichens suggest that these correlations are causal. High Mn concentrations e.g. reduce chlorophyll concentrations, chlorophyll fluorescence and degrade the chloroplast in lichen photobionts. Excess Mn inhibits the growth of soredia of H. physodes and causes damage in the fine- and ultra-structure of the soredia. Adult lichen thalli remain structurally unaffected by Mn. Manganese uptake does not result in membrane damage. Calcium, Mg, Fe and perhaps also Si alleviate Mn toxicity symptoms in H. physodes. Lecanora conizaeoides is not sensitive to Mn in laboratory experiments or in the field. The data suggest that high Mn concentrations are an important site factor for epiphytic lichens in coniferous forests that until recently has been overlooked. Manganese reaching the microhabitat of epiphytic lichens is primarily soil-borne and is usually not derived from pollution.

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Geochemical Control of Saxicolous Lichen Communities on the Creggaun Gabbro, Letterfrack, Co. Gal Way, Western Ireland

Cited by 14 publications

References 5 publications

Investigation of the importance of rock chemistry for saxicolous lichen communities of the New Idria serpentinite mass, San Benito County, California, USA

Investigation of the importance of rock chemistry for saxicolous lichen communities of the New Idria serpentinite mass, San Benito County, California, USA

Controls over the accumulation and decline of a nitrogen‐fixing lichen,Stereocaulon vulcani, on young Hawaiian lava flows

Manganese as a site factor for epiphytic lichens

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