An Ecophysiological Approach to Quantifying Nitrogen Fixation by Lobaria oregana

Antoine, Marie E.

doi:10.1639/0007-2745(2004)107[82:aeatqn]2.0.co;2

Cited by 102 publications

(66 citation statements)

References 20 publications

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“…All Rights Reserved. [Basilier et al, 1978] TU 1.0-6.4 (4) [Crittenden, 1975] TU 0.0062-0.17 [Forman and Dowden, 1977] TU 0.022-0.18 (3) b [Granhall and Selander, 1973] TU 0.16-9.4 (2) [Gunther, 1989] TU 0.0025-0.01 (3) [Henry and Svoboda, 1986] TU 0.085-0.1 (2) [Kallio, 1975] TU 0.15-0.38 (3) [DeLuca et al, 2002] BO-F 0.17 [Gunther, 1989] BO-F 0.005-0.045 (2) [Huss-Danell, 1977] BO-F 0.1 [Lagerström et al, 2007] BO-F 0.05-0.2 (3) [Zackrisson et al, 2004] BO-F 0.025-0.15 (3) b [Zackrisson et al, 2009] BO-F 0.16 [Antoine, 2004] TE-C 0.15-1.65 (5) [Brown and Dalton, 2002] TE-C 0.2 [Denison, 1973] TE-C 0.59 b [Denison, 1979] TE-C 0.4 [Granhall and Lindberg, 1978] TE-C 0.035 [Green et al, 1980] TE-C 0.5 b [Pike, 1978] TE-C 0.45 [Sucoff, 1979] TE-C 0.006-0.24 (4) [Belnap, 2002] [Zhao et al, 2010] DE 0.4 [Crews et al, 2001] TR-F 0.1-0.2 (3) [Cusack et al, 2009] TR-F 0.38 TR-F 0.02-0.045 (3) [Matzek and Vitousek, 2003] TR-F 0.008-0.06 (6) [Forman, 1975] TR-C 0.48 [Freiberg, 1998] TR-C 0.35 b [Matzek and Vitousek, 2003] TR-C 0.004-0.04 (6) a Biomes are abbreviated as follows: TU = tundra, BO-F = boreal forest floor, TE-C = temperate evergreen canopy, DE = desert, TR-F = tropical rainforest floor, and TR-C = tropical rainforest canopy. Some studies provide more than one observed value (e.g., due to different habitats).…”

Section: Chemical Weatheringmentioning

confidence: 99%

Estimating impacts of lichens and bryophytes on global biogeochemical cycles

Porada

Weber

Elbert

et al. 2014

Global Biogeochemical Cycles

124

107

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Lichens and bryophytes may significantly affect global biogeochemical cycles by fixation of nitrogen and biotic enhancement of surface weathering rates. Most of the studies suggesting these effects, however, are either conceptual or rely on upscaling of regional estimates to obtain global numbers. Here we use a different method, based on estimates of net carbon uptake, to quantify the impacts of lichens and bryophytes on biogeochemical cycles at the global scale. We focus on three processes, namely, nitrogen fixation, phosphorus uptake, and chemical weathering. Our estimates have the form of potential rates, which means that we quantify the amount of nitrogen and phosphorus needed by the organisms to build up biomass, also accounting for resorption and leaching of nutrients. Subsequently, we use potential phosphorus uptake on bare ground to estimate chemical weathering by the organisms, assuming that they release weathering agents to obtain phosphorus. The predicted requirement for nitrogen ranges from 3.5 to 34 Tg yr −1 and for phosphorus it ranges from 0.46 to 4.6 Tg yr −1 . Estimates of chemical weathering are between 0.058 and 1.1 km 3 yr −1 of rock. These values seem to have a realistic order of magnitude, and they support the notion that lichens and bryophytes have the potential to play an important role for biogeochemical cycles.

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Section: Chemical Weatheringmentioning

confidence: 99%

Estimating impacts of lichens and bryophytes on global biogeochemical cycles

Porada

Weber

Elbert

et al. 2014

Global Biogeochemical Cycles

124

107

View full text Add to dashboard Cite

show abstract

“…The most common type of cyanobacterial lichen photobiont is Nostoc (Nostocaceae) (Antoine, 2004;Nash, 2008a), which is the symbiont associated with members of the lichen-forming fungal genus Peltigera (Tschermak-Woess, 1988;Miadlikowska & Lutzoni, 2004;O'Brien et al, 2005;Hodkinson et al, 2012a), the group that is the focus of our research (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Lichen-symbiotic cyanobacteria associated withPeltigerahave an alternative vanadium-dependent nitrogen fixation system

Hodkinson

Allen

Forrest

et al. 2014

European Journal of Phycology

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In past decades, environmental nitrogen fixation has been attributed almost exclusively to the action of enzymes in the wellstudied molybdenum-dependent nitrogen fixation system. However, recent evidence has shown that nitrogen fixation by alternative pathways may be more frequent than previously suspected. In this study, the nitrogen fixation systems employed by lichen-symbiotic cyanobacteria were examined to determine whether their diazotrophy can be attributed, in part, to an alternative pathway. The mining of metagenomic data (generated through pyrosequencing) and PCR assays were used to determine which nitrogen-fixation systems are present in cyanobacteria from the genus Nostoc associated with four samples from different geographical regions, representing different lichen-forming fungal species in the genus Peltigera. A metatranscriptomic sequence library from an additional specimen was examined to determine which genes associated with N 2 fixation are transcriptionally expressed. Results indicated that both the standard molybdenum-dependent system and an alternative vanadium-dependent system are present and actively transcribed in the lichen symbiosis. This study shows for the first time that an alternative system is utilized by cyanobacteria associated with fungi. The ability of lichen-associated cyanobacteria to switch between pathways could allow them to colonize a wider array of environments, including habitats characterized by low temperature and trace metal (e.g. molybdenum) availability. We discuss the implications of these findings for environmental studies that incorporate acetylenereduction assay data.

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“…Birds, rodents, and invertebrates also use these pendulous, hair-like species for nesting materials and shelter (Hayward andRosentreter 1994, Pettersson et al 1995). ·yr -1 at some high biomass sites in the western Cascades of Oregon (Antoine 2004). These lichens, like many others, are critical components of western ecosystems and directly influence forest health.…”

Section: Introductionmentioning

confidence: 99%

Lichen bioindication of biodiversity, air quality, and climate: baseline results from monitoring in Washington, Oregon, and California.

Jovan¹

2008

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An Ecophysiological Approach to Quantifying Nitrogen Fixation by Lobaria oregana

Cited by 102 publications

References 20 publications

Estimating impacts of lichens and bryophytes on global biogeochemical cycles

Estimating impacts of lichens and bryophytes on global biogeochemical cycles

Lichen-symbiotic cyanobacteria associated withPeltigerahave an alternative vanadium-dependent nitrogen fixation system

Lichen bioindication of biodiversity, air quality, and climate: baseline results from monitoring in Washington, Oregon, and California.

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