Intraspecific Variations of Morphology and Physiology of Temperate to Arctic Populations of Cetraria Nivalis

Schipperges, Barbara; Kappen, L.; Sonesson, M.

doi:10.1017/s0024282995000648

Cited by 11 publications

(14 citation statements)

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“…: Sancho and Kappen, 1989). Perhaps this is due to variations between different populations, as has been shown for Cetraria nivalis (Schipperges et al, 1995). The significance of metabolic activity in many lichens under low temperature regimes and in cold climatic regions has now been repeatedly shown (Kappen, 1993;Schroeter et al, 1994;Schroeter and Scheidegger, 1995).…”

Section: Discussionmentioning

confidence: 89%

Field Measurements of Photosynthesis of Umbilicarious Lichens in Winter

et al. 1996

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The photosynthetic performance of Lasallia pustulata and Umbilicaria spodochroa was measured both in the field on granitic rock in southern Norway and in the laboratory under controlled conditions of light and temperature. In the field thallus temperatures varied between − 2 and + 5 °C during the daylight period in January 1994. In situ water contents were between 50 and 400% d.wt. in L. pustulata and between 100 and 500% d.wt. in U. spodochroa. The lichens were active during the whole period of investigation. Photosynthetic rates reached 13.03 μmol CO2 g Chl−1 s−1 in L. pustulata and 5.56 μmol CO2 g Chl−1 s−1 in U. spodochroa. Ice formation on the thallus surface did not impede CO2 exchange. Light was mainly the limiting factor, as could be confirmed by the laboratory experiments. In general, habitat conditions never provided optimum photosynthetic rates but photosynthetic carbon balance was positive during 4 of the 5 days investigated. The coldest day was photosynthetically almost as efficient as the warmest day during this period.

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Section: Discussionmentioning

confidence: 89%

Field Measurements of Photosynthesis of Umbilicarious Lichens in Winter

et al. 1996

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“…The studies by Benowicz et al ( 2000 ), Gornall and Guy ( 2007 ), and Soolanayakanahally et al ( 2009 ) suggest that a greater rate of photosynthesis in high-latitude tree genotypes is an adaptation to short growing season length. A trend toward increasing rates of net photosynthesis in relation to increasing latitude of origin has been seen in several plants (Reich et al, 1996 ), and even lichens (Schipperges et al, 1995 ). A similar relationship appears to exist with elevation.…”

Section: Discussionmentioning

confidence: 90%

Comparative physiology of allopatric Populus species: geographic clines in photosynthesis, height growth, and carbon isotope discrimination in common gardens

et al. 2015

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Populus species with wide geographic ranges display strong adaptation to local environments. We studied the clinal patterns in phenology and ecophysiology in allopatric Populus species adapted to similar environments on different continents under common garden settings. As a result of climatic adaptation, both Populus tremula L. and Populus balsamifera L. display latitudinal clines in photosynthetic rates (A), whereby high-latitude trees of P. tremula had higher A compared to low-latitude trees and nearly so in P. balsamifera (p = 0.06). Stomatal conductance (gs) and chlorophyll content index (CCI) follow similar latitudinal trends. However, foliar nitrogen was positively correlated with latitude in P. balsamifera and negatively correlated in P. tremula. No significant trends in carbon isotope composition of the leaf tissue (δ13C) were observed for both species; but, intrinsic water-use efficiency (WUEi) was negatively correlated with the latitude of origin in P. balsamifera. In spite of intrinsically higher A, high-latitude trees in both common gardens accomplished less height gain as a result of early bud set. Thus, shoot biomass was determined by height elongation duration (HED), which was well approximated by the number of days available for free growth between bud flush and bud set. We highlight the shortcoming of unreplicated outdoor common gardens for tree improvement and the crucial role of photoperiod in limiting height growth, further complicating interpretation of other secondary effects.

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“…Secondly, since the plasticity required for acclimatization has a genetic basis (e.g. Schipperges, Kappen & Sonesson 1995), it is crucial to sustain large‐enough populations of lichens to contain genetic variability for the future evolution of plasticity in the rapidly changing modern landscapes (Ghalambor et al. 2007).…”

Section: Discussionmentioning

confidence: 99%

Lichen acclimatization on retention trees: a conservation physiology lesson

Jairus

Lõhmus

2009

Journal of Applied Ecology

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Summary1. Green-tree retention (GTR) has been suggested as a means to effectively support epiphytic lichen species in managed forests, given the low lichen mortality on retention trees in the short term. However, a long-term perspective requires a physiological understanding of lichen responses to logging. This study compares anatomical, morphological and physiological traits of lichens on retention trees and on intact forest trees. 2. Thalli of nine taxa (Buellia griseovirens, Cladonia digitata, Hypogymnia physodes, Lecanora allophana, Lecanora pulicaris, Lepraria spp., Peltigera praetextata, Pertusaria amara and Phlyctis argena) were sampled from birch Betula spp. and aspen Populus tremula in GTR cuts, where they had previously been reported to survive well, and in adjacent managed forests. In the laboratory, chlorophyll fluorescence parameter F v ⁄ F m , thickness of the upper cortex, photobiont to mycobiont ratio and (in Lecanora species) the relative area of the apothecia were measured. 3. All the lichen samples collected from GTR cuts appeared alive, but their F v ⁄ F m was significantly lower, relative areas of the apothecia were larger and the upper cortices of thalli were thicker compared with the samples from adjacent forests. No difference in photobiont to mycobiont ratio was found. These patterns were broadly consistent among species, indicating a common mechanism: while suffering from photoinhibition, the lichens had acclimatized to the open conditions and increased their investment to sexual reproduction in a few years. 4. Synthesis and applications. The study highlights the value of a morpho-physiological framework for conservation management by pointing out that, in GTR areas, lichen survival is high-irradiation limited and heavily dependent on phenotypic plasticity. A thin upper cortex may be a common feature of the most sensitive species. To sustain epiphyte populations in managed forests, precautionary harvesting strategies (gradual felling; group-retention; extended rotations) should be preferred and large-enough populations should be preserved, even though short-term studies suggest a high survival of lichens in cut areas.

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Intraspecific Variations of Morphology and Physiology of Temperate to Arctic Populations of Cetraria Nivalis

Cited by 11 publications

References 0 publications

Field Measurements of Photosynthesis of Umbilicarious Lichens in Winter

Field Measurements of Photosynthesis of Umbilicarious Lichens in Winter

Comparative physiology of allopatric Populus species: geographic clines in photosynthesis, height growth, and carbon isotope discrimination in common gardens

Lichen acclimatization on retention trees: a conservation physiology lesson

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