Seasonal Growth Dynamics in the Lichen Lobaria pulmonaria

Muir, Patricia S.; Shirazi, A.M.; Patrie, James

doi:10.1639/0007-2745(1997)100[458:sgditl]2.0.co;2

Cited by 52 publications

(48 citation statements)

References 18 publications

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“…Unlike southeastern Canada (this study), Oregon has wet, mild winters and relatively dry summers, and daily maximum temperatures are rarely below 0°C. Thus, the lichens were exposed to more liquid water and metabolically active temperatures in winter in the Muir et al (1998) study than our lichen population, which is rarely exposed to drought conditions at metabolically permissive temperatures. In summer they exist in the dark and moist understorey of a swampy maple forest.…”

Section: Discussionmentioning

confidence: 92%

“…The reversal of the seasonal patterns of realised electron transport measured at the ®eld-ambient temperature, however, showed the greater and overwhelming importance of temperature in determining the realised performance. Muir et al (1998) have shown greatest growth rates of L. pulmonaria during the winter months in western Oregon USA. Unlike southeastern Canada (this study), Oregon has wet, mild winters and relatively dry summers, and daily maximum temperatures are rarely below 0°C.…”

Section: Discussionmentioning

confidence: 99%

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Seasonal changes in temperature and light drive acclimation of photosynthetic physiology and macromolecular content in Lobaria pulmonaria

MacKenzie

MacDonald

Dubois

et al. 2001

Planta

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Lobaria pulmonaria (L.) Hoffm. is an epiphytic lichen common to temperate deciduous forests where it copes with large changes in temperature and light levels through repeated annual cycles. Samples of L. pulmonaria were taken from a deciduous forest in southeastern Canada at 35-day intervals from February 1999 to February 2000 and also from a rare population in an evergreen forest in March and August 1999. At field-ambient temperatures and light levels, the realised photosystem II (PSII) electron transport was low both in the summer and winter, with transient peaks in the spring and autumn. In contrast, the seasonal pattern of potential electron transport measured at a fixed 20 degrees C peaked in winter, showing the importance of temperature in driving photosynthesis to low levels in the winter despite an acclimation of electron-transport potential to exploit the high ambient light. Realised gross CO2 uptake was correlated with PSII electron transport at mechanistically plausible rates at all sampling sites in the summer but not in the winter, indicating electron diversion away from CO2 fixation in the winter. Chlorophyll content was highest in the dark summer months. The amount of ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO) large subunit (LSU) was highest in spring. Changes in the level of this hyperabundant protein and in the activity of PSII maintained a relatively constant rate of maximum CO2 uptake per RuBisCO LSU from April through November, despite great changes in the seasonal light and temperature. L. pulmonaria acclimates between light and temperature stress in the winter months to light-limitation in the dark summer months. Transition intervals in the spring and autumn, with warm, bright and wet conditions, are likely the most amenable times for growth.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Seasonal changes in temperature and light drive acclimation of photosynthetic physiology and macromolecular content in Lobaria pulmonaria

MacKenzie

MacDonald

Dubois

et al. 2001

Planta

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“…Growth rates are seasonal in L. pulmonaria; rapid in moist seasons and slow in dry ones (Muir and Shirazi 1997). Our transplantation started when the vegetation had fully developed foliage, causing a high evaporation.…”

Section: Discussionmentioning

confidence: 99%

“…The biomass growth of this species has been assessed in various areas (Denison 1988;McCune et al 1996;Renhorn et al 1997;Muir and Shirazi 1997;Sillett et al 2000;Palmqvist and Sundberg 2000;Antoine and McCune 2004;Gaio-Oliveira et al 2004). However, growth studies produce time-and location-specific results, meaning that generalizations can be premature without a deeper understanding of underlying factors.…”

Section: Introductionmentioning

confidence: 99%

Growth and ecophysiological acclimation of the foliose lichen Lobaria pulmonaria in forests with contrasting light climates

et al. 2005

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This study aims to assess biomass and area growth of 600 thalli of the old forest lichen, Lobaria pulmonaria, transplanted to three successional boreal forest stands with (1) natural rainfall regime, (2) additional moistening during dry days, and (3) additional moistening with added nutrients. Mean biomass growth during 100 days varied from 8.3% in the dark young spruce forest to 23.1% in the clear-cut area, with the old forest in between (16.0%). Additional moistening did not enhance lichen growth, probably because the transplantation period was wet. Nutrient additions slightly increased area growth compared to artificial water additions only. Growth was determined by a combination of external (forest stand, site factors) and internal factors (chlorophyll content, biomass per area). Transplants acclimated to high light by increasing thickness and chlorophyll a/b-ratio. Some visible bleaching and a strong positive correlation between chlorophyll content per area and lichen growth in clear-cuts suggest some high light-induced chlorophyll degradation. We believe that biomass growth and natural occurrence of L. pulmonaria is controlled by a delicate balance between light availability and desiccation risk, and that the species is confined to old forests due to a physiological trade-off between growth potential and fatal desiccation damage, both of which increase with increasing light. The discrepancy between potential and realized ecological niches is probably caused by a long-term risk to be killed in open habitats by high light during long periods with no rain.

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“…The cyanolichen community occupies a lower canopy position in the inland rainforest, and the bryophyte community that dominates lower branches on the coast is reduced or absent in the inland rainforest. These differences are likely due to the regional climate of the inland rainforest, which favors lichen growth in the summer (Coxson and Stevenson, 2007), instead of winter period (Muir et al, 1997). The mean annual precipitation in the wet and very wet subzones of the Interior Cedar-Hemlock Zone (Ketcheson et al, 1991) is 0.8-1.2 m (Reynolds, 1997), compared to 1.5-2.2 m in the Oregon Cascades (Sillett and McCune, 1998).…”

Section: Introductionmentioning

confidence: 99%

Influence of high-contrast and low-contrast forest edges on growth rates of Lobaria pulmonaria in the inland rainforest, British Columbia

Coxson

Stevenson

2007

Forest Ecology and Management

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Seasonal Growth Dynamics in the Lichen Lobaria pulmonaria

Cited by 52 publications

References 18 publications

Seasonal changes in temperature and light drive acclimation of photosynthetic physiology and macromolecular content in Lobaria pulmonaria

Seasonal changes in temperature and light drive acclimation of photosynthetic physiology and macromolecular content in Lobaria pulmonaria

Growth and ecophysiological acclimation of the foliose lichen Lobaria pulmonaria in forests with contrasting light climates

Influence of high-contrast and low-contrast forest edges on growth rates of Lobaria pulmonaria in the inland rainforest, British Columbia

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