Leaf Life-Span and Leafing Phenology of Lianes and Associated Trees During a Rainforest Succession

Hegarty, Elwyn E.

doi:10.2307/2261113

Cited by 53 publications

(45 citation statements)

References 24 publications

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“…It is not known whether this relative constancy of carbon isotope ratio is maintained throughout the year. Compared to trees, vines tend to allocate more biomass to photosynthetic tissues than to supporting structures (Castellanos 1991) and, in general, leaf production and turnover rates are greater in vines than in trees (Hegarty 1990). As a consequence, one might expect the δ 13 C of vine leaves to respond more rapidly to changing environmental conditions.…”

mentioning

confidence: 99%

Carbon isotope composition of canopy leaves in a tropical forest in Panama throughout a seasonal cycle

Holtum

Winter

2005

Trees

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The seasonal variation in δ 13 C values was measured in leaves from 17 upper canopy, five mid-canopy and in four gap tree species, as well as in five epiphyte and five vine species, in a seasonally dry lowland tropical forest at Parque Natural Metropolitano near Panama City, Republic of Panama. No seasonal variation was detected in the δ 13 C values of mature exposed leaves from either the upper or mid-canopy. However, canopy position did influence the δ 13 C value. The mean isotopic composition of leaves from the mid-canopy was more negative than that of the upper canopy throughout the year. The δ 13 C value was also influenced by leaf development, with juvenile leaves on average 1.5‰ less negative than mature leaves. The five epiphyte species exhibited δ 13 C values that were typical of crassulacean acid metabolism (CAM). Codonanthe uleana, with isotopic values of −19.9 to −22.1‰, is only the second species in the Gesneriaceae reported to express CAM, whereas values between −14.6 and −22.0‰ indicate that Peperomia macrostachya can exhibit different degrees of CAM. The isotopic composition of exposed mature leaves from the vines showed little interspecific variation and was similar to the upper-canopy leaves of the trees.

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confidence: 99%

Carbon isotope composition of canopy leaves in a tropical forest in Panama throughout a seasonal cycle

Holtum

Winter

2005

Trees

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“…1985;Specht 1986;Hegarty 1990). These boundary layer ISSN 2157-6092 2014 www.macrothink.org/jee 194 temperatures can be determined (1) in the gradient from the temperate to the tropical regions (Specht 1981f) and (2) in the air entrapped between leaves of various density of packing on dicotyledonous shoot or in monocotyledonous clumps (Specht & Yates 1990;).…”

Section: Training Of Community-physiologistsmentioning

confidence: 99%

“…The first half of this book deals with the description of Australian ecosystems (Specht et al 1974, their biogeography since the Late Cretaceous, and Aboriginal impact on these ecosystems -based on long-term studies (up to 50 years duration), such as: -Subtropical rainforest (Hegarty 1990;Lamb 1980;Doley et al 1987;Stewart et al 1990;Specht A. 1988;Specht 2007).…”

Section: Journal Of Environment and Ecologymentioning

confidence: 99%

Management of Biodiversity in Australia

Specht

2014

JEE

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The concept of holistic ecosystem research, termed community-physiology, has gradually developed over the last 150 years. The discipline of community-physiology investigates the physico-chemical processes that determine the structure, growth and biodiversity of plant communities (with associated consumers and decomposers), both above and below ground, in space and time, from the tropical north to the tempera te south of Australia. These physico-chemical processes (aerodynamic fluxes -frictional, thermal, evaporative ± atmospheric salinity -plus available soil water and soil nutrients) need to be clearly enunciated and integrated in 'ecosystem models' in order to predict the effect of perturbations (such as Global Warming, nutrient pollution, invasive biota, fire, overgrazing, etc.) on Australian ecosystems. An increase in global temperatures of 2 o C is predicted to affect the development of the foliage covers of overstorey and understorey strata resulting in open-forests -> woodlands -> open-woodlands -> tall shrublands -> low shrublands throughout Australia.In order to conserve Australian biota for posterity, community-physiologists, ecosystem modelers and environmental impact ecologists must have a deep understanding of the eco-physiology of producers, consumers and decomposers that compose an ecosystem and how these organisms interact with the continually-changing physico-chemical processes in the atmosphere and soil, in space and time.

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“…Today, foliage shoot growth of the overstorey trees in subtropical eucalypt open-forests and rainforests occurs during springtime-the driest time of the year in southeastern Queensland-and again in autumn at a reduced rate of production [101][102][103][104][105][106][107][108]. Flower production follows the shoot growth phenology in subtropical eucalypt open-forests [83].…”

Section: Seasonal Phenologymentioning

confidence: 99%

Biodiversity of Terrestrial Ecosystems in Tropical to Temperate Australia

Specht

2012

International Journal of Ecology

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During the short period of annual foliage growth in evergreen plant communities, aerodynamic fluxes (frictional, thermal, evaporative) in the atmosphere as it flows over and through a plant community determine the Foliage Projective Covers and leaf attributes in overstorey and understorey strata. The number of leaves produced on each vertical foliage shoot depends on available soil water and nutrients during this growth period. The area of all leaves exposed to solar radiation determines net photosynthetic fixation of the plant community throughout the year. In turn, the species richness (number of species per hectare) of both plants and resident vertebrates is determined. The species richness of unicellular algae and small multicellular isopods in permanent freshwater lagoons in Northern Australia may possibly have been increased by radiation released from nearby uranium deposits. Evolution of new angiosperms probably occurred in refugia during periods of extreme drought. When favourable climates were restored, the vegetation expanded to result in high Gamma Biodiversity (number of plant species per region) but with each major plant community having essentially the same species richness (number of plant species per hectare). The probable effects of pollution and Global Warming on biodiversity in Australian ecosystems, that experience seasonal drought, are discussed.

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Leaf Life-Span and Leafing Phenology of Lianes and Associated Trees During a Rainforest Succession

Cited by 53 publications

References 24 publications

Carbon isotope composition of canopy leaves in a tropical forest in Panama throughout a seasonal cycle

Carbon isotope composition of canopy leaves in a tropical forest in Panama throughout a seasonal cycle

Management of Biodiversity in Australia

Biodiversity of Terrestrial Ecosystems in Tropical to Temperate Australia

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