Results 261 to 270 of about 220,261 (288)

Species turnover in deciduous forest vegetation

Vegetatio, 1978
Permanent quadrats were marked out in two areas of hardwood forest vegetation in 1969, and listings of their vascular plant species were taken on several occasions over the snow-free seasons of 1969, 1970, 1971 and 1976. Over the period of study, mean numbers of species per m2 remained virtually constant, but variations in the species compositions of ...
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Light-induced Mass Turnover in a Mono-species Community of Mixotrophs

Journal of Theoretical Biology, 2002
We formulate a simple model for growth of a facultative photoautotroph with chemoheterotrophic capabilities. The organism is described by zero, one or three reserve components, and one structural component, all taken to be generalized compounds.
Kooijman, S.A.L.M., Dijkstra, H.A., Kooi, B.W.   +2 more
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Species Turnover and Seedling Recruitment in Limestone Grasslands

Oikos, 1992
Species turnover and germination were analysed in the Veronica spicata-Avenula pratensis limestone grassland community. Species turnover was estimated on the basis of presence/absence of species in fifty 10×10 cm permanent plots during the period 1986 to 1989.
Graciela Rusch, Eddy van der Maarel
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Plant Traits and Species Turnover

1991
Density. Individuals of many species multiply their shoots every year. In the first period of their life shoots grow close to one another, and are as a rule tall and covered with a large number of leaves. Increased shoot densities, and the resultant shading of the polycormonal areas impede the production of renewal buds, and thereby restrict the ...
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Species turnover does not rescue biodiversity in fragmented landscapes

Nature
Habitat fragmentation generally reduces biodiversity at the patch scale (α diversity)1. However, there is ongoing debate about whether such negative effects can be alleviated at the landscape scale (γ diversity) if among-patch diversity (β diversity) increases as a result of fragmentation2-6. This controversial view has not been rigorously tested. Here
Thiago Gonçalves-Souza, Jonathan M. Chase, Nick M. Haddad, Maurício H. Vancine, Raphael K. Didham, Felipe L. P. Melo, Marcelo A. Aizen, Enrico Bernard, Adriano G. Chiarello, Deborah Faria, Heloise Gibb, Marcelo G. de Lima, Luiz F. S. Magnago, Eduardo Mariano-Neto, André A. Nogueira, André Nemésio, Marcelo Passamani, Bruno X. Pinho, Larissa Rocha-Santos, Rodolpho C. Rodrigues, Nathalia Vieira Hissa Safar, Bráulio A. Santos, Alejandra Soto-Werschitz, Marcelo Tabarelli, Marcio Uehara-Prado, Heraldo L. Vasconcelos, Simone Vieira, Nathan J. Sanders   +27 more
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Determining the Turnover of Glycosphingolipid Species by Stable-Isotope Tracer Lipidomics

Journal of Molecular Biology, 2016
In this study, we used water-soluble stable mass isotope precursors to measure the turnover of endogenous ceramide (Cer) and glycosphingolipids (GSLs) in HEp-2 cells. Cells incubated in the presence of [13C-U]glucose showed rapid incorporation of hexose residues with an increased mass of 6Da into GSLs.
Tore, Skotland, Kim, Ekroos, Simona, Kavaliauskiene, Jonas, Bergan, Dimple, Kauhanen, Tuulia, Lintonen, Kirsten, Sandvig   +6 more
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Turnover of Molecular Species of Sphingomyelin in Microsomes and Myelin of Rat Brain

Journal of Neurochemistry, 1980
Abstract:The metabolism of sphingomyelins containing short‐chain fatty acids (C18:sphingomyelin) and those containing long‐chain fatty acids (C24:sphingomyelin) in microsomes and myelin from rat brain were studied for periods from 1 to 60 days after intracisternal injection of [32P]Na2HPO4.
L, Freysz, P, Mandel
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The Expanding Scale of Species Turnover Events on Coral Reefs in Belize

Ecological Monographs, 2002
Beginning in the late 1980s, white-band disease nearly eliminated the stag- horn coral Acropora cervicornis from reefs in the central shelf lagoon of Belize. The lettuce coral Agaricia tenuifolia replaced Acropora cervicornis in the early 1990s, but anomalously high water temperatures in 1998 caused severe bleaching and catastrophic mortality of ...
Richard B. Aronson, Ian G. Macintyre, William F. Precht, Thaddeus J. T. Murdoch, Cheryl M. Wapnick   +4 more
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Turnover Rates of the Molecular Species of Ethanolamine Plasmalogen of Rat Brain

Journal of Neurochemistry, 1984
Abstract: 1,2‐Diradyl‐3‐acetylglycerols prepared from 1‐O‐alk‐l'‐enyl‐2‐acylglycero‐3‐phosphoethanolamine (alkenylacyl‐GPE, ethanolamine plasmalogen) and 1‐alkyl‐2‐acylglycero‐3‐phosphoethanolamine (alkylacyl‐GPE) of rat brain at 18 days of age were subfractionated into six species by AgNO3impregnated TLC. The percent compositions of subfractions were
Y, Masuzawa, T, Sugiura, Y, Ishima, K, Waku   +3 more
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Evolution: Morphological complexity fuels rapid species turnover

Current Biology
Some animal lineages, such as mammals or trilobites, show particularly high rates of evolution - that is, of species origination and extinction. What makes such lineages special is not clear. A new study shows that, in fossil ammonoid cephalopods, more complex shell ornaments are associated with higher evolutionary rates.
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