Influence of certain herbicides and a forest fertilizer on the nitrogen fixation by the lichen Peltigera praetextata.

abstract：:We examined the manner in which animals adjust the proportion of energy allocated to growth and storage in response to food availability. We compared univariate growth and length-mass relationships between juvenile adders (Vipera berus) reared under two different feeding regimes. Animals in the low- and high-food expe...

journal_title：Oecologia

authors： Forsman A,Lindell LE

更新日期：1996-12-01 00:00:00

abstract：:Fourteen temperate, submerged macrophytes were cultivated in the laboratory at high DIC levels (3.3-3.8 mM), 10.4-14.4 mol photons (PAR) m-2 d-1 and 15°C. Photosynthesis at photosaturation ranged between 0.59 and 17.98 mg O2 g-1 DW h-1 at ambient pH (8.3) and were markedly higher between 1.76 and 47.11 mg O2 g-1 DW h-...

journal_title：Oecologia

authors： Nielsen SL,Sand-Jensen K

更新日期：1989-11-01 00:00:00

abstract：:The effects of simulated goose grazing on Phleum pratense plants were tested in an Iceland hayfield during the spring goose staging period (19 April-11 May 1997). Plants in an area exclosed from the influence of grazing and the nutrient effects of goose faeces were subject to the removal of the youngest lamina once, t...

journal_title：Oecologia

authors： Fox AD,Kristiansen JN,Stroud DA,Boyd H

更新日期：1998-08-01 00:00:00

abstract：:Ant metapleural glands secrete surface antibiotics that affect pollen as well as bacteria and fungi. This may be one reason why ant pollination is rare. It is predicted that pollination by ants is possible only in the presence of certain ant and/or plant traits. Two traits are investigated; first, absence of the metap...

journal_title：Oecologia

authors： Peakall R,Angus CJ,Beattie AJ

更新日期：1990-10-01 00:00:00

abstract：:Many native communities contain exotic plants that pose a major threat to indigenous vegetation and ecosystem functioning. Therefore the enemy release hypothesis (ERH) and biotic resistance hypothesis (BRH) were examined in relation to the invasiveness of the introduced dune grass Ammophila arenaria in South Africa. T...

journal_title：Oecologia

authors： Knevel IC,Lans T,Menting FB,Hertling UM,van der Putten WH

更新日期：2004-11-01 00:00:00

abstract：:Aboveground herbivory is well known to change plant growth and defence. In contrast, effects of soil organisms, acting alone or in concert, on allocation patterns are less well understood. We investigated separate and combined effects of the endogeic earthworm species Aporrectodea caliginosa and the root feeding nemat...

journal_title：Oecologia

authors： Lohmann M,Scheu S,Müller C

更新日期：2009-05-01 00:00:00

abstract：:While the ecological consequences of roads are well described, little is known of their role as agents of natural selection, which can shape adaptive and maladaptive responses in populations influenced by roads. This knowledge gap persists despite a growing appreciation for the influence of evolution in human-altered ...

journal_title：Oecologia

authors： Brady SP

更新日期：2017-08-01 00:00:00

abstract：:In order to determine the influence of the hydrogen-ion concentration on the damage exerted to lichens by sulfur dioxide gas, thalli of the species Hypogymnia physodes and Xanthoria parietina were submerged in buffer solutions of pH 2 to pH 8 and subsequently exposed to SO2 gas. Net photosynthesis was employed as a cr...

journal_title：Oecologia

authors： Türk R,Wirth V

更新日期：1975-12-01 00:00:00

abstract：:Terpenoid emissions from ponderosa pine (Pinus ponderosa subsp. scopulorum) were measured in Colorado, USA over two growing seasons to evaluate the role of incident light, needle temperature, and stomatal conductance in controlling emissions of 2-methyl-3-buten-2-ol (MBO) and several monoterpenes. MBO was the dominant...

journal_title：Oecologia

authors： Harley P,Eller A,Guenther A,Monson RK

更新日期：2014-09-01 00:00:00

abstract：:The daily course of net photosynthesis and transpiration was measured with temperature and humidity controlled cuvettes at the end of the dry summer season in the Negev Desert. Species studied included: dominant species of the natural vegetation, cultivated plants in the run-off farm Avdat and permanently irrigated pl...

journal_title：Oecologia

authors： Schulze ED,Lange OL,Koch W

更新日期：1972-12-01 00:00:00

abstract：:The field thermal biology of sympatric Anolis cooki and A. cristatellus were evaluated in January and in August in desert scrub forest at Playa de Tamarindo near Guanica, Puerto Rico. Data on randomly positioned copper models of lizards, each equipped with a built-in thermocouple, established null hypotheses about bas...

journal_title：Oecologia

authors： Hertz PE

更新日期：1992-04-01 00:00:00

abstract：:Seed predation in relation to patterns of pod (and seed) distribution was examined in five samples of the common milkweed (Asclepias syriaca L.), in tests of the "resource-concentration" effect both within- and beween-plants. The proportion of pods in a cluster that were attacked, particularly by the weevil Rhyssomatu...

journal_title：Oecologia

authors： Franson SE,Willson MF

更新日期：1983-09-01 00:00:00

abstract：:Morphological relationships change with overall body size and body size often varies among populations. Therefore, quantitative analyses of individual traits from organisms in different populations or environments (e.g., in studies of phenotypic plasticity) often adjust for differences in body size to isolate changes ...

journal_title：Oecologia

authors： McCoy MW,Bolker BM,Osenberg CW,Miner BG,Vonesh JR

更新日期：2006-07-01 00:00:00

abstract：:We demonstrate that an egg parasitoid, Anagrus delicatus (Mymaridae, Hymenoptera) and its host, Prokelesia marginata (Delphacidae, Homoptera) regularly disperse 1 km or more in a north Florida saltmarsh. Anagrus delicatus were caught on yellow sticky traps on offshore islets and oyster bars throughout the spring, summ...

journal_title：Oecologia

authors： Antolin MF,Strong DR

更新日期：1987-09-01 00:00:00

abstract：:At constant cladode temperature the stomatal resistance of O. inermis increased when the cladode-air vapor pressure difference was increased and stomatal resistance decreased when the cladode-air vapor pressure difference was lowered. Net CO2 fixation in the dark was very responsive to these humidity dependent changes...

journal_title：Oecologia

authors： Osmond CB,Ludlow MM,Davis R,Cowan IR,Powles SB,Winter K

更新日期：1979-07-01 00:00:00

abstract：:Fluxes of CO2 and N2O were measured from both natural and experimentally augmented snowpacks during the winters of 1993 and 1994 on Niwot Ridge in the Colorado Front Range. Consistent snow cover insulated the soil surface from extreme air temperatures and allowed heterotrophic activity to continue through much of the ...

journal_title：Oecologia

authors： Brooks PD,Schmidt SK,Williams MW

更新日期：1997-04-01 00:00:00

abstract：:Nitrogen use efficiency (NUE) has been widely used to study the relationship between nitrogen uptake and dry mass production in the plant. As a subsystem of plant nitrogen use efficiency (NUE), I have defined leaf-level NUE as the surplus production (gross production minus leaf respiration) per unit amount of nitrogen...

journal_title：Oecologia

authors： Hirose T

更新日期：2012-07-01 00:00:00

abstract：:Six early successional plant species with differing photosynthetic pathways (3 C3 species and 3 C4 species) were grown at either 300, 600, or 1,200 ppm CO2 and at either 0.0 or 0.25 ppm SO2. Total plant growth increased with CO2 concentration for the C3 species and varied only slightly with CO2 for the C4 species. Fum...

journal_title：Oecologia

authors： Carlson RW,Bazzaz FA

更新日期：1982-01-01 00:00:00

abstract：:We examined the relationship between size variability and the distribution of functional gender in stands of the monoecious, wind-pollinated annual Ambrosia artemisiifolia. Populations of 60 individuals were grown in the greenhouse at a density of 372 m-2 and at two nutrient levels. Among the surviving plants, after s...

journal_title：Oecologia

authors： Ackerly DD,Jasieński M

更新日期：1990-04-01 00:00:00

abstract：:Effects of habitat fragmentation on species diversity and herbivore-parasitoid interactions were analyzed using the insect community of seed feeders and their parasitoids in the pods of the bush vetch (Vicia sepium L.). Field studies were carried out on 18 old meadows differing in area and isolation. The area of these...

journal_title：Oecologia

authors： Kruess A,Tscharntke T

更新日期：2000-01-01 00:00:00

abstract：:Species of the 'bana' vegetation in the Amazonas region of equatorial South America have scleromorphic leaves. This leaf type, which characterizes the vegetation of Mediterranean climates, among others, has apparently evolved in this community in response to the oligotrophic soils and widely fluctuating water table.An...

journal_title：Oecologia

authors： Sobrado MA,Medina E

更新日期：1980-01-01 00:00:00

abstract：:The paper considers a model of competition, based upon the Lotka-Volterra equations, which explicitly considers the effect of density independent mortality upon the outcome of competition. The model's possible application to wild Drosophila species in Europe are considered. ...

journal_title：Oecologia

authors： Shorrocks B,Begon M

更新日期：1975-12-01 00:00:00

abstract：:The importance of positive interspecific interactions within physically stressful habitats has received increased attention from community ecologists. The exposed sandy beach is an example of a physically rigorous environment where biological interactions have long been considered insignificant. We examined the intera...

journal_title：Oecologia

authors： Manning LM,Lindquist N

更新日期：2003-02-01 00:00:00

abstract：:The model of Meats (1974a) is tested against Laughlin's (1967a) data on growth in the field. A good measure of agreement is found. The model is then used to investigate the consequences of the univoltine T. paludosa starting its life cycle (flight season) at various dates in the range quoted by Coulson (1962)-i.e. fro...

journal_title：Oecologia

authors： Meats A

更新日期：1975-06-01 00:00:00

abstract：:The production of offspring by vertebrates is often timed to coincide with the annual peak in resource availability. However, capital breeders can extend the energetic benefits of a resource pulse by storing food or fat, thus relaxing the need for synchrony between energy supply and demand. Food-hoarding red squirrels...

journal_title：Oecologia

authors： Williams CT,Lane JE,Humphries MM,McAdam AG,Boutin S

更新日期：2014-03-01 00:00:00

abstract：:Climate change effects on plants are expected to be primarily mediated through early life stage transitions. Snowfall variability, in particular, may have profound impacts on seedling recruitment, structuring plant populations and communities, especially in mid-latitude systems. These water-limited and frequently inva...

journal_title：Oecologia

authors： Gornish ES,Aanderud ZT,Sheley RL,Rinella MJ,Svejcar T,Englund SD,James JJ

更新日期：2015-02-01 00:00:00

abstract：:We examined the effects of pollen source and resource availability on ovule abortion in the annual legumeCassia fasciculata. Pollen source was controlled by hand-pollinating flowers with cross- or self-pollen. Resource availability to developing fruits was controlled by adjusting fruit loads (heavy versus light) on ea...

journal_title：Oecologia

authors： Martin ME,Lee TD

更新日期：1993-07-01 00:00:00

abstract：:The effects of floral morphology on rates of pollen removal and deposition by different pollinators in generalist plant species are not well known. We studied pollination dynamics in wild radish, Raphanus raphanistrum, a plant visited by four groups of pollinators: honey bees, small native bees, butterflies, and syrph...

journal_title：Oecologia

authors： Conner JK,Davis R,Rush S

更新日期：1995-10-01 00:00:00

abstract：:We examined patterns of density and species diversity for leaf-mining Lepidopterans and gall-forming Hymenopterans in two oak (Quercus spp.) hybrid zones: Quercus depressipes x Q. rugosa and Q. emoryi x Q. coccolobifolia. In both species complexes, hybrid hosts typically supported significantly lower densities and spe...

journal_title：Oecologia

authors： Boecklen WJ,Spellenberg R

更新日期：1990-11-01 00:00:00

abstract：:We used field and mesocosm experiments to measure effects of southern redbelly dace (Phoxinus erythrogaster), a grazing minnow, on stream ecosystem structure and function. Ecosystem structure was quantified as algal filament length, algal biomass, size distribution of particulate organic matter (POM), algal assemblage...

journal_title：Oecologia

authors： Bertrand KN,Gido KB

更新日期：2007-02-01 00:00:00