Variable carbon isotope ratios of Dudleya species growing in natural environments.

abstract：:To examine the importance of Na+ and Cl- to osmotic adjustment in a salt-tolerant ecotype of the C4 nonhalophyte Andropogon glomeratus, plants were watered with sorbitol, a neutral osmoticum, and synthetic seawater, for five days. Gas exchange measurements were made during the course of the watering treatment and duri...

journal_title：Oecologia

authors： Bowman WD

更新日期：1988-11-01 00:00:00

abstract：:Studies of nitrogen (N) cycling have traditionally focused on N mineralization as the primary process limiting plant assimilation of N. Recent evidence has shown that plants may assimilate amino acids (AAs) directly, circumventing the mineralization pathway. However, the general abundance of soil AAs and their relativ...

journal_title：Oecologia

authors： Hofmockel KS,Fierer N,Colman BP,Jackson RB

更新日期：2010-08-01 00:00:00

abstract：:For unicellular organisms, a lack of effects of local species richness on ecosystem function has been proposed due to their locally high species richness and their ubiquitous distribution. High dispersal ability and high individual numbers may enable unicellular taxa to occur everywhere. Using our own and published da...

journal_title：Oecologia

authors： Hillebrand H,Watermann F,Karez R,Berninger UG

更新日期：2001-01-01 00:00:00

abstract：:Vein placement has been hypothesised to control leaf hydraulic properties, but the ecophysiological significance of variation in vein placement in the angiosperms has remained poorly understood. The highly diverse Neotropical Bromeliaceae offers an excellent system for exploring understudied relationships between leaf...

journal_title：Oecologia

authors： Males J

更新日期：2017-11-01 00:00:00

abstract：:Individual male and female Bufo woodhousei spent only two or three nights of the several week breeding season in the pond. In spite of the continual arriving and leaving of individuals the operational sex ratio (the number of females available to mate/number of males attempting to mate) varied little, either temporall...

journal_title：Oecologia

authors： Woodward BD

更新日期：1984-05-01 00:00:00

abstract：:The induction of diapause can be adaptive for egg survival during unfavorable conditions, while direct development can be advantageous under favorable conditions by allowing additional generations to exploit abundant resources. Therefore, the physiological capability of a female to respond to environmental cues indica...

journal_title：Oecologia

authors： Huestis DL,Marshall JL

更新日期：2006-01-01 00:00:00

abstract：:The partitioning of energy in three species of nematode, Paroigolaimella bernensis, Diplogasteritus nudicapitatus and Rhabditis curvicaudata, from a polysaprobic environment is considered. Temperature was shown to have a profound impact on the rate at which these organisms obtained food resources and on the partitioni...

journal_title：Oecologia

authors： Woombs M,Laybourn-Parry J

更新日期：1985-01-01 00:00:00

abstract：:For organisms with restricted mobility, density dependence may occur on spatial scales much smaller than that of the whole population. Averaging densities over whole populations in such organisms gives a more or less inaccurate description of the real variation in competitive intensity over time and space. The potenti...

journal_title：Oecologia

authors： Einum S,Nislow KH

更新日期：2005-03-01 00:00:00

abstract：:Asexual fungal endophytes, which do not produce reproductive structures, spread in host populations only vertically via the propagules of their hosts. With such a close relationship between the fitness of the asexual endophyte and that of the host, the relationship is traditionally thought to be mutualistic. Here we p...

journal_title：Oecologia

authors： Olejniczak P,Lembicz M

更新日期：2007-06-01 00:00:00

abstract：:Amazon forests along a toposequence at San Carlos de Rio Negro (Venezuela) show distinct nutrient limitations depending on slope position. Soils were collected by genetic horizons and analysed to provide information on the relationships between soil P and N status and the nutrition of natural forest at three locations...

journal_title：Oecologia

authors： Tiessen H,Chacon P,Cuevas E

更新日期：1994-09-01 00:00:00

abstract：:The stress-gradient hypothesis (SGH) predicts that the community-wide prevalence of positive interactions, relative to negative interactions, is greater under more severe environmental conditions. Because the frequency of positive and negative interactions within a community is the aggregate of multiple pair-wise inte...

journal_title：Oecologia

authors： le Roux PC,McGeoch MA

更新日期：2010-03-01 00:00:00

abstract：:Intraspecific variation in behavior and diet can have important consequences for population and ecosystem dynamics. Here, we examine how differences in reproductive investment and spatial ecology influence individual diet specialization in male and female southern sea otters (Enhydra lutris nereis). We hypothesize tha...

journal_title：Oecologia

authors： Smith EA,Newsome SD,Estes JA,Tinker MT

更新日期：2015-05-01 00:00:00

abstract：:The duration times of the eggs, nauplii and copepodites of Cyclops vicinus and Eudiaptomus gracilis were obtained, by experiment, at 5, 10, 15 and 20°C. In contrast with previously published work on copepod development, the ovigerous females, used in the cultures at these temperatures, were removed from a water storag...

journal_title：Oecologia

authors： Munro IG

更新日期：1974-12-01 00:00:00

abstract：:Canopy structure and tree species diversity, shaped by succession, disturbance, and community composition, are linked to numerous ecosystem functions, including net primary production (NPP). Understanding of how ecosystem structural metrics are interrelated and mechanistically link to NPP, however, is incomplete. We c...

journal_title：Oecologia

authors： Scheuermann CM,Nave LE,Fahey RT,Nadelhoffer KJ,Gough CM

更新日期：2018-10-01 00:00:00

abstract：:According to the plant vigour hypothesis, galling insects should respond positively and perform better on vigorous plants or plant parts, the opposite of the predictions of the plant stress hypothesis. I carried out field experiments to analyse the effects of sustained abiotic stress on the interactions between the co...

journal_title：Oecologia

authors： De Bruyn L

更新日期：1995-04-01 00:00:00

abstract：:The frequency of extreme warm years is increasing across the majority of the planet. Shifts in plant phenology in response to extreme years can influence plant survival, productivity, and synchrony with pollinators/herbivores. Despite extensive work on plant phenological responses to climate change, little is known ab...

journal_title：Oecologia

authors： Carter JM,Orive ME,Gerhart LM,Stern JH,Marchin RM,Nagel J,Ward JK

更新日期：2017-04-01 00:00:00

abstract：:In annual pastures utilized for grazing, the amount and quality of the standing dry matter in the dry season is of importance for the performance of the animals. Often both characteristics decline at the end of the green season. It is shown, that dispersal of the reproductive structures of the vegetation may be the ma...

journal_title：Oecologia

authors： de Ridder N,Seligman NG,van Keulen H

更新日期：1981-05-01 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：:Transplants of white clover (Trifolium repens L.) were grown isolated from each other and in pairs placed at different distances apart. The paired plants developed asymmetrically and at the interface between paired clones both the density of nodes and of stolons appeared to reach ceiling values that were of the same o...

journal_title：Oecologia

authors： Solangaarachchi SM,Harper JL

更新日期：1989-02-01 00:00:00

abstract：:The turnover of plant biomass largely determines the amount of energy flowing through an ecosystem and understanding the processes that regulate turnover has been of interest to ecologists for decades. Leaf life span theory has proven useful in explaining patterns of leaf turnover in relation to resource availability,...

journal_title：Oecologia

authors： Rodriguez GE,Reed DC,Holbrook SJ

更新日期：2016-10-01 00:00:00

abstract：:Blue oak (Quercus douglasii) is a deciduous tree species endemic to California that currently exhibits poor seedling survival to sapling age classes. We used common garden techniques to examine how genetic variation at regional and local scales affected phenotypic expression in traits affecting oak seedling growth and...

journal_title：Oecologia

authors： Rice KJ,Gordon DR,Hardison JL,Welker JM

更新日期：1993-12-01 00:00:00

abstract：:Mechanical aspects of predation by the shore crab, Carcinus maenas, on the edible mussel, Mytilus edulis, were examined. The shore crabs from the population studied utilized five distinct, largely size-related, mussel-opening techniques. Crushing the mussel umbone appeared the most successful opening method for medium...

journal_title：Oecologia

authors： Elner RW

更新日期：1978-01-01 00:00:00

abstract：:Breeding ecology and mating patterns of the western toad, Bufo boreas, were examined in three large explosively breeding populations in the Oregon Cascade Mountains. Two mating patterns occurred variably within and among the three populations. First, a large male mating advantage was observed in two of the three popul...

journal_title：Oecologia

authors： Olson DH,Blaustein AR,O'Hara RK

更新日期：1986-10-01 00:00:00

abstract：:We investigated in the field the carbon (C) transfer between sugar maple (Acer saccharum) saplings and the spring ephemeral Erythronium americanum via the mycelium of arbuscular mycorrhizal (AM) fungi. Sugar maple saplings and E. americanum plants were planted together in pots placed in the ground of a maple forest in...

journal_title：Oecologia

authors： Lerat S,Gauci R,Catford JG,Vierheilig H,Piché Y,Lapointe L

更新日期：2002-07-01 00:00:00

abstract：:Optimal diet theory often fails to predict a forager's diet choice when prey are mobile. Because they escape or defend themselves, mobile prey are likely to increase the forager's handling time, thereby decreasing its fitness gain rate. Many animals have been shown to select their prey so as to maximize either their f...

journal_title：Oecologia

authors： Barrette M,Wu GM,Brodeur J,Giraldeau LA,Boivin G

更新日期：2009-01-01 00:00:00

abstract：:Anthropogenic land use may shape vegetation composition and affect trophic interactions by altering concentrations of host plant metabolites. Here, we investigated the hypotheses that: (1) plant N and defensive secondary metabolite contents of the herb Plantago lanceolata are affected by land use intensity (LUI) and t...

journal_title：Oecologia

authors： Wäschke N,Hancock C,Hilker M,Obermaier E,Meiners T

更新日期：2015-09-01 00:00:00

abstract：:Net photosynthetic rates for the lichen Parmelia praesignis Nyl. were obtained as a function of 5 light levels, 5 temperature levels, and of water content as thalli dried from saturated conditions. Data are described as second order polynomials in the light, and as saturation curves in the dark. Rates in the light wer...

journal_title：Oecologia

authors： Link SO,Nash TH 3rd

更新日期：1984-10-01 00:00:00

abstract：:The evolution of longevity requires a low risk of mortality from extrinsic factors, relative to intrinsic factors, so that individuals that differentially invest in physiological self-maintenance and minimize their annual reproductive costs will maximize lifetime fitness through a prolonged reproductive lifespan. The ...

journal_title：Oecologia

authors： Apanius V,Nisbet IC

更新日期：2006-02-01 00:00:00

abstract：:Resistance of Pteridium aquilinum to insect attack was studied by incorporating air dried bracken leaf meal and extracts of bracken leaf meal into an artificial diet for Trichoplusia ni (Lepidoptera: Noctuidae). When larvae are reared on diets containing 6% bracken leaf meal, they do not mature past the second instar ...

journal_title：Oecologia

authors： Hendrix SD

更新日期：1977-12-01 00:00:00

abstract：:Although ontogenetic changes in the carbon isotope ratios of marine fauna have been well studied those of freshwater organisms have not. As a result, we may have a less than adequate assessment of the incorporation of allochthonous detritus into freshwater foodwebs. This study found a δ13C range of 9‰ for crayfish (Or...

journal_title：Oecologia

authors： France R

更新日期：1996-07-01 00:00:00