An inventory of 13C abundances in coastal wetlands of Louisiana, USA: vegetation and sediments.

abstract：: Black and white spruce (Picea mariana and P. glauca) exhibit a striking micro-geographic distribution pattern at the southern edge of the boreal forest. Black spruce grows in flooded nutrient-poor muskegs, while white spruce is found primarily on drier upland sites, and the two rarely form mixed stands. In an attempt...

journal_title：Oecologia

authors： Patterson TB,Guy RD,Dang QL

更新日期：1997-04-01 00:00:00

abstract：:Theoretical models about the benefits of philopatry predict that immigrant fitness can be higher, lower or similar to that of philopatrics depending on habitat heterogeneity, dispersal costs, distance between patches or population densities. In this study, we compared transience rates, local survival and recruitment a...

journal_title：Oecologia

authors： Oro D,Tavecchia G,Genovart M

更新日期：2011-04-01 00:00:00

abstract：:Leptopterna dolobrata (L.) (Holarctis) and Calocoris roseomaculatus (De Geer) (Palaearctis) are single-brooded in the whole range of their distribution and hibernate in the egg stage. Both species are active only for 21/2 months, while the egg stage lasts over 9 months.The main food plants of Leptopterna are Dactylis ...

journal_title：Oecologia

authors： Braune HJ

更新日期：1971-09-01 00:00:00

abstract：:Since the publication of the theory of island biogeography, ecologists have postulated that fragmentation of continuous habitat presents a prominent threat to species diversity. However, negative fragmentation effects may be artifacts; the result of species diversity declining with habitat loss, and habitat loss corre...

journal_title：Oecologia

authors： MacDonald ZG,Anderson ID,Acorn JH,Nielsen SE

更新日期：2018-01-01 00:00:00

abstract：:The rates at which bumblebees of different proboscis lengths forage on flowers of a series of corolla tube lengths were determined. The results indicate significant correlations between proboscis length and time spent by bees on flowers. Bumblebees of long proboscis length can forage significantly faster than bees of ...

journal_title：Oecologia

authors： Inouye DW

更新日期：1980-05-01 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：:I examined the effects of pollen loads containing pollen from one, three and five donors on fruit production and fruit quality in Campsis radicans. Number of pollen donors had no significant effect on % fruit production, seed number, seed weight or seed germination. In singledonor pollinations the identity of the dono...

journal_title：Oecologia

authors： Bertin RI

更新日期：1986-08-01 00:00:00

abstract：:The spatial context in which seed predation occurs may modify the spatial structure of recruitment generated by seed dispersal. The Janzen-Connell (J-C) model predicts that granivores will exert greater pressure on the parent plant or at those sites where the density of dispersed seeds is higher. We have investigated ...

journal_title：Oecologia

authors： Blendinger PG,Díaz-Vélez MC

更新日期：2010-06-01 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：:Kinetic properties of NAD malate dehydrogenase (MDH) and glutamate oxaloacetate transaminase (GOT) were analyzed in two genotypes of Arabidopsis thaliana collected in two sites of contrasting climates. Plants from each genotype were acclimated under controlled conditions at four different thermoperiods: 5-10° C, 7-15°...

journal_title：Oecologia

authors： Simon JP,Potvin C,Blanchard MH

更新日期：1983-11-01 00:00:00

abstract：:Proteolytic activity in the gut contents of two cichlids and six cyprinids from an artificial basin in Sri Lanka was measured using a simple film strip method. This comparative study contributes to our general knowledge of digestion in herbivorous fish: 1) Specific proteolytic activity (per ml of gut content) is lower...

journal_title：Oecologia

authors： Hofer R,Schiemer F

更新日期：1981-03-01 00:00:00

abstract：:Pollen movement is often restricted in natural populations, and insufficient pollination is a potential constraint on sexual reproduction in outcrossing species. Seed-set should decrease with increased distance from the pollen source in outcrossing plants. This prediction was tested using females of the clonal, gynodi...

journal_title：Oecologia

authors： Widén B,Widén M

更新日期：1990-06-01 00:00:00

abstract：:As an extension of earlier investigations, the mating calls ofHyla arborea kretensis, Hyla a. molleri, andHyla a. sarda were studied, and variations in the calls with air temperature were determined. The mating calls of these species exhibit the typical structure, made up of short pulses of varying amplitude. The call...

journal_title：Oecologia

authors： Schneider H

更新日期：1974-03-01 00:00:00

abstract：:We report the recovery of root nodules from P. glandulosa var. glandulosa in the eastern portion of its range, where the species reaches its greatest vegetational development. Single cores 4.7 cm in diameter and up to 250 cm deep yielded from 0 to over 250 nodules. Nodules were found at all depths below 10 cm, with th...

journal_title：Oecologia

authors： Johnson HB,Mayeux HS Jr

更新日期：1990-09-01 00:00:00

abstract：:The possibility that resource limits constrain the growth of mobile epifaunal populations associated withSargassum patens plants was investigated by placing plants and associated animals into field microcosms which excluded fish predators, and then comparing faunal abundance and size-structure changes in different mic...

journal_title：Oecologia

authors： Edgar GJ,Aoki M

更新日期：1993-03-01 00:00:00

abstract：:Understanding how habitat selection changes with population density is a key concept in population regulation, community composition and managing impacts on biodiversity and ecosystem services. At low density, it is expected that individuals select habitats in terms of their preference, but as population density incre...

journal_title：Oecologia

authors： Pérez-Barbería FJ,Hooper RJ,Gordon IJ

更新日期：2013-11-01 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：:While morphological differences such as tongue length are often featured as drivers of pollinator floral preferences, differences in chemical detection and tolerance to secondary compounds may also play a role. We sought to better understand the role of secondary compounds in floral preference by examining visitation ...

journal_title：Oecologia

authors： Villalona E,Ezray BD,Laveaga E,Agrawal AA,Ali JG,Hines HM

更新日期：2020-07-01 00:00:00

abstract：:In this review I offer a solution to the problem why endotherm populations appear to be so inefficient in converting food energy into body substance despite the fact that individual endotherms are just as 'efficient' in this respect as individual ectotherms. Calculated for individuals of half the adult mass both ectot...

journal_title：Oecologia

authors： Wieser W

更新日期：1985-07-01 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：:Seven North American moss species responded differentially to fumigations with sulfur dioxide ranging from 0.5 to 4.0 ppm. Leucobryum glaucum and Dicranum scoparium were the most sensitive species; Dicranella heterophylla, Polytrichum ohioense and Pottia truncata, the most resistant. The results of fumigations with 0....

journal_title：Oecologia

authors： Nash TH 3rd,Nash EH

更新日期：1974-09-01 00:00:00

abstract：:In highly dynamic and unpredictable environments such as the Southern Ocean, species that have evolved behaviors that reduce the effects of intra-specific competition may have a selective advantage. This is particularly true when juveniles face disadvantages when foraging due to morphological or physiological limitati...

journal_title：Oecologia

authors： Field IC,Bradshaw CJ,Burton HR,Sumner MD,Hindell MA

更新日期：2005-01-01 00:00:00

abstract：:During the winter in greenhouse culture, Frerea indica(Asclepiadaceae) is a leafless stem succulent resembling the other members of the Stapelieae subfamily. However, in spring it produces leaves which persist during the summer period. CO2 exchange measurements were carried out with Frerea indica at its different seas...

journal_title：Oecologia

authors： Lange OL,Zuber M

更新日期：1977-01-01 00:00:00

abstract：:To investigate the physiological, behavioral, and genetic contributions to growth rate, we studied the thermal sensitivity of growth rate in hatchlings of the iguanid lizards Sceloporus occidentalis and S. graciosus in the laboratory. We used a cycling thermal regime patterned after thermal environments found in natur...

journal_title：Oecologia

authors： Sinervo B,Adolph SC

更新日期：1989-03-01 00:00:00

abstract：:Both spatial processes and environmental control may structure metacommunities, but their relative importance may be contingent on the dispersal ability of organisms. I examined the roles of spatial and environmental factors for the structuring of littoral macroinvertebrate communities across a set of lakes in a borea...

journal_title：Oecologia

authors： Heino J

更新日期：2013-04-01 00:00:00

abstract：:Biotic assemblages of insular habitats are nested when poor assemblages are subsets of richer ones. Nestedness of species assemblages is frequent and may result from selective extinction or frequent colonization in insular habitats. It may also be created by a nested distribution of habitats among islands or by sampli...

journal_title：Oecologia

authors： Calmé S,Desrochers A

更新日期：1999-03-01 00:00:00

abstract：:Florivores are present in many pollination systems and can have direct and indirect effects on both plants and pollinators. Although the impact of florivores are commonly examined in facultative pollination mutualisms, their effects on obligate mutualism remain relatively unstudied. Here, we used experimental manipula...

journal_title：Oecologia

authors： Althoff DM,Xiao W,Sumoski S,Segraves KA

更新日期：2013-12-01 00:00:00

abstract：:We used Y-plant, a computer-based model of crown architecture, to examine the implications of leaf reorientation resulting from petiole bending in Psychotria limonensis (Rubiaceae) seedlings. During this reorientation process, bending of the petioles of lower leaves that are potentially self-shaded by the upper leaves...

journal_title：Oecologia

authors： Gálvez D,Pearcy RW

更新日期：2003-03-01 00:00:00

abstract：:In the present study we investigated the economics of load transport in the grass-cutting ant Atta vollenweideri by focusing on the effects of load mass, width and length on individual transport rates. Both running speed of foragers and the amount of material transported a given distance per unit time, i.e. gross mate...

journal_title：Oecologia

authors： Röschard J,Roces F

更新日期：2002-04-01 00:00:00

abstract：:Reproduction is an important life history trait that strongly affects dynamics of plant populations. Although it has been well documented that elevated carbon dioxide (CO2) in the atmosphere greatly enhances biomass production in plants, the overall effect of elevated CO2 on reproductive allocation (RA), i.e., the pro...

journal_title：Oecologia

authors： Wang X,Taub DR,Jablonski LM

更新日期：2015-04-01 00:00:00