Prosopis glandulosa and the nitrogen balance of rangelands: extent and occurrence of nodulation.

abstract：:Gas exchange characteristics in leaves of the sclerophyll shrub Quercus coccifera were studied in the natural habitat in Portugal during spring and during the summer dry period. Compared to other sclerophyll species growing at the same site, photosynthesis in leaves of Quercus coccifera was less affected by water stre...

journal_title：Oecologia

authors： Tenhunen JD,Lange OL,Harley PC,Beyschlag W,Meyer A

更新日期：1985-08-01 00:00:00

abstract：:Inter-specific competition, facilitation and predation influence herbivore assemblages, but no study has experimentally explored the interactions between large ungulates and small rodents. In a fully replicated, landscape scale experiment, we manipulated densities of domestic sheep in mountain pastures in Norway. We t...

journal_title：Oecologia

authors： Steen H,Mysterud A,Austrheim G

更新日期：2005-04-01 00:00:00

abstract：:1. Aspects of colonization by freshwater invertebrates on artificial substrata (macrophyte models) placed in the benthos of a eutrophic lake were studied. 2. Colonization was rapid, with equilibrium occuring at about 35 days. The colonization rate curve decreased with time but extinction rate remained constant. 3. Pre...

journal_title：Oecologia

authors： Mason CF

更新日期：1978-01-01 00:00:00

abstract：:This paper reports on an asymmetric indirect interaction between two chrysomelid beetles where one species (Galerucella tenella) experiences higher parasitization, and the other species (Galerucella calmariensis) lower parasitization, in mixed compared with monospecific populations. This pattern is likely to be a cons...

journal_title：Oecologia

authors： Hambäck PA,Stenberg JA,Ericson L

更新日期：2006-06-01 00:00:00

abstract：:Determining how environmental conditions interact with individual intrinsic properties is important for unravelling the underlying mechanisms that drive variation in reproductive decisions among migratory species. We investigated the influence of sea ice conditions and body condition at arrival on the breeding propens...

journal_title：Oecologia

authors： Jean-Gagnon F,Legagneux P,Gilchrist G,Bélanger S,Love OP,Bêty J

更新日期：2018-01-01 00:00:00

abstract：:Growth and respiration were measured in a species of Anonchus (Nematoda: Plectidae) at 5°C, 10°C, 15°C, 20°C and 25°C. At 5°C no growth was measurable but the organisms remained active. Maximum production occurred at 15°C, but the highest rate of growth occurred at 20°C. Thus, adult size attained is dependent on the t...

journal_title：Oecologia

authors： Laybourn J

更新日期：1979-08-01 00:00:00

abstract：:Larger nymphs within aquatic insect taxa have been frequently observed to be transported down-stream in the stream drift only at night. Others have hypothesized this pattern results primarily from large nymphs' behavioural avoidance of entering drift during daylight, when size-selective, visually-feeding fish predator...

journal_title：Oecologia

authors： Poff NL,DeCino RD,Ward JV

更新日期：1991-12-01 00:00:00

abstract：:In this paper we test the influence of temperature and interference competition by dominant species on the foraging of subordinate species in Mediterranean ant communities. We have analyzed the changes in resource use by subordinate species in plots with different abundances of dominant ants, and in different periods ...

journal_title：Oecologia

authors： Cerdá X,Retana J,Manzaneda A

更新日期：1998-12-01 00:00:00

abstract：:Although consumers often rely on chemical information to optimize their foraging strategies, it is poorly understood how top carnivores above the third trophic level find resources in heterogeneous environments. Hyperparasitoids are a common group of organisms in the fourth trophic level that lay their eggs in or on t...

journal_title：Oecologia

authors： Cusumano A,Harvey JA,Dicke M,Poelman EH

更新日期：2019-03-01 00:00:00

abstract：:The relative importance of allelopathy and resource competition in plant-plant interactions has been vigorously debated but seldom tested. We used activated carbon to manipulate the effects of root exudates of Centaurea maculosa, a noxious weed in much of western North America, on root elongation rates and growth of t...

journal_title：Oecologia

authors： Ridenour WM,Callaway RM

更新日期：2001-02-01 00:00:00

abstract：:Invasive species are capable of altering ecosystems through the consumption of basal resources. However, quantifying the effects of invasive species in large ecosystems is challenging. Measuring changes in basal resources (i.e., phytoplankton) at an ecosystem scale is an important and potentially translatable response...

journal_title：Oecologia

authors： Tumolo BB,Flinn MB

更新日期：2017-10-01 00:00:00

abstract：:Understanding the factors that affect establishment success of new species in established communities requires the study of both the ability of new species to establish and community resistance. Spatial pattern of species within a community can affect plant performance by changing the outcome of inter-specific competi...

journal_title：Oecologia

authors： Thébault A,Stoll P,Buttler A

更新日期：2012-12-01 00:00:00

abstract：:As the impact of anthropogenic activities intensifies worldwide, an increasing proportion of landscape is converted to early successional stages every year. To understand and anticipate the global effects of the human footprint on wildlife, assessing short-term changes in animal populations in response to disturbance ...

journal_title：Oecologia

authors： Martineau J,Pothier D,Fortin D

更新日期：2016-07-01 00:00:00

abstract：:Research on winter energy management in small vertebrates has focused on the regulation of body mass (BM) within a framework of starvation-predation trade-off. Winter-acclimatized birds exhibit a seasonal increase in both BM and basal metabolic rate (BMR), although the patterns of co-variation between the two traits r...

journal_title：Oecologia

authors： Broggi J,Nilsson JF,Koivula K,Hohtola E,Nilsson JÅ

更新日期：2019-02-01 00:00:00

abstract：:Plant stigmas and bee pollinators are competitors for pollen. Pollen placed on a pollinator's body can be picked up by conspecific stigmas or it can be collected by the pollinator as food. Hypothetically, one solution is for pollen to be placed on 'safe sites' on the pollinator's body, sites where the pollinator canno...

journal_title：Oecologia

authors： Tong ZY,Huang SQ

更新日期：2018-01-01 00:00:00

abstract：:The family of orchids involves a number of critically endangered species. Understanding of drivers of their landscape distribution could provide a valuable insight into their decline. Our objectives were to develop models predicting distribution of selected orchid species-four co-occurring forest orchid species, Cepha...

journal_title：Oecologia

authors： Hemrová L,Kotilínek M,Konečná M,Paulič R,Jersáková J,Těšitelová T,Knappová J,Münzbergová Z

更新日期：2019-06-01 00:00:00

abstract：:The extent, frequency and causes of pollenlimited seed production were examined in partially selffertile populations of Blandfordia grandiflora for 2 years. Percentage seed set of open-pollinated plants (50-57%) did not differ within or between years, and was about 19% less than experimentally cross-pollinated plants ...

journal_title：Oecologia

authors： Ramsey M

更新日期：1995-07-01 00:00:00

abstract：:Generalist parasites may disproportionately use certain hosts because of different benefits associated with each host species. I measured the growth rate of the marine snail Trichotropis cancellata, a facultative kleptoparasite that can suspension feed and steal food, on different hosts to determine the relative nutri...

journal_title：Oecologia

authors： Iyengar EV

更新日期：2004-03-01 00:00:00

abstract：:Mating durations of copepods were found to differ significantly between fishless high-altitude waters and lowland lakes containing fish. In lowland species the whole mating process was completed within a few minutes, but it averaged over an hour in high-altitude species. Alpine copepods showed a prolonged post-copulat...

journal_title：Oecologia

authors： Jersabek CD,Luger MS,Schabetsberger R,Grill S,Strickler JR

更新日期：2007-09-01 00:00:00

abstract：:Isoprene emission from plants represents one of the principal biospheric controls over the oxidative capacity of the continental troposphere. In the study reported here, the seasonal pattern of isoprene emission, and its underlying determinants, were studied for aspen trees growing in the Rocky Mountains of Colorado. ...

journal_title：Oecologia

authors： Monson RK,Harley PC,Litvak ME,Wildermuth M,Guenther AB,Zimmerman PR,Fall R

更新日期：1994-09-01 00:00:00

abstract：:Empirical and modeling studies of the N cycle in temperate forests of eastern North America have focused on the mechanisms regulating the production of inorganic N, and assumed that only inorganic forms of N are available for plant growth. Recent isotope studies in field conditions suggest that amino acid capture is a...

journal_title：Oecologia

authors： Gallet-Budynek A,Brzostek E,Rodgers VL,Talbot JM,Hyzy S,Finzi AC

更新日期：2009-05-01 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 seasonal changes in plant community architecture and its importance to insect herbivores during the ruderal-early stages of an experimental secondary successional gradient are described. The dominant group of insect herbivores, the Auchenorrhyncha (Hemiptera: Homoptera) are considered together with their host plan...

journal_title：Oecologia

authors： Stinson CS,Brown VK

更新日期：1983-01-01 00:00:00

abstract：:The compensatory growth potential of a grazed fungal biomass was mathematically expressed as a function of patchiness in its distribution and demonstrated in an experiment using the fungivorous collembolan Onychiurus armatus and the soil fungi Verticillium bulbillosum and Penicillium spinulosum. The model addresses th...

journal_title：Oecologia

authors： Bengtsson G,Hedlund K,Rundgren S

更新日期：1993-03-01 00:00:00

abstract：:The species composition of vesicular-arbuscular mycorrhizal (VAM) fungal communities changed during secondary succession of abandoned fields based on a field to forest chronosequence. Twenty-five VAM fungal species were identified. Seven species were clearly early successional and five species were clearly late succes...

journal_title：Oecologia

authors： Johnson NC,Zak DR,Tilman D,Pfleger FL

更新日期：1991-05-01 00:00:00

abstract：:Alpine Trifolium species have high rates of symbiotic N2-fixation which may influence the abundance and growth of plant species growing near them. The potential for facilitative effects on plant abundance and growth in dry meadow alpine tundra of Niwot Ridge, Colo., characterized by low resource availability, was inve...

journal_title：Oecologia

authors： Thomas BD,Bowman WD

更新日期：1998-06-01 00:00:00

abstract：:External hyphae of vesicular-arbuscular mycorrhizal (VAM) fungi were quantified over a growing season in a reconstructed tallgrass prairie and an ungrazed cool-season pasture. In both sites, hyphal lengths increased throughout the growing season. Peak external hyphal lengths were 111 m cm-3 of soil in the prairie and ...

journal_title：Oecologia

authors： Miller RM,Jastrow JD,Reinhardt DR

更新日期：1995-07-01 00:00:00

abstract：:Gas exchange measurements of two arctic tundra plants, Dupontia fischeri and Carex aquatilis, and two alpine tundra species, Deschampsia caespitosa and Geum rossii, were conducted under a range of atmospheric and soil moisture stress conditions to determine if photosynthetic adaptations to water stress may play a role...

journal_title：Oecologia

authors： Johnson DA,Caldwell MM

更新日期：1975-06-01 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：:Nectar plant utilization by butterflies was compared with the abundance of flowering plants on some SW Swedish meadows. The transportation of pollen grains by individual butterflies was analysed using a scanning electron microscope.For the majority of plant species, butteflies were of minor importance as pollinators. ...

journal_title：Oecologia

authors： Jennersten O

更新日期：1984-07-01 00:00:00