Induced responses in three alkaloid-containing plant species.

abstract：:Forest destruction and disturbance can have long-term consequences for species diversity and ecosystem processes such as seed dispersal. Understanding these consequences is a crucial component of conserving vulnerable ecosystems. In the heavily fragmented and disturbed Kakamega Forest, western Kenya, we studied seed d...

journal_title：Oecologia

authors： Farwig N,Böhning-Gaese K,Bleher B

更新日期：2006-03-01 00:00:00

abstract：:Humans are rapidly altering thermal landscapes, so a central challenge to organismal ecologists is to better understand the thermal niches of ectotherms. However, there is much disagreement over how we should go about this. Some ecologists assume that a statistical model of abundance as a function of habitat temperatu...

journal_title：Oecologia

authors： Stoffels RJ,Richardson AJ,Vogel MT,Coates SP,Müller WJ

更新日期：2016-01-01 00:00:00

abstract：:The responses to drought of the solar tracking winter annualLupinus arizonicus (Wats.) were examined under field and laboratory growth regimes. Under drought conditions tracking movements were maintained until the plant reached the wilting point. The leaves and leaflets were observed to cup in response to decreases in...

journal_title：Oecologia

authors： Forseth I,Ehleringer JR

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：:1. The mortality of part of the Calathus melanocephalus (Linn.) population, which showed locomotory activity during autumn 1966 was studied in the following year. 2. Mortality occurs mainly during the winter; during the winter of 1966-1967 it was about 36-41% for normal males and females at Schiermonnikoog (Table 1). ...

journal_title：Oecologia

authors： Vlijm L,van Dijk TS,Wijmans SY

更新日期：1968-11-01 00:00:00

abstract：:The CO2 assimilation of primary foliage of red maple (Acer rubrum L.) and red oak (Quercus rubra L.), and of regrowth foliage produced in response to simulated insect defoliation, was measured throughout the season by infrared gas analysis: parallel measurements of leaf conductance were obtained by ventilated diffusio...

journal_title：Oecologia

authors： Heichel GH,Turner NC

更新日期：1983-03-01 00:00:00

abstract：:Understanding the impact of multiple stressors on ecosystems is of pronounced importance, particularly when one or more of those stressors is anthropogenic. Here we investigated the role of physical disturbance and increased nutrients on reefs dominated by the canopy-forming kelp Ecklonia radiata. We combined experime...

journal_title：Oecologia

authors： Carnell PE,Keough MJ

更新日期：2014-05-01 00:00:00

abstract：:Cottonwoods are dominant riparian trees of the western United States and are known for their propensity to hybridize. We compared the decomposition of leaf litter from two species (Populus angustifolia and P. fremontii) and their hybrids. Three patterns were found. First, in one terrestrial and two aquatic experiments...

journal_title：Oecologia

authors： Driebe EM,Whitham TG

更新日期：2000-04-01 00:00:00

abstract：:In cloud forest at Monteverde, Costa Rica, two common treelets (Palicourea lasiorrachis and Cephaelis elata, both Rubiaceae) depend simultaneously on one hummingbird population (Lampornis calolaema) for pollination. Both species are distylous and self-incompatible. In laboratory experiments, we examined possible effec...

journal_title：Oecologia

authors： Feinsinger P,Busby WH,Tiebout HM 3rd

更新日期：1988-08-01 00:00:00

abstract：:Ecosystem-wide effects of introduced brown trout (Salmo trutta L.) and native river galaxias (Galaxiaseldoni McDowall) were studied by analysing ecosystem production budgets for two adjacent tributaries of a grassland stream-system in the South Island of New Zealand. One tributary was inhabited by brown trout, the oth...

journal_title：Oecologia

authors： Huryn AD

更新日期：1998-06-01 00:00:00

abstract：:Most theoretical models for the evolution of temperature-dependent sex determination (TSD) rely upon differential fitness of male and female offspring incubated under different thermal regimes. However, there are few convincing data on this topic. We studied incubation effects in a lizard species (Bassiana duperreyi, ...

journal_title：Oecologia

authors： Elphick MJ,Shine R

更新日期：1999-03-01 00:00:00

abstract：:Pathogens can drive host population dynamics. Chytridiomycosis is a fungal disease of amphibians that is caused by the fungus Batrachochytrium dendrobatidis (Bd). This pathogen has caused declines and extinctions in some host species whereas other host species coexist with Bd without suffering declines. In the early 1...

journal_title：Oecologia

authors： Sapsford SJ,Voordouw MJ,Alford RA,Schwarzkopf L

更新日期：2015-12-01 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

abstract：:Relationships between fine root growth, rates of litter decomposition and nutrient release were analysed in a mixed forest on Tierra Firme, a Tall Amazon Caatinga and a Low Bana on podsolized sands near San Carlos de Rio Negro. Fine root growth in the upper soil layers (root mat+10 cm upper soil) was considerably high...

journal_title：Oecologia

authors： Cuevas E,Medina E

更新日期：1988-07-01 00:00:00

abstract：:Restoration of degraded landscapes through replantings of native vegetation has been proceeding in response to habitat loss and fragmentation and plummeting biodiversity. Little is known about whether the investments in ecological restoration have resulted in biodiversity benefits. We evaluated the potential of restor...

journal_title：Oecologia

authors： Selwood K,Mac Nally R,Thomson JR

更新日期：2009-03-01 00:00:00

abstract：:Foraging segregation may play an important role in the maintenance of animal diversity, and is a proposed mechanism for promoting genetic divergence within seabird species. However, little information exists regarding its presence among seabird populations. We investigated genetic and foraging divergence between two c...

journal_title：Oecologia

authors： Wiley AE,Welch AJ,Ostrom PH,James HF,Stricker CA,Fleischer RC,Gandhi H,Adams J,Ainley DG,Duvall F,Holmes N,Hu D,Judge S,Penniman J,Swindle KA

更新日期：2012-01-01 00:00:00

abstract：:Nutrient resorption, a process by which plants degrade organic compounds and resorb their nutrients from senescing tissues, is a crucial plant function to increase growth and fitness in nutrient-poor environments. Tropical trees on phosphorus (P)-poor soils are particularly known to have high P-resorption efficiency (...

journal_title：Oecologia

authors： Tsujii Y,Onoda Y,Kitayama K

更新日期：2017-10-01 00:00:00

abstract：:Hemiparasitic plants tend to thrive in and significantly affect plant communities in low-nutrient, high-light environments. Hemiparasites are assumed to be weak competitors for light but strong parasites, leading to the prediction that effects on hosts and communities should be a function of resource supply. We invest...

journal_title：Oecologia

authors： Borowicz VA,Armstrong JE

更新日期：2012-07-01 00:00:00

abstract：:This study examines the effect of different densities and the removal of all neighbours at different stages of development on all components of reproduction in the inbreeding annual Thlaspi arvense L. A 64-fold increase in density significantly reduced all repooductive components. The number of flower buds per plant w...

journal_title：Oecologia

authors： Matthies D

更新日期：1990-05-01 00:00:00

abstract：:Genets of Trifolium repens (white clover) were collected from three patches of old permanent pasture dominated by Agrostis capillaris, Holcus lanatus or Lolium perenne. Plants derived from the genets were grown with plants of one grass species present on one side of each T. repens, and a different grass species on the...

journal_title：Oecologia

authors： Turkington R,Hamilton RS,Gliddon C

更新日期：1991-04-01 00:00:00

abstract：:Ring-shaped growth patterns commonly occur in resource-limited arid and semi-arid environments. The spatial distribution, geometry, and scale of vegetation growth patterns result from interactions between biotic and abiotic processes, and, in turn, affect the spatial patterns of soil moisture, sediment transport, and ...

journal_title：Oecologia

authors： Ravi S,D'Odorico P,Wang L,Collins S

更新日期：2008-12-01 00:00:00

abstract：:The rarity of long-range seed dispersal (telechory) and commonness of antitelechory in desert plants are examined in light of contemporary mathematical theories of the evolution of dispersal and germination behaviors. Analysis of dispersal 3-habitat relationships in the flora of Israel supports the general trend towar...

journal_title：Oecologia

authors： Fllner S,Shmida A

更新日期：1981-10-01 00:00:00

abstract：:Sources of variation in floral nectar production were investigated in a natural population of Epilobium canum (Onagraceae), a hummingbird-pollinated herbaceous shrub. Field measurements showed significant phenotypic variation among plants in floral nectar production rates. Average variance among flowers within plants ...

journal_title：Oecologia

authors： Boose DL

更新日期：1997-05-01 00:00:00

abstract：:The energy turnover of weevil populations ofPhyllobius argentatus L.,Polydrosus undatus F., andStrophosomus sp. was investigated in a 123 years old (1970) beech forest in special consideration of their soil-living rhizophagous larvae (results of the energy turnover ofStrophosomus sp. imagines, see Grimm, 1973). I. Lif...

journal_title：Oecologia

authors： Schauermann J

更新日期：1973-12-01 00:00:00

abstract：:The supply of recruits plays an important role in plant and animal population dynamics, and may be governed by environmental and behavioral constraints on animals. Mated females of the mayfly genus Baetis alight on rocks protruding from streams, crawl under water and deposit a single egg mass under a rock. We surveyed...

journal_title：Oecologia

authors： Peckarsky BL,Taylor BW,Caudill CC

更新日期：2000-10-01 00:00:00

abstract：:Future climate scenarios forecast a 10-50% decline in rainfall in Eastern Amazonia. Altered precipitation patterns may change important ecosystem functions like decomposition through either changes in physical and chemical processes or shifts in the activity and/or composition of species. We experimentally manipulated...

journal_title：Oecologia

authors： Rodríguez Pérez H,Borrel G,Leroy C,Carrias JF,Corbara B,Srivastava DS,Céréghino R

更新日期：2018-05-01 00:00:00

abstract：:The diurnal course of the xylem water flow in a solitary Salix fragilis L. tree in a wet grassland was measured using the tissue heat-balance method. There was considerable variation due to meteorological factors. Maximum flow rate was 0.4 kg h-1 m-2 of crown projection area, or 5.9 kg h-1 kg-1 leaf dry weight. The da...

journal_title：Oecologia

authors： Čermák J,Jeník J,Kučera J,Žídek V

更新日期：1984-10-01 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：:The δ 13C, ‰ values of the two principal, widely distributed CAM species in Big Bend National Park, Texas, were examined and related to phytosociologic and macroclimatic parameters. Samples of Agave lecheguilla and Opuntia engelmannii were collected along an elevational gradient covering 1370 m, and δ values for both ...

journal_title：Oecologia

authors： Eickmeier WG,Bender MM

更新日期：1976-12-01 00:00:00

abstract：:The effect of processing of beech leaf litter (Fagus sylvatica L.) of different ages by the diplopodGlomeris marginata (Villers) on status and turnover of microorganisms was investigated in the laboratory. Microbial biomass, basal respiration and metabolic quotient of litter-material from three different beechwood sit...

journal_title：Oecologia

authors： Maraun M,Scheu S

更新日期：1996-03-01 00:00:00