The impact of climatic factors and host density on the long-term population dynamics of vole helminths.

abstract：:Ungulates are important to the diet of bears because they are high in protein, and the level of dietary protein strongly influences bear size. The size a bear obtains as an adult influences important life history characteristics, such as age of reproduction and reproductive success; therefore, it is important to know ...

journal_title：Oecologia

authors： Hatch KA,Kester KA,Auger J,Roeder BL,Bunnell K,Black HL

更新日期：2019-04-01 00:00:00

abstract：:Indirect interactions among plant species mediated by frugivorous animals can be central to population and community dynamics, since the successful seed dispersal of species may depend on facilitative or competitive interactions with heterospecific plants. Yet, empirical evidence on these interactions is very scarce a...

journal_title：Oecologia

authors： Rumeu B,Álvarez-Villanueva M,Arroyo JM,González-Varo JP

更新日期：2019-07-01 00:00:00

abstract：:Increases in terrestrial primary productivity across the Arctic and northern alpine ecosystems are leading to altered vegetation composition and stature. Changes in vegetation stature may affect predator-prey interactions via changes in the prey's ability to detect predators, changes in predation pressure, predator id...

journal_title：Oecologia

authors： Wheeler HC,Chipperfield JD,Roland C,Svenning JC

更新日期：2015-07-01 00:00:00

abstract：:To establish a general model for the removal rate of periphyton by grazers, we identified 27 publications in which removal rates could be estimated from grazer enclosure or exclosure experiments. When all the measurements obtained under different experimental conditions were extracted, these publications provided 107 ...

journal_title：Oecologia

authors： Cattaneo A,Mousseau B

更新日期：1995-08-01 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：:Natural abundance of (15)N and [N] was studied in thalli of mat-forming lichens collected from tundra and heathland sites in the northern and southern hemispheres. The study includes samples of British Cladonia portentosa from sites in regions of high and low N-loading and in heathland growing both directly on peat an...

journal_title：Oecologia

authors： Ellis CJ,Crittenden PD,Scrimgeour CM,Ashcroft C

更新日期：2003-06-01 00:00:00

abstract：:Among 13 tropical tree species on Barro Colorado Island, species with high seedling mortality rates during the first year in shade had higher reltive growth rates (RGR) from germination to 2 months in both sun (23% full sun) and shade [2%, with and without lowered red: far red (R:FR) ratio] than shade tolerant species...

journal_title：Oecologia

authors： Kitajima K

更新日期：1994-08-01 00:00:00

abstract：:Resource supply and pollen delivery are often thought to equally limit seed production in animal-pollinated plants. At equilibrium, plants should show no response to experimental pollen supplementation because resources limit seed set above the current level of pollen attraction, while experimental reduction in pollen...

journal_title：Oecologia

authors： Ornelas JF,Lara C

更新日期：2009-07-01 00:00:00

abstract：:We have been releasing economically unimportant herbivorous mites of one species early in the season and protecting grapevines against another, more damaging herbivorous mite throughout the growing season. In this experiment, releases of economically unimportant Willamette mites alone, or of predatory mites alone, fai...

journal_title：Oecologia

authors： Karban R,Hougen-Eitzmann D,English-Loeb G

更新日期：1994-05-01 00:00:00

abstract：:Larval digenetic trematodes commonly castrate their first intermediate hosts, and should therefore impose strong selection on the timing and mode of host reproduction. Here we examine spatial variation in infection by trematodes in the freshwater snail Potamopyrgus antipodarum. Snails were collected at 11 different si...

journal_title：Oecologia

authors： Jokela J,Lively CM

更新日期：1995-09-01 00:00:00

abstract：:Plant species composition is changing across many landscapes, but it is unclear how these changes affect habitat quality for animals. We used functional diversity and community-weighted mean (CWM) trait values for four plant traits (litter N, P, lignin and soluble phenolics) to explore how changes in plant species com...

journal_title：Oecologia

authors： Cohen JS,Rainford SK,Blossey B

更新日期：2014-04-01 00:00:00

abstract：:To test whether the range of montane Compositae species may be restricted to higher sites because of greater herbivory levels in the lowlands, we transplanted six species, combining them in three species pairs each consisting of a rare montane and a widespread species. Individuals of all species were planted at four s...

journal_title：Oecologia

authors： Scheidel U,Bruelheide H

更新日期：2001-09-01 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：: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：:Field evidence indicates that adult microtines, especially females, may be a major cause of poor juvenile survival and this may be instrumental in their population regulation. This suggests that males and females behave differently towards young animals. To examine how adult males, nonlactating females, and lactating ...

journal_title：Oecologia

authors： Boonstra R

更新日期：1984-04-01 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：:Interactions among granivores and seeds depend on the foraging behaviour and morphology of the granivores and on the attributes and availability of seeds. We investigated seed selection by the seed harvesting ant Messor bouvieri in three adjacent plant communities in Spain by relating the harvested seeds to those in t...

journal_title：Oecologia

authors： Willott SJ,Compton SG,Incoll LD

更新日期：2000-10-01 00:00:00

abstract：:Feeding behavior in B. calyciflorus was observed in both constrained and unconfined individuals. There are at least three mechanisms by which the ingestion of suspended particles may be regulated. First, the cirri of the pseudotrochus may be extended, allowing particles to enter the funnel-shaped buccal field, or they...

journal_title：Oecologia

authors： Gilbert JJ,Starkweather PL

更新日期：1977-06-01 00:00:00

abstract：:Hybridization has been proposed as a mechanism by which exotic plants can increase their invasiveness. By generating novel recombinants, hybridization may result in phenotypes that are better adapted to the new environment than their parental species. We experimentally assessed the resistance of five exotic Fallopia t...

journal_title：Oecologia

authors： Krebs C,Gerber E,Matthies D,Schaffner U

更新日期：2011-12-01 00:00:00

abstract：:The ability to respond in a specific manner to different light conditions imposed by different species of grass is a major factor contributing to white clover persistence in pastures. Gaps in a pasture provide light with a higher red:far-red ratio (R:FR) and higher photosynthetic photon flux density (PPFD) than the li...

journal_title：Oecologia

authors： Marcuvitz S,Turkington R

更新日期：2000-10-01 00:00:00

abstract：:Soil nutrient availability directly enhances vegetative growth, flowering, and fruiting in alpine ecosystems. However, the impacts of nutrient addition on pollinator visitation, which could affect seed output indirectly, are unknown. In a nutrient addition experiment, we tested the hypothesis that seed output in the i...

journal_title：Oecologia

authors： Muñoz AA,Celedon-Neghme C,Cavieres LA,Arroyo MT

更新日期：2005-03-01 00:00:00

abstract：:Every summer the deepest parts of the inner Flensburg fjord are subject to O2-deficiency lasting from a few weeks to several months. In spring, however, populations of Metridium senile can be found in these areas, in spite of the fact that frequently the local anoxic period of the previous summer has been 2-3 times lo...

journal_title：Oecologia

authors： Wahl M

更新日期：1985-09-01 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：:Invertebrate algal grazer densities were manipulated in a temperate river to discover the impact of differences in riffle-scale architectural complexity on the strength of the trophic interaction between grazers and epilithic algae. Animal densities were manipulated by manual removal in architecturally complex boulder...

journal_title：Oecologia

authors： Robson BJ

更新日期：1996-08-01 00:00:00

abstract：:Many studies have shown that nonlethal predator effects such as trait-mediated interactions (TMIs) can have significant impacts on the structure and function of communities, but the role that environmental conditions play in modulating the scale and magnitude of these effects has not been carefully investigated. TMIs ...

journal_title：Oecologia

authors： Smee DL,Ferner MC,Weissburg MJ

更新日期：2008-05-01 00:00:00

abstract：:This is the first study to investigate whether scatter-hoarding behavior, a conditional mutualism, can be disrupted by forest fragmentation. We examined whether acouchies (Myoprocta acouchy, Rodentia) and agoutis (Dasyprocta leporina, Rodentia) changed scatter-hoarding behavior toward seeds of Astrocaryum aculeatum (A...

journal_title：Oecologia

authors： Jorge ML,Howe HF

更新日期：2009-10-01 00:00:00

abstract：:Life history changes may change resource use. Such shifts are not well understood in the dung beetles, despite recognised differences in larval and adult feeding ability. We use the flightless dung beetle Circellium bacchus to explore such shifts, identifying dung sources of adults using DNA metabarcoding, and compari...

journal_title：Oecologia

authors： Kerley GIH,Landman M,Ficetola GF,Boyer F,Bonin A,Rioux D,Taberlet P,Coissac E

更新日期：2018-09-01 00:00:00

abstract：:Plants of Diplacus aurantiacus, a successional shrub common in California chaparral, were grown under controlled conditions in which either quantum flux density or nitrogen availability was varied. Photosynthesis and leaf nitrogen content were determined on a leaf area and a leaf weight basis, and whole plant growth w...

journal_title：Oecologia

authors： Gulmon SL,Chu CC

更新日期：1981-05-01 00:00:00

abstract：:CO2 assimilation rate (A) and leaf conductance (g) were measured in the field on intact branches of 35-year-old Picea abies (L.) Karst. trees, in five plots each in a healthy and a declining stand. The declining site included trees with yellow needles. In order to separate atmospheric effects on gas exchange from effe...

journal_title：Oecologia

authors： Zimmermann R,Oren R,Schulze E-,Werk KS

更新日期：1988-09-01 00:00:00

abstract：:Food availability is thought to strongly influence the leaving phase of natal dispersal in animals with condition-dependent dispersal. We conducted a food supplementation experiment to determine the influence of extra food on the onset of dispersal and early dispersal movement patterns of 42 radio-tagged northern gosh...

journal_title：Oecologia

authors： Kennedy PL,Ward JM

更新日期：2003-01-01 00:00:00