A test of multiple hypotheses for the species richness gradient of South American owls.

abstract：:We tested the hypothesis that leaves of broad-leaved tree species are more highly defended at low latitudes than at high latitudes. We used canonical discriminant analysis to compare tree species from Panama (9°N, 39 species), Missouri, USA (38°N, 37 species), and southern Ontario, Canada (44°N, 34 species) with respe...

journal_title：Oecologia

authors： Marquis RJ,Ricklefs RE,Abdala-Roberts L

更新日期：2012-07-01 00:00:00

abstract：:Studies of population dynamics of long-lived species have generally focused on adult survival because population growth should be most sensitive to this parameter. However, actual variations in population size can often be driven by other demographic parameters, such as juvenile survival, when they show high temporal ...

journal_title：Oecologia

authors： Souchay G,Gauthier G,Pradel R

更新日期：2013-09-01 00:00:00

abstract：:An "environmental productivity index" based on physiological responses to three environmental variables was used to predict the net productivity of a common succulent perennial of the Sonoran Desert, Agave deserti, on a monthly basis. Productivity was also independently measured in the field from dry weight changes. T...

journal_title：Oecologia

authors： Nobel PS

更新日期：1984-09-01 00:00:00

abstract：:Although ecological disturbances can have a strong influence on pollinators through changes in habitat, virtually no studies have quantified how characteristics of wildfire influence the demography of essential pollinators. Nevertheless, evaluating this topic is critical for understanding how wildfire is linked to pol...

journal_title：Oecologia

authors： Galbraith SM,Cane JH,Rivers JW

更新日期：2021-01-03 00:00:00

abstract：:In ant-plant symbioses, the behavior of ant inhabitants affects the nature of the interaction, ranging from mutualism to parasitism. Mutualistic species confer a benefit to the plant, while parasites reap the benefits of the interaction without reciprocating, potentially resulting in a negative impact on the host plan...

journal_title：Oecologia

authors： Tillberg CV

更新日期：2004-08-01 00:00:00

abstract：:A rich mammalian fauna is found on islands that lie on the Sunda Shelf, a continental shelf extending from Vietnam to Borneo and Java that was periodically exposed as dry land during the Pleistocene. The correlation between log of island area and number of species is high (r 2=0.94); the slope of the curve is moderate...

journal_title：Oecologia

authors： Heaney LR

更新日期：1984-01-01 00:00:00

abstract：:As the Arctic warms, tundra vegetation is becoming taller and more structurally complex, as tall deciduous shrubs become increasingly dominant. Emerging studies reveal that shrubs exhibit photosynthetic resource partitioning, akin to forests, that may need accounting for in the "big leaf" net ecosystem exchange models...

journal_title：Oecologia

authors： Boelman NT,Magney TS,Logan BA,Griffin KL,Eitel JU,Greaves H,Prager CM,Vierling LA

更新日期：2016-09-01 00:00:00

abstract：:Selection of sites for oviposition when the risk of predation by green frogs was variable studied in tandems of the damselfly Pyrrhosoma nymphula. In the absence of predators the number of tandems landing increased with the size of the oviposition site and with the number of pairs already present. Pairs approaching an...

journal_title：Oecologia

authors： Rehfeldt GE

更新日期：1990-12-01 00:00:00

abstract：:Prescribed burning is a major control over element cycles in Tallgrass prairie (Eastern Kansas, USA). In this paper we report potential effects of fire on nonsymbiotic nitrogen fixation. Fire resulted in additions of available P in ash, which may stimulate nitrogen fixation by terrestrial cyanobacteria. Cyanobacterial...

journal_title：Oecologia

authors： Eisele KA,Schimel DS,Kapustka LA,Parton WJ

更新日期：1989-06-01 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：: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：:Short-term effects of environmental perturbations on various life history traits are reasonably well documented in birds and mammals. But, in the present context of global climate change, there is a need to consider potential long-term effects of natal conditions to better understand and predict the consequences of th...

journal_title：Oecologia

authors： Nevoux M,Weimerskirch H,Barbraud C

更新日期：2010-02-01 00:00:00

abstract：:Understanding the mechanisms producing and maintaining discontinuities between patches in mosaics of habitats is necessary to predict changes in patterns of abundance and distribution of species. On temperate rocky reefs, physical and biological disturbance can result in a mosaic of patches of encrusting coralline, tu...

journal_title：Oecologia

authors： Bulleri F,Benedetti-Cecchi L

更新日期：2006-09-01 00:00:00

abstract：:Not all hosts, communities or environments are equally hospitable for parasites. Direct and indirect interactions between parasites and their predators, competitors and the environment can influence variability in host exposure, susceptibility and subsequent infection, and these influences may vary across spatial scal...

journal_title：Oecologia

authors： Gehman AM,Grabowski JH,Hughes AR,Kimbro DL,Piehler MF,Byers JE

更新日期：2017-01-01 00:00:00

abstract：:An empirical model for predicting net photosynthesis (P N ) and dark respiration (R D ) in the field was developed and tested for Bouteloua gracilis (H.B.K.) Lag., the dominant C4 grass of the North American shortgrass prairie. P N is predicted as a function of soil water potential, canopy air temperature, irradiance,...

journal_title：Oecologia

authors： Detling JK,Parton WJ,Hunt HW

更新日期：1978-01-01 00:00:00

abstract：:Several studies have suggested that aquatic microcrustaceans are relatively efficient dispersers in a variety of landscapes, whereas others have indicated dispersal limitation at large spatial scales or under specific circumstances. Based on a survey of a set of recently created ponds in an area of approximately 18 × ...

journal_title：Oecologia

authors： Juračka PJ,Declerck SA,Vondrák D,Beran L,Černý M,Petrusek A

更新日期：2016-03-01 00:00:00

abstract：:Eggs of the elm leaf beetle Xanthogaleruca luteola are often heavily attacked by the chalcidoid wasp Oomyzus gallerucae. We studied the chemical signals mediating interactions between the egg parasitoid, its host, and the plant Ulmus campestris. Olfactometer bioassays with O. gallerucae showed that volatiles of the ho...

journal_title：Oecologia

authors： Meiners T,Hilker M

更新日期：1997-09-01 00:00:00

abstract：:Existing models of microtine population regulation and life history evolution rely on data derived from empirical studies which assume spatial homogeneity of the sampling unit, and infer that population dynamics can be described adequately by aggregation of individuals differing in sex, age and social status. These as...

journal_title：Oecologia

authors： Cockburn A,Lidicker WZ Jr

更新日期：1983-09-01 00:00:00

abstract：:The duration and amount of water captured on leaves and its functional significance is highly varied. Leaf surface wettability influences water absorption, gas exchange, pathogen infection, nutrient leaching, contamination by pollutants, self-cleaning properties and in freezing environments the probability of extrinsi...

journal_title：Oecologia

authors： Aryal B,Neuner G

更新日期：2010-01-01 00:00:00

abstract：:Common generalizations concerning the ecologic significance of C4 photosynthesis were tested in a study of plant gas exchange, productivity, carbon balance, and water use in monospecific communities of C3 and C4 salt desert shrubs. Contrary to expectations, few of the hypotheses concerning the performance of C4 specie...

journal_title：Oecologia

authors： Caldwell MM,White RS,Moore RT,Camp LB

更新日期：1977-12-01 00:00:00

abstract：:Understanding the effects of invasive plants on native consumers is important because consumer-mediated indirect effects have the potential to alter the dynamics of coexistence in native communities. Invasive plants may promote changes in consumer pressure due to changes in protective cover (i.e., the architectural co...

journal_title：Oecologia

authors： Dutra HP,Barnett K,Reinhardt JR,Marquis RJ,Orrock JL

更新日期：2011-07-01 00:00:00

abstract：:In many mammals, early survival differs between the sexes, with males proving the more fragile sex ["Fragile male (FM) hypothesis"], especially in sexually dimorphic species where males are the larger sex. Male-biased allocation (MBA) by females may offset this difference. Here, we evaluate support for the FM and MBA ...

journal_title：Oecologia

authors： Kraus C,Mueller B,Meise K,Piedrahita P,Pörschmann U,Trillmich F

更新日期：2013-04-01 00:00:00

abstract：:Plant isoprene emissions are known to contribute to abiotic stress tolerance, especially during episodes of high temperature and drought, and during cellular oxidative stress. Recent studies have shown that genetic transformations to add or remove isoprene emissions cause a cascade of cellular modifications that inclu...

journal_title：Oecologia

authors： Monson RK,Weraduwage SM,Rosenkranz M,Schnitzler JP,Sharkey TD

更新日期：2021-01-08 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：: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：:Plants of white clover Trifolium repens were grown under the canopies of three grass species, Lolium perenne, Agrostis tenuis and Holcus lanatus, and under simulated canopies of black polythene and controls were exposed to unfiltered natural radiation. The canopies were adjusted so that they transmitted equal intensit...

journal_title：Oecologia

authors： Thompson L,Harper JL

更新日期：1988-04-01 00:00:00

abstract：:Breeding birds were censused along four elevational gradients in the Adirondack Mountains, New York, and the Green Mountains, Vermont. The bird communities of the four gradients were basically similar in species composition, richness and amplitude patterns. Three measures of species diversity decreased with increasing...

journal_title：Oecologia

authors： Able KP,Noon BR

更新日期：1976-09-01 00:00:00

abstract：:In this study we examine the influence of temperature on growth, photosynthetic performance and acclimation of two submerged macrophyte species, Elodea canadensis L.C. Rich and Ranunculus aquatilis (L.) Wimmer. The plants were grown at 5, 10 and 15°C and a photon flux density of 300 μmol m-2 s-1 (PAR) in a medium with...

journal_title：Oecologia

authors： Madsen TV,Brix H

更新日期：1997-04-01 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：:We report a new obligate pollination mutualism involving the senita cactus, Lophocereus schottii (Cactaceae, Pachyceereae), and the senita moth, Upiga virescens (Pyralidae, Glaphyriinae) in the Sonoran Desert and discuss the evolution of specialized pollination mutualisms. L. schottii is a night-blooming, self-incompa...

journal_title：Oecologia

authors： Fleming TH,Holland JN

更新日期：1998-04-01 00:00:00