A test of energetic trade-offs between growth and immune function in watersnakes.

abstract：:Parents are expected to overproduce the less costly sex under poor food conditions. The previously regular 3-year cycle in the abundance of voles, the main prey of the Ural owl, Strix uralensis, temporarily disappeared in 1999-2001. We studied Ural owls' parental feeding investment and sex allocation during these poor...

journal_title：Oecologia

authors： Brommer JE,Karell P,Pihlaja T,Painter JN,Primmer CR,Pietiäinen H

更新日期：2003-09-01 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：:Desert annuals of Death Valley, California have higher average light-saturated photosynthetic capacities and leaf nitrogen contents than do early-successional annuals of Illinois. The leaves of annuals in the light-unlimited Death Valley environment change little in specific weight, nitrogen, or photosynthetic capacit...

journal_title：Oecologia

authors： Mooney HA,Field C,Gulmon SL,Bazzaz FA

更新日期：1981-08-01 00:00:00

abstract：:Plants experience unique challenges due to simultaneous life in two spheres, above- and belowground. Interactions with other organisms on one side of the soil surface may have impacts that extend across this boundary. Although our understanding of plant-herbivore interactions is derived largely from studies of leaf he...

journal_title：Oecologia

authors： Barber NA,Adler LS,Bernardo HL

更新日期：2011-02-01 00:00:00

abstract：:We have analysed the importance of worker ants (Proformica longiseta, Formicidae) as pollinators of a mass-flowering woody plant (Hormathophylla spinosa, Cruciferae) in the high-mountain area of the Sierra Nevada (southern Spain). We have quantified the abundance and foraging behavior of P. longiseta in comparison wit...

journal_title：Oecologia

authors： Gómez JM,Zamora R

更新日期：1992-09-01 00:00:00

abstract：:The potential production of estuarine interstitial microalgae from two tidal flats differing in sediment texture was determined manometrically. Sediment cores from the Southbeach tidal flat showed a maximum amount of productivity in the lower intertidal zone whereas sediment cores from Sally's Bend showed no productio...

journal_title：Oecologia

authors： Riznyk RZ,Phinney HK

更新日期：1972-09-01 00:00:00

abstract：:Southern grasshopper mice (Onychomys torridus) were allowed to junt buried mealworms in a laboratory arena. The prey were arranged in two patterns, one aggregated and one relatively dispersed. Mice captured more prey from the dispersed treatment in the 2 h experiment, a result that can be attributed to both the greate...

journal_title：Oecologia

authors： Taylor RJ

更新日期：1977-09-01 00:00:00

abstract：:Predators have far-reaching effects on communities by triggering top-down trophic cascades that influence ecosystem functioning. Omnivory and intraguild interactions between predators give rise to reticulate food webs and may either strengthen or dampen trophic cascades depending on context. Disentangling the effects ...

journal_title：Oecologia

authors： Mestre L,Piñol J,Barrientos JA,Espadaler X

更新日期：2016-01-01 00:00:00

abstract：:For some animals, the habitat which they first experience can influence the type of habitat which they select later in life and, thus, potentially their population distribution and dynamics. However, for many insect herbivores, whose natal habitat may consist of a single hostplant, the consequences of natal hostplant ...

journal_title：Oecologia

authors： Merwin AC,Inouye BD,Underwood N

更新日期：2020-06-01 00:00:00

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：:There is considerable theoretical evidence that a trade-off between competitive and colonization ability enables species coexistence. However, empirical studies testing for the presence of a competition-colonization (CC) trade-off and its importance for species coexistence have found mixed results. In a microcosm expe...

journal_title：Oecologia

authors： Limberger R,Wickham SA

更新日期：2011-11-01 00:00:00

abstract：:The climatic control of productivity for two populations of the lichen Cetraria cucullata (Bell.) Ach. growing in the arctic tundra of northern Alaska (70°28'N, 157°23'W) was examined. Respiratory losses of carbon vary with tissue temperature, tissue water content, and time since wetting. Potential net photosynthetic ...

journal_title：Oecologia

authors： Lechowicz MJ

更新日期：1981-08-01 00:00:00

abstract：:Disturbance is now recognized as a key ecosystem process but few studies have examined its indirect effects on individuals in a population or its relationship to ecological dominance in a community. Using an ecologically dominant small mammal population in experimentally burned habitat as a model, I empirically tested...

journal_title：Oecologia

authors： Plavsic MJ

更新日期：2011-08-01 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：:In resource-limited savannas, the distribution and abundance of fine roots play an important role in acquiring essential resources and structuring vegetation patterns and dynamics. However, little is known regarding the three-dimensional distribution of fine roots in savanna ecosystems at the landscape scale. We quant...

journal_title：Oecologia

authors： Zhou Y,Boutton TW,Wu XB,Wright CL,Dion AL

更新日期：2018-04-01 00:00:00

abstract：:Niche partitioning of resources by plants is believed to be a fundamental aspect of plant coexistence and biogeochemical cycles; however, measurements of the timing and location of resource use are often lacking because of the difficulties of belowground research. To measure niche partitioning of soil water by grasses...

journal_title：Oecologia

authors： Kulmatiski A,Beard KH

更新日期：2013-01-01 00:00:00

abstract：:Mortality estimates for the immature stages of two butterfly species, Danaus plexippus and D. chrysippus, were obtained by observing the survival of egg cohorts on different sized patches of food plants (Asclepias spp.), over a one-year period. Losses were variable (0-100%) but usually high (90% and over) throughout t...

journal_title：Oecologia

authors： Zalucki MP,Kitching RL

更新日期：1982-01-01 00:00:00

abstract：:Herbivore damage often deters pollinator visitation and many invasive plants in North America are pollinator-dependent. This has important implications for the biological control of invasive plants because it means that agents that deter pollinators may have a larger than expected impact on the plant. Yet interactions...

journal_title：Oecologia

authors： Swope SM

更新日期：2014-01-01 00:00:00

abstract：:We examined the relative ability of multiple factors to explain variation in two interrelated life-history traits, interclutch interval and annual reproductive success, in feral pigeons. Seasonal influences, brood size, and female body mass and tarsus length explained significant amounts of variation in interclutch in...

journal_title：Oecologia

authors： Johnson SG,Johnston RF

更新日期：1989-03-01 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：:In five California evergreen trees and shrubs cooccurring in this study but most common in habitats of different moisture availability, leaf nitrogen was a major determinant of photosynthetic capacity. Within each species, stomatal conductance was highly correlated with photosynthetic capacity, resulting in little var...

journal_title：Oecologia

authors： Field C,Merino J,Mooney HA

更新日期：1983-12-01 00:00:00

abstract：:Shorter male larval and pupal durations were sufficient to produce the protandrous emergence pattern of the black swallowtail butterfly. In 9 broods observed under natural conditions, the first male was seen 7.1±6.5 days before the first female, although the peak of captures relative to the first capture was similar i...

journal_title：Oecologia

authors： Lederhouse RC,Finke MD,Scriber JM

更新日期：1982-06-01 00:00:00

abstract：:The dispersal of an endangered beetle, Osmoderma eremita, that lives in tree hollows, was studied by mark-release-recapture with pitfall traps. As only a small proportion of all dispersals is observed by this method, a simulation model was constructed to estimate the dispersal rate per individual. The model results su...

journal_title：Oecologia

authors： Ranius T,Hedin J

更新日期：2001-02-01 00:00:00

abstract：:It is often suggested that habitat attributes and interspecific interactions can cause non-random species co-occurrence patterns, but quantifying their contributions can be difficult. Null models that systematically exclude and include habitat effects can give information on the contribution of these factors to commun...

journal_title：Oecologia

authors： Azeria ET,Ibarzabal J,Hébert C

更新日期：2012-04-01 00:00:00

abstract：:Historically, ecologists have been more interested in organisms feeding at the tops of food chains than in organisms feeding at or near the bottom. The problem of taxonomic and trophic inconsistency within and among described food webs is central to criticisms of contemporary food web research. To study the effects of...

journal_title：Oecologia

authors： Sugihara G,Bersier LF,Schoenly K

更新日期：1997-10-01 00:00:00

abstract：:(1) Wars between colonies of the red wood ant, Formica polyctena (Foerst.), are very common in the study area, a dune valley near The Hague, The Netherlands. In an extensive study Mabelis (1979) has put forward a hypothesis that explains the occurrence of wars in terms of protein supply in periods of insufficient prey...

journal_title：Oecologia

authors： Driessen GJ,Van Raalte AT,De Bruyn GJ

更新日期：1984-07-01 00:00:00

abstract：:The tadpoles of two anuran species, Rana sylvatica and Xenopus laevis, were fed various concentrations of two algae, Anabaena sphaerica (large filaments) and Chlorella pyrenoidosa (small unicells). Filtering rates were measured indirectly with a Coulter Counter system; buccal pumping rates were observed directly.Exper...

journal_title：Oecologia

authors： Seale DB,Wassersug RJ

更新日期：1979-01-01 00:00:00

abstract：:The seasonal and long-term population dynamics of helminths parasitizing voles suggested that density-dependent factors might be important in the population dynamics of common species, whereas density-independent factors predominate in the regulation of the rare species. To test this, we used single and multiple regre...

journal_title：Oecologia

authors： Haukisalmi V,Henttonen H

更新日期：1990-06-01 00:00:00

abstract：:The effects of notonectid-induced crests on growth and reproduction, and resource allocation to crest construction, moult losses and eggs of Daphnia carinata were measured. An attempt was made to elucidate the mechanisms of physiological costs of crest induction for this species. The crested morph of d. carinata reach...

journal_title：Oecologia

authors： Barry MJ

更新日期：1994-03-01 00:00:00

abstract：:As humans continue to alter tropical landscapes across the world, it is important to understand what environmental factors help determine the persistence of biodiversity in modified ecosystems. Studies on well-known taxonomic groups can offer critical insights as to the fate of biodiversity in these modified systems. ...

journal_title：Oecologia

authors： Moura NG,Lees AC,Aleixo A,Barlow J,Berenguer E,Ferreira J,Mac Nally R,Thomson JR,Gardner TA

更新日期：2016-03-01 00:00:00