Resource allocation in Tomocerus flavescens (Insecta, Collembola): a study with C-14-labelled food.

abstract：:Populations with dispersive larvae are often demographically open such that local reproduction and subsequent larval settlement are not linked. Thus, understanding whether and how settlement patterns are established and subsequently modified is central to understanding local demography. Settlement is typically not mea...

journal_title：Oecologia

authors： Webster MS

更新日期：2002-03-01 00:00:00

abstract：:Allelochemicals defend plants against herbivore and pathogen attack aboveground and belowground. Whether such plant defenses incur ecological costs by reducing benefits from plant mutualistic symbionts is largely unknown. We explored a potential trade-off between inherent plant chemical defense and belowground mutuali...

journal_title：Oecologia

authors： De Deyn GB,Biere A,van der Putten WH,Wagenaar R,Klironomos JN

更新日期：2009-06-01 00:00:00

abstract：:The factors that promote ecological separation among closely related sympatric carnivores in tropical forests are poorly understood due to a paucity of field studies. Here, we report on community-wide food resource utilization patterns among eight co-existing carnivores in the Dzanga-Sangha Reserve, Central African Re...

journal_title：Oecologia

authors： Ray J,Sunquist M

更新日期：2001-05-01 00:00:00

abstract：:Water stress and temperature effects on growth, translocation and reallocation of 14C assimilated by blue grama (Bouteloua gracilis (H.B.K.) Lag. ex Steud.) were studied for sods extracted from shortgrass prairie. The sods were kept at either 24°/16° or 34°/16°C (day/nigh) temperatures and were labeled at two phenolog...

journal_title：Oecologia

authors： Chung HH,Trlica MJ

更新日期：1980-01-01 00:00:00

abstract：:Changing environments can have divergent effects on biodiversity-ecosystem function relationships at alternating trophic levels. Freshwater mussels fertilize stream foodwebs through nutrient excretion, and mussel species-specific excretion rates depend on environmental conditions. We asked how differences in mussel di...

journal_title：Oecologia

authors： Spooner DE,Vaughn CC,Galbraith HS

更新日期：2012-02-01 00:00:00

abstract：:Dissolved O(2) is an important aquatic ecosystem health indicator. Metabolic and gas exchange (G) rates, which control O(2) concentration, are affected by nutrient loading and other environmental factors. Traditionally, aquatic metabolism has been reported as primary production:community respiration (P:R) ratios using...

journal_title：Oecologia

authors： Venkiteswaran JJ,Wassenaar LI,Schiff SL

更新日期：2007-08-01 00:00:00

abstract：:A traditional view of diverse floral traits is that they reflect differences in foraging preferences of pollinators. The role of pollinators in the evolution of floral traits has been questioned recently by broad community surveys, especially studies concerning variation in pollinator assemblages and visitation freque...

journal_title：Oecologia

authors： Gong YB,Huang SQ

更新日期：2011-07-01 00:00:00

abstract：:Tooth enamel apatite carbonate carbon and oxygen isotope ratios of modern kangaroos (Macropus spp.) collected on a 900-km latitudinal transect spanning a C(3)-C(4) transition zone were analysed to create a reference set for palaeoenvironmental reconstruction in southern Australia. The carbon isotope composition of ena...

journal_title：Oecologia

authors： Brookman TH,Ambrose SH

更新日期：2013-02-01 00:00:00

abstract：:Laboratory feeding experiments were conducted with Dipodomys ordii and Perognathus flavus in an attempt to discover a mechanism which might result in seed size selection. There was no marked difference in the proportions of four seed types collected whether the rodents foraged in the presence or absence of one another...

journal_title：Oecologia

authors： Hutto RL

更新日期：1978-01-01 00:00:00

abstract：:Ecologically isolated habitats (e.g., oceanic islands) favor the appearance of small assemblages of pollinators, generally characterized by highly contrasted life modes (e.g., birds, lizards), and opportunistic nectar-feeding behavior. Different life modes should promote a low functional equivalence among pollinators,...

journal_title：Oecologia

authors： Rodríguez-Rodríguez MC,Jordano P,Valido A

更新日期：2013-09-01 00:00:00

abstract：:The validity of nutrient use efficiency as a central concept in ecosystem ecology has recently been subject to challenge based upon arguments over autocorrelation of data, interpretation of graphical approaches, and appropriate statistical analyses. Much of the confusion on the measurement and interpretation of nutrie...

journal_title：Oecologia

authors： Pastor J,Bridgham SD

更新日期：1999-01-01 00:00:00

abstract：:Although insect herbivores have many well documented effects on plant performance, there are few studies that assess the impact of above-ground herbivory on below-ground plant growth. For a seven year period in which no large-scale herbivore outbreaks occurred, a broad spectrum insecticide was utilized to suppress her...

journal_title：Oecologia

authors： Cain ML,Carson WP,Root RB

更新日期：1991-10-01 00:00:00

abstract：:Although florivores can destroy significant amounts of sexual tissues and indirectly affect pollination, little is known about their preferences, which could shape the evolution of floral traits or defense. In this study, we used a gynodioecious plant Nemophila menziesii, and its main florivore Platyprepia virginalis,...

journal_title：Oecologia

authors： McCall AC,Barr CM

更新日期：2012-09-01 00:00:00

abstract：:Bromus tectorum L. dominates sites of large-scale disturbance, while Poa pratensis L. dominates the sites of small-scale disturbance in the Festuca/Symphoricarpos habitat type in eastern Washington (USA). The role of incident irradiation in influencing these distributions was examined using field and glasshouse experi...

journal_title：Oecologia

authors： Bookman PA,Mack RN

更新日期：1983-03-01 00:00:00

abstract：:The tenets of optimal foraging theory are used to contrast the behavior of the predatory snail Acantina spirata when feeding on the barnacles Balanus glandula and Chthamalus fissus under conditions of satiation and starvation. As predicted in optimal diet models, A. spirata is less selective (ratio of attack frequency...

journal_title：Oecologia

authors： Perry DM

更新日期：1987-06-01 00:00:00

abstract：:I increased the availability of tadpole-rearing sites (bromeliads) and oviposition sites (leaf litter) and examined the effects on space-use patterns in adult Dendrobates pumilio at the La Selva Biological Reserve in northeastern Costa Rica. I made 4158 observations of 986 marked adults during the seven-month study pe...

journal_title：Oecologia

authors： Donnelly MA

更新日期：1989-10-01 00:00:00

abstract：:Populations of dioecious plant species often exhibit biased sex ratios. Such biases may arise as a result of sex-based differences in life history traits, or as a result of spatial segregation of the sexes. Of these, sex-based differentiation in life history traits is likely to be the most common cause of bias. In dio...

journal_title：Oecologia

authors： Nicotra AB

更新日期：1998-06-01 00:00:00

abstract：:Differential predation pressure and the probability of predation on a Batesian mimicry complex and on alternative prey were estimatedin a field experiment. The mimicry complex was composed of a noxious model (Eleodes obscura (Say)) and a palatable mimic (Stenomorpha marginata (LeConte)). House crickets (Acheta domesti...

journal_title：Oecologia

authors： Hetz M,Slobodchikoff CN

更新日期：1988-09-01 00:00:00

abstract：:The carabid beetle Nebria brevicollis (F.), despite being macropterous, has a very low flight potential. Only a few percent of the beetles has functional flight muscles, flight motivation is low, and the period favourable for flight is short. The inability to fly is caused mainly by arrested development of the flight ...

journal_title：Oecologia

authors： Nelemans MN

更新日期：1987-07-01 00:00:00

abstract：:The effect of drought on embryonic development and on hatching was studied in 13 European Tettigoniidae species. Drought can affect development in three different ways: (1) Embryonic development proceeds slower than if the eggs are in contact with water; (2) it stops (for final diapause) in an earlier embryonic stage;...

journal_title：Oecologia

authors： Ingrisch S

更新日期：1986-11-01 00:00:00

abstract：:It is widely recognized that pollinators vary in their effectiveness in pollination mutualisms, due both to differences in flower-pollinator morphological fit as well as pollinator behaviour. However, pollination webs typically treat all interactions as equal, and we contend that this method may provide misleading res...

journal_title：Oecologia

authors： Sánchez-Lafuente AM,Rodríguez-Gironés MA,Parra R

更新日期：2012-01-01 00:00:00

abstract：:We investigated seasonality of gender differences in the patterns of flea infestation in nine rodent species to test if sex-biased parasitism in terms of mean abundance, species richness, prevalence and the level of aggregation (a) varies among hosts and between seasons, and (b) is linked to sexual size dimorphism. Se...

journal_title：Oecologia

authors： Krasnov BR,Morand S,Hawlena H,Khokhlova IS,Shenbrot GI

更新日期：2005-12-01 00:00:00

abstract：:We tested the deme-formation hypothesis experimentally with four populations of leaf-galling grape phylloxera, Daktulosphaira vitifoliae, and its host, canyon grape (Vitis arizonica). An experiment designed to examine preference and performance showed that phylloxera populations did not significantly prefer their orig...

journal_title：Oecologia

authors： Kimberling DN,Price PW

更新日期：1996-09-01 00:00:00

abstract：:Plants of the cerrado tree species Qualea grandiflora and the annual herb Bidens gardneri were grown from seed in controlled environment rooms at 30/20° C and 12 hour photoperiod. Seedlings were grown in pots or small tubes containing sand and provided with various amounts of mineral solutions based on the formulation...

journal_title：Oecologia

authors： Felippe GM,Dale JE

更新日期：1990-01-01 00:00:00

abstract：:Studies of phenotypic variation in nature often consider only a single potential selective agent. In such cases, it remains an open question as to whether variation attributed to that single measured agent might be influenced by some other unmeasured agent. Previous research has shown that phenotypic variation in the ...

journal_title：Oecologia

authors： Gotanda KM,Delaire LC,Raeymaekers JA,Pérez-Jvostov F,Dargent F,Bentzen P,Scott ME,Fussmann GF,Hendry AP

更新日期：2013-05-01 00:00:00

abstract：:The photosynthetic responses of a range of trebouxioid lichens were investigated to determine whether variations in net assimilation rates shown by populations of the same species collected from different habitats could be correlated with adjustments in carbon-concentrating mechanism (CCM) activity. The activity of a ...

journal_title：Oecologia

authors： Smith EC,Griffiths H

更新日期：1998-01-01 00:00:00

abstract：:The infestation of small alpine mammals with fleas during the year and at different altitudes was investigated. The data are based on an investigation carried out between 1966 and 1969 in Tirol (Austria) in different altitudinal zones of the alps, 1136 fleas having been collected from 625 insectivores and rodents. By ...

journal_title：Oecologia

authors： Mahnert V

更新日期：1972-12-01 00:00:00

abstract：:The sensible and latent heat losses of a maritime pine stand (Pinus pinaster Aiton) and of its understorey were measured in Portugal, in conditions of mild water stress, using an eddy covariance technique (monodimensional sonic anemometer coupled with a thin thermocouple and a fast-response hygrometer) at two levels a...

journal_title：Oecologia

authors： Berbigier P,Bonnefond JM,Loustau D,Ferreira MI,David JS,Pereira JS

更新日期：1996-03-01 00:00:00

abstract：:The reproductive behaviour of the toad Bufo calamita was studied in a large population in the northern Rhineland, Germany. Toads bred at four spatially separated but neighbouring areas including 34 breeding ponds. Three methods were applied to monitor quantitatively the intensity of breeding and migratory activity: ca...

journal_title：Oecologia

authors： Sinsch U

更新日期：1988-08-01 00:00:00

abstract：:The up-regulation of secondary metabolic pathways following herbivore attack and the subsequent reduction in herbivore performance have been identified in numerous woody plant species. Eucalypts constitutively express many secondary metabolites in the leaves, including terpenes and formylated phloroglucinol compounds ...

journal_title：Oecologia

authors： Henery ML,Wallis IR,Stone C,Foley WJ

更新日期：2008-07-01 00:00:00