Novel interactions of non-pollinating ants with pollinators and fruit consumers in a tropical forest.

abstract：:Concentration and isotopic composition (δ13C and δ18O) of ambient CO2 and water vapour were determined within a Quercus petraea canopy, Northumberland, UK. From continuous measurements made across a 36-h period from three heights within the forest canopy, we generated mixing lines (Keeling plots) for δa13CO2, δa C18O1...

journal_title：Oecologia

authors： Harwood KG,Gillon JS,Roberts A,Griffiths H

更新日期：1999-04-01 00:00:00

abstract：:Anthropogenic disturbance can have important indirect effects on ecosystems by disrupting species interactions. Here we examine the effects of anthropogenic disturbance on distance dispersal by ants for the diaspores of myrmecochorous Euphorbiaceae in Brazilian Caatinga. Rates of diaspore removal and distances removed...

journal_title：Oecologia

authors： Leal LC,Andersen AN,Leal IR

更新日期：2014-01-01 00:00:00

abstract：:Genetic introgression has been suggested as a management tool for mitigating detrimental effects of inbreeding depression, but the role of introgression in species conservation has been controversial, partly because population-level impacts of genetic introgressions are not well understood. Concerns about potential in...

journal_title：Oecologia

authors： Hostetler JA,Onorato DP,Bolker BM,Johnson WE,O'Brien SJ,Jansen D,Oli MK

更新日期：2012-01-01 00:00:00

abstract：:Endozoochory plays a prominent role for the dispersal of seed plants, and dispersal vectors are well known. However, for taxa such as ferns and bryophytes, endozoochory has only been suggested anecdotally but never tested in controlled experiments. We fed fertile leaflets of three ferns and capsules of four bryophyte ...

journal_title：Oecologia

authors： Boch S,Berlinger M,Fischer M,Knop E,Nentwig W,Türke M,Prati D

更新日期：2013-07-01 00:00:00

abstract：:Spatial distribution in the two collembolan species Tomocerus minor and Orchesella cincta is greatly influenced by the distribution of the environmental factors water and food. T. minor is totally restricted in distribution to water-saturated places, where it forms spaced-out aggregations. O. cincta assembles in water...

journal_title：Oecologia

authors： Verhoef HA,Nagelkerke CJ

更新日期：1977-01-01 00:00:00

abstract：:In common with samples from less taxonomically constrained studies, significant correlations exist between the numbers of predatory and non-predatory species in assemblages of terrestrial beetles. Under logarithmic transformation the relationship can be described reasonably well by a straight line. Explanations for pr...

journal_title：Oecologia

authors： Gaston KJ,Warren PH,Hammond PM

更新日期：1992-06-01 00:00:00

abstract：:Herbivores are thought to achieve adequate nutrition by consuming numerous species of plants or by occasionally consuming animal tissue. Although active selection of diverse foods is common in nature, the relationship between diet mixing and consumer fitness is poorly understood, especially in marine environments. We ...

journal_title：Oecologia

authors： Cruz-Rivera E,Hay ME

更新日期：2000-05-01 00:00:00

abstract：:While elaborate carotenoid-based traits in adult birds may have evolved as honest signals of individual quality in the context of sexual selection or other social interactions, the function of carotenoid-based colours in juveniles is less well understood. We investigated the hypothesis that carotenoid-based nestling c...

journal_title：Oecologia

authors： Tschirren B,Fitze PS,Richner H

更新日期：2005-04-01 00:00:00

abstract：:Resource competition is commonly invoked to explain negative effects of invasive plants on native plant abundance. If invasives out-compete natives, global changes that elevate resource availability may interact with invasives to exacerbate impacts on native communities. Indeed, evidence is accumulating that elevated ...

journal_title：Oecologia

authors： Bradford MA,Schumacher HB,Catovsky S,Eggers T,Newingtion JE,Tordoff GM

更新日期：2007-07-01 00:00:00

abstract：:During the inventory of ant heaps of the group Formica rufa, performed in the years 1972-73 in the Wielkopolski National Park near Poznań, it was found that the vegetal cover composition, determining to a large extent phytosociologic associations, is likely not so important to ants as the dominant stand. First of all,...

journal_title：Oecologia

authors： Wiśniewski J

更新日期：1976-06-01 00:00:00

abstract：:The demographic and ecological characteristics of island populations of small mammals have received increasing attention in recent years, but few studies have compared the behavioral characteristics of island populations with those of mainland populations. Behavior is considered an important variable because it is bel...

journal_title：Oecologia

authors： Halpin ZT

更新日期：1981-01-01 00:00:00

abstract：:Wire cages with different-sized meshes were placed on trunks and around leaves at different heights in oak trees and in forest litter. Gypsy moth, Lymantria dispar, instars II-V tethered with threads were placed in each cage (instars II-III only in leaf cages) as well as outside the cages. Predation of larvae decrease...

journal_title：Oecologia

authors： Weseloh RM

更新日期：1988-11-01 00:00:00

abstract：:Energy metabolism (oxygen consumption) in acclimated juvenile yellow banded and unbanded Cepaea hortensis Müll. was measured at 5°, 10°, 15°, 20°, and 25°C with Englemann respirometers. Metabolic rates were also measured after abrupt temperature changes from 5° to 20° and from 25° to 10°C.Energy metabolism in the two ...

journal_title：Oecologia

authors： Steigen AL

更新日期：1979-08-01 00:00:00

abstract：:Twenty nine harpacticoid copepods are new to Bermuda and significant changes are noted in the distribution records of several species. Six temporary groups are organized to separate the copepods on their apparent zoogeographical ranges: (1) cosmopolitan, (2) warm temperate-tropical, (3) North Atlantic, (4) North Atlan...

journal_title：Oecologia

authors： Coull BC,Herman SS

更新日期：1970-12-01 00:00:00

abstract：:During a severe outbreak of sarcoptic mange (Sarcoptes scabiei vulpes) starting among red foxes (Vulpes vulpes) in Sweden in the 1970s, we studied: 1) the establishment and spread of the disease in northernmost Sweden (by inquiries), and 2) the 1970-84 bag records for foxes and mountain hares (Lepus timidus) (an alter...

journal_title：Oecologia

authors： Danell K,Hörnfeldt B

更新日期：1987-10-01 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：:Atmospheric inputs of N and S in bulk deposition (open collectors) and throughfall (beneath canopy collectors) were measured in and adjacent to two Class 1 wilderness areas of the northeastern US. In general, atmospheric S inputs followed our expectations with throughfall S fluxes increasing with elevation in the Whit...

journal_title：Oecologia

authors： Templer PH,Weathers KC,Lindsey A,Lenoir K,Scott L

更新日期：2015-01-01 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：:During the course of a 10-year investigation on the population dynamics of Dryocosmus kuriphilus, a rapid decrease in the number of individuals was noticed in the adult stage. To detect the role of predation by spiders in causing this high adult mortality, spiders collected from the survey station were tested for thei...

journal_title：Oecologia

authors： Nakamura M,Nakamura K

更新日期：1977-06-01 00:00:00

abstract：:The spatial context in which seed predation occurs may modify the spatial structure of recruitment generated by seed dispersal. The Janzen-Connell (J-C) model predicts that granivores will exert greater pressure on the parent plant or at those sites where the density of dispersed seeds is higher. We have investigated ...

journal_title：Oecologia

authors： Blendinger PG,Díaz-Vélez MC

更新日期：2010-06-01 00:00:00

abstract：:The size of forest fragments, the use of land bordering fragments, and the distance of nests from an edge all affect the frequency of predation upon bird nests in Maine (USA), an area where the forest has been fragmented by roads, but not significantly reduced in area. We placed artificial nests containing quail eggs ...

journal_title：Oecologia

authors： Small MF,Hunter ML

更新日期：1988-06-01 00:00:00

abstract：:The growth of metacommunity ecology as a subdiscipline has increased interest in how processes at different spatial scales structure communities. However, there is still a significant knowledge gap with respect to relating the action of niche- and dispersal-assembly mechanisms to observed species distributions across ...

journal_title：Oecologia

authors： McCauley SJ,Davis CJ,Relyea RA,Yurewicz KL,Skelly DK,Werner EE

更新日期：2008-11-01 00:00:00

abstract：:Relationships involving fire and perennial grasses are controversial in Chihuahuan Desert grasslands of southern New Mexico, USA. Research suggests that fire delays the resprouting of perennial grasses well after two growing seasons. However, such results are confounded by livestock grazing, soil erosion, and drought....

journal_title：Oecologia

authors： Drewa PB,Peters DP,Havstad KM

更新日期：2006-11-01 00:00:00

abstract：:The fate of individual plants of Helianthus annuus was monitored in populations sown at a density of 650 seeds m-2. Ninety six percent of the seeds germinated but only fifty two percent of the seedlings survived to the end of the experiment due to self-thinning. Whilst the seedlings emerged over only four days the cot...

journal_title：Oecologia

authors： Watkinson AR,Lonsdale WM,Firbank LG

更新日期：1983-02-01 00:00:00

abstract：:The effects of irradiance during growth on biomass allocation, growth rates, leaf chlorophyll and protein contents, and on gas exchange responses to irradiance and CO2 partial pressures of the evergreen, sclerophyllous, chaparral shrub, Ceanothus megacarpus were determined. Plants were grown at 4 irradiances for the g...

journal_title：Oecologia

authors： Mahall BE,Schlesinger WH

更新日期：1982-09-01 00:00:00

abstract：:The Egyptian Zygophyllum species, though limited in number, contribute in considerable measure to the desert vegetation. They represent a group of succulent plants which are drought resistant or salt tolerant living under severe dry climatic conditions. Their abundance is attributed to these characteristics in additio...

journal_title：Oecologia

authors： Batanouny KH,Ezzat NH

更新日期：1971-06-01 00:00:00

abstract：:Host plant use and availability were determined in early nymphal and adult-stage Schistocerca emarginata (=lineata) (Orthoptera: Acrididae) populations at six localities in Texas, USA. Early instar nymphal populations were feeding almost exclusively on either Ptelea trifoliata (Rutaceae) or Rubus trivialis (Rosaceae)....

journal_title：Oecologia

authors： Sword GA,Dopman EB

更新日期：1999-08-01 00:00:00

abstract：:Landscape position, grazing, and seasonal variation in precipitation and temperature create spatial and temporal variability in soil processes, and plant biomass and composition in grasslands. However, it is unclear how this variation in plant and soil properties affects carbon dioxide (CO2) fluxes. The aim of this st...

journal_title：Oecologia

authors： Risch AC,Frank DA

更新日期：2006-03-01 00:00:00

abstract：:Interspecific hybridization is an important and common evolutionary mechanism, but field-based evaluations of changes in realized niches and zonation patterns of native and exotic hybrids relative to those of their parental plant species are rare. Would native hybrids forming hybrid zones between their parental specie...

journal_title：Oecologia

authors： Gallego-Tévar B,Curado G,Grewell BJ,Figueroa ME,Castillo JM

更新日期：2018-11-01 00:00:00

abstract：:The effect of N supply on shoot and leaf lifespan was investigated in established stands of four herbaceous Carex species which differed in maximum dry matter production. These species were, in rank order of increasing maximum dry matter production (per unit ground area): Carex diandra≤C. rostrata

journal_title：Oecologia

authors： Aerts R,de Caluwe H

更新日期：1995-06-01 00:00:00