Tree decline in southeastern Australia: Nitrate reductase activity and indications of unbalanced nutrition in Eucalyptus ovata (Labill.) and E. camphora (R.T. Baker) communities at Yellingbo, Victoria.

abstract：:The foraging behavior of Mesocyclops edax in artificial patches of high and low prey density was examined. In low density patches Mesocyclops swam in an irregular curvilinear path with little or no looping behavior. In high density patches Mesocyclops exhibited extensive horizontal and vertical looping behavior. Horiz...

journal_title：Oecologia

authors： Williamson CE

更新日期：1981-09-01 00:00:00

abstract：:Phenolics in marine brown algae have been thought to follow a latitudinal gradient with high phenolic species in high latitudes and low phenolic species in low latitudes. However, tropical brown algae from the western Caribbean have been shown to be high in phlorotannin concentration, indicating that latitude alone is...

journal_title：Oecologia

authors： Targett NM,Boettcher AA,Targett TE,Vrolijk NH

更新日期：1995-08-01 00:00:00

abstract：:Long-term studies were carried out in central Finland between 1985 and 2003 to examine the temporal and spatial variation in the density of otter populations. Snow tracking was used to estimate the total population and the number of litters in the study area. In total 52 otters, including 16 cubs in 11 litters, lived ...

journal_title：Oecologia

authors： Sulkava RT,Sulkava PO,Sulkava PE

更新日期：2007-09-01 00:00:00

abstract：:Most theoretical models for the evolution of temperature-dependent sex determination (TSD) rely upon differential fitness of male and female offspring incubated under different thermal regimes. However, there are few convincing data on this topic. We studied incubation effects in a lizard species (Bassiana duperreyi, ...

journal_title：Oecologia

authors： Elphick MJ,Shine R

更新日期：1999-03-01 00:00:00

abstract：:Climate change does affect not only average rainfall and temperature but also their variation, which can reduce the predictability of suitable conditions for growth and reproduction. This situation is problematic for inhabitants of temporary waters whose reproductive success depends on rainfall and evaporation that de...

journal_title：Oecologia

authors： Pinceel T,Vanschoenwinkel B,Hawinkel W,Tuytens K,Brendonck L

更新日期：2017-05-01 00:00:00

abstract：:Reptile ticks mate while females are attached to their host. Following mating, females engorge, detach and then lay their eggs. This study examines whether the time that females of the reptile tick Amblyomma limbatum spend on hosts prior to mating and the time they take to engorge on hosts after mating influence their...

journal_title：Oecologia

authors： Chilton NB,Andrews RH,Bull CM

更新日期：1993-05-01 00:00:00

abstract：:Experimental ponds were used as a model system of habitat patches to study the effect of habitat size on the relative growth performance of tadpoles of Bufo americanus and Pseudacris triseriata, and on colonization by predatory insects. Three pond depths and surface areas were habitat size treatments in a replicated, ...

journal_title：Oecologia

authors： Pearman PB

更新日期：1995-04-01 00:00:00

abstract：:In order to understand habitat selection, it is important to consider the way individual animals assess the suitability of a future reproductive site. One way of investigating mechanisms (such as those involved in nest site selection) is to examine breeding success and habitat characteristics in terms of animals retur...

journal_title：Oecologia

authors： Hoi H,Krištín A,Valera F,Hoi C

更新日期：2012-05-01 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

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：:The percent of species of the Cyperaceae possessing the C4 pathway was calculated for twenty-five regions of North America. A stepwise multiple regression analysis was used to determine which climatic variables were most highly correlated with the percent C4 species among the various regions. The square of the mean Ju...

journal_title：Oecologia

authors： Teeri JA,Livingstone DA

更新日期：1980-12-01 00:00:00

abstract：:Size-limited predation is an important process during the development of many aquatic species, and mortality rates of early larval stages and small individuals can be particularly high. Structurally complex habitats can mediate predator-prey interactions and provide a potentially important mechanism for decreasing pre...

journal_title：Oecologia

authors： Babbitt KJ,Tanner GW

更新日期：1998-04-01 00:00:00

abstract：:In order to determine the influence of the hydrogen-ion concentration on the damage exerted to lichens by sulfur dioxide gas, thalli of the species Hypogymnia physodes and Xanthoria parietina were submerged in buffer solutions of pH 2 to pH 8 and subsequently exposed to SO2 gas. Net photosynthesis was employed as a cr...

journal_title：Oecologia

authors： Türk R,Wirth V

更新日期：1975-12-01 00:00:00

abstract：:CO2 assimilation in relation to light intensity and the relationship between leaf nitrogen and phosphorus concentrations and CO2 assimilation in 14 species of ecologically important Zimbabwean trees were examined. Eight of the species are members of the Fabaceae (Leguminosae). In the majority of Zimbabwean climax wood...

journal_title：Oecologia

authors： Tuohy JM,Prior JA,Stewart GR

更新日期：1991-11-01 00:00:00

abstract：:This study investigates the demography and interspecific interactions of 6 Heterohyrax brucei and 4 Procavia johnstoni populations, which inhabited 6 kopjes (rock outcrops) in the Serengeti National Park, Tanzania over a period of 17 years. On three kopjes (H1, O2 and PH2) both species lived sympatrically, while on th...

journal_title：Oecologia

authors： Hoeck HN

更新日期：1989-05-01 00:00:00

abstract：:This study examines the oviposition response of a specialist weevil (Mogulones larvatus) to patches of its host, the noxious weed Paterson"s curse/salvation Jane (Echium plantagineum). We simultaneously examined the effect of patch size and plant density (and their interaction), on the recorded oviposition patterns. O...

journal_title：Oecologia

authors： Shea K,Smyth M,Sheppard A,Morton R,Chalimbaud J

更新日期：2000-09-01 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：: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：:The Yellow-bellied Glider, Petaurus australis, was observed to feed sporadically but extensively on eucalypt sap. Gliders extracted sap by making incisions into the bark with their procumbent lower incisor teeth and licking the resulting exudate. Less than 1% of possible trees were incised for sap. Sap flow and sap-su...

journal_title：Oecologia

authors： Goldingay RL

更新日期：1987-08-01 00:00:00

abstract：:The effect of invertebrate shredders on organic matter dynamics and phosphorus spiralling was studied over a 30-week period in laboratory streams. The streams were fed by groundwater, layered with cobble and gravel from a natural stream, covered with opaque material to eliminate algal growth, and initially contained 1...

journal_title：Oecologia

authors： Mulholland PJ,Elwood JW,Newbold JD,Ferren LA

更新日期：1985-05-01 00:00:00

abstract：:Cottonwoods are dominant riparian trees of the western United States and are known for their propensity to hybridize. We compared the decomposition of leaf litter from two species (Populus angustifolia and P. fremontii) and their hybrids. Three patterns were found. First, in one terrestrial and two aquatic experiments...

journal_title：Oecologia

authors： Driebe EM,Whitham TG

更新日期：2000-04-01 00:00:00

abstract：:Tree population size structures and dispersion patterns were studied using stem maps in three old-growth western hemlock (Tsuga heterophylla Sarg.)-western redcedar (Thuja plicata Donn.) stands in the Rocky Mountains of northern Idaho and adjacent Washington. The two species were codominant in one stand, hemlock domin...

journal_title：Oecologia

authors： Turner DP,Franz EH

更新日期：1985-12-01 00:00:00

abstract：:Nitrogen deposition in the northeastern US changed N availability in the latter part of the twentieth century, with potential legacy effects. However, long-term N cycle measurements are scarce. N isotopes in tree rings have been used as an indicator of N availability through time, but there is little verification of w...

journal_title：Oecologia

authors： Burnham MB,Adams MB,Peterjohn WT

更新日期：2019-12-01 00:00:00

abstract：:Lianas are an important component of tropical forests, contributing up to 25% of the woody stems and 35% of woody species diversity. Lianas invest less in structural support but more in leaves compared to trees of similar biomass. These physiological and morphological differences suggest that lianas may interact with ...

journal_title：Oecologia

authors： Wright A,Tobin M,Mangan S,Schnitzer SA

更新日期：2015-02-01 00:00:00

abstract：:The apparent energy of activation (E a), Michaelis-Menten constant (K mfor oxaloacetate), V max/K mratios and specific activities of NADP+-malate dehydrogenase (NADP+-MDH; EC 1.1.1.82) were analyzed in plants of Barnyard grass from Québec (QUE) and Mississippi (MISS) acclimated to two thermoperiods 28/22°C, 21/15°C, a...

journal_title：Oecologia

authors： Simon JP,Potvin C,Strain BR

更新日期：1989-10-01 00:00:00

abstract：:We compared the parasitoid communities associated with grass-feeding herbivores in Germany and Britain to examine geographical consistency in community composition and to test ecological characteristics of the plants and host insects that may explain variability in parasitoid community structure. The parasitoid commun...

journal_title：Oecologia

authors： Tscharntke T,Vidal S,Hawkins BA

更新日期：2001-11-01 00:00:00

abstract：:1.) The daily ration required to maintain a population growth rate, r m, of zero (threshold ration) increased with increasing Asplanchna body mass. This relationship is described by the equation T=0.342 W0.797 where T=threshold ration (μg day-1 dry mass) and W=Asplanchna body mass (μg adult-1 dry mass). 2.) The thresh...

journal_title：Oecologia

authors： Stemberger RS,Gilbert JJ

更新日期：1984-11-01 00:00:00

abstract：:The mass loss of litter mixtures is often different than expected based on the mass loss of the component species. We investigated if the identity of neighbour species affects these litter-mixing effects. To achieve this, we compared decomposition rates in monoculture and in all possible two-species combinations of ei...

journal_title：Oecologia

authors： Hoorens B,Coomes D,Aerts R

更新日期：2010-02-01 00:00:00

abstract：:No definitive explanation for the form of the relationship between species diversity and ecosystem productivity exists nor is there agreement on the mechanisms linking diversity and productivity across scales. Here, we examine changes in the form of the diversity-productivity relationship within and across the plant c...

journal_title：Oecologia

authors： Jennings MD,Williams JW,Stromberg MR

更新日期：2005-05-01 00:00:00

abstract：:Chronic atmospheric N deposition has modified relative N availability, altering the biogeochemical cycles of forests and the stoichiometry of nutrients in trees, inducing P limitation, and modifying the N:P ratios of plant biomass. This study examines how the variation in the foliar stoichiometry of Abies pinsapo acro...

journal_title：Oecologia

authors： Blanes MC,Viñegla B,Merino J,Carreira JA

更新日期：2013-04-01 00:00:00