The effects of stem girdling on biogeochemical cycles within a mixed deciduous forest in eastern Tennessee : II. Soil nitrogen mineralization and nitrification rates.

abstract：:It has been suggested that a heterogeneous environment enhances species richness and allows for the coexistence of species. However, there is increasing evidence that environmental heterogeneity can have no effect or even a negative effect on plant species richness and plant coexistence at a local scale. We examined w...

journal_title：Oecologia

authors： Douda J,Doudová-Kochánková J,Boublík K,Drašnarová A

更新日期：2012-06-01 00:00:00

abstract：:We used a laboratory assay to partition the effects of predation and intraspecific competition on the establishment, mating success, and brood development of an endophytic herbivore. We selected a system in which the same predator feeds both exophytically and endophytically on the same prey, to evaluate the role of he...

journal_title：Oecologia

authors： Aukema BH,Raffa KF

更新日期：2002-12-01 00:00:00

abstract：:Folivory results in both leaf damage and the loss of photosynthetic capacity. Leaf damage activates the production of induced defenses, but diminished photosynthetic capacity resulting from lost leaf area may impair a plant's ability to respond defensively. Because damage-induced nicotine production in Nicotiana sylve...

journal_title：Oecologia

authors： Baldwin IT,Schmelz EA

更新日期：1994-04-01 00:00:00

abstract：:Understanding climatic controls on tropical forest productivity is key to developing more reliable models for predicting how tropical biomes may respond to climate change. Currently there is no consensus on which factors control seasonal changes in tropical forest tree growth. This study reports the first comprehensiv...

journal_title：Oecologia

authors： Rowland L,Malhi Y,Silva-Espejo JE,Farfán-Amézquita F,Halladay K,Doughty CE,Meir P,Phillips OL

更新日期：2014-01-01 00:00:00

abstract：:The chaparral shrub Eriodictyon californicum secretes a phenolic leaf resin composed of flavonoid aglycones. We used leaves with artificially altered resin contents to test the effects of resin on the feeding, growth, and oviposition of the specialist herbivore Trirhabda diducta. In addition, we compared Trirhabda fee...

journal_title：Oecologia

authors： Johnson ND,Brain SA,Ehrlich PR

更新日期：1985-04-01 00:00:00

abstract：:Although ontogenetic changes in the carbon isotope ratios of marine fauna have been well studied those of freshwater organisms have not. As a result, we may have a less than adequate assessment of the incorporation of allochthonous detritus into freshwater foodwebs. This study found a δ13C range of 9‰ for crayfish (Or...

journal_title：Oecologia

authors： France R

更新日期：1996-07-01 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：:In the present study we investigated the economics of load transport in the grass-cutting ant Atta vollenweideri by focusing on the effects of load mass, width and length on individual transport rates. Both running speed of foragers and the amount of material transported a given distance per unit time, i.e. gross mate...

journal_title：Oecologia

authors： Röschard J,Roces F

更新日期：2002-04-01 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：:The competitive interactions between roach (Rutilus rutilus) and rudd (Scardinius erythrophthalmus) were investigated in two habitats, the open water and the waterlily zone. The growth rates of both species in enclosures were lower when confined together than when alone, demonstrating interspecific competition. Allopa...

journal_title：Oecologia

authors： Johansson L

更新日期：1987-08-01 00:00:00

abstract：:Life history theory and empirical studies suggest that large size or earlier metamorphosis are suitable proxies for increased lifetime fitness. Thus, across a gradient of larval habitat quality, individuals with similar phenotypes for these traits should exhibit similar post-metamorphic performance. Here we examine th...

journal_title：Oecologia

authors： Van Allen BG,Briggs VS,McCoy MW,Vonesh JR

更新日期：2010-12-01 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：:Nitrogen (N2) fixation was estimated along an aridity gradient in Namibia from the natural abundance of 15N (δ15N value) in 11 woody species of the Mimosacease which were compared with the δ15N values in 11 woody non-Mimosaceae. Averaging all species and habitats the calculated contribution of N2 fixation (N f ) to le...

journal_title：Oecologia

authors： Schulze ED,Gebauer G,Ziegler H,Lange OL

更新日期：1991-11-01 00:00:00

abstract：:Measurements are reported of carbon isotope ratios of Dudleya species growing in natural plant communities. Considerable variation in the δ13C values are interpreted as indicating substantial flexibility of the photosynthetic pathways between C3 and CAM. The variability in photosynthetic pathway was in response to gen...

journal_title：Oecologia

authors： Troughton JH,Mooney HA,Berry JA,Verity D

更新日期：1977-12-01 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：:Fruiting phenology and pattern of fruit removal of two shrubby dogwoods were examined in relation to fruit composition. It was predicted that fruit of the species bearing high fat fruit would disappear more rapidly and fall to the ground sooner than fruit of the species bearing low fat fruit. Field observation at two ...

journal_title：Oecologia

authors： Borowicz VA,Stephenson AG

更新日期：1985-10-01 00:00:00

abstract：:CO2 assimilation rate (A) and leaf conductance (g) were measured in the field on intact branches of 35-year-old Picea abies (L.) Karst. trees, in five plots each in a healthy and a declining stand. The declining site included trees with yellow needles. In order to separate atmospheric effects on gas exchange from effe...

journal_title：Oecologia

authors： Zimmermann R,Oren R,Schulze E-,Werk KS

更新日期：1988-09-01 00:00:00

abstract：:Holling's (1992) proposition that discontinuities in biotic and abiotic processes generate structure in ecological systems is examined experimentally by imposing size-specific perturbations on marine sediment assemblages. Two kinds of perturbations were applied: organic enrichment and predation, each at two levels. Pe...

journal_title：Oecologia

authors： Raffaelli D,Hall S,Emes C,Manly B

更新日期：2000-02-01 00:00:00

abstract：:The optimal strategy in the design of nature reserves is investigated by means of the theory of island biogeography. Some previous results are revised. A new form of the incidence functions is presented. Their merit is that they do not ignore the minimum area requirements, they are more flexible, and in a number of in...

journal_title：Oecologia

authors： Kindlmann P

更新日期：1983-08-01 00:00:00

abstract：:Behavioral traits and diet were traditionally thought to be highly plastic within individuals. This view was espoused in the widespread use of optimality models, which broadly predict that individuals can modify behavioral traits and diet across ecological contexts to maximize fitness. Yet, research conducted over the...

journal_title：Oecologia

authors： Toscano BJ,Gownaris NJ,Heerhartz SM,Monaco CJ

更新日期：2016-09-01 00:00:00

abstract：:Plasticity in life history strategies can be advantageous for species that occupy spatially or temporally variable environments. We examined how phenotypic plasticity influences responses of the mole salamander, Ambystoma talpoideum, to disturbance events at the St. Marks National Wildlife Refuge (SMNWR), FL, USA from...

journal_title：Oecologia

authors： Davis CL,Miller DA,Walls SC,Barichivich WJ,Riley J,Brown ME

更新日期：2017-03-01 00:00:00

abstract：:Blue oak (Quercus douglasii) is a deciduous tree species endemic to California that currently exhibits poor seedling survival to sapling age classes. We used common garden techniques to examine how genetic variation at regional and local scales affected phenotypic expression in traits affecting oak seedling growth and...

journal_title：Oecologia

authors： Rice KJ,Gordon DR,Hardison JL,Welker JM

更新日期：1993-12-01 00:00:00

abstract：:To establish a general model for the removal rate of periphyton by grazers, we identified 27 publications in which removal rates could be estimated from grazer enclosure or exclosure experiments. When all the measurements obtained under different experimental conditions were extracted, these publications provided 107 ...

journal_title：Oecologia

authors： Cattaneo A,Mousseau B

更新日期：1995-08-01 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：:Contamination in marine foodwebs is nowadays of great environmental concern owing to the increasing levels of pollution in marine ecosystems from different anthropogenic sources. Seabirds can be used as indicators of regional contaminant patterns across large temporal and spatial scales. We analysed Hg, Se and Pb leve...

journal_title：Oecologia

authors： Ramos R,González-Solís J,Forero MG,Moreno R,Gómez-Díaz E,Ruiz X,Hobson KA

更新日期：2009-03-01 00:00:00

abstract：:Four brook-dwelling populations of Ancylus fluviatilis were studied. Data on life-cycle, specimen number, biomass and egg capsule biomass are reported. By means of experimental data on ingestion, assimilation, growth and egg-production, energy balances are calculated for whole populations.Mean annual biomass turned ou...

journal_title：Oecologia

authors： Streit B

更新日期：1976-09-01 00:00:00

abstract：:The effects of competitive suppression by vines on the non-vine plant community have received little attention in temperate habitats. This study investigated the impact vines have on their herbaceous hosts in a wetland community at two soil fertility levels. Plots in an oligohaline marsh were treated in a 2 × 2 factor...

journal_title：Oecologia

authors： Gough L,Grace JB

更新日期：1997-10-01 00:00:00

abstract：:The hypothesis that cooperative breeding entails a cost in terms of transmission of ectoparasites was tested by a comparative analysis among sympatric Australian passerines. The general trend found using the allometry method and outgroup analysis indicates that contagious ectoparasites are not more common on cooperati...

journal_title：Oecologia

authors： Poiani A

更新日期：1992-12-01 00:00:00

abstract：:To evaluate the general extent to which sex-related differences in palatability occur in boreal dioecious woody plants, males and females of five dioecious woody plant species were presented to free-ranging mountain hares (Lepus timidus) during winter. Hares strongly preferred branches from male plants when feeding on...

journal_title：Oecologia

authors： Hjältén J

更新日期：1992-02-01 00:00:00

abstract：:Phytoplankton abundance in tropical lakes is more often judged to be limited by nitrogen than phosphorus, but seldom does the evidence include controlled enrichments of natural populations. In January 1980 we performed the first experimental fertilization in an equatorial African soda lake, Lake Sonachi, a small, mero...

journal_title：Oecologia

authors： Melack JM,Kilham P,Fisher TR

更新日期：1982-01-01 00:00:00