Food-web modification by an invertebrate predator in the Great Salt Lake (USA).

abstract：:A large number of herbaceous and woody plants from tropical woodland, savanna, and monsoon forest were analysed to determine the impact of environmental factors (nutrient and water availability, fire) and biological factors (microbial associations, systematics) on plant delta(15)N values. Foliar delta(15)N values of h...

journal_title：Oecologia

authors： Schmidt S,Stewart GR

更新日期：2003-03-01 00:00:00

abstract：:Nutrient availability and herbivory can regulate primary production in ecosystems, but little is known about how, or whether, they may interact with one another. Here, we investigate how nitrogen availability and insect herbivory interact to alter aboveground and belowground plant community biomass in an old-field eco...

journal_title：Oecologia

authors： Blue JD,Souza L,Classen AT,Schweitzer JA,Sanders NJ

更新日期：2011-11-01 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：:Experiments are described which test the hypothesis that more host-specific species of caterpillars should be less aceptable to a generalist predator than polyphagous species. Caterpillars of all species were tested in paired choice tests with the Argentine ant, Iridomyrmex humilis. Experiments were replicated ten tim...

journal_title：Oecologia

authors： Bernays EA,Cornelius ML

更新日期：1989-05-01 00:00:00

abstract：:Aggregations of different-looking animals are frequently seen in nature, despite well-documented selection pressures on individuals to maintain phenotypically homogenous groups. Two well-known theories, the 'confusion effect' (reduced ability of a predator to accurately target an individual in a group) and the 'oddity...

journal_title：Oecologia

authors： Rodgers GM,Kimbell H,Morrell LJ

更新日期：2013-05-01 00:00:00

abstract：:Evaluation of size-dependent variation in statoblast numbers in Plumatella repens indicates that this freshwater bryozoan employs divergent strategies in dispersing its asexual offspring in space and time. While the numbers of sessoblasts which were cemented to local substrates did not vary per unit ramet size, number...

journal_title：Oecologia

authors： Karlson RH

更新日期：1992-03-01 00:00:00

abstract：:Fluctuations in the abundance of main prey species might shape animal communities, by inducing numerical responses and dietary shifts in predators. Whether numerical responses and dietary shifts differ among individuals of different age and sex has so far gained little attention. These differences could affect how muc...

journal_title：Oecologia

authors： Masoero G,Laaksonen T,Morosinotto C,Korpimäki E

更新日期：2020-03-01 00:00:00

abstract：:Changes to the radiative environment arising from stratospheric ozone (O(3)) depletion and subsequent associations between these changes and the pigmentation of the moss Andreaea regularis were measured in late austral spring and early summer 1998 at Rothera Point on the western Antarctic Peninsula (67 degrees S, 68 d...

journal_title：Oecologia

authors： Newsham KK

更新日期：2003-05-01 00:00:00

abstract：:Carbon allocation among bunchgrass tillers was examined with carbon-11 (11CO2) steady state labelling. Labelled carbon was continuously transported from parent tillers to anatomically attached daughter tillers at a time when morphological characteristics indicated that tiller maturation had occurred. Steady state leve...

journal_title：Oecologia

authors： Welker JM,Rykiel EJ Jr,Briske DD,Goeschl JD

更新日期：1985-09-01 00:00:00

abstract：:Because of a hard seed coat, entirely preventing absorption of water in desert species ofSida, germination is rendered impossible or difficult under laboratry conditions. This block was eliminated by high temperature pretreatments to ensure better germination. The seeds could tolerate extremely high temperatures for s...

journal_title：Oecologia

authors： Chawan DD

更新日期：1971-12-01 00:00:00

abstract：:Freezing tolerance as a cold resistance mechanism is described for the first time in a plant growing in the tropical range of the Andean high mountains. Draba chionophila, the plant in which freezing tolerance was found, is the vascular plant which reaches the highest altitudes in the Venezuelan Andes (approximately 4...

journal_title：Oecologia

authors： Azocar A,Rada F,Goldstein G

更新日期：1988-02-01 00:00:00

abstract：:Otolith microchemistry studies indicate that growth-phase (yellow stage) anguillid eels commonly shift at irregular intervals between fresh and saline waters, but this technique has not detected regular seasonal migrations across salinity zones. We tested the ability of otolith microchemistry and stable isotope analys...

journal_title：Oecologia

authors： Clément M,Chiasson AG,Veinott G,Cairns DK

更新日期：2014-08-01 00:00:00

abstract：:Mature growth-phase internodes of Alaska paper birch (Betula resinifera) are preferred by the snowshoe hare (Lepus americanus) over juvenile growth-phase internodes due to the low food value of the latter. While the mature over juvenile preferencec cannot be explained by the levels of inorganic nutrients or gross chem...

journal_title：Oecologia

authors： Reichardt PB,Bryant JP,Clausen TP,Wieland GD

更新日期：1984-12-01 00:00:00

abstract：:Northern hemispheric background concentrations of ozone are increasing, but few studies have assessed the ecological significance of these changes for grasslands of high conservation value under field conditions. We carried out a 3-year field experiment in which ozone was released at a controlled rate over three exper...

journal_title：Oecologia

authors： Wedlich KV,Rintoul N,Peacock S,Cape JN,Coyle M,Toet S,Barnes J,Ashmore M

更新日期：2012-04-01 00:00:00

abstract：:Non-trophic interactions, driven by one species changing the behavior but not density of another species, appear to be as pervasive as those involving consumption. However, ecologists have only begun to explore non-trophic interactions in species-rich communities. We investigated interactions within a community includ...

journal_title：Oecologia

authors： Prasad RP,Snyder WE

更新日期：2010-03-01 00:00:00

abstract：:Data in the literature that in the Netherlands Carabus problematicus is an autumn breeder with overwintering larvae and adults have been confirmed. Pitfall catches show two peaks of adult beetles. The first small peak of activity is realized in May, the significance of which is not yet understood. The second higher pe...

journal_title：Oecologia

authors： Rijnsdorp AD

更新日期：1980-05-01 00:00:00

abstract：:Small changes in environmental conditions can unexpectedly tip an ecosystem from one community type to another, and these often irreversible shifts have been observed in semi-arid grasslands, freshwater lakes and ponds, coral reefs, and kelp forests. A commonly accepted explanation is that these ecosystems contain mul...

journal_title：Oecologia

authors： Petraitis PS,Methratta ET,Rhile EC,Vidargas NA,Dudgeon SR

更新日期：2009-08-01 00:00:00

abstract：:Gene frequencies at nine polymorphic enzyme loci were followed in 22 cage populations of D. melanogaster all founded from the same stock but subsequently maintained in different environments. The three factors distinguishing the different environments were temperature and the alcohol and yeast in the medium and for ea...

journal_title：Oecologia

authors： Oakeshott JG

更新日期：1979-12-01 00:00:00

abstract：:Many bumblebee species are declining at a rapid rate in the United Kingdom and elsewhere. This is commonly attributed to the decline in floral resources that has resulted from an intensification in farming practices. Here we assess growth of nests of the bumblebee, Bombus terrestris, in habitats providing different le...

journal_title：Oecologia

authors： Goulson D,Hughes W,Derwent L,Stout J

更新日期：2002-01-01 00:00:00

abstract：:Declines in density of one natural, three artificially-seeded and eight experimental populations of Anadara granosa were monitored over periods ranging from seven to twelve months. For three of four large populations the decline in density has been adequately described by a model of the form N t=N 0·e zt where N t is ...

journal_title：Oecologia

authors： Broom MJ

更新日期：1983-06-01 00:00:00

abstract：:Facultative diapause should be favoured by natural selection in temporary variable habitats. Diapause patterns are evolutionary constrained because producing diapause is resource demanding, which might have implications for competitive dynamics and competitor coexistence through mechanisms such as the storage effect. ...

journal_title：Oecologia

authors： Aránguiz-Acuña A,Ramos-Jiliberto R,Serra M

更新日期：2015-01-01 00:00:00

abstract：:Several mistletoe species are able to grow and reproduce on both deciduous and evergreen hosts, suggesting a degree of plasticity in their ability to cope with differences in intrinsic host functions. The aim of this study was to investigate the influence of host phenology on mistletoe water relations and leaf gas exc...

journal_title：Oecologia

authors： Scalon MC,Rossatto DR,Domingos FM,Franco AC

更新日期：2016-04-01 00:00:00

abstract：:The effects on plant growth and stomatal physiology of alterations in light quantity and quality during development were investigated in the C3 monocot, Commelina communis. Reduction in light intensity resulted in decreased branching and stem elongation, with effects more severe under "neutral shade" (R:FR≥1.0) than u...

journal_title：Oecologia

authors： Assmann SM

更新日期：1992-11-01 00:00:00

abstract：: Fluorogenic substrate analogues (MUF substrates) are very sensitive in detecting hydrolytic enzymes. This method was adapted for the quantitative analysis of extracellular enzymes in snails and other animals. It was then used to determine cellobiase, chitobiase, protease, esterase, phosphatase and lipase in the diges...

journal_title：Oecologia

authors： Brendelberger H

更新日期：1996-12-01 00:00:00

abstract：:Computer simulations of a pollinator foraging in a mixture of two species were used to explore how plant reproduction can be influenced by interspecific pollination movements. Interspecific pollen transfer led to strong competitive effects when availabilities of pollen, receptive stigma surfaces, or pollinator movemen...

journal_title：Oecologia

authors： Waser NM

更新日期：1978-01-01 00:00:00

abstract：:(i) The growth of ca. 100 individuals of a small deciduous tree Euphorbia pyrifolia, of different ages and edaphic regimes, and with different levels of infestation by the coccid Icerya seychellarum, has been studied on Aldabra Atoll over two years (1976-1978). Infestation on leaves ranged between 0 and 1.3 mg dry wei...

journal_title：Oecologia

authors： Newbery DM

更新日期：1980-01-01 00:00:00

abstract：:This study links summer foraging and scatter-hoarding to winter larder-hoarding and winter survival in yellow pine chipmunks (Tamias amoenus) by comparing patterns of time allocation and winter larder contents in 2 years with very different levels of resource availability. In 2003, seed production and the number of tr...

journal_title：Oecologia

authors： Kuhn KM,Vander Wall SB

更新日期：2008-08-01 00:00:00

abstract：:Forest destruction and disturbance can have long-term consequences for species diversity and ecosystem processes such as seed dispersal. Understanding these consequences is a crucial component of conserving vulnerable ecosystems. In the heavily fragmented and disturbed Kakamega Forest, western Kenya, we studied seed d...

journal_title：Oecologia

authors： Farwig N,Böhning-Gaese K,Bleher B

更新日期：2006-03-01 00:00:00

abstract：:Ten populations of the perennial herb, Liatris acidota Engelm. & Gray (Compositae), growing on the Texas Gulf Coast (USA) were analyzed for age structure, frequency of predation, and frequency of asexual reproduction. Nine of the ten populations exhibited non-stable age distributions due to a deficiency of young non-s...

journal_title：Oecologia

authors： Schaal BA

更新日期：1978-01-01 00:00:00

abstract：:The purpose of this research was to investigate the influence of nitrogen availability on growth and the patterns of dry matter and nitrogen allocation of the dune grasses Ammophila arenaria and Elymus mollis. Plants were grown from rhizome segments under near-ambient coastal conditions and received either high or low...

journal_title：Oecologia

authors： Pavlik BM

更新日期：1983-03-01 00:00:00