Differences in carbon and nutrient fractions among arctic growth forms.

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：:Global biodiversity is threatened by multiple anthropogenic stressors but little is known about the combined effects of environmental warming and invasive species on ecosystem functioning. We quantified thermal preferences and then compared leaf-litter processing rates at eight different temperatures (5.0-22.5 °C) by ...

journal_title：Oecologia

authors： Kenna D,Fincham WN,Dunn AM,Brown LE,Hassall C

更新日期：2017-03-01 00:00:00

abstract：:Global changes interact with plant invasions by differentially impacting native and invasive species. For example, invasive plants often benefit from eutrophication to a greater degree than native plants. While this is well-documented, a broad, trait-based explanation for this phenomenon is lacking. Recent research sh...

journal_title：Oecologia

authors： Harvey JT,Leffler AJ

更新日期：2020-08-01 00:00:00

abstract：:The effect of the community composition of soil microbes on ecosystem processes has received relatively little attention. Here we examined the variation in soil microbial composition in a Yellowstone National Park grassland and the effect of that variation on the growth, in a greenhouse, of the dominant grass in the c...

journal_title：Oecologia

authors： Frank DA,Gehring CA,Machut L,Phillips M

更新日期：2003-12-01 00:00:00

abstract：:Caterpillars of Maculinea arion are obligate predators of the brood of Myrmica sabuleti ants. In the aboratory, caterpillars eat the largest available ant larvae, although eggs, small larvae and prepupae are also palatable. This is an efficient way to predate. It ensures that newly-adopted caterpillars consume the fin...

journal_title：Oecologia

authors： Thomas JA,Wardlaw JC

更新日期：1992-08-01 00:00:00

abstract：:I tested hypotheses for ecological roles of storage carbohydrates in perennating organs (roots and branches) of alpine Oxytropis sericea, a leguminous herb. In naturally growing plants, total nonstructural carbohydrates achieved their maximal concentration in the fall, declined during winter, and reached minimal level...

journal_title：Oecologia

authors： Wyka T

更新日期：1999-08-01 00:00:00

abstract：:Leslie matrices are used to compare theoretical populations of gregarious and solitarious Desert Locusts, Schistocerca gregaria (Forsk.). Despite their lower fecundity, the synchrony and faster maturation of gregarious populations permit them to have much faster rates of increase than solitarious populations. When rea...

journal_title：Oecologia

authors： Cheke RA

更新日期：1978-01-01 00:00:00

abstract：:Perennial species have evolved several strategies to survive fire, with resprouters and seeders forming two major categories. Gompholobium marginatum is a herbaceous seeder legume occurring in the Western Australian jarrah (Eucalyptus marginata) forest which since 1961 has been subjected to burns every sixth year. Suc...

journal_title：Oecologia

authors： Hansen A,Pate JS,Hansen AP

更新日期：1992-05-01 00:00:00

abstract：:The effects of notonectid-induced crests on growth and reproduction, and resource allocation to crest construction, moult losses and eggs of Daphnia carinata were measured. An attempt was made to elucidate the mechanisms of physiological costs of crest induction for this species. The crested morph of d. carinata reach...

journal_title：Oecologia

authors： Barry MJ

更新日期：1994-03-01 00:00:00

abstract：:The effects of defoliation of alder (Alnus glutinosa) on subsequent herbivory by alder leaf beetle (Agelastica alni) were studied in ten alder stands in northern Germany. At each site, one tree was manually defoliated (c. 20% of total foliage) to simulate herbivory. Subsequent damage by A. alni was assessed on ten ald...

journal_title：Oecologia

authors： Dolch R,Tscharntke T

更新日期：2000-12-01 00:00:00

abstract：:The effects of simulated goose grazing on Phleum pratense plants were tested in an Iceland hayfield during the spring goose staging period (19 April-11 May 1997). Plants in an area exclosed from the influence of grazing and the nutrient effects of goose faeces were subject to the removal of the youngest lamina once, t...

journal_title：Oecologia

authors： Fox AD,Kristiansen JN,Stroud DA,Boyd H

更新日期：1998-08-01 00:00:00

abstract：:C(4) plants are rare in cool climates, an ecological pattern attributable to their poor photosynthetic performance at low temperatures relative to C(3) species. However, some C(4) species are able to persist at high latitudes and high elevations, possibly due to the characteristics of the particular microsites they in...

journal_title：Oecologia

authors： Kubien DS,Sage RF

更新日期：2003-11-01 00:00:00

abstract：:Seasonal changes in the Crassulacean Acid Metabolism (CAM) activity and growth characteristics of Opuntia humifusa Raf. were examined under midwest climatic conditions. Twenty-four hour studies were done at monthly intervals for two years, with diurnal changes in transpiration, gas exchange, and titratable acidity mon...

journal_title：Oecologia

authors： Koch KE,Kennedy RA

更新日期：1980-01-01 00:00:00

abstract：:Although ecological disturbances can have a strong influence on pollinators through changes in habitat, virtually no studies have quantified how characteristics of wildfire influence the demography of essential pollinators. Nevertheless, evaluating this topic is critical for understanding how wildfire is linked to pol...

journal_title：Oecologia

authors： Galbraith SM,Cane JH,Rivers JW

更新日期：2021-01-03 00:00:00

abstract：:The number of tracheal gills in the larval Limnephilini varies according to oxygen conditions of the surrounding waters. High proportions of oxygen cause a significant decrease in the number of gills, whereas low oxygen concentrations retult in a significant increase in the number of gills. These morphological adapati...

journal_title：Oecologia

authors： Wichard W

更新日期：1974-06-01 00:00:00

abstract：:At Bakers Hill, differential winter mortality of juvenile slowgrowing Amphibolurus ornatus is correlated with the incidence of frosts (Bradshaw, 1971). The present study shows that the probability an individual will spend the night in a refuge that is safe from the lethal effect of a frost is directly related to the i...

journal_title：Oecologia

authors： Baverstock PR

更新日期：1978-01-01 00:00:00

abstract：:Aspects of the demography of Monhystera disjuncta were investigated at different temperatures (in agnotobiotic cultures) and in different feeding conditions (monoxenic cultures with different bacterial strains, and different densities in the feeding suspension with one strain). Embryonic development time, minimum gene...

journal_title：Oecologia

authors： Vranken G,Herman PM,Heip C

更新日期：1988-11-01 00:00:00

abstract：:Habitat selection, and its associated density and frequency-dependent evolution, has a profound influence on such vital phenomena as population regulation, species interactions, the assembly of ecological communities, and the origin and maintenance of biodiversity. Different strategies of habitat selection, and their ...

journal_title：Oecologia

authors： Morris DW

更新日期：2003-06-01 00:00:00

abstract：:Phenological synchrony between herbivorous insects and host plants is an important determinant of insect distribution and abundance. Non-native insects often experience novel climates, photoperiods, and host plants. How critical time periods of insect life cycles coincide with-or diverge from-phenological windows of h...

journal_title：Oecologia

authors： Ward SF,Moon RD,Herms DA,Aukema BH

更新日期：2019-08-01 00:00:00

abstract：: Black and white spruce (Picea mariana and P. glauca) exhibit a striking micro-geographic distribution pattern at the southern edge of the boreal forest. Black spruce grows in flooded nutrient-poor muskegs, while white spruce is found primarily on drier upland sites, and the two rarely form mixed stands. In an attempt...

journal_title：Oecologia

authors： Patterson TB,Guy RD,Dang QL

更新日期：1997-04-01 00:00:00

abstract：:Two atlantic voyages were made by the FS Meteor during which pollen and spores were collected from the air. In the course of 32 days the average pollen content was 29/100 m3 air, the average spore content came to 5x104/100 m3 air. Both voyages occurred in late autumn. On the trip from Hamburg to the Azores the spore c...

journal_title：Oecologia

authors： Stix E

更新日期：1975-09-01 00:00:00

abstract：:Spatial variation in biotic interactions and natural selection are fundamental parts of natural systems, and can be driven by differences in both trait distributions and the local environmental context of the interaction. Most studies of plant-animal interactions have been performed only in natural settings, making it...

journal_title：Oecologia

authors： König MA,Wiklund C,Ehrlén J

更新日期：2014-04-01 00:00:00

abstract：:Experimental studies were used to examine the mechanisms governing the distribution and abundance of two major patch types in unshaded reaches of Augusta Creek, Michigan (USA). One patch type is dominated by Cladophora glomerata, a macroalga potentially able to monopolize space, whereas the other type is comprised of ...

journal_title：Oecologia

authors： Hart DD

更新日期：1992-08-01 00:00:00

abstract：:Theoretical models about the benefits of philopatry predict that immigrant fitness can be higher, lower or similar to that of philopatrics depending on habitat heterogeneity, dispersal costs, distance between patches or population densities. In this study, we compared transience rates, local survival and recruitment a...

journal_title：Oecologia

authors： Oro D,Tavecchia G,Genovart M

更新日期：2011-04-01 00:00:00

abstract：:A series of seventeen plant extracts rich in phenolic materials, including condensed and hydrolysable tannins, have been subjected to a series of chemical analyses in an attempt to gather ecologically significant information about their structure. Procedures investigated were (i) the Folin-Denis and Hagerman and Butle...

journal_title：Oecologia

authors： Mole S,Waterman PG

更新日期：1987-04-01 00:00:00

abstract：:Most animals metamorphose, changing morphology, physiology, behavior and ecological interactions. Size- and habitat-dependent mortality risk is thought to affect the evolution and plastic expression of metamorphic timing, and high predation during the morphological transition is posited as a critical selective force s...

journal_title：Oecologia

authors： Touchon JC,Jiménez RR,Abinette SH,Vonesh JR,Warkentin KM

更新日期：2013-11-01 00:00:00

abstract：:The gas exchange characteristics under steadystate and transient light conditions were determined for a redwood forest understory herb Adenocaulon bicolor, that depends on use of sunflecks for a large fraction of its daily carbon gain. Measurements under steady-state conditions indicated that this species has photosyn...

journal_title：Oecologia

authors： Pfitsch WA,Pearcy RW

更新日期：1989-09-01 00:00:00

abstract：:We demonstrate that natural heat stress on wild larval Drosophila melanogaster results in severe developmental defects in >10% of eclosing adults, and that increased copy number of the gene encoding the major inducible heat shock protein of D. melanogaster, Hsp70, is sufficient to reduce the incidence of such abnormal...

journal_title：Oecologia

authors： Roberts SP,Feder ME

更新日期：1999-11-01 00:00:00

abstract：:Sources of variation in floral nectar production were investigated in a natural population of Epilobium canum (Onagraceae), a hummingbird-pollinated herbaceous shrub. Field measurements showed significant phenotypic variation among plants in floral nectar production rates. Average variance among flowers within plants ...

journal_title：Oecologia

authors： Boose DL

更新日期：1997-05-01 00:00:00

abstract：:In both single- and mixed-species social groups, certain participants are known to play important roles in providing benefits. Identifying these participants is critical for understanding group dynamics, but is often difficult with large roving social groups in the wild. Here, we develop a new approach to characterize...

journal_title：Oecologia

authors： Sridhar H,Shanker K

更新日期：2014-11-01 00:00:00