The influence of pollen addition and ramet isolation on current sexual reproduction in a clonal herb.

abstract：:Temperature is a powerful correlate of large-scale terrestrial and marine diversity patterns but the mechanistic links remain unclear. Whilst many explanations have been proposed, quantitative predictions that allow them to be tested statistically are often lacking. As an important exception, the metabolic theory of e...

journal_title：Oecologia

authors： Rombouts I,Beaugrand G,Ibaňez F,Chiba S,Legendre L

更新日期：2011-06-01 00:00:00

abstract：:Ecosystem-wide effects of introduced brown trout (Salmo trutta L.) and native river galaxias (Galaxiaseldoni McDowall) were studied by analysing ecosystem production budgets for two adjacent tributaries of a grassland stream-system in the South Island of New Zealand. One tributary was inhabited by brown trout, the oth...

journal_title：Oecologia

authors： Huryn AD

更新日期：1998-06-01 00:00:00

abstract：:To preserve biodiversity and ecosystem functions in a globally changing world it is crucial to understand the effect of land use on ecosystem processes such as pollination. Floral colouration is known to be central in plant-pollinator interactions. To date, it is still unknown whether land use affects the colouration ...

journal_title：Oecologia

authors： Binkenstein J,Renoult JP,Schaefer HM

更新日期：2013-10-01 00:00:00

abstract：:Controls of fine dynamics were investigated in a Pinus palustris Mill. (longleaf pine) woodland subjected to two understory vegetation treatments (control versus removed) and four overstory treatments (no gap control, and canopy gaps of three sizes with constant total gap area per stand). Fine root (<2 mm diameter) dy...

journal_title：Oecologia

authors： Jones RH,Mitchell RJ,Stevens G,Pecot S

更新日期：2003-01-01 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 isopod Sphaeroma terebrans, which bores into the prop roots of the red mangrove, Rhizophora mangle, can cause death and subsequent breakage of the inhabited root and, debatably, may reduce the support system of the tree. We examined whether different characteristics of a root or its physical setting, both of which...

journal_title：Oecologia

authors： Brooks AR,Bell SS

更新日期：2001-05-01 00:00:00

abstract：:The neotropical shrub Pentagonia macrophylla Benth. (Rubiaceae) has protandrous two-day flowers. Synchronous development among flowers on a single individual results in sequential phenotypic unisexuality: the entire plant alternates gender from day to day. Pistillate flowers produce more nectar than staminate flowers ...

journal_title：Oecologia

authors： McDade LA

更新日期：1986-01-01 00:00:00

abstract：:Parasites can generate complex life history trade-offs in a host. In this study, we experimentally reduced the infection level of intestinal helminth parasites in the Taiwan field mouse (Apodemus semotus) to test (1) whether parasite richness and load are biased towards male or female mice (sex-biased parasitism) and ...

journal_title：Oecologia

authors： Lo HY,Shaner PL

更新日期：2015-03-01 00:00:00

abstract：:Alpine Trifolium species have high rates of symbiotic N2-fixation which may influence the abundance and growth of plant species growing near them. The potential for facilitative effects on plant abundance and growth in dry meadow alpine tundra of Niwot Ridge, Colo., characterized by low resource availability, was inve...

journal_title：Oecologia

authors： Thomas BD,Bowman WD

更新日期：1998-06-01 00:00:00

abstract：:From 1997 to 1999, we monitored the reproductive success of individual rufous-crowned sparrows (Aimophila ruficeps) in coastal sage scrub habitat of southern California, USA. Annual reproductive output of this ground-nesting species varied strongly with annual variation in rainfall, attributed to the El Niño-Southern ...

journal_title：Oecologia

authors： Morrison SA,Bolger DT

更新日期：2002-11-01 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：: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：:We studied behavioral mechanisms underlying the spatial distribution of Euphydryas anicia (Lepidoptera: Nymphalidae) females searching for larval host plants on a flat plain in Colorado. The rate of female movement, as represented by an empirically estimated diffusion coefficient, is affected by two factors. First, wh...

journal_title：Oecologia

authors： Odendaal FJ,Turchin P,Stermitz FR

更新日期：1989-02-01 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：:In order to monitor the nitrate assimilation capability of mire plants, in vivo current and maximally induced nitrate reductase activity (NRA) were investigated in 14 species of vascular plants from four different sites in a central Swedish mire. One of the sites was a swamp forest. The plants studied included species...

journal_title：Oecologia

authors： Högbom L,Ohlson M

更新日期：1991-09-01 00:00:00

abstract：:Leaf surface conductance and apparent photosynthesis were measured during late summer and autumn on saplings and sprouts of pin cherry (Prunus pensylvanica), yellow birch (Betula alleghaniensis), American beech (Fagus grandifolia), and sugar maple (Acer saccharum) naturally revegetating a site in the northern hardwood...

journal_title：Oecologia

authors： Amthor JS,Gill DS,Bormann FH

更新日期：1990-08-01 00:00:00

abstract：:Global climate models forecast an increase in the frequency and intensity of extreme weather events, including severe droughts. Based on multi-year relationships between precipitation amount and aboveground annual net primary production (ANPP), semi-arid grasslands are projected to be among the most sensitive ecosyste...

journal_title：Oecologia

authors： Cherwin K,Knapp A

更新日期：2012-07-01 00:00:00

abstract：:Urbanization is a major challenge for biodiversity conservation, yet the evolutionary processes taking place in urbanized areas remain poorly known. Human activities in cities set new selective forces in motion which need to be investigated to predict the evolutionary responses of animal species living in urban areas....

journal_title：Oecologia

authors： Jacquin L,Récapet C,Prévot-Julliard AC,Leboucher G,Lenouvel P,Erin N,Corbel H,Frantz A,Gasparini J

更新日期：2013-11-01 00:00:00

abstract：:In arctic tundra soil, oxygen depletion associated with soil flooding may control plant growth either directly through anoxia or indirectly through effects on nutrient availability. This study was designed to evaluate whether plant growth and physiology of two arctic sedge species are more strongly controlled by the d...

journal_title：Oecologia

authors： Gebauer RL,Reynolds JF,Tenhunen JD

更新日期：1995-11-01 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 response to a single defoliation was studied on three clones of Themeda triandra collected in the short, mid, and tall grassland regions of the Serengeti National Park (Tanzania). These sites represent a gradient of decreasing grazing intensity. Growth, allocation pattern, and several morphometric traits were moni...

journal_title：Oecologia

authors： Oesterheld M,McNaughton SJ

更新日期：1988-11-01 00:00:00

abstract：:Rodents of the family Heteromyidae are proficient gatherers and hoarders of seeds. A major component of their adaptive specialization for harvesting and transporting seeds is their spacious, fur-lined cheek pouches. Precise measurements of cheek pouch capacities are essential if ecologists are to understand the foragi...

journal_title：Oecologia

authors： Vander Wall SB,Longland WS,Pyare S,Veech JA

更新日期：1997-12-01 00:00:00

abstract：:The amount of calcium in Eucalyptus diversicolor (karri) ecosystems is high in comparison with other eucalypt forest ecosystems in Australia. A large proportion of this calcium is present as crystalline Ca oxalate. Whewellite (CaC2O4·H2O) accumulates in leaf tissue of the over- and understorey species. Up to 70% of th...

journal_title：Oecologia

authors： O'Connell AM,Malajczuk N,Gailitis V

更新日期：1983-02-01 00:00:00

abstract：:Among 13 tropical tree species on Barro Colorado Island, species with high seedling mortality rates during the first year in shade had higher reltive growth rates (RGR) from germination to 2 months in both sun (23% full sun) and shade [2%, with and without lowered red: far red (R:FR) ratio] than shade tolerant species...

journal_title：Oecologia

authors： Kitajima K

更新日期：1994-08-01 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 used a combination of laboratory experiments and field surveys to examine the role that population-specific predation risk may play in shaping the life history strategy of a stream-dwelling isopod Lirceus fontinalis. Two focal populations were identified that were exposed to different predator types. The first popul...

journal_title：Oecologia

authors： Sparkes TC

更新日期：1996-04-01 00:00:00

abstract：:A central point in life history theory is that parental investment in current reproduction should be balanced by the costs in terms of residual reproductive value. Long-lived seabirds are considered fixed investors, that is, parents fix a specific level of investment in their current reproduction independent to the br...

journal_title：Oecologia

authors： Navarro J,González-Solís J

更新日期：2007-02-01 00:00:00

abstract：:We determined the water-soluble thiol (SH) content and the osmolality of the cell sap in spruce trees of both low- and high-altitude origin that were transplanted to two test areas at different altitudes (400 m and 1700 m). There was little or no significant difference in SH content and osmotic value between trees of ...

journal_title：Oecologia

authors： Grill D,Pfeifhofer H,Tschulik A,Hellig K,Holzer K

更新日期：1988-07-01 00:00:00

abstract：:Variation in body size (weight) is examined across the order Carnivora in relation to taxonomy (phylogeny), latitude, habitat, zonation, activity cycle, diet, prey size, and prey diversity. Significant differences in body weight are observed with respect to family membership. Some of these differences may be explained...

journal_title：Oecologia

authors： Gittleman JL

更新日期：1985-12-01 00:00:00

abstract：:The decomposition (meaning disappearance) of different leaf types and artificial leaves made from cellulose hydrate foil was studied in three forests - an alluvial forest (Ulmetum), a beech forest on limestone soil (Melico-Fagetum), and a spruce forest in soil overlying limestone bedrock.Fine, medium, and coarse mesh ...

journal_title：Oecologia

authors： Herlitzius H

更新日期：1983-03-01 00:00:00