Spatial variation in infection by digenetic trematodes in a population of freshwater snails (Potamopyrgus antipodarum).

abstract：:Net photosynthetic rates for the lichen Parmelia praesignis Nyl. were obtained as a function of 5 light levels, 5 temperature levels, and of water content as thalli dried from saturated conditions. Data are described as second order polynomials in the light, and as saturation curves in the dark. Rates in the light wer...

journal_title：Oecologia

authors： Link SO,Nash TH 3rd

更新日期：1984-10-01 00:00:00

abstract：:The legume foodplants of Colias butterflies possess specific chemical components which stimulate oviposition in females of the genus. Different legumes provide different degrees of stimulation, as demonstrated by close correlation between field observations and laboratory experiments with a new behavioral assay. Sever...

journal_title：Oecologia

authors： Stanton ML

更新日期：1979-01-01 00:00:00

abstract：:Gas exchange characteristics in leaves of the sclerophyll shrub Quercus coccifera were studied in the natural habitat in Portugal during spring and during the summer dry period. Compared to other sclerophyll species growing at the same site, photosynthesis in leaves of Quercus coccifera was less affected by water stre...

journal_title：Oecologia

authors： Tenhunen JD,Lange OL,Harley PC,Beyschlag W,Meyer A

更新日期：1985-08-01 00:00:00

abstract：:Crucian carp (Carassius carassius) increases in body depth in response to chemical cues from piscivores and the deeper body constitutes a morphological defence against gape-limited piscivores. In the field, deep-bodied individuals suffer a density-dependent cost when competing with shallow-bodied conspecifics. Here, w...

journal_title：Oecologia

authors： Pettersson LB,Brönmark C

更新日期：1999-10-01 00:00:00

abstract：:To investigate the physiological, behavioral, and genetic contributions to growth rate, we studied the thermal sensitivity of growth rate in hatchlings of the iguanid lizards Sceloporus occidentalis and S. graciosus in the laboratory. We used a cycling thermal regime patterned after thermal environments found in natur...

journal_title：Oecologia

authors： Sinervo B,Adolph SC

更新日期：1989-03-01 00:00:00

abstract：:Transplants of white clover (Trifolium repens L.) were grown isolated from each other and in pairs placed at different distances apart. The paired plants developed asymmetrically and at the interface between paired clones both the density of nodes and of stolons appeared to reach ceiling values that were of the same o...

journal_title：Oecologia

authors： Solangaarachchi SM,Harper JL

更新日期：1989-02-01 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：:Global atmospheric CO2 is increasing at a rate of 1.5-2 ppm per year and is predicted to double by the end of the next century. Understanding how terrestrial ecosystems will respond in this changing environment is an important goal of current research. Here we present results from a field study of elevated CO2 in a Ca...

journal_title：Oecologia

authors： Jackson RB,Sala OE,Field CB,Mooney HA

更新日期：1994-08-01 00:00:00

abstract：:Selection of sites for oviposition when the risk of predation by green frogs was variable studied in tandems of the damselfly Pyrrhosoma nymphula. In the absence of predators the number of tandems landing increased with the size of the oviposition site and with the number of pairs already present. Pairs approaching an...

journal_title：Oecologia

authors： Rehfeldt GE

更新日期：1990-12-01 00:00:00

abstract：:In order to scale up from the ecophysiological characters of individual plants to population-level questions, we need to determine if character patterns in natural populations are stable through time, and if the characters are related to growth and survival. We investigated these questions in a 3-year study for one ch...

journal_title：Oecologia

authors： Donovan LA,Ehleringer JR

更新日期：1994-12-01 00:00:00

abstract：:After herbivore attack, plants launch a suite of direct and indirect defense responses that must be coordinated if plants are to realize a fitness benefit from these responses. Here we characterize the volatile emissions in the native tobacco plant, Nicotiana attenuata Torr. ex Wats., that are elicited by tobacco horn...

journal_title：Oecologia

authors： Halitschke R,Keßler A,Kahl J,Lorenz A,Baldwin IT

更新日期：2000-08-01 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：:Naïveté can occur within any novel antagonistic interaction, and competitive forces play a fundamental role in shaping community structure, yet competitive naïveté has received very little attention in the literature to date. Naïveté towards a novel competitor is unlikely to result in immediate mortality, but could po...

journal_title：Oecologia

authors： Heavener SJ,Carthey AJ,Banks PB

更新日期：2014-05-01 00:00:00

abstract：:The field thermal biology of sympatric Anolis cooki and A. cristatellus were evaluated in January and in August in desert scrub forest at Playa de Tamarindo near Guanica, Puerto Rico. Data on randomly positioned copper models of lizards, each equipped with a built-in thermocouple, established null hypotheses about bas...

journal_title：Oecologia

authors： Hertz PE

更新日期：1992-04-01 00:00:00

abstract：:Shoot herbivory by the sapling specialist shoot-borer Cromarcha stroudagnesia (Lepidoptera, Pyralidae, Chrysauginae) is shown to have large direct and indirect effects on the rates of height increment and mortality of saplings of its host tree, Tabebuia ochracea (Bignoniaceae), in the secondary successional tropical d...

journal_title：Oecologia

authors： Sullivan JJ

更新日期：2003-06-01 00:00:00

abstract：:Tests of density dependent regulation of population size depend on the concept of equilibrium population size. Such an equilibrium is a purely theoretical construct whose existence in the field is debatable and whose value cannot be measured. An equilibrium is supposed to fluctuate in time, but the extent of the fluct...

journal_title：Oecologia

authors： Wolda H

更新日期：1989-11-01 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：:Tropospheric O(3) and deposition of reactive N threaten the composition and function of natural and semi-natural vegetation even in remote regions. However, little is known about effects of these pollutants individually or in combination on plant species in alpine habitats. We analyzed 11 frequent plant species of a s...

journal_title：Oecologia

authors： Bassin S,Werner RA,Sörgel K,Volk M,Buchmann N,Fuhrer J

更新日期：2009-01-01 00:00:00

abstract：:Relationships involving fire and perennial grasses are controversial in Chihuahuan Desert grasslands of southern New Mexico, USA. Research suggests that fire delays the resprouting of perennial grasses well after two growing seasons. However, such results are confounded by livestock grazing, soil erosion, and drought....

journal_title：Oecologia

authors： Drewa PB,Peters DP,Havstad KM

更新日期：2006-11-01 00:00:00

abstract：:1. The locomotor activity of European salamanders differs from species to species. At all stages of development Triturus vulgaris is more light-active, Salamandra salamandra is dark-active, while Triturus alpestris and cristatus occupy an intermediate position. 2. The activity of the larvae is high but the rhythm is n...

journal_title：Oecologia

authors： Himstedt W

更新日期：1971-06-01 00:00:00

abstract：:Marion Island (47°S, 38°E) has one of the most oceanic climates on earth, with consistently low air temperatures, high precipitation, constantly high humidity, and low incident radiation. Since 1968 mean surface air temperature has increased significantly, by 0.025° C year-1. This was strongly associated with correspo...

journal_title：Oecologia

authors： Smith VR,Steenkamp M

更新日期：1990-11-01 00:00:00

abstract：:Soils of three Picea mariana-Cladina stellaris woodland sites, aged 2, 104 and 137 years after fire, were sampled at 3 cm intervals to 9 cm depth for soil microfungi. Mortierella, Mucor, Penicillium and Trichoderma were the most frequently isolated genera. The species composition of the microfungi remained much the sa...

journal_title：Oecologia

authors： Lucarotti CJ,Kelsey CT,Auclair AN

更新日期：1978-01-01 00:00:00

abstract：:In the tropical dry forest of the central Pacific coast of Mexico the pollination and reproductive success of the bombacaceous tree Ceiba grandiflora was negatively affected by habitat disruption. Two of the three bat species that function as effective pollinators for this species ( Glossophaga soricina and Musonycter...

journal_title：Oecologia

authors： Quesada M,Stoner KE,Rosas-Guerrero V,Palacios-Guevara C,Lobo JA

更新日期：2003-05-01 00:00:00

abstract：:After a period of food deprivation, animals often respond with a period of faster than normal growth. Such responses have been suggested to result in decreased chromosomal maintenance, which in turn may affect the future fitness of an individual. Here, we present a field experiment in which a food deprivation period o...

journal_title：Oecologia

authors： Näslund J,Pauliny A,Blomqvist D,Johnsson JI

更新日期：2015-04-01 00:00:00

abstract：:Rates of algal production were measured at 6 rocky intertidal sites on the southwestern Cape coast, South Africa, where populations of the limpet Patella granularis occur. Rates of algal production and limpet mortality were recorded at each site and both factors affected limpet reproductive fitness. Limpet growth rate...

journal_title：Oecologia

authors： Bosman AL,Hockey PA

更新日期：1988-04-01 00:00:00

abstract：:Competition for space is an important process on tropical coral reefs. Few studies have examined the role sponges play in community structure despite the fact that many sponges are competitively superior to reef-building corals in space acquisition. Surveys conducted throughout the Florida Keys indicated that Chondril...

journal_title：Oecologia

authors： Hill MS

更新日期：1998-11-01 00:00:00

abstract：:While trying to achieve their nutritional requirements, foraging herbivores face the costs of plant defenses, such as toxins. Teasing apart the costs and benefits of various chemical constituents in plants is difficult because their chemical defenses and nutrient concentrations often co-vary. We used an approach deriv...

journal_title：Oecologia

authors： Bedoya-Pérez MA,Issa DD,Banks PB,McArthur C

更新日期：2014-08-01 00:00:00

abstract：:The relation between daily maximal rates of net photosynthesis and plant water status was studied during a dry season on irrigated and non-irrigated, naturally growing, perennial wild plants.Species were examined which differ in phenology, leaf anatomy and morphology: Hammada scoparia, Artemisia herba-alba, Zygophyllu...

journal_title：Oecologia

authors： Schulze E-,Hall AE,Lange OL,Evenari M,Kappen L,Buschbom U

更新日期：1980-04-01 00:00:00

abstract：:The comparative responses of photosynthesis and growth to salinity were investigated for two C3 and one C4 species native to the tidal marshes of the San Francisco Bay-Sacramento River estuary of Northern California. At low salinities (0 or 150 meq l-1), where photosynthetic rates were maximal for all species, the C4 ...

journal_title：Oecologia

authors： Pearcy RW,Ustin SL

更新日期：1984-04-01 00:00:00

abstract：:Six estimates of resource allocation to sexual reproduction (nectar concentration, nectar volume, sugar production, pollinator visitation rates, fruit-set, and seed production) and a single estimate of resource allocation to asexual reproduction (the rate of rooted-branch production) were examined for five species of ...

journal_title：Oecologia

authors： Sutherland S,Vickery RK Jr

更新日期：1988-08-01 00:00:00