[The influence of exogen and endogen factors on the moulting of Pygnogonum litorale (Ström)].

abstract：:Florivores are present in many pollination systems and can have direct and indirect effects on both plants and pollinators. Although the impact of florivores are commonly examined in facultative pollination mutualisms, their effects on obligate mutualism remain relatively unstudied. Here, we used experimental manipula...

journal_title：Oecologia

authors： Althoff DM,Xiao W,Sumoski S,Segraves KA

更新日期：2013-12-01 00:00:00

abstract：:Prosopis is a genus of phreatophytic trees inhabiting hot deserts and semiarid grasslands of the world. Although desert trees are exposed to unusual environmental temperature and water stress, few investigations have evaluated their water relations. This is particularly true for Prosopis species growing in areas where...

journal_title：Oecologia

authors： Nilsen ET,Rundel PW,Sharifi MR

更新日期：1981-08-01 00:00:00

abstract：:The habitats occupied by species of wood warblers (Emberizidae) were compared at two study areas, Itasca State Park, Minnesota and Mount Blue State Park, Maine. Univariate comparisons of each variable of habitat structure show geographic differences for each species of warbler. Habitats available were also different b...

journal_title：Oecologia

authors： Collins SL

更新日期：1983-09-01 00:00:00

abstract：:In this study we examine the influence of temperature on growth, photosynthetic performance and acclimation of two submerged macrophyte species, Elodea canadensis L.C. Rich and Ranunculus aquatilis (L.) Wimmer. The plants were grown at 5, 10 and 15°C and a photon flux density of 300 μmol m-2 s-1 (PAR) in a medium with...

journal_title：Oecologia

authors： Madsen TV,Brix H

更新日期：1997-04-01 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：:The species composition of vesicular-arbuscular mycorrhizal (VAM) fungal communities changed during secondary succession of abandoned fields based on a field to forest chronosequence. Twenty-five VAM fungal species were identified. Seven species were clearly early successional and five species were clearly late succes...

journal_title：Oecologia

authors： Johnson NC,Zak DR,Tilman D,Pfleger FL

更新日期：1991-05-01 00:00:00

abstract：:The life history of Yucca glauca in the Great Plains was the subject of a four year field study. Data were incorporated in a stage transition model (based on rosette size) to explain how populations are maintained in spite of large regional and temporal variation in sexual reproductive success. Rosette size was found ...

journal_title：Oecologia

authors： Kingsolver RW

更新日期：1986-06-01 00:00:00

abstract：:In most animals, siblings from a given reproductive event emerge over a very short period of time. In contrast, many species of birds hatch their young asynchronously over a period of days or weeks, handicapping last-hatched chicks with an age and size disadvantage. Numerous studies have examined the adaptive signific...

journal_title：Oecologia

authors： Wellicome TI

更新日期：2005-01-01 00:00:00

abstract：:Long-termed fumigation of pea seedlings with SO2 caused typical alterations of the concentration of free glutamate and glutamine as well as fluctuations of the activity of glutamate dehydrogenase and glutamine synthetase. Shortly after the beginning of the fumigation with low concentrations of SO2 (up to 0,3 ppm) the ...

journal_title：Oecologia

authors： Jäger HJ,Pahlich E

更新日期：1972-06-01 00:00:00

abstract：:A climate room is described for precise regulation of temperature and humidity. Humidity is regulated by regulation of the dew-point temperature of the air. The ranges for both dew-point and air temperature are from 2°C to 45°C. The precision of regulation for the temperature is ±0.05°C, for the dew-point temperature ...

journal_title：Oecologia

authors： Bruin MK,Brandt DC,Körner FJ

更新日期：1976-12-01 00:00:00

abstract：:Gas exchange characteristics of droughted and rewatered Portulacaria afra were studied during the seasonal shift from CAM to C3 photosynthesis. 14CO2 uptake, stomatal conductance, and total titratable acidity were determined for both irrigated and 2, 4, and 7.5 month waterstressed plants from summer 1984 to summer 198...

journal_title：Oecologia

authors： Guralnick LJ,Ting IP

更新日期：1986-08-01 00:00:00

abstract：:Algal polyunsaturated fatty acids (PUFA), essential for somatic growth and reproduction of aquatic animals, are influenced by ambient environmental conditions, including light and nutrients. Few studies have addressed the extent to which changes in algal PUFA can influence stream herbivore PUFA profiles and the implic...

journal_title：Oecologia

authors： Guo F,Kainz MJ,Sheldon F,Bunn SE

更新日期：2016-06-01 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：:Ring-shaped growth patterns commonly occur in resource-limited arid and semi-arid environments. The spatial distribution, geometry, and scale of vegetation growth patterns result from interactions between biotic and abiotic processes, and, in turn, affect the spatial patterns of soil moisture, sediment transport, and ...

journal_title：Oecologia

authors： Ravi S,D'Odorico P,Wang L,Collins S

更新日期：2008-12-01 00:00:00

abstract：:Developing leaves that are soft, with high concentrations of resources, can be particularly vulnerable to herbivore damage. Since a developing leaf cannot be very tough, given the constraints of cell expansion, the major form of protection is likely to be chemical defence. We investigated changes in concentration of h...

journal_title：Oecologia

authors： Brunt C,Read J,Sanson GD

更新日期：2006-07-01 00:00:00

abstract：:One of the most commonly cited hypotheses explaining invasion success is the enemy release hypothesis (ERH), which maintains that populations are regulated by coevolved natural enemies where they are native but are relieved of this pressure in the new range. However, the role of resident enemies in plant invasion rema...

journal_title：Oecologia

authors： Bohl Stricker K,Stiling P

更新日期：2014-03-01 00:00:00

abstract：:A factorial design of clipping and compaction was used to study the responses of Schizachyrium scoparium and its mycorrhizal symbionts to these stresses. All treatment combinations significantly reduced the growth and biomass of plants relative to controls. Compaction significantly reduced tillering and crown expansio...

journal_title：Oecologia

authors： Wallace LL

更新日期：1987-06-01 00:00:00

abstract：:Resprouting is the main regeneration mechanism after fire in Mediterranean-type ecosystems. Herbivores play an important role in controlling postfire seedling establishment, but their influence on regeneration by resprouting is less well known. To study the effects of fire intensity on resprouting of Adenostoma fascic...

journal_title：Oecologia

authors： Moreno JM,Oechel WC

更新日期：1991-01-01 00:00:00

abstract：:The influence of ant attendance on parasitization of the larvae of three hawthorn psyllid species [Cacopsylla peregrina Förster, C. melanoneura Förster, C. crataegi (Schrank)] was studied over 2 years. All three psyllid species had low parasitization rates. However, the ant-attended C. crataegi was almost exclusively ...

journal_title：Oecologia

authors： Novak H

更新日期：1994-09-01 00:00:00

abstract：:The acetylene reduction method was used to measure nitrogen fixation in the phyllosphere of attached leaves of different phorophytes under natural conditions in a premontane rain forest in Costa Rica. Maximum rates of nitrogen fixation (26 ng N · cm-2 leaf area · h-1) - mainly due to the activity of two species of Scy...

journal_title：Oecologia

authors： Freiberg E

更新日期：1998-11-01 00:00:00

abstract：:Plant roots transfer water between soil layers of different water potential thereby significantly affecting the distribution and availability of water in the soil profile. We used a modification of the heat pulse method to measure sap flow in roots of Grevillea robusta and Eucalyptus camaldulensis and demonstrated a r...

journal_title：Oecologia

authors： Burgess SS,Adams MA,Turner NC,Ong CK

更新日期：1998-07-01 00:00:00

abstract：:Seasonal changes in the photosynthetic characteristics of intact involucral leaves of Anemone raddeana were investigated under laboratory conditions. Net photosynthesis and constant water vapor pressure deficit showed almost the same seasonal trend. They increased rapidly from mid-April immediately after unfolding of ...

journal_title：Oecologia

authors： Yoshie F,Yoshida S

更新日期：1987-05-01 00:00:00

abstract：:The structure and seasonal dynamics of phytoplankton communities in the littoral zone were compared between oligotrophic and eutrophic lakes in the southeastern United States. Differences in diversity and species composition between lakes could be ascribed to long-term variation in nutrients corresponding to trophic s...

journal_title：Oecologia

authors： Lemly AD,Dimmick JF

更新日期：1982-09-01 00:00:00

abstract：:Moths eclosed earlier from pupae of the bertha armyworm,Mamestra configurata, that were exposed briefly (1 to 5 days) to a warm temperature (15 or 20°C) at the beginning of postdiapause pupal-adult metamorphosis and then incubated at 10 or 12.5°C than from pupae incubated at 10 or 12.5°C throughout metamorphosis. The ...

journal_title：Oecologia

authors： Turnock WJ,Bodnaryk RP,Abramson D

更新日期：1986-09-01 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：:Predation by invasive species is a major threat to the persistence of naïve prey. Typically, this negative effect is addressed by suppressing the population size of the invasive predator to a point where the predation pressure does not hinder the viability of the prey. However, this type of intervention may not be eff...

journal_title：Oecologia

authors： García-Díaz P,Binny RN,Anderson DP

更新日期：2021-01-08 00:00:00

abstract：:This study examines the idea that variation in forelimb length among male anurans influences reproductive success, and does so independently of body size. Analyses of covariance and multivariate analyses of morphological data for five species of explosives breeders are used to test the prediction that for species in w...

journal_title：Oecologia

authors： Lee JC

更新日期：1986-05-01 00:00:00

abstract：:Reduced rations of Calotropis gigantea produced a number of negative effects on the grasshopper Poecilocerus pictus such as heavy mortality (42% at 25% ration as aginst 11% at 100% ration), extension of hopper period (from 75 days about 113 days) and increase in the number of instars (from 6-7). At the tested 100, 50 ...

journal_title：Oecologia

authors： Muthukrishnan J,Delvi MR

更新日期：1974-09-01 00:00:00

abstract：:A technique is presented in which desiccation as a source of error in fresh weight determinations of soft-bodied microfauna is avoided by weighing the animal in a drop of silica fluid. ...

journal_title：Oecologia

authors： Lundkvist H

更新日期：1978-01-01 00:00:00

abstract：:Blue-footed boobies (Sula nebouxii) in the Galápagos Islands nest at coastal sites such as cliff edges if Nazca boobies (S. granti) are absent. However, if sympatric with nesting Nazca boobies, they nest nearby, but farther inland, in areas with little topographical relief. Nazca boobies nest at the coastal sites whet...

journal_title：Oecologia

authors： Townsend HM,Huyvaert KP,Hodum PJ,Anderson DJ

更新日期：2002-08-01 00:00:00