Habitat structure, dispersal strategies and queen number in two boreal Leptothorax ants.

abstract：:The photosynthetic pathways of 42 species of the genusEuphorbia growing wild, naturalized or cultivated in Egypt were investigated. The criteria used included the δ13C- and δD-values and Kranz anatomy of the leaves. There is a relationship between the photosynthetic pathway and the ecological conditions in the habitat...

journal_title：Oecologia

authors： Batanouny KH,Stichler W,Ziegler H

更新日期：1991-09-01 00:00:00

abstract：:Spatial distribution in the two collembolan species Tomocerus minor and Orchesella cincta is greatly influenced by the distribution of the environmental factors water and food. T. minor is totally restricted in distribution to water-saturated places, where it forms spaced-out aggregations. O. cincta assembles in water...

journal_title：Oecologia

authors： Verhoef HA,Nagelkerke CJ

更新日期：1977-01-01 00:00:00

abstract：:No definitive explanation for the form of the relationship between species diversity and ecosystem productivity exists nor is there agreement on the mechanisms linking diversity and productivity across scales. Here, we examine changes in the form of the diversity-productivity relationship within and across the plant c...

journal_title：Oecologia

authors： Jennings MD,Williams JW,Stromberg MR

更新日期：2005-05-01 00:00:00

abstract：:A search for desiccation tolerant grasses in India revealed nine grass species (in the genera Eragrostiella, Oropetium and Tripogon) whose ability to recover from airdryness had not previously been reported. Dry leaves of these species recover uninjured within 24 h of plants receiving water. Desiccation tolerance limi...

journal_title：Oecologia

authors： Gaff DF,Bole PV

更新日期：1986-12-01 00:00:00

abstract：:Host use by herbivores is largely determined by host properties such as nutrient content and chemical defence against foragers. The impacts of these attributes on a herbivore may largely depend on its life cycle stage. Lichen species are known to differ in nutritional quality and level of chemical defence and, consequ...

journal_title：Oecologia

authors： Pöykkö H,Backor M,Bencúrová E,Molcanová V,Backorová M,Hyvärinen M

更新日期：2010-10-01 00:00:00

abstract：:This study assessed the effect of nutrient enrichment on organic matter breakdown in an alpine springbrook, using alder leaf packs to which phosphorus and nitrogen were added in the form of slow-release fertilizer briquettes. The breakdown of leaf packs with nutrients added (k=0.0284 day-1) was significantly faster th...

journal_title：Oecologia

authors： Robinson CT,Gessner MO

更新日期：2000-02-01 00:00:00

abstract：:Demographic characteristics associated with the maintenance and growth of populations, such as seed dynamics, seedling emergence, survival, and tiller dynamics were examined for two tussock grasses, the native Agropyron spicatum and the introduced Agropyron desertorum in a 30-month field study. The introduced grass wa...

journal_title：Oecologia

authors： Pyke DA

更新日期：1990-04-01 00:00:00

abstract：:Induction of plant defence against herbivores may include the attraction by volatile infochemicals of natural enemies of the herbivore. The emitted volatiles that mediate this attraction may also affect the behaviour of the herbivore itself. In this paper we investigate the response of the herbivorous spider miteTetra...

journal_title：Oecologia

authors： Dicke M,Dijkman H

更新日期：1992-10-01 00:00:00

abstract：:Behavioral traits and diet were traditionally thought to be highly plastic within individuals. This view was espoused in the widespread use of optimality models, which broadly predict that individuals can modify behavioral traits and diet across ecological contexts to maximize fitness. Yet, research conducted over the...

journal_title：Oecologia

authors： Toscano BJ,Gownaris NJ,Heerhartz SM,Monaco CJ

更新日期：2016-09-01 00:00:00

abstract：:The prey naiveté hypothesis suggests that native prey may be vulnerable to introduced predators because they have not evolved appropriate defenses. However, recent evidence suggests that native prey sometimes exhibit induced defenses to introduced predators, as a result of rapid evolution or other processes. We examin...

journal_title：Oecologia

authors： Bible JM,Griffith KR,Sanford E

更新日期：2017-03-01 00:00:00

abstract：:The leaves of Cymopterus longipes form prostrate rosettes early in the spring. As the weather warms, these leaves are elevated on a pseudoscape (false stem) which develops below the rosette through the elongation of the caudex (in the region between root and shoot). The effect of this growth form change on the water r...

journal_title：Oecologia

authors： Werk KS,Ehleringer J,Harley PC

更新日期：1986-06-01 00:00:00

abstract：:In the eight Pardosa species studied, aerial dispersal occurs generally in the young instars. The climatic conditions, particularly wind but also temperature and humidity, affect the occurrence of aerial dispersal. Within the different systematic groups in the genus, species with relatively high and relatively low dis...

journal_title：Oecologia

authors： Richter CJ

更新日期：1970-09-01 00:00:00

abstract：:Interspecific relationships such as mutualism and parasitism are major drivers of biodiversity. Because such interactions often comprise more than two species, ecological studies increasingly focus on complex multispecies systems. However, the spatial heterogeneity of multi-species interactions is often poorly underst...

journal_title：Oecologia

authors： Schöner CR,Schöner MG,Kerth G,Grafe TU

更新日期：2013-09-01 00:00:00

abstract：:Southern grasshopper mice (Onychomys torridus) were allowed to junt buried mealworms in a laboratory arena. The prey were arranged in two patterns, one aggregated and one relatively dispersed. Mice captured more prey from the dispersed treatment in the 2 h experiment, a result that can be attributed to both the greate...

journal_title：Oecologia

authors： Taylor RJ

更新日期：1977-09-01 00:00:00

abstract：:The ostracod Cyprideis torosa Jones, 1850 is a dominant species in the meiofauna of brackish water habitats. Its production in the field over a five-year period has been calculated using two production models. The first model uses the age-distribution of shells preserved in the sediment to assess the stage-specific mo...

journal_title：Oecologia

authors： Herman PM,Heip C,Vranken G

更新日期：1983-06-01 00:00:00

abstract：:Hydrologic regime is an important control of primary production in wetland ecosystems. I investigated the coupling of flooding, soil salinity and plant production in northern prairie marshes that experience shallow spring flooding. Field experiments compared whitetop (Scolochloa festucacea) marsh that was: (1) nonfloo...

journal_title：Oecologia

authors： Neill C

更新日期：1993-10-01 00:00:00

abstract：:This paper catalogues several different dichotomies that have all been termed r- and K-selection. The status of the concept of r- and K-selection is discussed and a more restricted usage of the terms is recommended. ...

journal_title：Oecologia

authors： Parry GD

更新日期：1981-03-01 00:00:00

abstract：:Tree leaf litter inputs to freshwater systems are a major resource and primary drivers of ecosystem processes and structure. Spatial variation in tree species distributions and forest composition control litter inputs across landscapes, but inputs to individual lentic habitat patches are determined by adjacent plant c...

journal_title：Oecologia

authors： Pintar MR,Resetarits WJ

更新日期：2017-03-01 00:00:00

abstract：:Populations of invasive species tend to have fewer parasites in their introduced ranges than in their native ranges and are also thought to have fewer parasites than native prey. This 'release' from parasites has unstudied implications for native predators feeding on exotic prey. In particular, shifts from native to e...

journal_title：Oecologia

authors： Locke SA,Bulté G,Marcogliese DJ,Forbes MR

更新日期：2014-05-01 00:00:00

abstract：:Although plant growth is generally recognized to be influenced by allocation to defense, genetic background (e.g., inbreeding), and gender, rarely have those factors been addressed collectively. In quaking aspen (Populus tremuloides Michx.), phenolic glycosides (PGs) and condensed tannins (CTs) constitute up to 30 % o...

journal_title：Oecologia

authors： Cole CT,Stevens MT,Anderson JE,Lindroth RL

更新日期：2016-06-01 00:00:00

abstract：:Generalist parasites may disproportionately use certain hosts because of different benefits associated with each host species. I measured the growth rate of the marine snail Trichotropis cancellata, a facultative kleptoparasite that can suspension feed and steal food, on different hosts to determine the relative nutri...

journal_title：Oecologia

authors： Iyengar EV

更新日期：2004-03-01 00:00:00

abstract：:We tested, through field experiments and simulation models, the hypothesis that fruit-searching tephritid fruit flies adjust their within-tree search persistence according to the sequence and timing of encounters with parasitized (i.e. egg-infested) and unparasitized Crataegus sp. host fruit. In the field, we presente...

journal_title：Oecologia

authors： Roitberg BD,Prokopy RJ

更新日期：1984-04-01 00:00:00

abstract：:This is the first study to investigate whether scatter-hoarding behavior, a conditional mutualism, can be disrupted by forest fragmentation. We examined whether acouchies (Myoprocta acouchy, Rodentia) and agoutis (Dasyprocta leporina, Rodentia) changed scatter-hoarding behavior toward seeds of Astrocaryum aculeatum (A...

journal_title：Oecologia

authors： Jorge ML,Howe HF

更新日期：2009-10-01 00:00:00

abstract：:Soil properties of pioneer Pinus flexilis stands with similar topography and climate were investigated. Soils supporting this tree in association with Cercocarpus ledifolius were found to have higher percentages of total nitrogen than soils beneath similar stands lacking Cercocarpus.An excavated Cercocarpus ledifolius...

journal_title：Oecologia

authors： Lepper MG,Fleschner M

更新日期：1977-12-01 00:00:00

abstract：:CO2 exchange characteristics and the activity of the carboxylating enzymes phosphoenolpyruvate carboxylase (PEP-C, E.C. 4.1.1.31) and ribulose 1,5-bisphosphate carboxylase (RuBP-C, E.C. 4.1.1.39) during one year in the greenhouse and at two levels of light and temperature in growth chambers were determined in the C3-C...

journal_title：Oecologia

authors： Fladung M,Hesselbach J

更新日期：1989-05-01 00:00:00

abstract：:Plants of Dudleya blochmanae were studied over a growing season (December-June) in their native habitat on the central California coast. During the season soil water potential fluctuatdd widely, becoming unmeasurably negative (<-5.0 MPa) by early May. In contrast, leaf water potential did not fluctuate greatly with th...

journal_title：Oecologia

authors： Teeri JA

更新日期：1984-09-01 00:00:00

abstract：:Life history changes may change resource use. Such shifts are not well understood in the dung beetles, despite recognised differences in larval and adult feeding ability. We use the flightless dung beetle Circellium bacchus to explore such shifts, identifying dung sources of adults using DNA metabarcoding, and compari...

journal_title：Oecologia

authors： Kerley GIH,Landman M,Ficetola GF,Boyer F,Bonin A,Rioux D,Taberlet P,Coissac E

更新日期：2018-09-01 00:00:00

abstract：:In abandoned or extensively managed grasslands, the mechanisms involved in pioneer tree species success are not fully explained. Resource competition among plants and microclimate modifications have been emphasised as possible mechanisms to explain variation of survivorship and growth. In this study, we evaluated a nu...

journal_title：Oecologia

authors： Picon-Cochard C,Coll L,Balandier P

更新日期：2006-06-01 00:00:00

abstract：:Mediterranean evergreen forests of Corsica are characterized by relatively high species diversity of arthropods with low population densities. Food is never superabundant for Corsican blue tits Parus caeruleus. This study focused on the composition of the food of blue tit nestlings and especially on two main component...

journal_title：Oecologia

authors： Bańbura J,Blondel J,de Wilde-Lambrechts H,Galan MJ,Maistre M

更新日期：1994-12-01 00:00:00

abstract：:Tree population size structures and dispersion patterns were studied using stem maps in three old-growth western hemlock (Tsuga heterophylla Sarg.)-western redcedar (Thuja plicata Donn.) stands in the Rocky Mountains of northern Idaho and adjacent Washington. The two species were codominant in one stand, hemlock domin...

journal_title：Oecologia

authors： Turner DP,Franz EH

更新日期：1985-12-01 00:00:00