Palearctic predator invades North American Great Lakes.

abstract：:Four colonies of the desert leaf-cutter ant Acromyrmex versicolor versicolor (Pergande) located 30 miles N.E. of Tempe, Arizona were observed over a 7 month period. The ants utilized trails in foraging, a characteristic of higher attines, as well as foraging singly, a typical pattern among the more primitive gardeners...

journal_title：Oecologia

authors： Gamboa GJ

更新日期：1975-03-01 00:00:00

abstract：:The late-glacial climatic oscillation, 12-10 ka BP, is characterised in ice core oxygen isotope profiles by a rapid and abrupt return to glacial climate. Recent work has shown that associated with this cooling was a drop in atmospheric CO2 concentration of ca. 50 ppm. In this paper, the impact of these environmental c...

journal_title：Oecologia

authors： Beerling DJ

更新日期：1996-10-01 00:00:00

abstract：:Lack 18:125-128 (1967) proposed that clutch size in precocial species was regulated by nutrients available to females during breeding. Drent and Daan 68:225-252 (1980) proposed the individual optimization hypothesis, whereby individual state determines the optimal combination of breeding date and clutch size. Neither ...

journal_title：Oecologia

authors： Sedinger JS,VanDellen AW,Leach AG,Riecke TV

更新日期：2017-02-01 00:00:00

abstract：:Plant species vary greatly in the degree to which floral morphology restricts access to the flower interior. Restrictiveness of flower corollas may influence heterospecific pollen receipt, but the impact of floral morphology on heterospecific pollen transfer has received little attention. We characterized patterns of ...

journal_title：Oecologia

authors： Montgomery BR,Rathcke BJ

更新日期：2012-02-01 00:00:00

abstract：:The demographic and ecological characteristics of island populations of small mammals have received increasing attention in recent years, but few studies have compared the behavioral characteristics of island populations with those of mainland populations. Behavior is considered an important variable because it is bel...

journal_title：Oecologia

authors： Halpin ZT

更新日期：1981-01-01 00:00:00

abstract：:Although many studies now examine how multiple factors influence the dynamics of herbivore populations, few studies explicitly attempt to document where and when each is important and how they vary and interact. In fact, how temporal variation in top-down (natural enemies) and bottom-up (host plant resources) factors ...

journal_title：Oecologia

authors： Gratton C,Denno RF

更新日期：2003-03-01 00:00:00

abstract：:Prey-selection behaviour of the phytoseiid mite Typhlodromus pyri Scheuten was analysed with a Markovtype model of feeding-state dynamics and feeding-state dependent searching behaviour (Sabelis 1981, 1986, 1989; Metz and Van Batenburg 1985a, b). All behavioural characteristics of the predator which are independent of...

journal_title：Oecologia

authors： Dicke M,Sabelis MW,van den Berg H

更新日期：1989-11-01 00:00:00

abstract：:Using field and laboratory observations and experiments over 3 years, I investigated whether reproductive trade-offs shape individual life histories in two natural populations of the water strider, Aquarius remigis, in which univoltine and bivoltine life cycles coexist. Both later eclosion dates and food shortages, ev...

journal_title：Oecologia

authors： Blanckenhorn WU

更新日期：1994-04-01 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：:In highly dynamic and unpredictable environments such as the Southern Ocean, species that have evolved behaviors that reduce the effects of intra-specific competition may have a selective advantage. This is particularly true when juveniles face disadvantages when foraging due to morphological or physiological limitati...

journal_title：Oecologia

authors： Field IC,Bradshaw CJ,Burton HR,Sumner MD,Hindell MA

更新日期：2005-01-01 00:00:00

abstract：:Carbon isotopes are commonly used in trophic ecology to estimate consumer diet composition. This estimation is complicated by the fact that lipids exhibit a more depleted carbon signature (δ13C) than other macromolecules, and are often found at different concentrations among individual organisms. Some researchers argu...

journal_title：Oecologia

authors： Arostegui MC,Schindler DE,Holtgrieve GW

更新日期：2019-12-01 00:00:00

abstract：:Patterns of β-diversity can provide insight into forces shaping community assembly. We analyzed species-rich insect assemblages in two reserve fragments that had once been part of one contiguous Mediterranean coastal pine forest. Local environments are still similar across both fragments, but their landscape context d...

journal_title：Oecologia

authors： Uhl B,Wölfling M,Fiedler K

更新日期：2021-02-01 00:00:00

abstract：:Phenological synchrony between budburst and emergence of larvae is critical for the fitness of many spring-feeding insect herbivores. Therefore, large intraspecific variation in timing of budburst of the host may have a negative effect on the herbivore. We studied how asynchrony between emergence of larvae and budburs...

journal_title：Oecologia

authors： Tikkanen OP,Julkunen-Tiitto R

更新日期：2003-07-01 00:00:00

abstract：:The population metabolism of N. muscorum at a beechwood site in southern England was determined for two separate year periods by two methods; a detailed computer analysis and a 'best estimate'. These methods, which are based on data of biomass, population dynamics, field temperatures, and respiration rates of all life...

journal_title：Oecologia

authors： Goddard SJ

更新日期：1979-01-01 00:00:00

abstract：:Spatiotemporal patchiness in the soil environment is thought to be crucial for the maintenance of soil biodiversity. It provides diverse microhabitats (allowing resource partitioning), and presents these in a complex mosaic, such that competitors may be spatially and temporally separated (promoting patch dynamics). Th...

journal_title：Oecologia

authors： Ettema CH,Rathbun SL,Coleman DC

更新日期：2000-11-01 00:00:00

abstract：:Despite the abundance of studies on competitive interactions, relatively few experiments have been used to fit explicit competition models and estimate competition coefficients. Such estimates are valuable for making contact between theoretical and empirical studies, which tend to measure competition in different unit...

journal_title：Oecologia

authors： Inouye BD

更新日期：1999-09-01 00:00:00

abstract：:Temperature regulation and oxygen consumption were examined in two species of grasshoppers: Melanoplus sanguinipes from cold alpine tundra at elevation 3,800 m, and Trimerotropis pallidipennis from hot desert habitats at elevation 250 m. Both species utilized behavioral thermoregulation to keep body temperature (T b )...

journal_title：Oecologia

authors： Chappell MA

更新日期：1983-01-01 00:00:00

abstract：:The relative importance of allelopathy and resource competition in plant-plant interactions has been vigorously debated but seldom tested. We used activated carbon to manipulate the effects of root exudates of Centaurea maculosa, a noxious weed in much of western North America, on root elongation rates and growth of t...

journal_title：Oecologia

authors： Ridenour WM,Callaway RM

更新日期：2001-02-01 00:00:00

abstract：:The effects of a number of factors, notably leaf mining insects, on the longevity of beech and holm oak leaves have been studied. The regular monitoring of individually labelled leaves was complemented by analysis of leaf fall data. Both methods confirm that these mining insects have only a slight impact on their host...

journal_title：Oecologia

authors： Pritchard IM,James R

更新日期：1984-09-01 00:00:00

abstract：:Four shrub species of the Australian Proteaceae (Hakea sericea, H. gibbosa, H. suaveolens and H. salicifolia) were introduced to South African fynbos shrublands between 1840 and 1860. H. sericea is highly invasive, H. gibbosa and H. suaveolens are moderately invasive and H. salicifolia is not invasive. The allocation ...

journal_title：Oecologia

authors： Richardson DM,Van Wilgen BW,Mitchell DT

更新日期：1987-02-01 00:00:00

abstract：:It is shown that litter of flowering plants of Cirsium vulgare inhibits the growth of seedlings of the same species at concentrations as low as 0.4% (g litter/g soil). The inhibition of growth cannot be fully compensated by adding nutrients, which indicates that autotoxicity may occur. It must be concluded, however, f...

journal_title：Oecologia

authors： de Jong TJ,Klinkhamer PG

更新日期：1985-01-01 00:00:00

abstract：:Competition and facilitation are both considered major factors affecting the structure of plant assemblages, yet few studies have quantified positive, negative, and net effects simultaneously. In this study, we investigated the positive, negative, and net effects of tree saplings on the encroachment of two tree specie...

journal_title：Oecologia

authors： Kennedy PG,Sousa WP

更新日期：2006-06-01 00:00:00

abstract：:Species-habitat relationships are an important aspect of fish life history, particularly in early ontogeny. To address the lack of information on the microhabitat use/requirements of European coarse fishes, particularly 0-group fishes in riverine systems, an empirical model was generated from data collected in the Riv...

journal_title：Oecologia

authors： Copp GH

更新日期：1992-09-01 00:00:00

abstract：:Effective communication regarding distance in the vertical dimension is critical for many ecological, climatological and broader geophysical studies of the Earth. Confusion exists regarding the definition of three English words commonly used to describe the vertical dimension: (1) elevation; (2) altitude; and (3) he...

journal_title：Oecologia

authors： McVicar TR,Körner C

更新日期：2013-02-01 00:00:00

abstract：:We document activity field temperatures, daily activity patterns, and extent of thermoregulation in four species of Liolaemus lizards inhabiting at high altitude (above 3500 m) in the Andes of northern Chile. These four species have similar activity field temperature (Tb near 29°C) despite their being distributed at d...

journal_title：Oecologia

authors： Marquet PA,Ortíz JC,Bozinovié F,Jaksié FM

更新日期：1989-10-01 00:00:00

abstract：:The effect of invertebrate shredders on organic matter dynamics and phosphorus spiralling was studied over a 30-week period in laboratory streams. The streams were fed by groundwater, layered with cobble and gravel from a natural stream, covered with opaque material to eliminate algal growth, and initially contained 1...

journal_title：Oecologia

authors： Mulholland PJ,Elwood JW,Newbold JD,Ferren LA

更新日期：1985-05-01 00:00:00

abstract：:Kinetic properties of NAD malate dehydrogenase (MDH) and glutamate oxaloacetate transaminase (GOT) were analyzed in two genotypes of Arabidopsis thaliana collected in two sites of contrasting climates. Plants from each genotype were acclimated under controlled conditions at four different thermoperiods: 5-10° C, 7-15°...

journal_title：Oecologia

authors： Simon JP,Potvin C,Blanchard MH

更新日期：1983-11-01 00:00:00

abstract：:Mechanical aspects of predation by the shore crab, Carcinus maenas, on the edible mussel, Mytilus edulis, were examined. The shore crabs from the population studied utilized five distinct, largely size-related, mussel-opening techniques. Crushing the mussel umbone appeared the most successful opening method for medium...

journal_title：Oecologia

authors： Elner RW

更新日期：1978-01-01 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：:In a North Carolina population of Diamorpha smallii, densities were artificially manipulated by thinning stands to predetermined densities. Individuals in areas of high density produce fewer seeds than individuals at low density in the same habitat. Three components of fecundity, the number of flowers per plant, the n...

journal_title：Oecologia

authors： Clay K,Shaw R

更新日期：1981-10-01 00:00:00