Why are adaptations for long-range seed dispersal rare in desert plants?

abstract：:Twenty nine harpacticoid copepods are new to Bermuda and significant changes are noted in the distribution records of several species. Six temporary groups are organized to separate the copepods on their apparent zoogeographical ranges: (1) cosmopolitan, (2) warm temperate-tropical, (3) North Atlantic, (4) North Atlan...

journal_title：Oecologia

authors： Coull BC,Herman SS

更新日期：1970-12-01 00:00:00

abstract：:The extent, frequency and causes of pollenlimited seed production were examined in partially selffertile populations of Blandfordia grandiflora for 2 years. Percentage seed set of open-pollinated plants (50-57%) did not differ within or between years, and was about 19% less than experimentally cross-pollinated plants ...

journal_title：Oecologia

authors： Ramsey M

更新日期：1995-07-01 00:00:00

abstract：:Belowground processes in light gap openings are poorly understood, particularly in tropical forests. Fine roots in three zones of light gap openings and adjacent intact forest were regularly measured in buried bags and surface litter envelopes for 2 years. Fine root biomass does not vary significantly within gaps for ...

journal_title：Oecologia

authors： Sanford RL Jr

更新日期：1990-07-01 00:00:00

abstract：:This study uses short-term assays and long-term transplant experiments to document the potential importance of fish predation and herbivory to the distribution and abundance of reef-building corals in a Caribbean back-reef system. Experimental manipulations of fish access reveal that the zonal patterns of the two reef...

journal_title：Oecologia

authors： Littler MM,Taylor PR,Littler DS

更新日期：1989-08-01 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：:Seasonal reductions in food availability may cause animals to catabolize endogenous tissue and the resulting loss of lean mass can hinder their ability to forage and reproduce. While several studies have considered nitrogen isotopes (δ15N) as an indicator of catabolism, relationships between protein intake, body condi...

journal_title：Oecologia

authors： Hughes KL,Whiteman JP,Newsome SD

更新日期：2018-02-01 00:00:00

abstract：:Freezing tolerance as a cold resistance mechanism is described for the first time in a plant growing in the tropical range of the Andean high mountains. Draba chionophila, the plant in which freezing tolerance was found, is the vascular plant which reaches the highest altitudes in the Venezuelan Andes (approximately 4...

journal_title：Oecologia

authors： Azocar A,Rada F,Goldstein G

更新日期：1988-02-01 00:00:00

abstract：:Leslie matrices are used to compare theoretical populations of gregarious and solitarious Desert Locusts, Schistocerca gregaria (Forsk.). Despite their lower fecundity, the synchrony and faster maturation of gregarious populations permit them to have much faster rates of increase than solitarious populations. When rea...

journal_title：Oecologia

authors： Cheke RA

更新日期：1978-01-01 00:00:00

abstract：:Plants in the Mediterranean climate region of California typically experience summer drought conditions, but correlations between zones of frequent coastal fog inundation and certain species' distributions suggest that water inputs from fog may influence species composition in coastal habitats. We sampled the stable H...

journal_title：Oecologia

authors： Corbin JD,Thomsen MA,Dawson TE,D'Antonio CM

更新日期：2005-10-01 00:00:00

abstract：:Convergent growth regulation, where individuals adjust their growth trajectories to reach a targeted final body size, has been reported for many arthropod taxa. Divergent growth, where larger individuals grow proportionately more than smaller individuals, is seldom observed. Most studies based their conclusions on gro...

journal_title：Oecologia

authors： Lytle DA

更新日期：2001-06-01 00:00:00

abstract：:The theory that early successional plants and annual plants will be less well defended against generalist herbivores than later successional plants and perennial plants, because they avoid herbivores by escaping in space and time, is evaluated. The theory is not supported in the ecosystem examined. The correlation bet...

journal_title：Oecologia

authors： Otte D

更新日期：1975-06-01 00:00:00

abstract：:The life history of freshwater cladocerans such as Daphnia spp. is strongly affected by their environment. Factors such as temperature, food quantity and even the presence or absence of predators influence growth, reproduction and morphology of individuals. Recently, it has also become clear that the quality of the fo...

journal_title：Oecologia

authors： Seidendorf B,Meier N,Petrusek A,Boersma M,Streit B,Schwenk K

更新日期：2010-02-01 00:00:00

abstract：:Although host preferences in phytophagous insects may be generated by several factors, few studies have simultaneously examined several potential host choice determinants. In this study we tested the impact of the following potential host choice determinants on host preference of the semi-aquatic lepidopteran Munroess...

journal_title：Oecologia

authors： Dorn NJ,Cronin G,Lodge DM

更新日期：2001-08-01 00:00:00

abstract：:The compensatory growth potential of a grazed fungal biomass was mathematically expressed as a function of patchiness in its distribution and demonstrated in an experiment using the fungivorous collembolan Onychiurus armatus and the soil fungi Verticillium bulbillosum and Penicillium spinulosum. The model addresses th...

journal_title：Oecologia

authors： Bengtsson G,Hedlund K,Rundgren S

更新日期：1993-03-01 00:00:00

abstract：:An adaptive explanation for environmental sex determination is that it promotes sexual size dimorphism when larger size benefits one sex more than the other. That is, if growth rates are determined by environment during development, then it is beneficial to match developmental environment to the sex that benefits more...

journal_title：Oecologia

authors： St Clair RC

更新日期：1998-07-01 00:00:00

abstract：:Correlations between environmental parameters and the distribution of four chromosomal taxa in the acridine grasshopperCaledia captiva (F.) have been analyzed. A bioclimate prediction system (BIOCLIM) was used as a model to determine their bioclimatic envelopes and to predict their probable geographic distributions, b...

journal_title：Oecologia

authors： Kohlmann B,Nix H,Shaw DD

更新日期：1988-05-01 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：:Fluorescent probes have been applied to study by epifluorescence microscopy interactions between species in an Anabaena flos-aquae association, derived from a freshwater community. Glycoconjugates (macromolecules containing carbohydrate residues) have been shown to play a vital role in recognition processes and in for...

journal_title：Oecologia

authors： Müller U,Sengbusch PV

更新日期：1983-05-01 00:00:00

abstract：:In mutualistic interactions, partners obtain a net benefit, but there may also be costs associated with the provision of benefits for a partner. The question of whether aphids suffer such costs when attended by ants has been raised in previous work. Transgenerational effects, where offspring phenotypes are adjusted ba...

journal_title：Oecologia

authors： Tegelaar K,Glinwood R,Pettersson J,Leimar O

更新日期：2013-11-01 00:00:00

abstract：:While the ecological consequences of roads are well described, little is known of their role as agents of natural selection, which can shape adaptive and maladaptive responses in populations influenced by roads. This knowledge gap persists despite a growing appreciation for the influence of evolution in human-altered ...

journal_title：Oecologia

authors： Brady SP

更新日期：2017-08-01 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

abstract：:The effect of drought on embryonic development and on hatching was studied in 13 European Tettigoniidae species. Drought can affect development in three different ways: (1) Embryonic development proceeds slower than if the eggs are in contact with water; (2) it stops (for final diapause) in an earlier embryonic stage;...

journal_title：Oecologia

authors： Ingrisch S

更新日期：1986-11-01 00:00:00

abstract：:Natural history collections are now being championed as key to broad ecological studies, especially those involving human impacts in the Anthropocene. However, collections are going through a crisis that threatens their present and future value, going beyond underfunding/understaffing to a more damaging practice: curr...

journal_title：Oecologia

authors： Salvador RB,Cunha CM

更新日期：2020-03-01 00:00:00

abstract：:Calcium is an essential micronutrient for birds during egg formation and for skeletal development in nestlings. Habitat level studies suggest that birds breeding in low-calcium areas may be limited in the size or number of eggs they lay and in the quality of their nestlings. However, as birds forage non-randomly and m...

journal_title：Oecologia

authors： Wilkin TA,Gosler AG,Garant D,Reynolds SJ,Sheldon BC

更新日期：2009-03-01 00:00:00

abstract：:Natural abundance of (15)N and [N] was studied in thalli of mat-forming lichens collected from tundra and heathland sites in the northern and southern hemispheres. The study includes samples of British Cladonia portentosa from sites in regions of high and low N-loading and in heathland growing both directly on peat an...

journal_title：Oecologia

authors： Ellis CJ,Crittenden PD,Scrimgeour CM,Ashcroft C

更新日期：2003-06-01 00:00:00

abstract：:We studied the nutritional behaviour of hinds foraging on a mixed-forest edge by direct observation of their choices at each season and by measuring nutrient concentration in the plants. We compared nutrient concentrations in the observed diets with those in the total available vegetation, and with those of 1,000 rand...

journal_title：Oecologia

authors： Verheyden-Tixier H,Renaud PC,Morellet N,Jamot J,Besle JM,Dumont B

更新日期：2008-06-01 00:00:00

abstract：:Mimicry between rewarding and non-rewarding flowers within individuals has been accepted as a strategy favored by selection to deceive pollinators. It has been proposed that this mechanism relies on the exploitation of pollinator's sensory biases, but field evidence is still scarce. In this study, we describe the mech...

journal_title：Oecologia

authors： Castillo RA,Caballero H,Boege K,Fornoni J,Domínguez CA

更新日期：2012-07-01 00:00:00

abstract：:Four brook-dwelling populations of Ancylus fluviatilis were studied. Data on life-cycle, specimen number, biomass and egg capsule biomass are reported. By means of experimental data on ingestion, assimilation, growth and egg-production, energy balances are calculated for whole populations.Mean annual biomass turned ou...

journal_title：Oecologia

authors： Streit B

更新日期：1976-09-01 00:00:00

abstract：:Direct and interactive effects of daylength and temperature preconditioning of above- and below-ground parts of Chrysanthemum morifolium Ramat. 'Astrid' are examined in relation to net photosynthesis. Most previous work on thermal preconditioning has concentrated on the effects of a given thermal regime on entire plan...

journal_title：Oecologia

authors： Adams MS,Fayyaz MM

更新日期：1979-01-01 00:00:00

abstract：:The effect of water immersion on the non-parasitic stages of Boophilus microplus were investigated both under laboratory and field conditions. Survival of engorged female ticks was influenced by their age and the temperature of the water. Eggs and larvae were more resistant to submerison than were engorged females and...

journal_title：Oecologia

authors： Sutherst RW

更新日期：1971-09-01 00:00:00