Effects of available P and N:P ratios on non-symbiotic dinitrogen fixation in tallgrass prairie soils.

abstract：:While parasites are increasingly recognized as important components of ecosystems, we currently know little about how they alter ecosystem nutrient availability via host-mediated nutrient cycling. We examined whether infection alters the flow of nutrients through hosts and whether such effects depend upon host diet qu...

journal_title：Oecologia

authors： Narr CF,Frost PC

更新日期：2015-12-01 00:00:00

abstract：:Mortality estimates for the immature stages of two butterfly species, Danaus plexippus and D. chrysippus, were obtained by observing the survival of egg cohorts on different sized patches of food plants (Asclepias spp.), over a one-year period. Losses were variable (0-100%) but usually high (90% and over) throughout t...

journal_title：Oecologia

authors： Zalucki MP,Kitching RL

更新日期：1982-01-01 00:00:00

abstract：:Endozoochory plays a prominent role for the dispersal of seed plants, and dispersal vectors are well known. However, for taxa such as ferns and bryophytes, endozoochory has only been suggested anecdotally but never tested in controlled experiments. We fed fertile leaflets of three ferns and capsules of four bryophyte ...

journal_title：Oecologia

authors： Boch S,Berlinger M,Fischer M,Knop E,Nentwig W,Türke M,Prati D

更新日期：2013-07-01 00:00:00

abstract：:Abiotic drivers of environmental stress have been found to induce CAM expression (nocturnal carboxylation) in facultative CAM species such as Mesembryanthemum crystallinum. The role played by biotic factors such as competition with non-CAM species in affecting CAM expression, however, remains largely understudied. Thi...

journal_title：Oecologia

authors： Yu K,D'Odorico P,Li W,He Y

更新日期：2017-06-01 00:00:00

abstract：:Investigating how prey density influences a prey's combined predation risk from multiple predator species is critical for understanding the widespread importance of multiple predator effects. We conducted experiments that crossed six treatments consisting of zero, one, or two predator species (hellgrammites, greenside...

journal_title：Oecologia

authors： Vance-Chalcraft HD,Soluk DA

更新日期：2005-07-01 00:00:00

abstract：:Controls of fine dynamics were investigated in a Pinus palustris Mill. (longleaf pine) woodland subjected to two understory vegetation treatments (control versus removed) and four overstory treatments (no gap control, and canopy gaps of three sizes with constant total gap area per stand). Fine root (<2 mm diameter) dy...

journal_title：Oecologia

authors： Jones RH,Mitchell RJ,Stevens G,Pecot S

更新日期：2003-01-01 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：:Studies of nitrogen (N) cycling have traditionally focused on N mineralization as the primary process limiting plant assimilation of N. Recent evidence has shown that plants may assimilate amino acids (AAs) directly, circumventing the mineralization pathway. However, the general abundance of soil AAs and their relativ...

journal_title：Oecologia

authors： Hofmockel KS,Fierer N,Colman BP,Jackson RB

更新日期：2010-08-01 00:00:00

abstract：:Some individual plants of the mustard Brassica nigra in lowland California kill eggs of the Crucifer-specialist herbivores Pieris rapae and P. napi by producing a necrotic zone at the base of the egg, thereby apparently desicating it. This is a typical hypersensitivity reaction, but to an atypical stimulus. The eggs c...

journal_title：Oecologia

authors： Shapiro AM,DeVay JE

更新日期：1987-03-01 00:00:00

abstract：: Fluorogenic substrate analogues (MUF substrates) are very sensitive in detecting hydrolytic enzymes. This method was adapted for the quantitative analysis of extracellular enzymes in snails and other animals. It was then used to determine cellobiase, chitobiase, protease, esterase, phosphatase and lipase in the diges...

journal_title：Oecologia

authors： Brendelberger H

更新日期：1996-12-01 00:00:00

abstract：:In this study we tested the hypothesis that the presence of chemical stimuli from a hungry predator would initiate anti-predator responses, while stimuli from a satiated predator would not. We used chemical stimuli released from starved perch (Perca fluviatilis) and from satiated perch (predator). As prey we used adul...

journal_title：Oecologia

authors： Åbjörnsson K,Wagner BM,Axelsson A,Bjerselius R,Olsén KH

更新日期：1997-07-01 00:00:00

abstract：:Net photosynthesis (10 klx light intensity, 150 μE m-2 s-1 PAR) and dark respiration of the lichen Ramalina maciformis at different temperatures are measured in relation to thallus water content. Both first increase with increasing hydration. Dark respiration then remains constant with increased water content until th...

journal_title：Oecologia

authors： Lange OL

更新日期：1980-04-01 00:00:00

abstract：:Nitrogen (N2) fixation was estimated along an aridity gradient in Namibia from the natural abundance of 15N (δ15N value) in 11 woody species of the Mimosacease which were compared with the δ15N values in 11 woody non-Mimosaceae. Averaging all species and habitats the calculated contribution of N2 fixation (N f ) to le...

journal_title：Oecologia

authors： Schulze ED,Gebauer G,Ziegler H,Lange OL

更新日期：1991-11-01 00:00:00

abstract：:Dusky-footed woodrats (Neotoma fuscipes) and desert woodrats (N. lepida) experience pronounced seasonal variations in the aridity of their habitats. The effects of seasonal aridity upon the water conserving abilities of these species were assessed through measurements of water conserving abilities and kidney structure...

journal_title：Oecologia

authors： Stallone JN

更新日期：1979-01-01 00:00:00

abstract：:In order to understand habitat selection, it is important to consider the way individual animals assess the suitability of a future reproductive site. One way of investigating mechanisms (such as those involved in nest site selection) is to examine breeding success and habitat characteristics in terms of animals retur...

journal_title：Oecologia

authors： Hoi H,Krištín A,Valera F,Hoi C

更新日期：2012-05-01 00:00:00

abstract：:The factors that promote ecological separation among closely related sympatric carnivores in tropical forests are poorly understood due to a paucity of field studies. Here, we report on community-wide food resource utilization patterns among eight co-existing carnivores in the Dzanga-Sangha Reserve, Central African Re...

journal_title：Oecologia

authors： Ray J,Sunquist M

更新日期：2001-05-01 00:00:00

abstract：:Resource selection is a function of interactions of organisms (competition, predation) as well as characteristics of the resource and organisms. I provide a quantitative model that integrates these factors. I use the model to predict profitability of fruits to tropical birds, but the model and its predictions are appl...

journal_title：Oecologia

authors： Martin TE

更新日期：1985-07-01 00:00:00

abstract：:Environmental filtering and niche differentiation are processes proposed to drive community assembly, generating nonrandom patterns in community trait distributions. Despite the substantial intraspecific trait variation present in plant communities, most previous studies of trait-based community assembly have used spe...

journal_title：Oecologia

authors： Siefert A

更新日期：2012-11-01 00:00:00

abstract：:Field evidence indicates that adult microtines, especially females, may be a major cause of poor juvenile survival and this may be instrumental in their population regulation. This suggests that males and females behave differently towards young animals. To examine how adult males, nonlactating females, and lactating ...

journal_title：Oecologia

authors： Boonstra R

更新日期：1984-04-01 00:00:00

abstract：:The δ 13C, ‰ values of the two principal, widely distributed CAM species in Big Bend National Park, Texas, were examined and related to phytosociologic and macroclimatic parameters. Samples of Agave lecheguilla and Opuntia engelmannii were collected along an elevational gradient covering 1370 m, and δ values for both ...

journal_title：Oecologia

authors： Eickmeier WG,Bender MM

更新日期：1976-12-01 00:00:00

abstract：:Sources of variation in floral nectar production were investigated in a natural population of Epilobium canum (Onagraceae), a hummingbird-pollinated herbaceous shrub. Field measurements showed significant phenotypic variation among plants in floral nectar production rates. Average variance among flowers within plants ...

journal_title：Oecologia

authors： Boose DL

更新日期：1997-05-01 00:00:00

abstract：:Phenological synchrony between herbivorous insects and host plants is an important determinant of insect distribution and abundance. Non-native insects often experience novel climates, photoperiods, and host plants. How critical time periods of insect life cycles coincide with-or diverge from-phenological windows of h...

journal_title：Oecologia

authors： Ward SF,Moon RD,Herms DA,Aukema BH

更新日期：2019-08-01 00:00:00

abstract：:The number of tracheal gills in the larval Limnephilini varies according to oxygen conditions of the surrounding waters. High proportions of oxygen cause a significant decrease in the number of gills, whereas low oxygen concentrations retult in a significant increase in the number of gills. These morphological adapati...

journal_title：Oecologia

authors： Wichard W

更新日期：1974-06-01 00:00:00

abstract：:Branch sampling of branch diameter and fruit crop on 22 species of Barbadian trees and shrubs provided sufficient data to build regressions between plant size and fruit crop weight. Orchard plants bear much more fruit than wild, feral or garden plants of similar size, but this difference disappears in multiple regress...

journal_title：Oecologia

authors： Peters RH,Cloutier S,Dubé D,Evans A,Hastings P,Kaiser H,Kohn D,Sarwer-Foner B

更新日期：1988-01-01 00:00:00

abstract：:Experimental plots covering a 120 years' observation period in unthinned, even-aged pure stands of common beech (Fagus sylvatica), Norway spruce (Picea abies), Scots pine (Pinus sylvestris), and common oak (Quercus Petraea) are used to scrutinize Reineke's (1933) empirically derived stand density rule [see text], N=tr...

journal_title：Oecologia

authors： Pretzsch H

更新日期：2006-01-01 00:00:00

abstract：:The effects of density on growth and development of Scaphiopus couchi tadpoles in desert ponds were investigated, and sources of mortality over a three-year period were documented. In 16 of the 82 ponds monitored, predation was the principal cause of death, demonstrating that tadpoles in desert ponds may be exposed to...

journal_title：Oecologia

authors： Newman RA

更新日期：1987-01-01 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：:Ecophysiological differences related to photosynthesis were compared in holm oak Quercus ilex leaves from undisturbed holm-oak vegetation, resprouts after fire and resprouts after tree-fell. No significant differences in any parameter measured were observed between the two kinds of resprout throughout the first growin...

journal_title：Oecologia

authors： Fleck I,Grau D,Sanjosé M,Vidal D

更新日期：1996-02-01 00:00:00

abstract：:Identifying the drivers and evolutionary consequences of species interactions is a major goal of community ecology. Network-based analyses can provide mathematical tools to detect non-random patterns of interactions, and potentially help predicting the consequences of such patterns on evolutionary dynamics of symbioti...

journal_title：Oecologia

authors： Chagnon PL,Magain N,Miadlikowska J,Lutzoni F

更新日期：2018-07-01 00:00:00

abstract：:Predator-generated variation in prey energy intake remains the dominant explanation of adaptive response to predation risk in prey life history, morphology and physiology across a wide range of taxa. This "behavioural hypothesis" suggest that chemical or visual signals of predation risk reduce prey energy intake leadi...

journal_title：Oecologia

authors： Beckerman AP,Wieski K,Baird DJ

更新日期：2007-05-01 00:00:00