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 the most negative value of-0.56 MPa occurring in June. The leaves exhibited nocturnal accumulation of titratable acidity at all sampling periods, with the greatest magnitudes of accumulation occurring late in the growing season. The fruits also exhibited nocturnal accumulation of titratable acidity. The biomass δ13C values of all organs were most negative in December and least negative in June. The findings confirmed earlier suggestions that there may be biologically important differences in carbon isotope content among the various organs of a single plant of D. blochmanae. The water potential of thephotosynthetic organs was highly correlated (r2=0.84) with the biomas δ13C value. A greenhouse study demonstrated that the fruits exhibit an, apical dominance with regard to maintenance of plant water potential during drought.
journal_name
Oecologiajournal_title
Oecologiaauthors
Teeri JAdoi
10.1007/BF00377545subject
Has Abstractpub_date
1984-09-01 00:00:00pages
68-73issue
1eissn
0029-8549issn
1432-1939pii
10.1007/BF00377545journal_volume
64pub_type
杂志文章相关文献
OECOLOGIA文献大全abstract::Leaf water relationships were studied in four widespread forest tree species (Ilex opaca Ait., Cornus florida L., Acer rubrum L., and Liriodendron tulipifera L.). The individuals studied all occurred on the same site and were selected to represent a range of growth forms and water relationships in some of the principa...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00346260
更新日期:1980-09-01 00:00:00
abstract::Regeneration methods for coastal sage srub vegetation after fire were studied in the coastal Santa Monica Mountains of southern California. Six sites were sampled two years after a large fire of fall, 1978. The intensity of fire varied. Foliar cover and flowering incidence were recorded for individuals regenerating by...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00389013
更新日期:1982-06-01 00:00:00
abstract::Successful reproduction in a seasonal environment can be accomplished with resources that are stored before use ("capital resources") or resources that are used immediately ("income resources"). Research examining capital versus income resource usage during reproduction has primarily focused on assigning species to po...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-013-2699-3
更新日期:2013-12-01 00:00:00
abstract::Eggs of the elm leaf beetle Xanthogaleruca luteola are often heavily attacked by the chalcidoid wasp Oomyzus gallerucae. We studied the chemical signals mediating interactions between the egg parasitoid, its host, and the plant Ulmus campestris. Olfactometer bioassays with O. gallerucae showed that volatiles of the ho...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420050287
更新日期:1997-09-01 00:00:00
abstract::Ground-nesting North American landbirds have declined in the longterm, including species with a variety of migratory strategies. The mesopredator release hypothesis explains declines by suggesting that the virtual elimination of top carnivores (large-bodied canids and felids) from much of North America has "released" ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420050583
更新日期:1998-08-01 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
pub_type: 杂志文章
doi:10.1007/BF00317600
更新日期:1991-05-01 00:00:00
abstract::Although predator avoidance has been proposed as one possible factor influencing the distribution of fish among substrate types, no study has addressed this question directly. Groups of juvenile Atlantic cod were offered a choice between pairs of the following three substrates: sand, gravel-pebble and cobble. Their di...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00321187
更新日期:1993-02-01 00:00:00
abstract::Many plant species currently exist in fragmented populations of different sizes, while they also experience unpredictable climatic fluctuation over time. However, we still understand little about how plant demography responds to such spatial and temporal environmental variability. We studied population dynamics of an ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-009-1505-8
更新日期:2010-04-01 00:00:00
abstract::1. There is a well-defined time sequence in the oxygen consumption of Porcellio scaber. A maximal rate (the 'active rate') is obtained in woodlice subjected to the maximal disturbance of food presentation, handling and light. After initial exploratory activity has ceased, the oxygen consumption declines through a seri...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345086
更新日期:1974-03-01 00:00:00
abstract::Dissolved O(2) is an important aquatic ecosystem health indicator. Metabolic and gas exchange (G) rates, which control O(2) concentration, are affected by nutrient loading and other environmental factors. Traditionally, aquatic metabolism has been reported as primary production:community respiration (P:R) ratios using...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-007-0744-9
更新日期:2007-08-01 00:00:00
abstract::The gas exchange characteristics of two C3 desert annuals with contrasting phenologies, Geraea canescens T. & G. (winter-active) and Dicoria canescens T. & G. (summer-active), both Asteraceae, were determined for plants grown under a moderate (25°/15° C, day/night temperature) and a high (40°/27° C) growth temperature...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00384484
更新日期:1982-11-01 00:00:00
abstract::We obtined data on body mass and growth rates for the immature members of two groups of wild baboons in Amboseli National Park, Kenya. Data were collected without feeding, trapping, or handling. The data were separated into cross-sectional and longitudinal components, allowing both the examination of body mass-age rel...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00385038
更新日期:1987-04-01 00:00:00
abstract::Naïveté can occur within any novel antagonistic interaction, and competitive forces play a fundamental role in shaping community structure, yet competitive naïveté has received very little attention in the literature to date. Naïveté towards a novel competitor is unlikely to result in immediate mortality, but could po...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-013-2874-6
更新日期:2014-05-01 00:00:00
abstract::Decomposition of standing dead trees that were killed by fire was examined for 10 species in the Great Smoky Mountains National Park. The decrease in wood density as fire age increased was used to estimate decomposition rates. Quercus prinus had the fastest decay rate (11% yr-1) while Pinus virginiana had the slowest ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00363839
更新日期:1982-02-01 00:00:00
abstract::This study examined the effects of elevated CO2 on secondary metabolites for saplings of tropical trees. In the first experiment, nine species of trees were grown in the ground in open-top chambers in central Panama at ambient and elevated CO2 (about twice ambient). On average, leaf phenolic contents were 48% higher u...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-002-1005-6
更新日期:2002-09-01 00:00:00
abstract::The principal function of isoprene biosynthesis in plants remains unclear, but emission rates are positively correlated with temperature and light, supporting a role for isoprene in maintaining photosynthesis under transient heat and light stress from sunflecks. Isoprene production is also inversely correlated with CO...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-011-1947-7
更新日期:2011-05-01 00:00:00
abstract::Soil nutrient availability directly enhances vegetative growth, flowering, and fruiting in alpine ecosystems. However, the impacts of nutrient addition on pollinator visitation, which could affect seed output indirectly, are unknown. In a nutrient addition experiment, we tested the hypothesis that seed output in the i...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-004-1780-3
更新日期:2005-03-01 00:00:00
abstract::Many ecological studies rely heavily on chemical analysis of plant and animal tissues. Often, there is limited time and money to perform all the required analyses and this can result in less than ideal sampling schemes and poor levels of replication. Near infrared reflectance spectroscopy (NIRS) can relieve these cons...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420050591
更新日期:1998-09-01 00:00:00
abstract::1. The locomotor activity of European salamanders differs from species to species. At all stages of development Triturus vulgaris is more light-active, Salamandra salamandra is dark-active, while Triturus alpestris and cristatus occupy an intermediate position. 2. The activity of the larvae is high but the rhythm is n...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345813
更新日期:1971-06-01 00:00:00
abstract::The ability to respond in a specific manner to different light conditions imposed by different species of grass is a major factor contributing to white clover persistence in pastures. Gaps in a pasture provide light with a higher red:far-red ratio (R:FR) and higher photosynthetic photon flux density (PPFD) than the li...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420000453
更新日期:2000-10-01 00:00:00
abstract::To improve the understanding of how native plant diversity influences invasion, we examined how population and community diversity may directly and indirectly be related to invasion in a natural field setting. Due to the large impact of the dominant C(4) grass species (Andropogon gerardii) on invasion resistance of ta...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-011-2157-z
更新日期:2012-04-01 00:00:00
abstract::The period between oviposition and the start of hatching varied from about 17 weeks at 3°C to about 1 week at 22°C, and the length of the hatching period varied from about 34 days at 3°C to about 3 days at 22°C. Regression equations are provided to estimate the lengths of both periods at all temperatures between 3°C a...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345242
更新日期:1972-03-01 00:00:00
abstract::As humans continue to alter tropical landscapes across the world, it is important to understand what environmental factors help determine the persistence of biodiversity in modified ecosystems. Studies on well-known taxonomic groups can offer critical insights as to the fate of biodiversity in these modified systems. ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-015-3495-z
更新日期:2016-03-01 00:00:00
abstract::Asexual fungal endophytes, which do not produce reproductive structures, spread in host populations only vertically via the propagules of their hosts. With such a close relationship between the fitness of the asexual endophyte and that of the host, the relationship is traditionally thought to be mutualistic. Here we p...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-007-0660-z
更新日期:2007-06-01 00:00:00
abstract::Disturbances reduce the biota in stream ecosystems, and leave biological legacies, including remnant species, which potentially influence post-disturbance community development but are poorly understood. We investigated whether three remnant species, the snail Radix peregra, the mayfly Serratella ignita and the freshw...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-006-0412-5
更新日期:2006-07-01 00:00:00
abstract::Nitrogen mineralization and net nitrification rates were 3-7 times greater in soil incubations from a girdled Liriodendron tulipifera (L.) stand than in a control stand. Neither litter nor root extracts had an inhibitory effect on nitrogen mineralization or nitrification rate. A lack of nitrification inhibitors also w...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345323
更新日期:1979-01-01 00:00:00
abstract::In a tropical environment near the equator in Nairobi, Kenya, flesh fly development is nearly continuous throughout the year with only a few individuals being channeled into pupal diapause during the coldest months. Two species reared in a field cage completed 7 generations/year. Generation time for nondiapause flies ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345543
更新日期:1978-01-01 00:00:00
abstract::Dormancy is a common way in which organisms survive environmental conditions that would be lethal to the active individual. However, while dormant, individuals forego reproduction. Hence theory suggests an optimal time in which to enter dormancy, depending on risks associated with both remaining active and entering do...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-004-1657-5
更新日期:2004-11-01 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
pub_type: 杂志文章
doi:10.1007/s00442-013-2798-1
更新日期:2014-03-01 00:00:00
abstract::In the Central Negev, the arido-active Hammada scoparia (Chenopodiaceae) is mainly distributed in runnels and loessial plains of the wadis and exists with fewer and smaller individuals on slopes and tops of the neighboring hills. At the end of the dry season, water relations and chloride content of plants from these h...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345961
更新日期:1976-12-01 00:00:00