Abstract:
:Models of the evolution of seed dormancy reveal that dormancy is favoured either when opportunities for establishment vary over time and when there is wide variation in the probability of success, or when the probability of success is limited by frequency dependence. Empirical evidence supporting the temporal heterogeneity hypothesis exists, but there is scant evidence for dormancy being favoured by frequency dependent competition among seedlings. We test the hypothesis that the intensity of between-sib competition should favour a positive relationship between maternal fecundity and seed dormancy. This hypothesis is supported for the rare, vernal pool annual,Pogogyne abramsii: the proportion of dormant offspring was significantly higher among high fecundity mothers than among other mothers. Dormancy inP. abramsii is controlled by the seed coat, a maternal tissue, so delaying germination favours the inclusive fitness of mothers by reducing the potential for competition among siblings. Seed weight and time to first germination varied significantly amongP. abramsii plants and mean seed weight increased linearly with plant biomass. Seed weight and seed number are independently regulated by plant size. Overall, seed weight varied 10-fold and variability in seed weight within mothers was not explained by plant biomass, seed yield or mean seed weight. GerminableP. abramsii seeds were significantly heavier than dormant seeds, and germinable seeds heavier than 0.20 mg germinated more rapidly than those smaller than 0.20 mg.
journal_name
Oecologiajournal_title
Oecologiaauthors
Zammit C,Zedler PHdoi
10.1007/BF00665590subject
Has Abstractpub_date
1990-08-01 00:00:00pages
24-28issue
1eissn
0029-8549issn
1432-1939pii
10.1007/BF00665590journal_volume
84pub_type
杂志文章相关文献
OECOLOGIA文献大全abstract::Studies of phenotypic variation in nature often consider only a single potential selective agent. In such cases, it remains an open question as to whether variation attributed to that single measured agent might be influenced by some other unmeasured agent. Previous research has shown that phenotypic variation in the ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-012-2485-7
更新日期:2013-05-01 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
pub_type: 杂志文章
doi:10.1007/BF00377337
更新日期:1986-12-01 00:00:00
abstract::Short-term effects of environmental perturbations on various life history traits are reasonably well documented in birds and mammals. But, in the present context of global climate change, there is a need to consider potential long-term effects of natal conditions to better understand and predict the consequences of th...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-009-1482-y
更新日期:2010-02-01 00:00:00
abstract::Severe droughts may alter the reproductive phenology of tropical tree species, but our understanding of these effects has been hampered by confounded variation in drought, light and other factors during natural drought events. We used a large-scale experimental reduction of throughfall in an eastern-central Amazon for...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-006-0507-z
更新日期:2006-11-01 00:00:00
abstract::Most fish species are regularly subjected to periods of starvation during which a reduction of energy turnover might be favourable for the animal. This reduction of energy flux may be achieved by changes in thermal behaviour and/or swimming activity. We investigated such behavioural changes during starvation and subse...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-001-0830-3
更新日期:2002-02-01 00:00:00
abstract::The fate of individual plants of Helianthus annuus was monitored in populations sown at a density of 650 seeds m-2. Ninety six percent of the seeds germinated but only fifty two percent of the seedlings survived to the end of the experiment due to self-thinning. Whilst the seedlings emerged over only four days the cot...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00379716
更新日期:1983-02-01 00:00:00
abstract::Thermogenically elevated cone temperatures were measured in two Macrozamia cycad species that differ in their daily heating time. Mathematical models of the cones' thermo-physics were tested for their accuracy in predicting these cone temperatures and for comparison of the energetics of both species and the sexes with...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-005-0045-0
更新日期:2005-06-01 00:00:00
abstract::The climatic control of productivity for two populations of the lichen Cetraria cucullata (Bell.) Ach. growing in the arctic tundra of northern Alaska (70°28'N, 157°23'W) was examined. Respiratory losses of carbon vary with tissue temperature, tissue water content, and time since wetting. Potential net photosynthetic ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00348040
更新日期:1981-08-01 00:00:00
abstract::In this paper, we test the mid-domain hypothesis as an explanation for observed patterns of flowering diversity in two sub-alpine communities of insect-pollinated plants. Observed species richness patterns showed an early-season increase in richness, a mid-season peak, and a late-season decrease. We show that a "mid-d...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-004-1694-0
更新日期:2005-01-01 00:00:00
abstract:CONCLUSION:For the abovementioned reasons, and with all due respect to the scholarship of Mansson and McGlade, who display a deep knowledge of thermodynamics and ecology, I cannot agree that Odum's use of energy concepts is "wholly discredited". Refinements from microscopic thermodynamics may not have been faithfully c...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00328970
更新日期:1993-04-01 00:00:00
abstract::Spartina alterniflora has been reported to lose significant amounts of oxygen to its rhizosphere with potentially important effects on salt-marsh biogeochemical cycling and plant productivity. The potential significance of this oxidative pathway was evaluated using laboratory split-chamber experiments to quantify oxyg...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00325879
更新日期:1994-05-01 00:00:00
abstract::We used a laboratory assay to partition the effects of predation and intraspecific competition on the establishment, mating success, and brood development of an endophytic herbivore. We selected a system in which the same predator feeds both exophytically and endophytically on the same prey, to evaluate the role of he...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-002-1054-x
更新日期:2002-12-01 00:00:00
abstract::The central mudminnow (Umbra limi) and yellow perch (Perca flavescens) are two species of fishes that commonly co-occur in small bog lakes in the Great Lakes region of North America. Both species are dietary generalists with a high degree of dietary overlap, and perch populations have been shown to have a strong negat...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00379865
更新日期:1985-05-01 00:00:00
abstract::Body size at metamorphosis is a critical trait in the life history of amphibians. Despite the wide-spread use of amphibians as experimental model organisms, there is a limited understanding of how multiple abiotic and biotic factors affect the variation in metamorphic traits under natural conditions. The aim of our st...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-010-1586-4
更新日期:2010-07-01 00:00:00
abstract::Larval digenetic trematodes commonly castrate their first intermediate hosts, and should therefore impose strong selection on the timing and mode of host reproduction. Here we examine spatial variation in infection by trematodes in the freshwater snail Potamopyrgus antipodarum. Snails were collected at 11 different si...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00328690
更新日期:1995-09-01 00:00:00
abstract::Rodents of the family Heteromyidae are proficient gatherers and hoarders of seeds. A major component of their adaptive specialization for harvesting and transporting seeds is their spacious, fur-lined cheek pouches. Precise measurements of cheek pouch capacities are essential if ecologists are to understand the foragi...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420050349
更新日期:1997-12-01 00:00:00
abstract::The influence of ant attendance on parasitization of the larvae of three hawthorn psyllid species [Cacopsylla peregrina Förster, C. melanoneura Förster, C. crataegi (Schrank)] was studied over 2 years. All three psyllid species had low parasitization rates. However, the ant-attended C. crataegi was almost exclusively ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00317085
更新日期:1994-09-01 00:00:00
abstract::Olfactory responses of parasitoids can be variable. This was shown by olfactometer experiments with females of two sibling Asobara species, larval endoparasitoids of Drosophilidae. Oviposition experiences of adult female parasitoids significantly altered their behavioural responses in microhabitat and host location. F...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00379874
更新日期:1984-08-01 00:00:00
abstract::The influence of irrigation and nitrogen fertilization in early summer on root and shoot growth of Atriplex confertifolia, a C4 shrub species, was examined in a cold-winter desert community in northern Utah. Soil water and xylem pressure potentials were monitored during the summer period.At the time of watering the su...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00344912
更新日期:1978-01-01 00:00:00
abstract::Atmospheric inputs of N and S in bulk deposition (open collectors) and throughfall (beneath canopy collectors) were measured in and adjacent to two Class 1 wilderness areas of the northeastern US. In general, atmospheric S inputs followed our expectations with throughfall S fluxes increasing with elevation in the Whit...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-014-3121-5
更新日期:2015-01-01 00:00:00
abstract::In the present study we investigated the economics of load transport in the grass-cutting ant Atta vollenweideri by focusing on the effects of load mass, width and length on individual transport rates. Both running speed of foragers and the amount of material transported a given distance per unit time, i.e. gross mate...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-002-0882-z
更新日期:2002-04-01 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
pub_type: 杂志文章
doi:10.1007/BF00379855
更新日期:1985-05-01 00:00:00
abstract::Studies with Nasutitermes and Rhynchotermes (Isoptera, Nasutitermitinae) in a Costa Rican rainforest suggest that nitrogen fixation by gut symbionts may play a significant role in termite nutrition. Leaf-litter feeders ingest more and fix less nitrogen than do wood-litter feeders; both species feed preferentially on N...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00346270
更新日期:1980-09-01 00:00:00
abstract::Several mistletoe species are able to grow and reproduce on both deciduous and evergreen hosts, suggesting a degree of plasticity in their ability to cope with differences in intrinsic host functions. The aim of this study was to investigate the influence of host phenology on mistletoe water relations and leaf gas exc...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-015-3519-8
更新日期:2016-04-01 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
pub_type: 杂志文章
doi:10.1007/s004420050547
更新日期:1998-07-01 00:00:00
abstract::Mature growth-phase internodes of Alaska paper birch (Betula resinifera) are preferred by the snowshoe hare (Lepus americanus) over juvenile growth-phase internodes due to the low food value of the latter. While the mature over juvenile preferencec cannot be explained by the levels of inorganic nutrients or gross chem...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00384463
更新日期:1984-12-01 00:00:00
abstract::Interspecific hybridization is an important and common evolutionary mechanism, but field-based evaluations of changes in realized niches and zonation patterns of native and exotic hybrids relative to those of their parental plant species are rare. Would native hybrids forming hybrid zones between their parental specie...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-018-4251-y
更新日期:2018-11-01 00:00:00
abstract:: In spite of recent theoretical interest, few field studies have addressed the links between individual behavioral decisions and population distribution. This work analyzes the foraging behavior of individuals and the spatial distribution of a population of blue tits (Parus caeruleus) just before the main breeding sea...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420050256
更新日期:1997-07-01 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
pub_type: 杂志文章
doi:10.1007/BF00317863
更新日期:1994-12-01 00:00:00
abstract::After a period of food deprivation, animals often respond with a period of faster than normal growth. Such responses have been suggested to result in decreased chromosomal maintenance, which in turn may affect the future fitness of an individual. Here, we present a field experiment in which a food deprivation period o...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-015-3263-0
更新日期:2015-04-01 00:00:00