Effects of floral restrictiveness and stigma size on heterospecific pollen receipt in a prairie community.


: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 pollinator visitation and quantities of conspecific and heterospecific pollen receipt for 29 species with a range of floral morphologies in a prairie community dominated by the introduced plant Euphorbia esula (leafy spurge) which has an unrestrictive morphology. Pollinator overlap was significantly greater between Euphorbia and other unrestrictive flowers than restrictive flowers. Compared to flowers with restrictive morphologies, unrestrictive flowers received significantly more Euphorbia pollen, more heterospecific pollen from other sources, and a greater diversity of pollen species, but not more conspecific pollen. However, stigmatic surface area was significantly larger for flowers with unrestrictive morphologies, and the density of Euphorbia and other heterospecific pollen per stigmatic area did not significantly differ between flower types. These findings suggest that the smaller stigma size in restrictive flowers partly accounts for their decreased heterospecific pollen receipt, but that restrictiveness also allows species to increase the purity of pollen loads they receive. Given that restrictive flowers receive fewer heterospecific pollen grains but at a higher density, the effect of restrictiveness on fecundity depends on whether absolute quantity or density of heterospecific pollen affects fecundity more. Our results also indicate that abundant neighbors are not necessarily important heterospecific pollen sources since Euphorbia pollen was rarely abundant on heterospecifics.






Montgomery BR,Rathcke BJ




Has Abstract


2012-02-01 00:00:00












  • Coexistence of white-footed mice and deer mice may be mediated by fluctuating environmental conditions.

    abstract::White-footed mice, Peromyscus leucopus noveboracensis, and deer mice, P. maniculatus nubiterrae, occur sympatically throughout much of the Appalachian Mountains of the eastern United States. Previous studies have shown that these two species are behaviorally and ecologically similar and do not partition food or microh...


    pub_type: 杂志文章


    authors: Wolff JO

    更新日期:1996-11-01 00:00:00

  • Effects of clipping and soil compaction on growth, morphology and mycorrhizal colonization of Schizachyrium scoparium, a C4 bunchgrass.

    abstract::A factorial design of clipping and compaction was used to study the responses of Schizachyrium scoparium and its mycorrhizal symbionts to these stresses. All treatment combinations significantly reduced the growth and biomass of plants relative to controls. Compaction significantly reduced tillering and crown expansio...


    pub_type: 杂志文章


    authors: Wallace LL

    更新日期:1987-06-01 00:00:00

  • Body size and ecological traits in fleas parasitic on small mammals in the Palearctic: larger species attain higher abundance.

    abstract::We studied the relationships between body size and (a) abundance and (b) host specificity in fleas parasitic on small mammals (rodents and shrews) in the Palearctic taking into account the confounding effect of phylogeny. We tested these relationships both across 127 flea species and within separate phylogenetic clade...


    pub_type: 杂志文章


    authors: Surkova EN,Warburton EM,van der Mescht L,Khokhlova IS,Krasnov BR

    更新日期:2018-10-01 00:00:00

  • Patch marking in the aphid hyperparasitoid, Dendrocerus carpenteri: the information contained in patch marks.

    abstract::The aim of this study was to test if females of the aphid hyperparasitoid Dendrocerus carpenteri (Curtis produce patch marks. We tested if these marks inform a foraging female of the identity of the producer of the mark (the female herself or a conspecific female) and on the producer's success or failure in finding ho...


    pub_type: 杂志文章


    authors: Höller C,Hörmann R

    更新日期:1993-05-01 00:00:00

  • Demography of the twospotted spider mite, Tetranychus urticae Koch.

    abstract::A simple life table model was constructed for Tetranychus urticae in which daily survivorship of eggs and motil stages, fecundity, and development time was altered to assess the impact of each parameter on the intrinsic rate of increase. r. Interpretation of the trade-offs focused on management considerations.A second...


    pub_type: 杂志文章


    authors: Carey JR

    更新日期:1982-01-01 00:00:00

  • Towards a systemic metabolic signature of the arbuscular mycorrhizal interaction.

    abstract::Our experiments addressed systemic metabolic effects in above-ground plant tissue as part of the plant's response to the arbuscular mycorrhizal (AM) interaction. Due to the physiology of this interaction, we expected effects in the areas of plant mineral nutrition, carbon allocation and stress-related metabolism, but ...


    pub_type: 杂志文章


    authors: Fester T,Fetzer I,Buchert S,Lucas R,Rillig MC,Härtig C

    更新日期:2011-12-01 00:00:00

  • Toward a more holistic ecology, and science: the contribution of H.T. Odum.

    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...


    pub_type: 杂志文章


    authors: Patten BC

    更新日期:1993-04-01 00:00:00

  • A non-trophic interaction chain links predators in different spatial niches.

    abstract::Non-trophic interactions, driven by one species changing the behavior but not density of another species, appear to be as pervasive as those involving consumption. However, ecologists have only begun to explore non-trophic interactions in species-rich communities. We investigated interactions within a community includ...


    pub_type: 杂志文章


    authors: Prasad RP,Snyder WE

    更新日期:2010-03-01 00:00:00

  • Diabetes and myocarditis in voles and lemmings at cyclic peak densities--induced by Ljungan virus?

    abstract::Although it is well-documented from theoretical studies that pathogens have the capacity to generate cycles, the occurrence and role of pathogens and disease have been poorly empirically studied in cyclic voles and lemmings. In screening for the occurrence of disease in cyclic vole and lemming populations, we found th...


    pub_type: 杂志文章


    authors: Niklasson B,Nyholm E,Feinstein RE,Samsioe A,Hörnfeldt B

    更新日期:2006-11-01 00:00:00

  • Temporal and spatial pattern of common tern (Sterna hirundo) foraging in the Wadden Sea.

    abstract::In 1989, 313 foraging flights of common terns in the Wadden Sea were radio-tracked. The feeding trips lasted on average 115 min covering about 30 km per flight. Completely tracked flights had a mean radius of 6.3 km. The terns preferred distinct foraging areas in the Wadden Sea. These were visited at site-specific pha...


    pub_type: 杂志文章


    authors: Becker PH,Frank D,Sudmann SR

    更新日期:1993-03-01 00:00:00

  • On the survival of populations in a heterogeneous and variable environment.

    abstract::The survival time of small and isolated populations will often be relatively low, by which the survival of species living in such a way will depend on powers of dispersal sufficiently high to result in a rate of population foundings that about compensates the rate of population extinctions. The survival time of compos...


    pub_type: 杂志文章


    authors: den Boer PJ

    更新日期:1981-08-01 00:00:00

  • The effect of fasting and refeeding on temperature preference, activity and growth of roach, Rutilus rutilus.

    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...


    pub_type: 杂志文章


    authors: van Dijk P,Staaks G,Hardewig I

    更新日期:2002-02-01 00:00:00

  • Generalist caterpillar prey are more palatable than specialists for the generalist predator Iridomyrmex humilis.

    abstract::Experiments are described which test the hypothesis that more host-specific species of caterpillars should be less aceptable to a generalist predator than polyphagous species. Caterpillars of all species were tested in paired choice tests with the Argentine ant, Iridomyrmex humilis. Experiments were replicated ten tim...


    pub_type: 杂志文章


    authors: Bernays EA,Cornelius ML

    更新日期:1989-05-01 00:00:00

  • Interseasonal comparison of CO2 concentrations, isotopic composition, and carbon dynamics in an Amazonian rainforest (French Guiana).

    abstract::Canopy CO2 concentrations in a tropical rainforest in French Guiana were measured continuously for 5 days during the 1994 dry season and the 1995 wet season. Carbon dioxide concentrations ([CO2]) throughout the canopy (0.02-38 m) showed a distinct daily pattern, were well-stratified and decreased with increasing heigh...


    pub_type: 杂志文章


    authors: Buchmann N,Guehl JM,Barigah TS,Ehleringer JR

    更新日期:1997-03-01 00:00:00

  • Germination response to temperature, salinity, light and depth of sowing of ten tropical dune species.

    abstract::This study describes the germination responses of ten tropical dune species to several factors to which their seeds are exposed in the field. Species studied were: three sand dune endemics (Amaranthus greggii, Palafoxia lindenii, and Trachypogon gouini), three pantropical coastal species (Sesuvium portulacastrum, Spor...


    pub_type: 杂志文章


    authors: Martínez ML,Valverde T,Moreno-Casasola P

    更新日期:1992-12-01 00:00:00

  • Direct and indirect interactions between ants (Pheidole megacephala), scales (Coccus viridis) and plants (Pluchea indica).

    abstract::This study investigated direct and indirect interactions between the ant, Pheidole megacephala (Fabr.), the green scale, Coccus viridis (Green), and the scale's host plant, Pluchea indica (L.). To examine the influence of ants on scales and host plants, scale population densities, scale mortality rates, and plant perf...


    pub_type: 杂志文章


    authors: Bach CE

    更新日期:1991-07-01 00:00:00

  • Parasite load and seasonal migration in red deer.

    abstract::Northern deer populations are typically partially migratory, but the relationship between migratory movements and parasites has received little attention. Migration often involves movement from a low-elevation winter range towards a summer range at higher elevation. In Europe these movements may also involve a gradien...


    pub_type: 杂志文章


    authors: Mysterud A,Qviller L,Meisingset EL,Viljugrein H

    更新日期:2016-02-01 00:00:00

  • The production of Cyprideis torosa Jones 1850 (Crustacea, Ostracoda).

    abstract::The ostracod Cyprideis torosa Jones, 1850 is a dominant species in the meiofauna of brackish water habitats. Its production in the field over a five-year period has been calculated using two production models. The first model uses the age-distribution of shells preserved in the sediment to assess the stage-specific mo...


    pub_type: 杂志文章


    authors: Herman PM,Heip C,Vranken G

    更新日期:1983-06-01 00:00:00

  • Experimental evidence that herbivory increases shoot density and productivity in a subtropical turtlegrass (Thalassia testudinum ) meadow.

    abstract::The sea urchin, Lytechinus variegatus, has been estimated to consume between 50 and 90% of annual net aboveground production in selected turtlegrass (Thalassia testudinum) meadows in the eastern Gulf of Mexico. Nevertheless, turtlegrass persists where sea urchin grazing is intense. We hypothesized that turtlegrass pro...


    pub_type: 杂志文章


    authors: Valentine JF,Heck KL,Busby J Jr,Webb D

    更新日期:1997-10-01 00:00:00

  • Life history plasticity does not confer resilience to environmental change in the mole salamander (Ambystoma talpoideum).

    abstract::Plasticity in life history strategies can be advantageous for species that occupy spatially or temporally variable environments. We examined how phenotypic plasticity influences responses of the mole salamander, Ambystoma talpoideum, to disturbance events at the St. Marks National Wildlife Refuge (SMNWR), FL, USA from...


    pub_type: 杂志文章


    authors: Davis CL,Miller DA,Walls SC,Barichivich WJ,Riley J,Brown ME

    更新日期:2017-03-01 00:00:00

  • Oxygen loss from Spartina alterniflora and its relationship to salt marsh oxygen balance.

    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...


    pub_type: 杂志文章


    authors: Howes BL,Teal JM

    更新日期:1994-05-01 00:00:00

  • Metapopulation dynamics over 25 years of a beetle, Osmoderma eremita, inhabiting hollow oaks.

    abstract::Osmoderma eremita is a species of beetle that inhabits hollows in ancient trees, which is a habitat that has decreased significantly during the last century. In southeastern Sweden, we studied the metapopulation dynamics of this beetle over a 25 year period, using capture-mark-recapture. The metapopulation size had be...


    pub_type: 杂志文章


    authors: Lindman L,Larsson MC,Mellbrand K,Svensson GP,Hedin J,Tranberg O,Ranius T

    更新日期:2020-12-01 00:00:00

  • Feeding in the rotifer Brachionus calyciflorus : I. Regulatory Mechanisms.

    abstract::Feeding behavior in B. calyciflorus was observed in both constrained and unconfined individuals. There are at least three mechanisms by which the ingestion of suspended particles may be regulated. First, the cirri of the pseudotrochus may be extended, allowing particles to enter the funnel-shaped buccal field, or they...


    pub_type: 杂志文章


    authors: Gilbert JJ,Starkweather PL

    更新日期:1977-06-01 00:00:00

  • Do key dimensions of seed and seedling functional trait variation capture variation in recruitment probability?

    abstract::Seedling recruitment is a critical driver of population dynamics and community assembly, yet we know little about functional traits that define different recruitment strategies. For the first time, we examined whether trait relatedness across germination and seedling stages allows the identification of general recruit...


    pub_type: 杂志文章


    authors: Larson JE,Sheley RL,Hardegree SP,Doescher PS,James JJ

    更新日期:2016-05-01 00:00:00

  • Interactions between the leech Glossiphonia complanata and its gastropod prey.

    abstract::Predator-prey interactions between the predatory leech, Glossiphonia complanata, and its gastropod prey were investigated in laboratory experiments, including behavioural observations with the aid of time-lapse video technique. Six gastropod species were investigated, viz. Lymnaea peregra, Planorbis planorbis, Physa f...


    pub_type: 杂志文章


    authors: Brönmark C,Malmqvist B

    更新日期:1986-05-01 00:00:00

  • Ecosystem-level evidence for top-down and bottom-up control of production in a grassland stream system.

    abstract::Ecosystem-wide effects of introduced brown trout (Salmo trutta L.) and native river galaxias (Galaxiaseldoni McDowall) were studied by analysing ecosystem production budgets for two adjacent tributaries of a grassland stream-system in the South Island of New Zealand. One tributary was inhabited by brown trout, the oth...


    pub_type: 杂志文章


    authors: Huryn AD

    更新日期:1998-06-01 00:00:00

  • The influence of omnivorous elaterid larvae on the microbial carbon cycle in different forest soils.

    abstract::Data are presented on the influence of Athous subfuscus larvae (Coleoptera, Elateridae) on the microbial carbon cycle in the biotically most active horizons of three contrasting beech forest soils: the Ah horizon of a mull soil on limestone (Göttinger Wald, FRG), the F/H horizon of a moder soil on new red sandstone (S...


    pub_type: 杂志文章


    authors: Wolters V

    更新日期:1989-08-01 00:00:00

  • Adaptive plasticity of egg size in response to competition in the cowpea weevil, Callosobruchus maculatus (Coleoptera: Bruchidae).

    abstract::Life history theory predicts that larger propagules should be produced when the offspring are expected to experience intense competition. This study tested whether female cowpea weevils responded to high larval or adult density by producing larger eggs. In a splitbrood design I measured the effect of density experienc...


    pub_type: 杂志文章


    authors: Kawecki TJ

    更新日期:1995-04-01 00:00:00

  • Experimental disturbance and the maintenance of species diversity in a stream community.

    abstract::In order to test the role of disturbance and the effects of disturbance frequency on stream communities, an experiment was conducted in New Hope Creek, North Carolina, USA. Patches of cobbles were tumbled 0, 1 or 2 times in a 6 week span. These tumbling disturbances lasted only 30 seconds. The recovery of the macroinv...


    pub_type: 杂志文章


    authors: Reice SR

    更新日期:1985-08-01 00:00:00

  • Dung beetles in an avian-dominated island ecosystem: feeding and trophic ecology.

    abstract::Globally, dung beetles (Scarabaeidae: Scarabaeinae) are linked to many critical ecosystem processes involving the consumption and breakdown of mammal dung. Endemic New Zealand dung beetles (Canthonini) are an anomaly, occurring at high abundance and low diversity on an island archipelago historically lacking terrestri...


    pub_type: 杂志文章


    authors: Stavert JR,Gaskett AC,Scott DJ,Beggs JR

    更新日期:2014-09-01 00:00:00