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194 results for “Competitive effect”
Priority effects can be explained by competitive traits
<p>Code (updated after review)</p> <p>Traits - Trait values that were measurent and calculated from the individuals grown alone (updated after review).</p> <p>See version 2 for other files </p>
Replication files for: Strongmen Cry Too: The Effect of Aerial Bombing on Voting for The Incumbent in Competitive Autocracies
<p>The NATO bombing of Yugoslavia, which lasted from March 24, 1999 until June 10, 1999, was the largest air campaign in Europe since the bombing of Britain and Germany in World War II. The air raids lasted for 78 days and hit 108 out of 160 municipalities, excluding Kosovo and Montenegro. The bombing was spread out and largely aimed at military barracks, industrial facilities, transportation networks, and communication lines. This repo provides a novel dataset with information on over 1,000 targets in the Federal Republic of Yugoslavia, including the date, location, target type, and fatalities. Included is also R code for the replication of my article "Strongmen Cry Too: The Effect of Aerial Bombing on Voting for The Incumbent in Competitive Autocracies" that was accepted for publication at Journal of Peace Research.</p>
Data from: Synergistic effects of grass competition and insect herbivory on the weed Rumex obtusifolius in an inundative biocontrol approach
<p>Data are from a field experiment to test for synergistic interactions between grass competition and herbivory on <i>Rumex obtusifolius</i>, a prominent weed in temperate grasslands worldwide.</p><p><i>Rumex obtusifolius</i> was grown in the presence and absence of competition from the grass <i>Lolium perenne</i> and subjected to herbivory through targeted inoculation with root-boring <i>Pyropteron</i> spp.</p><p>To explore whether the interactive effects of competition and herbivory were size-dependent, <i>R. obtusifolius</i> was planted covering a large range of plant sizes found in managed grasslands.</p><p>The experimental layout followed a split-split plot design. Main-level factor was <i>L. perenne</i> competition, split-level factor was herbivory application, split-split-level factor was initial root mass of <i>R. obtusifolius</i>. Main-plots were arranged according to a randomized complete block design on the site (8 blocks, each containing a <i>L. perenne</i> competition and a no competition treatment).</p>
Relyea, R. A. 2000. Trait-mediated indirect effects in larval anurans: Reversing competition with the threat of predation. Ecology 81:2278-2289.
Ecologists recently have been focusing on the role that trait-mediated indirect effects can have on community structure and composition. To date, this work has primarily focused on the effects of predator-induced behavioral plasticity on communities. However, predator-induced morphological plasticity, which has been documented in many taxa, might also lead to trait-mediated indirect effects. Here, I examined how predators altered the behavior and morphology of larval wood frogs (Rana sylvatica) and leopard frogs (R. pipiens) and how these phenotypic changes altered the outcome of competition between the two species. Competition in the absence of caged predators was asymmetric; when reared separately, leopard frogs grew more than wood frogs, but when competing (without predators), wood frogs grew faster than leopard frogs. The presence of caged predators reversed the outcome of competition between the two anuran prey. In the presence of larval dragonflies (Anax spp.) or caged mudminnows (Umbra limi), leopard frogs grew faster than wood frogs while total tadpole biomass production remained unchanged. Thus, there was a predator-mediated indirect effect. Because predators alter both the behavior and morphology of larval anurans and both of these traits are known to affect resource consumption and growth, both are potential mechanisms to explain the change in competitive outcome. Changes in behavior were not related to changes in growth, but changes in morphology (specifically mouth width and tail length) were related to changes in growth. When competitors were added (without predators), wood frogs increased their mouth width by 10% and their tail length by 3%, while leopard frogs increased their mouth width by 5% and did not change their tail length. The greater increase in mouth width for wood frogs should increase their forage intake, since tadpoles feed by scraping periphyton; the importance of a 3% longer tail in competitive ability is unknown. The presence of the p
Drought and herbivory effects on woody plant seedling establishment and grass competition in the Jornada Basin, 2016-2018
This dataset contains observations of seedling establishment and grass competition under precipitation manipulations, and herbivory and granivory exclosure treatments, in the Chihuahuan desert of southern New Mexico, USA. The experiment took place at the Jornada Basin LTER site. We used a rainfall manipulation system and various herbivore exclosures in a factorial design, to test hypotheses about how precipitation (PPT), competition between grasses and shrub seedlings, and predation affect the germination and first-year survival of Mesquite (Prosopis glandulosa), a shrub that has encroached in Southern Great Plains and Chihuahuan Desert grasslands. Data collected in these files include seedling counts in each treatment over observation years 2016 to 2018. This data supports the related publication in Ecological Applications (Weber-Grullon et al. in press). The dataset is complete.
Dataset and Jupyter worksheet interpreting the (results from) small- and wide-angle scattering data from a series of boehmite/epoxy nanocomposites. Accompanies the publication "Competition of nanoparticle-induced mobilization and immobilization effects on segmental dynamics of an epoxy-based nanocomposite"
<p>Dataset and Jupyter worksheet interpreting the (results from) small- and wide-angle scattering data from a series of boehmite/epoxy nanocomposites. Accompanies the publication "Competition of nanoparticle-induced mobilization and immobilization effects on segmental dynamics of an epoxy-based nanocomposite", by Paulina Szymoniak, Brian R. Pauw, Xintong Qu, and Andreas Schönhals.</p> <p>Datasets are in three-column ascii (processed and azimuthally averaged data) from a Xenocs NanoInXider SW instrument. Monte-Carlo analyses were performed using McSAS 1.3.1, other analyses are in the Python 3.7 worksheet. Graphics and result tables are output by the worksheet. </p>
Data and code from: The functional form of specialized predation affects whether Janzen-Connell effects can prevent competitive exclusion
<p><span>Janzen</span><span>-</span><span>Connell</span><span> Effects (</span><span>JCEs</span><span>), specialized </span><span>predation</span><span> of seeds and seedlings near </span><span>conspecific</span><span> trees, are hypothesized to maintain species richness. While previous studies show </span><span>JCEs</span><span> can maintain high richness relative to neutral communities, recent theoretical work indicates </span><span>JCEs</span><span> may weakly inhibit competitive exclusion when species exhibit inter-specific fitness variation. However, recent models make somewhat restrictive assumptions about the functional form of specialized </span><span>predation</span><span> -- that </span><span>JCEs</span><span> occur at a fixed rate when offspring are within a fixed distance of a </span><span>conspecific</span><span> tree. Using a theoretical model, I show that the functional form of </span><span>JCEs</span><span> largely impacts their ability to maintain coexistence. If </span><span>predation</span><span> pressure increases </span><span>additively</span><span> with adult tree density and decays exponentially with distance, </span><span>JCEs</span><span> maintain considerably higher species richness than predicted by recent models. Loosely </span><span>parameterizing</span><span> the model with data from a Panamanian tree community, I elucidate the conditions under which </span><span>JCEs</span><span> are capable of maintaining high species richness. </span></p>
A general approach for quantifying microbial effects on plant competition
<p>Purpose <br>A growing perspective in plant ecology highlights the ways that microbial interactions can promote or hinder plant coexistence. Towards this aim, recently-proposed approaches provide ways to empirically quantify how microbes affect the outcome of competition between plants. One such approach experimentally measures competition coefficients by comparing biomass performance of plants growing individually or with competitors, then quantifies microbial effects by comparing with a sterilization treatment. Nonetheless, the complexity of plant-microbe interactions presents general challenges when linking observations of microbial effects to underlying models.</p> <p>Results <br>We show how the implementation of a density gradient design can help quantify potential nonlinearities and facilitative interactions in plant-soil microbe interactions, which are properties once thought to hinder the quantification of the microbial impact of plant competitive outcome. We provide guidelines for setting up the experiment and accurately interpreting the results.</p> <p>Conclusion <br>We argue that future studies should aim to parameterize suitable demographic models to characterize the contribution of soil microbes to plant coexistence. </p>
Data from: Opposing effects of competition and selection on macroevolutionary dynamics
<p>The diversity of species and traits is the outcome of multiple evolutionary processes operating over millions of years. These processes affect rates of trait evolution, speciation, and extinction. A key problem is identifying the relative importance of distinct processes in driving observed patterns in species traits and phylogenetic trees. Here, we show how two processes, competition and stabilising selection, can act opposingly but still leave identifiable traces in macroevolutionary data. Building on previous simulation studies, we model the joint influence of competition and stabilising selection on rates of trait evolution, speciation completion, and extinction. We find that opposing effects result in nuanced patterns of trait evolution and diversification dynamics that, when considered in isolation, could easily lead to misinterpretation. In particular, while the best fitting likelihood model of trait evolution is typically Brownian motion when competition and stabilising selection act simultaneously, we find stronger phylogenetic signal than expected under BM and trait distributions that are distinctly platykurtic. Taken together, we suggest that by considering multiple simple metrics measuring trait evolution and diversification dynamics it may be possible, though challenging, to identify the relative contribution of these two processes operating together in macroevolutionary data.</p>
Data for: Effect of heterospecific and conspecific competition on individual differences in tadpole behavior
<p>Repeated social interactions with conspecifics and/or heterospecifics during early development may drive the differentiation of behaviour among individuals. This behavioural differentiation may occur through individuals behaving more different from each other on average and/or individuals behaving more consistently. Competition is a major form of social interaction and its impacts can depend on whether interactions occur between conspecifics or heterospecifics and the directionality of a response could be specific to different behavioural traits. To test this, we reared tungara frog tadpoles (<em>Engystomops pustulosus</em>) either in isolation, with a conspecific tadpole or with an aggressive heterospecific tadpole, the whistling frog tadpole, <em>Leptodactylus fuscus</em>. In each treatment, we measured the body size, activity, exploration and risk taking in the presence of a predator in focal <em>E. pustulosus</em> tadpoles six times during development. We used univariate and multivariate hierarchical mixed effect models to investigate the effect of treatment on mean behaviour and on among individual variance between and within individuals across behavioural traits. There was a strong effect of competition on behaviour, with different population and individual level responses across social treatments. Within their home tank, individuals were more consistent in their movements under conspecific competition but heterospecific competition caused more variance in the average movement among individuals. Behavioural responses were also trait specific as conspecific competition caused greater variability in movements among individuals in a novel environment. The results highlight that the impact of competition on inter-individual differences in behaviour is dependent on competitor species identity and is trait specific. Keywords: animal personality, competition, conspecific, heterospecific, individual differences, variance partitioning.</p>
Data for: Hardwoods influence effect of climate and intraspecific competition on growth of woodland longleaf pine trees
<p>Longleaf pine woodlands of the North American Coastal Plain are proposed to be resilient to climate change impacts, but little is known about changes in limiting factors to longleaf pine growth as climate has changed in the late 20<sup>th</sup> and early 21<sup>st</sup> centuries. Moreover, the role that neighborhood trees play in the context of climate change remains largely unexplored. We used static and moving-window tree-ring and climatic analyses to measure the effects of climate on longleaf pine growth at a site in southwest Georgia, USA. We then performed maximum likelihood analysis to examine the influence of neighboring hardwoods on the response of longleaf pine growth to the joint effects of competition and climate. Analysis of climate data from local stations in southwest Georgia over six decades indicated that mean air temperature decreased until the late 20<sup>th </sup>century and then began to rise, and that the variability of spring and summer precipitation has increased. Tree ring and climate analyses indicated longleaf pine radial growth is sensitive to precipitation and air temperature, and that the strength of correlation of longleaf pine growth to summer air temperature and summer precipitation increased since the 1950s. Likelihood models, which were applied over a shorter (23-year) period and explicitly incorporated competition, did not support a link between summer temperature and growth but did indicate summer precipitation increased growth. Furthermore, basal area of neighboring hardwoods was correlated with greater pine growth per millimeter of precipitation. Basal area of neighboring longleaf pine negatively affected the growth of conspecific trees; the presence of hardwoods increased the competitive effect when basal area of neighboring pine trees was low (<10 m<sup>2</sup> ha<sup>-1</sup>) but decreased the competitive effect when basal area of neighboring pine trees was high (≥ 10 m<sup>2</sup> ha<sup>-1</sup>). These results suggest that retention or recruitment of hardwood trees when restoring longleaf pine woodlands may contribute to increased ability to withstand dry summers and may help to allay concerns of managers that retention of hardwoods will unduly affect the growth of residual mature longleaf pines.</p>
Male sexual signaling and expected effects of hatchery-induced sperm competition vary with water depth at which whitefish are caught
<div> <div> <div> <div> <p>Salmonids like whitefish (<em>Coregonus</em> spp.) are often propagated in supportive breeding. Spawners are caught from their spawning locations, their gametes mixed, and the resulting offspring reared in a protected environment before being released into the wild. This procedure can affect sexual selection, for example, by enhancing the importance of sperm competition or by reducing the relevance of sexual signals. While it is often unclear how sperm competitiveness is affected by a male's overall genetic quality, there is accumulating evidence that sexual signals reveal good genes and that mate choice based on such signals can increase offspring viability (Auld et al. 2019). Therefore, supportive breeding may affect the genetic variance and the mean genetic quality of next generations. We sampled whitefish from various locations along a depth gradient to test how male characteristics that are likely to affect sexual selection under natural conditions correlate with characteristics that affect hatchery-induced sperm competition. Whitefish are external fertilizers, and multi-male spawning and hence sperm competition is common under natural conditions. Mate choice is not sufficiently understood but could be based on breeding tubercles. These are small conical structures that grow on scales before the breeding sea- son and fall off shortly afterwards. The size of breeding tubercles varies much among males and has repeatedly been found to correlate positively with offspring viability (Wedekind et al. 2001; Keka ̈la ̈inen et al. 2010). Male dominance is typically depend- ent on body size (Auld et al. 2019) and could also be relevant in whitefish. Body size itself can reflect individual inbreeding coefficients (Su et al. 1996) and be an indicator of heritable genetic quality in small or structured populations (Neff and Pitcher 2008). In another fish with a somewhat comparable mating system, the size of breeding tubercles and male size was not correlated but could both be used to predict male reproductive success under close to natural conditions (Jacob et al. 2009). We study whitefish from Lake Hallwil (Switzerland). This lake has suffered so much from anthropogenic eutrophication that it is being artificially aerated since 1985. Three hatcheries around the lake are likely to have played a key role in maintaining the whitefish population, as concluded also from a recent mark–recapture experiment (Vonlanthen 2015). However, eutrophication combined with possible hybridization in hatcheries can have led to a speciation reversal (Vonlanthen et al. 2012) and may thereby have destroyed any genetic structure linked to water depth. Hatchery protocols now focus on maintaining over-all genetic variance by pooling milt of many males before adding the mix to eggs of multiple females. Milt volume varies among sires, for example, because males often lose milt when being pulled up from deep locations (Figure 1), an effect that likely depends on how much the swim bladder is inflated by the change in pressure. This variance in milt volume is likely to affect the genetic variance that, in combination with the average genetic quality, may then affect the long-term survival of a population. The extent to which hatchery protocols affect genetic quality can be estimated by the correlations between male quality indicators and traits that affect hatchery-induced sperm competition, that is, sperm number, velocity, and longevity (summarized here as "milt potency," see also Supplementary Material). Many breeding protocols are likely to promote genetic quality if male attractiveness or dominance are positively correlated to milt potency. If there are no such correlations or negative ones because of life-history trade-offs, hatchery-induced sperm competition is likely to reduce the average genetic quality in future generations. We sampled fish from various depths and determined their age, size, breeding ornamentation, and milt potency (see methods in the Supplementary Material) to test whether and how different male characteristics affect reproductive success in supportive breeding in a heavily managed population.</p> </div> </div> </div> </div>
Data and reproducible code for Honor et al: Direct and indirect fitness effects of competition limit evolution of allelopathy in an invading plant
<p><span>Upon introduction to new continents, invading species encounter novel communities of consumers, pathogens, and competitors. Both phenotypic plasticity and rapid evolution can facilitate adaptation across these heterogenous communities, facilitating further invasion. However, the rate and extent of adaptive evolution on contemporary timescales can be constrained by phenotypic plasticity and limits imposed by genetic co-variation for traits under selection.</span></p> <p><span>We measured phenotypic plasticity and quantified genetic co-variation for growth, competition, and fitness among </span>23 naturally inbred seed families <span>of <em>Alliaria petiolata</em> (garlic mustard) </span>collected across its invasive range in eastern North America. After growing a self-pollinated generation in a uniform common garden to reduce maternal effects, we reared second-generation plants in a <span>two-year greenhouse and field experiment with naïve soil from an uninvaded habitat. W</span>e measured selection gradients and lifetime fitness when reared alone, with an intraspecific competitor, and under interspecific competition with naïve <em>Acer saccharum </em>(sugar maple) saplings.</p> <p>Total glucosinolate production was strongly correlated with the production of chlorophyll a (Chl a) (<em>R<sup>2</sup></em> = 0.45) such that first principal component (PC1) accounted for 84% of variation in these two traits. Furthermore, PC1 exhibited high plasticity across growing environments (p < 0.001) with limited broad-sense heritability (<em>H<sup>2</sup> </em>= 2.91; p = 0.08). In contrast, investment in glucosinolate production relative to Chl a (PC2) was significantly heritable (<em>H</em><sup><em>2</em> </sup>=16.91, p < 0.001) with minimal plasticity across treatments. Causal analysis revealed that plastic variation for higher Chl a + glucosinolate production (PC1) had an indirect positive effect on A. petiolata fitness via a direct, negative effect on <em>A. saccharum</em> performance. In contrast, heritable variation for higher glucosinolate investment (PC2) had a direct, positive effect on <em>A. saccharum</em> performance and an indirect negative effect on A. petiolata fitness. </p> <p>Applying causal inference, we find that evolution of allelopathy in <em>A. petiolata</em> has been constrained by (i) a lack of genetic variation, (ii) selection against glucosinolate investment under interspecific competition, and (iii) phenotypic plasticity. These factors limit adaptive evolution but maintain fitness during population growth as plants switch from interspecific to intraspecific competition during invasion.</p>
Alien plant fitness is limited by functional trade-offs rather than a long-term increase in competitive effects of native communities
<p><span>Alien plants experience novel abiotic conditions and interactions with native communities in the introduced area. Intra- and interspecific selection on functional traits in the new environment may lead to increased population growth with time since introduction (residence time). However, selection regimes might differ depending on the invaded habitat. Additionally, in high-competition habitats, a build-up of biotic resistance of native species due to accumulation of eco-evolutionary experience to aliens over time may limit invasion success. We tested if the effect of functional traits and the population dynamics of aliens depends on interspecific competition with native plant communities. We conducted a multi-species experiment with 40 annual Asteraceae that differ in residence time in Germany. We followed their population growth in monocultures and in interspecific competition with an experienced native community (varying co-existence times between focals and community). To more robustly test our findings, we used a naïve community that never co-existed with the focals. We found that high seed mass decreased population growth in monocultures but tended to increase population growth under high interspecific competition. We found no evidence for a build-up of competition-mediated biotic resistance by the experienced community over time. Instead, population growth of the focal species was similarly inhibited by the experienced and naïve community. By</span><span> comparing the effect of experienced and naïve communities on population dynamics over two years across a large set of species with a high variation in functional traits and residence time, </span><span>this study advances the understanding of the long-term dynamics of plant invasions. I</span><span>n our study system, population growth of alien species was not limited by</span> <span>an increase of competitive effects by native communities (one aspect of biotic resistance) over time. </span><span>Instead, invasion success of alien plants may be limited because initial spread in low-competition habitats requires different traits than establishment in high-competition habitats. </span></p>
Stage-mediated priority effects and season lengths shape long-term competition dynamics
<p>The relative arrival time of species can affect their interactions and thus determine which species persist in a community. Although this phenomenon, called priority effect, is widespread in natural communities, it is unclear how it depends on the length of growing season. Using a seasonal stage-structured model, we show that differences in stages of interacting species could generate priority effects by altering the strength of stabilizing and equalizing coexistence mechanisms, changing outcomes between exclusion, coexistence, and positive frequency dependence. However, these priority effects are strongest in systems with just one or a few generations per season and diminish in systems where many overlapping generations per season dilute the importance of stage-specific interactions. Our model reveals a novel link between the number of generations in a season and the consequences of priority effects, suggesting that consequences of phenological shifts driven by climate change should depend on specific life histories of organisms.</p>
Data from: Opposing effects of competition and selection on macroevolutionary dynamics
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Alien plant fitness is limited by functional trade-offs rather than a long-term increase in competitive effects of native communities
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Data and reproducible code for Honor et al: Direct and indirect fitness effects of competition limit evolution of allelopathy in an invading plant
Open the record for dataset details and reuse information.
Male sexual signaling and expected effects of hatchery-induced sperm competition vary with water depth at which whitefish are caught
Open the record for dataset details and reuse information.
Data for: Hardwoods influence effect of climate and intraspecific competition on growth of woodland longleaf pine trees
Open the record for dataset details and reuse information.
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