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1,316 results for “Trade”
The trait-mediated trade-off between growth and survival depends on tree sizes and environmental conditions
<p><span>Interspecific relationships between growth and survival are critical determinants of tree species diversity maintenance in forests. The trade-offs between growth and survival in co-occurring tree species are believed to arise along a continuum of life-history strategies. For example, co-occurring species range from those that grow slowly and survive well in resource-poor environments to those that grow quickly but have low survival rates in resource-rich environments. However, uncertainties remain regarding how growth-survival trade-offs are related to species traits, tree sizes, or environmental conditions.</span></p> <p><span>We examined how the relationships between species traits and growth–survival relationships shift in response to changes in stem sizes and across census periods with different climate conditions (frequency of strong winds, drought intensity) across 45 co-occurring tree species based on 23 years of growth and survival records in a warm temperate rain forest on Yakushima Island, Japan. We developed hierarchical Bayesian models of relative growth and survival rates, including leaf traits, wood density, and 95-percentile maximum stem diameter as explanatory variables. We tested the relationships between estimated trait-mediated growth–survival relationships and the intensities of climate events during five census periods.</span></p> <p><span>Each trait's effects on growth–survival relationships differed across the five census periods in response to climate conditions. Interspecific growth–survival relationships affected by a single trait axis for leaves or wood tended to be negative. In contrast, those affected by the maximum stem diameter tended to be positive. Such trends </span><span>increased with more frequent </span><span>strong winds or more intense droughts. The single-trait effects on growth–survival relationships were stronger for smaller sizes than for larger sizes. For all traits combined, we found a significant growth–survival trade-off only for small-sized stems in three of five census periods.</span></p> <p><span>Synthesis: Our results indicate that the effect of species traits on the growth–survival relationships depended on tree sizes, the census periods, or both in response to the frequency or intensity of climate events. We argue the importance of incorporating spatial and temporal variations in environmental conditions into long-term data from tree census to predict forest dynamics.</span></p>
Datasets for Universal closed-tube barcoding for monitoring the shark and ray trade in megadiverse conservation hotspots
<p>Data repository accompanying manuscript titled of "Universal closed-tube barcoding for monitoring the shark and ray trade in megadiverse conservation hotspots" by Andhika Prima Prasetyo et.al</p>
Evolving to stay the same: Life history evolution and trade-offs in response to high and low total food
<p>Food drives ecology and evolution, but few studies have directly investigated the impacts of the total amount of food on life history evolution within-species. Among the limited number of available case studies that do directly test total food effects on life history evolution we still lack consensus, partially owing to incompletely described life histories. We explored life history trade-offs across the whole lifecycle, and the consequences for trait and population dynamics, in a marine copepod evolved under high and low total food using an integral projection model (IPM). Populations were subjected to high- and low-food regimes and a common garden experiment after 30 generations of evolution. We then sampled and measured individual vital rates (growth, reproduction, and survival) from hatching until death, which were used to parameterise IPMs. Food regime had a significant but slight effect on life histories, which appeared 'slow' and 'fast' in low-food and high-food lineages respectively. Low-food lineages grew bigger and produced larger offspring to genetically compensate for their environment, but this compensation came with costs; notably shorter lifespans and less chance of producing clutches of eggs. Despite these differences, population ecology and fitness were similar in high- and low-food lineages as anticipated by per-capita rather than total food effects. Consequently, though natural planktonic populations may genetically mitigate the effects of climate-induced food scarcity, there are limits to this compensation and likely unforeseen impacts effects for wider food webs.</p>
Data from: Weak evidence of trade-offs modulated by seed mass among a guild of closely related winter annuals
<p>This is R code for addressing the following research questions:</p> <p>(1) Do species differ in their average responses to density treatments?</p> <p>(2) Does seed mass explain species' responses to increasing densities of conspecifics?</p> <p>(3) Does seed mass explain species' responses to increasing densities of both conspecifics and heterospecifics?</p>
Evolutionary signatures of a trade-off in direct and indirect defenses across the wild grape genus Vitis
<p>Evolutionary correlations between chemical defense and protection by mutualist bodyguards have been long predicted, but tests of these patterns remain rare. We use a phylogenetic framework to test for evolutionary correlations indicative of trade-offs or synergisms between direct defense in the form of plant secondary metabolism, and indirect defense in the form of leaf domatia, across 33 species in the wild grape genus, <em>Vitis</em>. We also performed a bioassay with a generalist herbivore to associate our chemical phenotypes with herbivore palatability. Finally, we tested whether defensive traits correlate with the average abiotic characteristics of each species' contemporary range and whether these correlations were consistent with plant defense theory. We found a negative evolutionary correlation between domatia size and the diversity of secondary metabolites in <em>Vitis</em> leaf tissue across the genus, and also that leaves with a higher diversity and richness of secondary metabolites were less palatable to a generalist herbivore, consistent with a trade-off in chemical and mutualistic defense investment. Predictions from plant defense theory were not supported by associations between investment in defense phenotypes and abiotic variables. Our work demonstrates an evolutionary pattern indicative of a trade-off between indirect and direct defense strategies across the <em>Vitis</em> genus.</p>
Trade-offs between Sustainable Development Goals in carbon capture and utilisation
<p>Dataset associated with the publication "Trade-offs between Sustainable Development Goals in carbon capture and utilisation" by Iasonas Ioannou, Ángel Galán-Martín, Javier Pérez-Ramírez, and Gonzalo Guillén-Gosálbez, available at <a href="https://doi.org/10.1039/D2EE01153K">https://doi.org/10.1039/D2EE01153K</a>. The dataset includes the numeric data required to plot all the figures embedded in the main manuscript.</p>
Functional traits of young seedlings predict trade-offs in seedling performance in three neotropical forests
<ol> <li>Understanding the mechanisms that promote the coexistence of hundreds of species over small areas in tropical forest remains a challenge. Many tropical tree species are presumed to be functionally equivalent shade-tolerant species that differ in performance trade-offs between survival in shade and the ability to quickly grow in sunlight.</li> <li>Variation in plant functional traits related to resource acquisition is thought to predict variation in performance among species, perhaps explaining community assembly across habitats with gradients in resource availability. Many studies have found low predictive power, however, when linking trait measurements to species demographic rates.</li> <li>Seedlings face different challenges recruiting on the forest floor and may exhibit different traits and/or performance trade-offs than older individuals face in the eventual adult niche. Seed mass is the typical proxy for seedling success, but species also differ in cotyledon strategy (reserve vs photosynthetic) or other seedling traits. These can cause species with the same average seed mass to have divergent performance in the same habitat.</li> <li>We combined long-term studies of seedling dynamics with functional trait data collected at a standard developmental stage in three diverse neotropical forests to ask whether variation in coordinated suites of traits predicts variation among species in demographic performance.</li> <li>Across hundreds of species in Ecuador, Panama, and Puerto Rico, we found seedlings displayed correlated suites of leaf, stem, and root traits, which strongly correlated with seed mass and cotyledon strategy. Variation among species in seedling functional traits, seed mass, and cotyledon strategy were strong predictors of trade-offs in seedling growth and survival.</li> <li>Our findings highlight the importance of cotyledon strategy in addition to seed mass as a key component of seed and seedling biology. These results also underscore the importance of matching the ontogenetic stage of the trait measurement to the stage of demographic dynamics.</li> <li> <em>Synthesis</em>: With strikingly consistent patterns across three tropical forests, we find strong evidence for the promise of functional traits to provide mechanistic links between seedling form and demographic performance. </li> </ol>
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>
Data from: Nutrigonometry I: using right-angle triangles to quantify nutritional trade-offs in performance landscapes
<p>Animals regulate their food intake to maximise the expression of fitness traits but are forced to trade-off optimal expression of some fitness traits due to differences in nutrient requirements of each trait ('nutritional trade-offs'). Nutritional trade-offs have been experimentally uncovered using the Geometric Framework for Nutrition (GF). However, current analytical methods to measure such responses rely on either visual inspection or complex models of vector calculations applied to multidimensional performance landscapes, making these approaches subjective, or conceptually difficult, computationally expensive, and in some cases inaccurate. Here, we present a simple trigonometric model to measure nutritional trade-offs in multidimensional landscapes (Nutrigonometry), which relies on the trigonometric relationships of right-angle triangles and thus, is both conceptually and computationally easier to understand and use than previous quantitative approaches. We apply Nutrigonometry to a landmark GF dataset for the comparison of several standard statistical models to assess model performance in finding regions in the performance landscapes. This revealed that polynomial (Bayesian) regressions can be used for precise and accurate predictions of peaks and valleys in performance landscapes, irrespective of the underlying structure of the data (i.e., individual food intakes vs fixed diet ratios). We then identified the known nutritional trade-off between lifespan and reproductive rate both in terms of nutrient balance and concentration for validation of the model. This shows Nutrigonometry enables a fast, reliable, and reproducible quantification of nutritional trade-offs in multidimensional performance landscapes, thereby broadening the potential for future developments in comparative research on the evolution of animal nutrition.</p>
R codes from: Breakdown of the growth–mortality trade-off along a soil phosphorus gradient in diverse neotropical forest
<p><span>An ecological paradigm predicts that plant species adapted to low resource availability grow slower and live longer than those adapted to high resource availability when growing together. We tested this by using hierarchical Bayesian analysis to quantify variations in growth and mortality of ~ 40,000 individual trees from > 400 species in response to limiting resources in the tropical forests of Panama. In contrast to theoretical expectations of the growth–mortality paradigm, we find that tropical tree species restricted to low-phosphorus soils simultaneously achieve faster growth rates and lower mortality rates than species restricted to high-phosphorus soils. This result demonstrates that adaptation to phosphorus limitation in diverse plant communities modifies the growth–mortality trade-off, with important implications for understanding long-term ecosystem dynamics.</span></p>
Global flows of insect transport and establishment: the role of biogeography, trade, and regulations
<p><strong><span>Aim</span></strong><span>:</span><span> Non-native species are part of almost every biological community worldwide, yet numbers of species establishments have an uneven global distribution. Asymmetrical exchanges of species between regions are likely influenced by a range of mechanisms, including propagule pressure, native species pools, environmental conditions, and biosecurity. While the importance of different mechanisms is likely to vary among invasion stages, </span><span>those occurring prior to establishment are difficult to account for. We used records of unintentional insect introductions </span><span>to test 1) whether insects from some biogeographic regions are more likely to be successful invaders, 2) whether the intensity of trade flows between regions determines how many species are intercepted and how many successfully establish, and 3) whether the variables driving invasion success differ pre- and post-introduction.</span></p> <p><strong><span>Location</span></strong><span>: </span><span>Canada, mainland USA, Hawaii, Japan, Australia, New Zealand, Great Britain, South Korea, South Africa.</span></p> <p><strong><span>Methods</span></strong><span>:</span> <span>To </span><span>disentangle processes occurring during the transport and establishment stages</span><span>, we analysed border interceptions of 8,199 insect species as a proxy for transported species flows, and lists of 2,076 established non-native insect species in eight areas.</span></p> <p><strong><span>Results</span></strong><span>: </span><span>During transport, the largest species flows generally originated from the Nearctic, Panamanian and Neotropical regions. Insects native to eight of twelve biogeographic regions were able to establish, with the largest flows of established species on average coming from the Western Palearctic, Neotropical, and Australasian/Oceanian regions.</span><span> Both the </span><span>biogeographic region of origin and trade intensity significantly influenced the size of species flows between regions during transport and establishment. The transported species richness increased with Gross National Income in the source country and decreased with geographic distance. More species were able to establish when introduced within their native biogeographic region.</span></p> <p><strong><span>Main conclusions</span></strong><span>: </span><span>Our results suggest that accounting for processes occurring prior to establishment is crucial for understanding invasion asymmetry in insects, and quantifying regional biosecurity risks.</span></p>
Assessing hybrid vigor using the thermal sensitivity of physiological trade-offs in tiger salamanders
<ol> <li>Hybridization between species affects biodiversity and population sustainability in numerous ways, many of which depend on the fitness of the hybrid relative to the parental species. Hybrids can exhibit fitter phenotypes compared to the parental lineages, and this 'hybrid vigor' can then lead to the extinction of one or both parental lines.</li> <li>In this study, we analyzed the relationship between water loss and gas exchange to compare physiological performance among three tiger salamander genotypes – the native California tiger salamander (CTS), the invasive barred tiger salamanders (BTS), and CTS x BTS hybrids across multiple temperatures (13.5°C, 20.5°C, and 23.5°C). We developed a new index of performance, the water-gas exchange ratio (WGER), which we define as the ratio of gas exchange to evaporative water loss (µL VO<sub>2</sub>/µL H<sub>2</sub>O). The ratio describes the ability of an organism to support energetically costly activities with high levels of gas exchange while simultaneously limiting water loss to lower desiccation risk. We used flow-through respirometry to measure the thermal sensitivity of metabolic rate and resistance to water loss of each salamander genotype to compare indices of physiological performance.</li> <li>We found that temperature had a significant effect on metabolic rate and resistance to water loss, with both traits increasing as temperatures warmed. Across genotypes, we found that hybrids have a higher WGER than the native CTS, owing to a higher metabolic rate despite having a lower resistance to water loss.</li> <li>These results provide greater insight into the physiological mechanisms driving hybrid vigor and offer a potential explanation for the rapid spread of salamander hybrids. More broadly, our introduction of the WGER may allow for species- or lineage-wide comparisons of physiological performance across changing environmental conditions, highlighting the insight that can be gleaned from multi-trait analysis of organism performance.</li> </ol>
Trade-off between photo-symbiosis and innate immunity influences cnidarian’s response to pathogenic bacteria
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Functional traits of young seedlings predict trade-offs in seedling performance in three neotropical forests
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Energetic trade-offs in migration decision-making, reproductive effort, and subsequent parental care in a long-distance migratory bird
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Invasive ant and trade flows from continents to countries worldwide
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Daphnia magna trade-off safety from UV radiation for food
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Life history plasticity and water use trade-offs associated with drought resistance in a clade of California jewelflowers
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Tracing 600 years of long-distance Atlantic cod trade in medieval and post-medieval Oslo using stable isotopes and ancient DNA
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Data from: Weak evidence of trade-offs modulated by seed mass among a guild of closely related winter annuals
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