The competition–dispersal trade‐off exists in forbs but not in graminoids: A case study from multispecies alpine grassland communities

Zhou, Xiaolong; Li, Chengzhi; Li, Honglin; Shi, Qingdong

doi:10.1002/ece3.4856

Cited by 6 publications

(3 citation statements)

References 73 publications

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“…In the alpine site, we found signals of symmetric competition. While some previous work suggests that facilitation can replace competitive interactions in stressful conditions (Kikvidze et al, 2005;Michalet et al, 2006), many other studies confirm our result that competitive interactions can prevail in alpine environments (Hülber et al, 2011;Klanderud, 2010;Zhou et al, 2019). In contrast to the stress-gradient hypothesis, we did not find an overall higher competition strength in the more benign subalpine site, but rather a shift to a mixture of symmetric and hierarchical competition.…”

Section: Interplay Of Assembly Processes In Mountain Grasslandscontrasting

confidence: 68%

A spatially explicit trait‐based approach uncovers changes in assembly processes under warming

et al. 2023

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The re-assembly of plant communities during climate warming depends on several concurrent processes. Here, we present a novel framework that integrates spatially explicit sampling, plant trait information and a warming experiment to quantify shifts in these assembly processes. By accounting for spatial distance between individuals, our framework allows separation of potential signals of environmental filtering from those of different types of competition. When applied to an elevational transplant experiment in the French Alps, we found common signals of environmental filtering and competition in all communities. Signals of environmental filtering were generally stronger in alpine than in subalpine control communities, and warming reduced this filter. Competition signals depended on treatments and traits: Symmetrical competition was dominant in control and warmed alpine communities, while hierarchical competition was present in subalpine communities. Our study highlights how distance-dependent frameworks can contribute to a better understanding of transient re-assembly dynamics during environmental change.

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Section: Interplay Of Assembly Processes In Mountain Grasslandscontrasting

confidence: 68%

A spatially explicit trait‐based approach uncovers changes in assembly processes under warming

et al. 2023

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“…There are two mechanisms by which seedling competitive ability is suggested to trade-off against colonisation ability, via negative relationships between seed mass and both seed number per parent, and the distance over which the seeds are likely to disperse (Eriksson & Jakobsson, 1999). As in previous studies (Skarpaas et al, 2011;Turnbull et al, 1999;Zhou et al, 2019), our focus here is to examine this latter relationship but extend the understanding of the trade-off to the biological implications for wind-dispersed species. We use a simple seed dispersal model parameterised for the wind-dispersed Pinus radiata to illustrate how the presence of a within-species trade-off between dispersal ability (colonisation) and seedling establishment (competition) could result in lower dispersal rates (Figure 1).…”

Section: Introductionmentioning

confidence: 97%

Competition–colonisation trade‐offs are found among but not within wind‐dispersed Pinus species

Wyse

Hulme

2022

Functional Ecology

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1. The competition-colonisation trade-off is recognised as a key mechanism for diversity maintenance, whereby weak competitors can avoid competition with stronger competitors due to their greater dispersal ability. To date, most theoretical and empirical work has focused on trade-offs among different species yet a within-species perspective is crucial to assess the scope for natural selection on competition-colonisation trade-offs.2. For six wind-dispersed Pinus species encompassing a wide range of seed masses, we examined whether within and among species there was evidence that heavier seeds typically disperse shorter distances but produce seedlings that are stronger competitors with a higher likelihood of successful establishment, under different treatment conditions.3. Within species, we found seedling establishment to be independent of diaspore terminal velocity (a measure of dispersal potential), which would maximise the variation in potential dispersal distances and locations reached by the seeds shed from a parent tree, and therefore the chances that some offspring will reach a favourable recruitment site. However, among Pinus species the likelihood of seedling emergence and survival was higher in species that produce heavier seeds with higher terminal velocity. 4. We found a marked competition-colonisation trade-off among all six species consistent with expectations from coexistence theory. In contrast, within species, there was no evidence of competition-colonisation trade-offs for any species, despite differences in the relationships between diaspore mass and terminal velocity. This is consistent with weak selection within species for a competitioncolonisation trade-off. The results suggest that within-species trade-offs do not influence the risk of invasive spread.

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“…Moreover, we conducted three multiple nutrient addition experiments in alpine meadow and alpine steppe communities located in the Tibetan Plateau and Tianshan Mountains, respectively. These regions are considered signi cant biodiversity hotspots in Western China and Central Asia, and highly vulnerable to environmental changes (Niu et al 2015, Zhou et al 2019). However, they have experienced serve nutrient enrichment over the past few decades.…”

Section: Introductionmentioning

confidence: 99%

Trait-dependent importance of intraspecific variation relative to species turnover in determining community functional composition following nutrient enrichment

Zhou,

Dong,

Zhang

et al. 2024

Oecologia

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Functional composition has been extensively used to study variation in community structure and maintenance of ecosystem functioning in recent years. However, the drivers of functional composition in terms of species turnover and intraspeci c trait variation (ITV) have still not been unambiguously distinguished, and the primary determining factors of those two components have not been made clear, especially under nutrient enrichment scenarios. In this study, we used a global data synthesis analysis and three multiple nutrient addition experiments conducted in two sites of alpine grassland to determine the extent to which species turnover and ITV contribute to functional composition shifts following nutrient enrichment. Our results showed that functional traits categories, but not environmental factors (fertilization type, climatic factors, soil properties and light transmittance), primarily determine the relative contributions of species turnover and ITV in driving shifts in community functional composition following nutrient enrichment. For whole plant traits (height) and leaf morphological traits (speci c leaf area (SLA) and leaf dry matter content (LDMC)), the relative extents of species turnover generally exceeded ITV in most nutrient addition treatments. However, for leaf chemical traits (leaf N content (LNC) and leaf P content (LPC)), the effects of ITV overwhelmed species turnover in almost all nutrient addition treatments. Those ndings are robust across different nutrient addition types and gradients. To our knowledge, this is the rst study to combine global data with multisite experiments to explore the drivers of shifts in community functional composition. Future research should focus on exploring the mechanism behind these patterns and linking species turnover and ITV to community assembly processes under global nutrient enrichment scenarios.

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The competition–dispersal trade‐off exists in forbs but not in graminoids: A case study from multispecies alpine grassland communities

Cited by 6 publications

References 73 publications

A spatially explicit trait‐based approach uncovers changes in assembly processes under warming

A spatially explicit trait‐based approach uncovers changes in assembly processes under warming

Competition–colonisation trade‐offs are found among but not within wind‐dispersed Pinus species

Trait-dependent importance of intraspecific variation relative to species turnover in determining community functional composition following nutrient enrichment

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