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• W1541320621 abstract "Summary 1. Competition among conspecifics of the same cohort has been traditionally thought to be a main process driving population dynamics. In this classical view, however, the role of facilitation in stressful conditions has rarely been considered. Here, using a transplant experiment across a forest–prairie gradient, we test whether the stress gradient hypothesis (SGH) extends to individuals thought to be strongly competing. 2. We transplanted 2‐year‐old seedlings of Nothofagus pumilio at two different densities (clusters of 10 and isolated) and at different distances from the forest edge (from 30 m inside the forest up to 50 m outside the forest in the prairie). We further stem‐mapped all seedlings belonging to the clusters and computed a competition index (CI). After 3 years of growing, survival and increment growth in diameter and height were measured and analysed using mixed‐effects models. We conducted a nearest‐neighbour analysis using seedlings’ CI and growth and computed model fit using the area under the curve (AUC) method. 3. Seedlings planted in dense clusters had significantly higher survival than solitary seedlings at the stressful end of the gradient. This trend was reversed at the opposite end of the gradient, supporting the SGH at the intraspecific level. Pursuing this at the level of the individual, we found that higher CIs (more neighbours) in seedlings predicted higher probabilities of their survival (facilitation) in stressful conditions. 4. Seedlings diameter and height increment growth were not affected by planting density and only diameter varied along the stress gradient; seedlings had higher diameter increments in growth outside the forest. Finally, when compared with conceptual models, our results mostly support predictions of a higher facilitation at intermediate position along the gradient. 5. Synthesis . We showed that facilitation overrides competition among tree seedlings even at locations under moderate stress; the facilitation process occurs in resource‐mediated interactions (niche overlapping). These results represent an important shift in our way to understand the density‐dependent mortality process, and calls for a model reformulation including positive interactions even when competition is expected to be strongest (conspecifics of the same cohort)." @default.
• W1541320621 created "2016-06-24" @default.
• W1541320621 creator A5001421431 @default.
• W1541320621 creator A5080102797 @default.
• W1541320621 date "2010-12-22" @default.
• W1541320621 modified "2023-10-18" @default.
• W1541320621 title "Under strong niche overlap conspecifics do not compete but help each other to survive: facilitation at the intraspecific level" @default.
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• W1541320621 doi "https://doi.org/10.1111/j.1365-2745.2010.01771.x" @default.
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