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10.1002/ece3.2690

http://scihub22266oqcxt.onion/10.1002/ece3.2690
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C5395439!5395439!28428865
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suck abstract from ncbi


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pmid28428865      Ecol+Evol 2017 ; 7 (8): 2747-55
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  • Competition and facilitation structure plant communities under nurse tree canopies in extremely stressful environments #MMPMID28428865
  • Al?Namazi AA; El?Bana MI; Bonser SP
  • Ecol Evol 2017[Apr]; 7 (8): 2747-55 PMID28428865show ga
  • Nurse plant facilitation in stressful environments can produce an environment with relatively low stress under its canopy. These nurse plants may produce the conditions promoting intense competition between coexisting species under the canopy, and canopies may establish stress gradients, where stress increases toward the edge of the canopy. Competition and facilitation on these stress gradients may control species distributions in the communities under canopies. We tested the following predictions: (1) interactions between understory species shift from competition to facilitation in habitats experiencing increasing stress from the center to the edge of canopy of a nurse plant, and (2) species distributions in understory communities are controlled by competitive interactions at the center of canopy, and facilitation at the edge of the canopy. We tested these predictions using a neighbor removal experiment under nurse trees growing in arid environments. Established individuals of each of four of the most common herbaceous species in the understory were used in the experiment. Two species were more frequent in the center of the canopy, and two species were more frequent at the edge of the canopy. Established individuals of each species were subjected to neighbor removal or control treatments in both canopy center and edge habitats. We found a shift from competitive to facilitative interactions from the center to the edge of the canopy. The shift in the effect of neighbors on the target species can help to explain species distributions in these canopies. Canopy?dominant species only perform well in the presence of neighbors in the edge microhabitat. Competition from canopy?dominant species can also limit the performance of edge?dominant species in the canopy microhabitat. The shift from competition to facilitation under nurse plant canopies can structure the understory communities in extremely stressful environments.
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