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A phosphorus threshold for mycoheterotrophic plants in tropical forests

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dc.contributor.author Sheldrake, Merlin en
dc.contributor.author Rosenstock, Nicholas P. en
dc.contributor.author Revillini, Daniel en
dc.contributor.author Olsson, På en
dc.contributor.author Wright, S. Joseph en
dc.contributor.author Turner, Benjamin L. en
dc.date.accessioned 2017-04-25T12:30:33Z
dc.date.available 2017-04-25T12:30:33Z
dc.date.issued 2017
dc.identifier.citation Sheldrake, Merlin, Rosenstock, Nicholas P., Revillini, Daniel, Olsson, På, Wright, S. Joseph, and Turner, Benjamin L. 2017. "<a href="https://repository.si.edu/handle/10088/32172">A phosphorus threshold for mycoheterotrophic plants in tropical forests</a>." <em>Proceedings of the Royal Society B: Biological Sciences</em>, 284, (1848). <a href="https://doi.org/10.1098/rspb.2016.2093">https://doi.org/10.1098/rspb.2016.2093</a>. en
dc.identifier.issn 0962-8452
dc.identifier.uri https://hdl.handle.net/10088/32172
dc.description.abstract The majority of terrestrial plants associate with arbuscular mycorrhizal (AM) fungi, which typically facilitate the uptake of limiting mineral nutrients by plants in exchange for plant carbon. However, hundreds of non-photosynthetic plant species-mycoheterotrophs-depend entirely on AM fungi for carbon as well as mineral nutrition. Mycoheterotrophs can provide insight into the operation and regulation of AM fungal relationships, but little is known about the factors, fungal or otherwise, that affect mycoheterotroph abundance and distribution. In a lowland tropical forest in Panama, we conducted the first systematic investigation into the influence of abiotic factors on the abundance and distribution of mycoheterotrophs, to ask whether the availability of nitrogen and phosphorus altered the occurrence of mycoheterotrophs and their AM fungal partners. Across a natural fertility gradient spanning the isthmus of Panama, and also in a long-term nutrient-addition experiment, mycoheterotrophs were entirely absent when soil exchangeable phosphate concentrations exceeded 2 mg P kg(-1) Experimental phosphorus addition reduced the abundance of AM fungi, and also reduced the abundance of the specific AM fungal taxa required by the mycoheterotrophs, suggesting that the phosphorus sensitivity of mycoheterotrophs is underpinned by the phosphorus sensitivity of their AM fungal hosts. The soil phosphorus concentration of 2 mg P kg(-1) also corresponds to a marked shift in tree community composition and soil phosphatase activity across the fertility gradient, suggesting that our findings have broad ecological significance. en
dc.relation.ispartof Proceedings of the Royal Society B: Biological Sciences en
dc.title A phosphorus threshold for mycoheterotrophic plants in tropical forests en
dc.type Journal Article en
dc.identifier.srbnumber 142274
dc.identifier.doi 10.1098/rspb.2016.2093
rft.jtitle Proceedings of the Royal Society B: Biological Sciences
rft.volume 284
rft.issue 1848
dc.description.SIUnit STRI en

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