{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T00:10:45Z","timestamp":1770682245619,"version":"3.49.0"},"reference-count":101,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2023,6,2]],"date-time":"2023-06-02T00:00:00Z","timestamp":1685664000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Berry College"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>The simple leaves of deciduous forest trees in temperate zones have more irregular and asymmetric shapes than comparable non-deciduous leaves of trees in the tropics and subtropics. These shapes manifest as the irregular lobes and sinuses of temperate species of Quercus and Acer, as well as the greater bilateral asymmetry of Ulmaceae and Betulaceae, the serrated margins of many species, and the greater frequency of compound leaves generally (Fraxinus and Carya). These modifications may contribute to an early transition from laminar to turbulent flow, thus reducing the lateral movement of leaves when they drop during the onset of either winter or the dry season, or when they are simply shed for replacement. Such leaves are more likely to drop over the critical root zone than large, thin, broadly elliptic, and symmetric leaves. Here, we evaluate evidence for and against self-mulching as an explanation for differences in leaf shape between temperate and tropical forests. We suggest that the main evolutionary trade-offs are between competition for (1) light among tropical trees and temperate subcanopy trees, and (2) competition for water and soil nutrients among temperate canopy trees.<\/jats:p>","DOI":"10.3390\/sym15061198","type":"journal-article","created":{"date-parts":[[2023,6,5]],"date-time":"2023-06-05T01:53:25Z","timestamp":1685930005000},"page":"1198","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Leaf Shape and Self-Mulching by Trees: A Hypothesis"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1974-132X","authenticated-orcid":false,"given":"John H.","family":"Graham","sequence":"first","affiliation":[{"name":"Department of Biology, Berry College, Mount Berry, GA 30149, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rachel","family":"Christopher","sequence":"additional","affiliation":[{"name":"Department of Biology, Berry College, Mount Berry, GA 30149, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,6,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"535","DOI":"10.1071\/FP11057","article-title":"The evolution and functional significance of leaf shape in the angiosperms","volume":"38","author":"Nicotra","year":"2011","journal-title":"Funct. 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