Can or did domestication occur without regular tillage?
Résumé
Weide et al. (2022) argue cereal domestication in Southwestern Asia occurred without regular recourse to tillage and sowing. Their proposed model, based on two functional botanical traits, flowering duration and, to a lesser extent, vegetative reproduction, compares the flora from modern cultivated and uncultivated wild cereal stands to archaeobotanical datasets. Their analysis then assigned samples/sites as "arable" or "non-arable". Two early pre-domestication cultivation sites, Jerf el Ahmar and Dja'de aligned more closely with "non-arable" grasslands than to modern "arable" fields. This observation led Weide et al. to suggest a new model of "pre-domestication cultivation" (PDC), sans tillage, which they saw as underpinning protracted domestication, spanning millennia. Our issues with this paper are summarized in 7 points: 1-2). key papers dealing with selection during domestication are misrepresented, and contra to Weide et al.’s citing of them, in fact propose that tillage is essential for selection of non-shattering plants, increased grain size, and other traits during domestication. 3). Their revised model for domestication focuses entirely on large grained cereals in Southwest Asia, but is incongruous with regions of the world where small seeded domesticates prevail, including East Asia where there is good archaeological evidence for tillage during the domestication process. 4). Their use of flowering duration as an indicator solely of levels of disturbance is problematic and contradicted by previous FIBS studies. 5). Previous FIBS studies on the same sites, utilizing different functional traits, contradict Weide et al.’s results. 6). The ecological categorization of individual species based on flowering duration as used in the analysis is highly flawed, further complicated by low sample size, varying levels of taxonomic identification between sites, inconsistent flowering duration given between different floras. 7). Weide et al. appear unaware of a large number of papers that place constraints on genetic selection during domestication as explaining protracted domestication.
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Commentaire | Version 2 |