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Processes maintaining weed functional diversity: weed species match local CWM values but not for all traits

AuthorsHernández Plaza, María Eva ; González-Andújar, José Luis ; Egea-Cobrero, Valle; Bastida, F.
Issue DateFeb-2019
Citation1st Meeting of the Iberian Ecological Society and XIV AEET Meeting: 304 (2019)
AbstractWeed species contribute to plant diversity in agroecosystems and the functional structure of their communities could relate to keyfunctions like crop biomass production. In non-agricultural systems, it has been suggested that under processes constraining func-tional diversity, community weighted mean values (CWM) represent the optimal local trait strategy for the given environmental con-ditions. Using a previously developed methodology, we test this idea and ask whether weed species are more likely to occur wheretheir trait values are similar to the local CWM. We recorded the number of weed individuals in 35 wheat fields (10 plots/field). Fromliterature we gathered data on traits: maximum height, SLA, functional type, growth form, life form and flowering onset and duration.Independently for each species and trait we computed the absolute difference between the species trait value and the CWM of thecommunity (computed excluding the focal species). We regressed these values against each species values of occurrence. Negativeslopes indicate species matching our expectation, positive slopes indicate species with alternative strategies. We used a random-ization procedure to test whether the number of species with significant slopes was greater than expected by random. For five traitsthere were more species with significantly negative slopes than randomly expected. Regarding life form and growth form, there werea similar number of species with negative than with positive slopes. Species representing alternative strategies to their local CWMtended to be grasses, to have higher SLA, a late flowering onset, low seed weight and a non erect growth form.
DescriptionTrabajo presentado en la 1st Meeting of the Iberian Ecological Society (SIBECOL) y la XIV AEET Meeting (Ecology: an integrative science in the Anthropocene), celebrado en Barcelona del 4 al 7 de febrero de 2019.
Appears in Collections:(IAS) Comunicaciones congresos
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