2.3. Advantages of mixing species
2.3.1. Effects on stability
The idea that the species diversity of ecological communities
contributes to stability is among ecology’s most venerable
hypotheses (Frank and Naughton, 1991), but there are few
data on how those properties are associated in agroecological
systems. Biodiversity is the most obvious feature in multispecies
systems, but its real function often remains vague.
Some authors (Altieri, 1999; Swift et al., 2004) make a distinction
between planned biodiversity, principally the crops
and plant species included intentionally in the system by the
farmer, and associated diversity, i.e. soil flora and fauna, herbivores
and carnivores, decomposers, etc., that colonise the
system. Swift and Anderson (1993) proposed a comparable
classification of biodiversity in agroecosystems that distinguished
productive biota from resource biota (organisms that
2.3. Advantages of mixing species2.3.1. Effects on stabilityThe idea that the species diversity of ecological communitiescontributes to stability is among ecology’s most venerablehypotheses (Frank and Naughton, 1991), but there are fewdata on how those properties are associated in agroecologicalsystems. Biodiversity is the most obvious feature in multispeciessystems, but its real function often remains vague.Some authors (Altieri, 1999; Swift et al., 2004) make a distinctionbetween planned biodiversity, principally the cropsand plant species included intentionally in the system by thefarmer, and associated diversity, i.e. soil flora and fauna, herbivoresand carnivores, decomposers, etc., that colonise thesystem. Swift and Anderson (1993) proposed a comparableclassification of biodiversity in agroecosystems that distinguishedproductive biota from resource biota (organisms that
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