ores.IvHcL-t.s of \;ii-i()us dcKT-ec-s (if dc-loliatidn on Cyiioi^lo.^siiiii offiriiiiile i\nd Sciwiio jacnbaea were stuilietl untler favouriiblu Krowii-m conditions. Rf«n)wth was found in botli siiccics, but (.lid not o\ erc(>nipc-nsat(.-for defoliation. The physioloKical meebanisms responsible for re«ro\vtb after defoliation were found to relate eitber to an merease in net assimilation rate or to an inerease in relari\e in\estn-n-nt in abosesround parts. Tbe morpbolo^ieal meebanisn-i bebind re^rowtb mvobed an increase m leaf area ratio. In altniost eompletely defoliated plants, a combination of botb meebanisms was found. Tbe time needed to re-establisb tbe same amounl of biomass as control plants diHered between tbe species and between levels of defoliation. Tbese ditterenees in recovery tin-ie after defoliation are discussed in relation to decrees of berbivory found in natural situations.
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