caa a22 4500 469060891 CHVBK 20180323132856.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF01200569 doi (NATIONALLICENCE)springer-10.1007/BF01200569 Transtrophic interactions in cassava [Elektronische Daten] [Frank Bakker, Martha Klein] Cassava plants exude phloem saps at the base of the petioles of the youngest leaves. The effect of these nutrient-rich droplets on the interaction between the predatory miteTyphlodromalus limonicus and the herbivorous miteMononychellus tanajoa was investigated in a semi-field setting. These two organisms were chosen as a model system due to their strong association with cassava. The hypothesis that exudate production can be considered in terms of extrinsic defense was tested experimentally. Because non-producing clones could not be found exudate production was mimicked (or not) by applying honey droplets on the petioles of plants from which exuding plant parts were aborted. The experiments indicated that: (1) The presence of exudate on otherwise clean plants does not prevent extinction of the predator population, but the rate of population decrease is consistently lower than when no exudate is present. (2) When a second food source enables the predators to reproduce, higher population densities are always attained when the sugar source is also present. (3) Higher predator numbers invariably coincide with lower herbivore abundance. (4) Lower prey abundance does not lead to a reduction in egg production when honey is present. (5) Presence of honey leads to enhanced juvenile/adult survival or reduced emigration and thus to a higher number of female predators. In interpreting the results careful attention was paid to the effect of cassava mildew because spores of this fungus were shown to be an adequate food alternative for the predator under study. The presence of this mildew (Oidium manihoti) hampered straightforward interpretation of some experiments but left the main conclusions unaltered. Elsevier Science Publishers B.V., 1992 Bakker Frank Department Pure and Applied Ecology, Section Population Biology, University of Amsterdam, Kruislaan 302, 1098 SM, Amsterdam, Netherlands aut Klein Martha Department Pure and Applied Ecology, Section Population Biology, University of Amsterdam, Kruislaan 302, 1098 SM, Amsterdam, Netherlands aut Experimental & Applied Acarology Kluwer Academic Publishers 14/3-4(1992-06-01), 293-311 0168-8162 14:3-4<293 1992 14 10493 https://doi.org/10.1007/BF01200569 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01200569 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bakker Frank Department Pure and Applied Ecology, Section Population Biology, University of Amsterdam, Kruislaan 302, 1098 SM, Amsterdam, Netherlands aut NATIONALLICENCE 700 1- Klein Martha Department Pure and Applied Ecology, Section Population Biology, University of Amsterdam, Kruislaan 302, 1098 SM, Amsterdam, Netherlands aut NATIONALLICENCE 773 0- Experimental & Applied Acarology Kluwer Academic Publishers 14/3-4(1992-06-01), 293-311 0168-8162 14:3-4<293 1992 14 10493 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer