caa a22 4500 469060816 CHVBK 20180323132856.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF01200568 doi (NATIONALLICENCE)springer-10.1007/BF01200568 Dynamics of Panonychus ulmi and Typhlodromus pyri [Elektronische Daten] factors contributing to persistence [Sandra Walde, Jan Nyrop, J. Hardman] We addressed the question of persistence of predator and prey in a biological control system by examining temporal patterns ofPanonychus ulmi (Koch) and its predator,Typhlodromus pyri Scheuten at two geographic locations and at two spatial scales. At the scale of an orchard, bothP. ulmi andT. pyri were persistent over the time frame of 6 years. At the scale of an individual tree,T. pyri appeared to be more persistent than its prey,P. ulmi. We used a simulation model of single populations ofP. ulmi andT. pyri to determine which of several aspects of the biology of the two species could contribute to such a pattern. Spatial incongruity between predator and prey was essential for persistence of both species. The generalist food habit ofT. pyri probably contributes to the persistence ofT. pyri on individual trees, and may cause occasional extinction ofP. ulmi at this spatial scale. The presence of alternate food is likely an essential element for successful biological control in this system. Cannibalism byT. pyri results in higher prey densities, that is, it is detrimental to the biological control ofP. ulmi, but has no effect on the relative persistence of the two species. Elsevier Science Publishers B.V., 1992 Walde Sandra Department of Biology, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut Nyrop Jan Department of Entomology, New York State Agricultural Experiment Station, Geneva, NY, USA aut Hardman J. Agriculture Canada Research Station, Kentville, N.S., Canada aut Experimental & Applied Acarology Kluwer Academic Publishers 14/3-4(1992-06-01), 261-291 0168-8162 14:3-4<261 1992 14 10493 https://doi.org/10.1007/BF01200568 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01200568 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Walde Sandra Department of Biology, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut NATIONALLICENCE 700 1- Nyrop Jan Department of Entomology, New York State Agricultural Experiment Station, Geneva, NY, USA aut NATIONALLICENCE 700 1- Hardman J. Agriculture Canada Research Station, Kentville, N.S., Canada aut NATIONALLICENCE 773 0- Experimental & Applied Acarology Kluwer Academic Publishers 14/3-4(1992-06-01), 261-291 0168-8162 14:3-4<261 1992 14 10493 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer