By Paul Dangerfield, Andrew Austin, Graeme Baker
Presents a whole taxonomic remedy and evaluate of those wasp parasitoids in an international context.
Read or Download Biology, Ecology and Systematics of Australian Scelio: Wasp Parasitoids of Locust and Grasshopper Eggs PDF
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Extra resources for Biology, Ecology and Systematics of Australian Scelio: Wasp Parasitoids of Locust and Grasshopper Eggs
However, the progeny of a subsequent host influx in earlyJanuary 1982 was poorly parasitised (mean 11%, range 3-24, n = 3), possibly because Scelio that had emerged in late November to early December 1981 had died or were otherwise not synchronised with the later influx. A long-term study of Sfolgidusin eastern Australia (Hunter et at. 1997) indicated a recent slow decline in the level of parasitism since the early 1980s, in both the upper limit of the range as well as a lowering of the mean parasitism in all three regions studied (Fig.
In regions with conSistently high rainfall, as is found in subcoastal invasion areas, there is a greater chance for asynchronous Seelio emergence and host oviposition. This may account for the unexpectedly low parasitism in 'softer' environments. During sampling for adult Seelio associated with P. vittatum over a six year period, Baker et at. (1995) found a generally low abundance or absence of wasps. High numbers were recorded only in one season (1993-94) that had low rainfall, but which was preceded by two seasons of high rainfall.
1995), a distribution sympatric with its principal host G. musicus. In Pakistan, there are several species that have adapted to a wide range of climatic conditions and have wide distributions as a result of polyphagy. Scelio aegyptiacus parasitises eight hosts throughout its distribution, which extends from 5 to 1500 m and covers a range in mean annual temperatures of 17-27°C (Irshad et af. 1). Oligophagous species in Pakistan tend to have a limited distribution coinciding with all or part of the distribution of their hosts.