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Elimination By Physical Attack of Supernumerary Larvae of Pseudeucoila Bochei Weld (Cynipidae) in Their Hosts, Larvae of Drosophila

Elimination By Physical Attack of Supernumerary Larvae of Pseudeucoila Bochei Weld (Cynipidae) in... ELIMINATION BY PHYSICAL ATTACK OF SUPERNUMERARY LARVAE OF PSEUDEUCOILA BOCHEI WELD (CYNIPIDAE) IN THEIR HOSTS, LARVAE OF DROSOPHILA by H. J. P. EIJSACKERS* and K. BAKKER (Zoological Laboratory, University of Leiden, The Netherlands) INTRODUCTION The cynipid wasp Pseudeucoila bochei Weld lays her eggs in the larvae of Drosophila species. One host larva always produces only one parasite, hence there must be some kind of mechanism which prevents super- parasitization or which eliminates supernumerary larvae within the host. BAKKER et al. (1967) found that Pseudeucoila can discriminate between non-parasitized and already parasitized larvae. However, this ability does not prevent egg-laying in already parasitized hosts when there are not sufficient non-parasitized hosts available. Hence, both super- parasitization and elimination occur. According to SALT (1961) there are four ways for elimination: 1) accidental injury, 2) selective starvation, 3) physiological suppression and 4) direct physical attack. Since in Pseudeucoila one host always produces one parasite, "accidental injury "cannot be the cause of the elimination. "Selective starvation" does not come into account either, as the elimination takes place when the host provides still plenty of food for more than one parasite larva. FISHER (1961a, b; 1963) analysed interspecific competition between Horogenes chrysostictos and http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Netherlands Journal of Zoology (in 2003 continued as Animal Biology) Brill

Elimination By Physical Attack of Supernumerary Larvae of Pseudeucoila Bochei Weld (Cynipidae) in Their Hosts, Larvae of Drosophila

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Publisher
Brill
Copyright
© 1970 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2960
eISSN
1568-542X
DOI
10.1163/002829671X00168
Publisher site
See Article on Publisher Site

Abstract

ELIMINATION BY PHYSICAL ATTACK OF SUPERNUMERARY LARVAE OF PSEUDEUCOILA BOCHEI WELD (CYNIPIDAE) IN THEIR HOSTS, LARVAE OF DROSOPHILA by H. J. P. EIJSACKERS* and K. BAKKER (Zoological Laboratory, University of Leiden, The Netherlands) INTRODUCTION The cynipid wasp Pseudeucoila bochei Weld lays her eggs in the larvae of Drosophila species. One host larva always produces only one parasite, hence there must be some kind of mechanism which prevents super- parasitization or which eliminates supernumerary larvae within the host. BAKKER et al. (1967) found that Pseudeucoila can discriminate between non-parasitized and already parasitized larvae. However, this ability does not prevent egg-laying in already parasitized hosts when there are not sufficient non-parasitized hosts available. Hence, both super- parasitization and elimination occur. According to SALT (1961) there are four ways for elimination: 1) accidental injury, 2) selective starvation, 3) physiological suppression and 4) direct physical attack. Since in Pseudeucoila one host always produces one parasite, "accidental injury "cannot be the cause of the elimination. "Selective starvation" does not come into account either, as the elimination takes place when the host provides still plenty of food for more than one parasite larva. FISHER (1961a, b; 1963) analysed interspecific competition between Horogenes chrysostictos and

Journal

Netherlands Journal of Zoology (in 2003 continued as Animal Biology)Brill

Published: Jan 1, 1970

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