ABSORPTION AND CANNIBALISM - DO PHYTOSEIIDS CONSERVE EGG RESOURCES WHEN PREY DENSITIES DECLINE RAPIDLY

被引：14

作者：

CROFT, BA ^{[1
]}

KIM, SS ^{[1
]}

KIM, DI ^{[1
]}

机构：

[1] OREGON STATE UNIV,DEPT ENTOMOL,CORVALLIS,OR 97331

来源：

EXPERIMENTAL & APPLIED ACAROLOGY | 1995年 / 19卷 / 06期

关键词：

METASEIULUS OCCIDENTALIS; NEOSEIULUS FALLACIS; TYPHLODROMUS PYRI; AMBLYSEIUS ANDERSONI; TERTANYCHUS URTICAE;

D O I：

10.1007/BF00052392

中图分类号：

Q96 [昆虫学];

学科分类号：

摘要：

The number of eggs oviposited or left in the opisthosomas of dead mites (total eggs) was assessed for Metaseiulus occidentalis (Nesbitt), Neoseiulus fallacis (Carman), Typhlodromus pyri Scheuten or Amblyseius andersoni Chant when each was caged with either (1) no Tetranychus urticae Koch, (2) only odours of T. urticae, (3) ten eggs of M. occidentalis or (4) ten nymphs of M. occidentalis (T. pyri for M. occidentalis). The total eggs for the no prey versus odour tests did not differ within species; the levels were the greatest for N. fallacis > T. pyri > A. andersoni > M. occidentalis. Among treatments, egg means did not differ for M. occidentalis but they did for N. fallacis and T. pyri and similar trends were seen for A. andersoni. Egg means were usually less for mites held with ten predator nymphs than mites held with ten predator eggs or with no prey. Were adult females with nymphs absorbing rather than ovipositing their eggs or dying with them in their opisthosomas? Activity levels (walking) for adult females were no more for mites held with nymphs versus no food. The data indicated that interference by nymphs was not increasing the energy use of females and thus reducing egg levels. However, tests with ten nymphs, one egg and no adult female had egg losses from nymphal predation that could account for fewer eggs in cage tests. Overall, no evidence for absorption was found. If it occurs, it must be among younger eggs or mites exposed to less rapid prey losses than were the mites tested here; in addition, other stimuli may cause absorption. The total eggs in sticky-tape tests were greatest for N. fallacis > M. occidentalis > T. pyri > A. andersoni. Cage versus stick-tape data differed most for M. occidentalis because of cannibalism. All four mites cannibalized eggs but M. occidentalis did most rapidly and extensively. When starved, it laid all of its eggs before the other three species did. Such behaviours may enhance survival of M. occidentalis when prey become scarce.

引用

页码：347 / 356

页数：10

共 12 条

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