GENERALIST PREDATORS DISRUPT BIOLOGICAL CONTROL BY A SPECIALIST PARASITOID

Two broad classes of arthropod natural enemies attack insect herbivores: specialists and generalists. The tight dynamical linkage of specialist natural enemies and their prey may make the specialists able to respond numerically to, and perhaps suppress, herbivore outbreaks. Because generalist predators may attack not only herbivores, but also the herbivores' specialist natural enemies, generalist predators may disrupt control of herbivore populations rather than contribute to it. We examined interactions between pea aphids (Acyrthosiphon pisum), a specialist parasitoid wasp (Aphidius ervi) that attacks the aphids, and a common generalist predator, carabid beetles (primarily Pterostichus melanarius). In two field experiments in alfalfa, we manipulated carabid densities to measure their direct (through predation) and indirect (through intraguild predation on A. ervi) impact on aphid population dynamics. The first experiment was initiated when plants were short (following cutting), and carabid predation of a...

[1]  A. Ives,et al.  BIOLOGICAL CONTROL IN DISTURBED AGRICULTURAL SYSTEMS AND THE RAPID RECOVERY OF PARASITOID POPULATIONS , 2001 .

[2]  W. E. Snyder,et al.  CONTRASTING TROPHIC CASCADES GENERATED BY A COMMUNITY OF GENERALIST PREDATORS , 2001 .

[3]  Vincent A. A. Jansen,et al.  PERIODIC MORTALITY EVENTS IN PREDATOR–PREY SYSTEMS , 2000 .

[4]  A. Ives,et al.  Variability and Parasitoid Foraging Efficiency: A Case Study of Pea Aphids and Aphidius ervi , 1999, The American Naturalist.

[5]  Taylor,et al.  Dynamical role of predators in population cycles of a forest insect: An experimental test , 1999, Science.

[6]  W. E. Snyder,et al.  Predator Interference and the Establishment of Generalist Predator Populations for Biocontrol , 1999 .

[7]  J. Holland,et al.  Sampling epigeal arthropods: an evaluation of fenced pitfall traps using mark‐release‐recapture and comparisons to unfenced pitfall traps in arable crops , 1999 .

[8]  R. Denno,et al.  POSITIVE PREDATOR–PREDATOR INTERACTIONS: ENHANCED PREDATION RATES AND SYNERGISTIC SUPPRESSION OF APHID POPULATIONS , 1998 .

[9]  A Sih,et al.  Emergent impacts of multiple predators on prey. , 1998, Trends in ecology & evolution.

[10]  R. Denno,et al.  Interspecific variation in the escape responses of aphids: effect on risk of predation from foliar-foraging and ground-foraging predators , 1998, Oecologia.

[11]  E. Lucas,et al.  Intraguild predation among aphid predators : Characterization and influence of extraguild prey density , 1998 .

[12]  R. Denno,et al.  The escape response of pea aphids to foliar‐foraging predators: factors affecting dropping behaviour , 1998 .

[13]  J. Niemelä,et al.  Establishment and interactions of carabid populations: an experiment with native and introduced species , 1997 .

[14]  B. Menge,et al.  Dection of Direct Versus Indirect Effects: Were Experiments Long Enough? , 1997, The American Naturalist.

[15]  C. Langdon,et al.  Effects of cultivation techniques and methods of straw disposal on predation by Pterostichus melanarius (Coleoptera : Carabidae) upon slugs (Gastropoda : Pulmonata) in an arable field , 1996 .

[16]  E. Evans,et al.  Indirect Interactions in Biological Control of Insects: Pests and Natural Enemies in Alfalfa , 1996 .

[17]  G. Polis,et al.  Food Web Complexity and Community Dynamics , 1996, The American Naturalist.

[18]  G. C. Chang.  Comparison of Single Versus Multiple Species of Generalist Predators for Biological Control , 1996 .

[19]  Jay A. Rosenheim,et al.  Intraguild predation among biological-control agents: theory and evidence , 1995 .

[20]  Peter A. Abrams,et al.  The Fallacies of "Ratio‐Dependent" Predation , 1994 .

[21]  J. Wootton.  Putting the Pieces Together: Testing the Independence of Interactions among Organisms , 1994 .

[22]  L. Vet,et al.  Usurpation of host behaviour by a parasitic wasp , 1994, Animal Behaviour.

[23]  William W. Murdoch,et al.  POPULATION REGULATION IN THEORY AND PRACTICE , 1994 .

[24]  L. Osborne,et al.  Interactions of the Whitefly Predator Delphastus pusillus (Coleoptera: Coccinellidae) with Parasitized Sweetpotato Whitefly (Homoptera: Aleyrodidae) , 1994 .

[25]  B. Ekbom.  Arthropod predators of the pea aphid, Acyrthosiphon pisum Harr. (Hom., Aphididae) in peas (Pisum sativum L.), clover (Trifolium pratense L.) and alfalfa (Medicago sativa L.) , 1994 .

[26]  R. Arditi,et al.  Empirical Evidence of the Role of Heterogeneity in Ratio‐Dependent Consumption , 1993 .

[27]  Alan A. Berryman,et al.  The Orgins and Evolution of Predator‐Prey Theory , 1992 .

[28]  W. Völkl.  Aphids or their parasitoids : who actually benefits from ant-attendance? , 1992 .

[29]  Donald R. Strong,et al.  ARE TROPHIC CASCADES ALL WET? DIFFERENTIATION AND DONOR-CONTROL IN SPECIOSE ECOSYSTEMS' , 1992 .

[30]  P. Kindlmann,et al.  Possible consequences of a specific interaction between predators and parasites of aphids , 1992 .

[31]  R D Holt,et al.  Intraguild predation: The dynamics of complex trophic interactions. , 1992, Trends in ecology & evolution.

[32]  J. McNeil,et al.  Host behaviour modification by the endoparasitoid Aphidius nigripes: a strategy to reduce hyperparasitism , 1992 .

[33]  G. Polis,et al.  Complex Trophic Interactions in Deserts: An Empirical Critique of Food-Web Theory , 1991, The American Naturalist.

[34]  S. Riechert,et al.  Prey Control by an Assemblage of Generalist Predators: Spiders in Garden Test Systems , 1990 .

[35]  J. B. Lee,et al.  Carabid populations in field beans and their effect on the population dynamics of Sitona lineatus (L.) , 1990 .

[36]  B. Roitberg,et al.  Adaptive suicide in pea aphids: Decisions are cost sensitive , 1990, Animal Behaviour.

[37]  J. Soroka,et al.  SEASONAL OCCURRENCE OF THE PEA APHID, ACYRTHOSIPHON PISUM (HARRIS) (HOMOPTERA: APHIDIDAE), ON CULTIVARS OF FIELD PEAS IN MANITOBA AND ITS EFFECTS ON PEA GROWTH AND YIELD , 1990, The Canadian Entomologist.

[38]  J. Helenius.  Effect of epigeal predators on infestation by the aphid Rhopalosiphum padi and on grain yield of oats in monocrops and mixed intercrops , 1990 .

[39]  J. McNeil,et al.  Seasonal Microhabitat Selection by an Endoparasitoid Through Adaptive Modification of Host Behavior , 1989, Science.

[40]  K. Hopper,et al.  Chrysoperla carnea predation on Heliothis virescens larvae parasitized by Microplitis croceipes , 1988 .

[41]  J. Roland.  Decline in Winter Moth Populations in North America: Direct Versus Indirect Effect of Introduced Parasites , 1988 .

[42]  M. Smith,et al.  Predatory behavior of two species of ground beetles (Coleoptera: Carabidae) towards juvenile salamanders (Plethodon vehiculum) , 1988 .

[43]  Rhondda Jones.  Ants, parasitoids, and the cabbage butterfly Pieris rapae , 1987 .

[44]  B. Roitberg,et al.  Adaptive suicidal behaviour in pea aphids , 1987, Nature.

[45]  B. Pass,et al.  Foraging Behavior and Feeding Preference of Ground Beetles (Coleoptera: Carabidae) in Kentucky Alfalfa , 1986 .

[46]  Michael P. Hassell,et al.  GENERALIST AND SPECIALIST NATURAL ENEMIES IN INSECT PREDATOR-PREY INTERACTIONS , 1986 .

[47]  Michael L. Dungan.  Three-Way Interactions: Barnacles, Limpets, and Algae in a Sonoran Desert Rocky Intertidal Zone , 1986, The American Naturalist.

[48]  R. Lamb,et al.  Spray Timing and Economic Threshold for the Pea Aphid, Acyrthosiphon pisum (Homoptera: Aphididae), on Field Peas in Manitoba , 1985 .

[49]  Peter Chesson,et al.  Biological Control in Theory and Practice , 1985, The American Naturalist.

[50]  J. Onsager,et al.  Parasitism and Survival among Rangeland Grasshoppers in Response to Suppression of Robber Fly (Diptera: Asilidae) Predators , 1985 .

[51]  D. Hogg,et al.  Demographic Statistics for the Pea Aphid (Homoptera: Aphididae) in Wisconsin and a Comparison with Other Populations , 1984 .

[52]  M. Gilpin,et al.  Perturbation Experiments in Community Ecology: Theory and Practice , 1984 .

[53]  M. Kaldy,et al.  EFFECT OF THE PEA APHID, ACYRTHOSIPHON PISUM (HEMIPTERA (HOMOPTERA): APHIDIDAE), ON YIELD AND QUALITY OF FORAGE ALFALFA , 1982, The Canadian Entomologist.

[54]  D. Barber,et al.  LABORATORY STUDIES OF THE FOOD PREFERENCES OF SOME ORCHARD CARABIDS (COLEOPTERA: CARABIDAE) , 1982, The Canadian Entomologist.

[55]  J. Onsager,et al.  Influence of Predators on the Efficiency of the Blaesoxipha spp. Parasites of the Migratory Grasshopper , 1982 .

[56]  M. Hassell.  FORAGING STRATEGIES, POPULATION MODELS AND BIOLOGICAL CONTROL: A CASE STUDY , 1980 .

[57]  C. Edwards,et al.  Studies on Polyphagous Predators of Cereal Aphids , 1979 .

[58]  D. Rosen,et al.  Biological control by natural enemies , 1974 .

[59]  R. T. Arbogast,et al.  Interactions among Plodia interpunctella, Bracon hebetor, and Xylocoris flavipes , 1974 .

[60]  T. Harvey,et al.  Pea Aphid-Resistant Alfalfa Selected in the Field , 1972 .

[61]  W. Tostowaryk.  Relationship between Parasitism and Predation of Diprionid Sawflies , 1971 .

[62]  P. Kareiva,et al.  Theoretical Approaches to Biological Control: The case for indigenous generalists in biological control , 1999 .

[63]  J. Rosenheim.  Higher-order predators and the regulation of insect herbivore populations. , 1998, Annual review of entomology.

[64]  B. Ekbom,et al.  An Evaluation of the Parasitoid, Aphidius colemani Viereck (Hymenoptera: Braconidae) and the Predator Aphidoletes aphidimyza Rondani (Diptera: Cecidomyiidae) for Biological Control of Aphis gossypii Glover (Homoptera: Aphididae) on Cucumber , 1997 .

[65]  H. Godfray,et al.  Apparent Competition between Two Aphid Species , 1997 .

[66]  G. Lövei,et al.  Ecology and behavior of ground beetles (Coleoptera: Carabidae). , 1996, Annual review of entomology.

[67]  J. Roland,et al.  Biological Control of the Winter Moth , 1995 .

[68]  G. Polis,et al.  THE ECOLOGY AND EVOLUTION OF INTRAGUILD PREDATION: Potential Competitors That Eat Each Other , 1989 .

[69]  Mark A. McPeek,et al.  Predation, Competition, and Prey Communities: A Review of Field Experiments , 1985 .

[70]  R. L. Blackman,et al.  Aphids on the World's Crops: An Identification and Information Guide , 1984 .

[71]  S. Riechert,et al.  Spiders as Biological Control Agents , 1984 .

[72]  Professor Dr. Hans-Ulrich Thiele.  Carabid Beetles in Their Environments , 1977, Zoophysiology and Ecology.