References

Crop-weed-insect interactions and the development of pest-stable cropping systems, in Pest Pathogens and Vegetation. The Role of Weeds and Wild Plants in the Ecology of Crop Pests and Diseases, Proc. Univ. of York and Br. Ecol. Soc. and Fed. Br. Plant Path., 1980, J. M. Thresh, Ed., Pitman, Boston, 459-466. Altieri, M. A., 1983. Vegetational designs for insect-habitat management, Environ. Manage., 7 3-7. Altieri, M. A. and Letourneau, D. K., 1982. Vegetation management and...

Biology And Ecology Of Soil Fauna

Soil mesofauna are often categorized by specific feeding behaviors, often depicted as microbial feeders. However, it should be emphasized that many organisms are at least capable of feeding at other trophic groups. As a result, omnivory in soil communities may be more prevalent than assumed previously (Walter et al., 1986 Walter, 1987 Walter et al., 1988 Walter and Ikonen, 1989 Mueller et al., 1990). Our discussion will focus specifically on nematodes, Collembola (springtails), and mites...

The Global Strategy

To assist countries to respond to these imperatives for upgrading the management of animal genetic resources, a framework for a global strategy has been supported and is known as the Strategy for the Management of Farm Animal Genetic Resources. The framework of the Strategy consists of four fundamental components. The Strategy is designed to be comprehensive to emphasize the balanced approach required to understand, utilize, and maintain AnGR better and more cost-effectively over time. The four...

Patterns Of Insect Biodiversity In Agroecosystems

Arthropod diversity has been correlated with aspects of plant diversity in agro-ecosystems. A greater variety of plants conforming to a particular crop pattern should lead to a greater variety of herbivorous insect species, and this in turn should determine a greater diversity of predators and parasites (Figure 5). A greater total biodiversity can then play a key role in optimizing agroecosystem processes and function (Altieri, 1984). Several hypotheses can be offered to support the idea that...

Protozoan Diversity In Agroecosystems

Studies on grasslands (McNaughton, 1977 Tilman, 1996) show that biodiversity stabilizes community and ecosystem processes, although individual species within the system may fluctuate considerably. Tilman (1996) found wide variations in the biomass of the 24 most abundant species of plants in an 11-year study. In a 6-month study of soil ciliates under a spruce stand, Lehle (1992) found that the proportions of the three dominant ciliate species fluctuated widely Cyclidium muscicola ranged from 8...

Research Agenda And Findings That Support The Model

Question 1 Can a Perennial Grain Yield As Well As an Annual Grain Work at the Land Institute to domesticate perennial grains began in 1978 with an inventory of nearly 300 herbaceous perennial species for their suitability to the environment of central Kansas and their promise as seed crops. A second inventory examined the agronomic potential in 4300 accessions of perennial grass species within the C3 genera Bromus, Festuca, Lolium, Agropyron, and Elymus (Leymus). From these inventories, a...

The Nature And Function Of Biodiversity In Agroecosystems

Biodiversity refers to all species of plants, animals, and microorganisms existing and interacting within an ecosystem. In agroecosystems, pollinators, natural enemies, earthworms, and soil microorganisms are all key biodiversity components that play important ecological roles, thus mediating such processes as genetic introgression, natural control, nutrient cycling, decomposition, etc. (Figure 2). The type and abundance of biodiversity in agriculture will differ across agroecosystems which...

Role Of Soil Protozoa

Microarthropods and larger fauna, especially earthworms, increase the rate and amount of mineralization by comminution of organic matter and by redistribution of hot spots of activity through movements. However, mineralization and return of nutrients to plants occur in the water films covering soil aggregates and filling their pores. Here, bacteria and fungi decompose organic matter and immobilize the extracted nutrients into their bodies, but grazing by the microfauna, protozoa, and nematodes...

Plant Biodiversity And Insect Stability In Agroecosystems

From the early 1970s on, the literature provides hundreds of examples of experiments documenting that diversification of cropping systems often leads to reduced herbivore populations (Andow, 1991 Altieri, 1994). Most experiments that have mixed other plant species with the primary host of a specialized herbivore show that, in comparison with diverse crop communities, simple crop communities have greater population densities of specialist herbivores (Root, 1973 Cromartie, 1981 Risch et al.,...

Ecosystem Processes

Micro- and mesofauna contribute directly to ecosystem processes such as decomposition and nutrient cycling in complex and interactive ways (Swift et al., 1979). Bacteria, actinomycetes, fungi, algae, and protozoa are primary decomposers of organic matter. These microorganisms are involved directly with production of humus, cycling of nutrients and energy, elemental fixation, metabolic activity in soil, and the production of complex chemical compounds that cause soil aggregation....

Augmentation Of Beneficials

Augmentation, broadly defined, covers all of the activities that improve the effectiveness of beneficials (DeBach, 1964), such as new species releases (inoculative or inundative), planned genetic change, landscape modification, and so on. The addition of a new species or strain of species into a new area increases species diversity, but it can also affect interspecific relationships and population genetic characteristics. Releases of Mass-Reared Natural Enemies There are two main types of...

Evolution Of The Global Strategy

The Food and Agricultural Organization (FAO) mandate, which is regularly reviewed by its 174 member governments, covers (1) collating, analyzing, and reporting information (2) providing technical assistance, with emphasis on the developing world and (3) providing a forum for intergovernmental discussion and policy development. The member governments have resolved that FAO should lead, coordinate, facilitate and report on the Strategy for the Management of Farm Animal Genetic Resources...

Linkages Between Agricultural And Urban Components Of The Landscape

Figure 3 The development of an agro-urban sustainable (P R 1) landscape. The town marketplace historically was closely linked to the agricultural landscape. Sustain-ability in the modern agro-urban landscape increasingly must be based on the management of suburban areas (ecotones) as natural linkages between urban and agricultural systems. Figure 3 The development of an agro-urban sustainable (P R 1) landscape. The town marketplace historically was closely linked to the agricultural landscape....

Introduction

Today, scientists worldwide are increasingly starting to recognize the role and significance of biodiversity in the functioning of agricultural systems (Swift et al., 1996). Research suggests that, whereas in natural ecosystems the internal regulation of function is substantially a product of plant biodiversity through flows of energy and nutrients and through biological synergisms, this form of control is progressively lost under agricultural intensification and simplification, so that...

Contents

Beneficial Insects and Their Value Biodiversity Crisis Biodiversity in Farmland Biodiversity Monitoring Key Beneficials in Agroecosystems Intraspecific Diversity of Beneficials Biodiversity of Beneficials in Insect Pest Control Systems Importation of Beneficials Natural Enemy Spectrum, Selection, and Adaptation Beneficial Introductions and Specificity Conservation of Beneficials Habitat Management, Crop Structure, and Diversity Food Sprays and Semiochemicals Modification of Chemical Pest...