Top-down control of herbivores varies with ecosystem types

Zhang, Yangjian
Adams, Jonathan
Journal of Ecology
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1.?Björkman et al. comment on Adams and Zhang’s finding of more leaf herbivory with increasing latitude, pointing out that top-down control by predators on insect herbivores might cause less herbivory in warmer regions. 2.?Stronger top-down control with more plant diversity has been found mostly in systems that are less diverse overall, such as agricultural fields and grassland. Studies have also concentrated on small spatial scales. Whether top-down control is relatively more important at large spatial scales in the most highly diverse tropical or warm temperate forests is still in doubt. 3.?Synthesis. The importance of top-down predator control of herbivores may vary with the system studied. Future work to understand the controls of herbivores needs to precisely monitor and compare the dynamics of individual herbivore species and their predators at a large spatial scale.
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Journal of Ecology
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Grassland Society of Southern Africa

The Grassland Society of Southern Africa (GSSA) is involved and concerned with the science and practice of range and pasture management. This broad field involves primarily the use and conservation of natural resources. It encompasses applied fields such as livestock production, wildlife management, nature conservation, water catchment management and range and mine-dump rehabilitation. The disciplines include, amongst others, ecology, botany zoology, range and pasture science, animal science, soil science and genetics. This collection includes journal articles from the African Journal of Range and Forage Science as well as related articles and reports from throughout the Southern African region.