Predator–prey ratios on cocoa along a land-use gradient in Indonesia

By Alexandra-Maria Klein, I. Steffan‐Dewenter, T. Tscharntke. Biodiversity and Conservation, 2002

125 citations recorded by the source corpus.

Tropical landscapes are dominated by agroecosystems, but the potential value of agroecosystems for the survival of species is often overlooked. In agroecosystems, species conservation is especially important when functional groups such as predators are affected. In Central Sulawesi, we sampled arthropods on cocoa in a gradient of land-use intensity from extensively used forest gardens to intensively used agroforestry systems. The abundance and diversity of all arthropods did not correlate with land-use intensity, so human impact was not followed by high species losses. However, the number of species and abundance of the phytophagous arthropods increased and that of the entomophagous arthropods decreased with land-use intensity. The reduced predator–prey ratio in intensified systems can be related to their reduced species richness of shade trees and the changed microclimate (increased temperature, decreased humidity and canopy cover). In conclusion, transformation of traditional into intensified agroforestry systems had a great impact on arthropod community structure on cocoa. Since predator–prey ratios decreased with increasing land-use intensity, local farmers should have least pest problems in the traditionally diversified agroforestry systems.

Subfields: Horticulture, Insect Science, Plant Science

View Paper: https://www.semanticscholar.org/paper/8db0c2b2cd42dac3a4940bb4437a1fc637862321

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Citations in the corpus

Tree species richness and density affect parasitoid diversity in cacao agroforestry (2004, background): “Klein et al. (2002), studying a cacao agroforestry system, showed that the abundance and species richness of entomophagous insects diminished with land-use intensity: an effect which the authors ascribed to reduced species richness of shade trees as well as increased temperature, decreased canopy…”
Effects of Land‐Use Intensity in Tropical Agroforestry Systems on Coffee Flower‐Visiting and Trap‐Nesting Bees and Wasps (2002, background): “In a parallel study with phytophagous and entomophagous insects on cocoa, predator-prey ratios showed the expected decrease with land-use intensity (Klein et al. 2002).”
Conservation biological control and enemy diversity on a landscape scale (2007, background): “, 2005), predator/prey ratios (Klein et al., 2002) and predation risk for crop pests (Thies and Tscharntke, 1999).”
The effect of land use systems on tree diversity: farmer preference and species composition of cocoa-based agroecosystems in Ghana (2011, background): “Even though agro-ecosystems dominate tropical landscapes, their potential value for conserving biodiversity has been largely ignored ( Klein et al. 2002 ).”
Pollination of Coffea canephora in relation to local and regional agroforestry management (2003, background): “Bee community structure changes with light intensity and temperature (Klein et al. 2002a), but shade effects on flower-visiting bee communities on coffee and the resulting fruit set are poorly studied.”
Forest use and vertical stratification in fruit-feeding butterflies of Sulawesi, Indonesia: impacts for conservation (2005, background): “Recent studies in the Lore Lindu National Park show that young secondary forests and agroforestry systems still support a relatively high species richness (see also Schulze et al. (2004a) for butterflies; Klein et al. 2002a,b for bees and wasps).”
Sustainable pest regulation in agricultural landscapes: a review on landscape composition, biodiversity and natural pest control (2006, background): “This is also true for many insect species and, in particular, natural enemies of insect herbivores (Duelli et al. 1999; Klein et al. 2002; Duelli & Obrist 2003; Kruess 2003; Schmidt & Tscharntke 2005b).”
Biodiversity in tropical agroforests and the ecological role of ants and ant diversity in predatory function (2006, background): “Coffee intensification results in the loss of arthropod biodiversity ( Perfecto et al. , 1996, 1997; Moguel & Toledo, 1999; Klein et al. , 2002a; Perfecto et al. , 2003 ) and affects biological control agents, including ants ( Ibarra-Núñez et al. , 1995; Lachaud & García Ballinas, 1999 ).”