Abundance and prey spectrum of web spiders in rice agroecosystems of Pangasugan, Leyte, Philippines

Maria Juliet  C. Ceniza,; Sarwshri  Gangurde,; Konrad  Martin,

Abundance and prey spectrum of web spiders in rice agroecosystems of Pangasugan, Leyte, Philippines

Sarwshri Gangurde | Konrad Martin | Maria Juliet C. Ceniza

Abstract:

The cultivation of tropical Asian rice, which may have originated 9,000 years ago, created an agricultural ecosystem of unrivalled ecological complexity. A complex arthropod communitiy is inhabiting in the rice ecosystem, including pest and beneficial species. Concerning beneficials, the spiders are among the very commonly encountered species. A study was conducted in the irrigated tropical rice fields of Leyte, Philippines on the abundance and their potential for natural biological control. The objective of this study was to record, identify and count individuals of selected web building spider species and evaluate the prey spectrum at different stages of rice growth. It was observed that abundance of spiders in the rice ecosystems occurred only starting at the tillering stage when the preferred host plant stage for the prey species was reached. The most dominant species of spiders encountered were Tetragnatha species. However, in the latest stage of rice development, Argiope species were the most dominant spiders. Prey species included mainly the pest species of the rice plants, such as the hoppers, rice bugs and other smaller insects and in addition the other predatory species such as the coccinellid beetles, dragonflies and parasitic hymenopterans were also observed. The web building spiders showed more activity in the late afternoon than in early morning.

References:

BALDISSERA R., G. GANADE and S.B. FONTOURA. 2004. Web spider community response along an edge between pasture and Araucaria forest. Biological Conservation 118 (3): 403-409.
BRUCE M.J., A.M. HEILING and M.E. HERBERSTEIN. 2004. Web decorations and foraging success in ‘Araneus’ eburnus (Araneae: Araneidae). Annales Zoologici Fennici 41 (4): 563-575.
CODDINGTON J. A. and H. W. LEVI. 1991. Systematics and evolution of spiders (Araneae). Annual Review of Ecology and Systematics 22: 565-592.
DIDONET J., A. P. DIDONET, E. L. ERASMO and G.R. SANTOS. 2001. Incidence and population dynamics of pests and their natural enemies in upland rice in Gurupi, Tocantins. - Bioscience Journal. 17(1): 67-76.
MAYASHITA T., M. TAKADA and A. SHIMAZAKE. 2003. Experimental evidence that aboveground predators are sustained by underground detritivores. Oikos 103 (1):31-36.
NAKATA K. and A. USHIMARU. 2004. Difference in web construction behavior at newly occupied web sites between two Cyclosa species. Ethology 110 (5): 397-411.
SHEPARD B.M., A.T. BARRION and J.A. LITSINGER. 1987a. Helpful insects, Spiders and Pathogens. - International Rice Research Institute (IRRI), Los Banos. pp 1-45.
VREDEN G. and A. L. AHMADZABIDI. 1986. Pests of rice and their natural enemies in Peninsular Malaysia. Pudoc Publishers. pp 15-19.
YOU M.S. 1997. The species richness and diversity of the arthropod communities in rice fields. Entomologia- Sinica. 4(3): 238-248.