No correlation between the diversity and productivity of assemblages: evidence from the phytophage and predator assemblages in various cotton agroecosystemsReportar como inadecuado




No correlation between the diversity and productivity of assemblages: evidence from the phytophage and predator assemblages in various cotton agroecosystems - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Science China Life Sciences

, Volume 57, Issue 9, pp 936–943

First Online: 16 August 2014Received: 06 March 2014Accepted: 16 June 2014DOI: 10.1007-s11427-014-4733-z

Cite this article as: Gao, F., Men, X. & Ge, F. Sci. China Life Sci. 2014 57: 936. doi:10.1007-s11427-014-4733-z

Abstract

Biodiversity research has shown that primary productivity increases with plant species number, especially in many experimental grassland systems. Here, we assessed the correlation between productivity and diversity of phytophages and natural enemy assemblages associated with planting date and intercropping in four cotton agroecosystems. Twenty-one pairs of data were used to determine Pearson correlations between species richness, total number of individuals, diversity indices and productivity for each assemblage every five days from 5 June to 15 September 2012. At the same trophic level, the productivity exhibited a significant positive correlation with species richness of the phytophage or predator assemblage. A significant correlation was found between productivity and total number of individuals in most cotton fields. However, no significant correlations were observed between productivity and diversity indices including indices of energy flow diversity and numerical diversity in most cotton fields for either the phytophage or the predator assemblages. Species richness of phytophage assemblage and total individual numbers were significantly correlated with primary productivity. Also, species richness of natural enemy assemblage and total number of individuals correlated with phytophage assemblage productivity. A negative but not significant correlation occurred between the indices of numerical diversity and energy flow diversity and lower trophic-level productivity in the cotton-phytophage and phytophage-predator assemblages for most intercropped cotton agroecosystems. Our results clearly showed that there were no correlations between diversity indices and productivity within the same or lower trophic levels within the phytophage and predator assemblages in cotton agroecosystems, and inter-cropped cotton fields had a stronger ability to support the natural enemy assemblage and potentially to reduce phytophages.

Keywordscorrelation productivity diversity cotton agroecosystem insect assemblage This article is published with open access at link.springer.com life.scichina.com

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Autor: Feng Gao - XingYuan Men - Feng Ge

Fuente: https://link.springer.com/







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