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Citrus-orchard ground harbours a diverse, well-established and abundant ground-dwelling spider fauna

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URI
http://hdl.handle.net/20.500.11939/5677
DOI
10.5424/sjar/20110902-400-10
Derechos de acceso
openAccess
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Author
Monzó, César; Molla, O.; Vanaclocha, Pilar; Monton, H.; Melic, A.; Castanera, P.; Urbaneja, Alberto
Date
2011
Cita bibliográfica
Monzo, C., Molla, O., Vanaclocha, P., Monton, H., Melic, A., Castanera, P., Urbaneja, A. (2011). Citrus-orchard ground harbours a diverse, well-established and abundant ground-dwelling spider fauna. Spanish Journal of Agricultural Research, 9(2), 606-616.
Abstract
Ground-dwelling spider assemblages comprise one of the most representative predatory groups to be found in many crops. There is some evidence of the role that ground-dwelling spiders play in controlling certain citrus pests; however, there are almost no studies about the abundance and composition of this predatory group in citrus orchards. A three-year survey conducted using pitfall traps in three citrus orchards in Eastern Spain yielded more than five-thousand ground-dwelling spiders belonging to more than 50 species and 20 families. Wandering families such as Lycosidae, Gnaphosidae and Zodariidae were the most numerous in terms of captures. The generalist predator Pardosa cribata Simon (Araneae: Lycosidae) was the most common species, representing a quarter of all captures, followed by Zodarion cesari Pekar. (Araneae: Zodariidae) and Trachyzelotes fuscipes (Koch) (Araneae: Gnaphosidae). Spiders were active throughout the year with a peak population in summer. The species abundance data for the three spider assemblages sampled fitted a log normal statistical model which is consistent with a well-established community. The presence of a cover crop provided higher abundance of alternative prey and consequently higher abundance and diversity of ground-dwelling spiders. This work demonstrates that the citrus-orchard ground harbours a diverse and abundant ground-dwelling spider fauna, which is also active throughout the year. A challenge for future studies will be to establish conservation management strategies for these predators, that will improve biological control of those citrus pests that inhabit or spend part of their life cycle on the orchard floor.
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