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Over two consecutive years, arthropod communities in the tree canopy were sampled periodically by beating and suction techniques. Significantly higher numbers of beneficial arthropods were found in the RV and S treatments in comparison with bare soil. Spiders and parasitoid wasps were the two most common groups, representing, respectively, 70% and 19% of all catches in beating samples and 33% and 53% in suction samples. For the RV and S treatments, significant seasonal deviations from the bare soil treatment were observed using principal response curves. Similar seasonal patterns were observed over the two years. The RV and S treatments showed significant positive deviations from the BS treatment in late spring and summer, accounted for the higher numbers of parasitoid wasps, coccinelids and lacewings present. By contrast, the seasonal deviations observed for the spider community differed from those of the remaining arthropods. During late winter and early spring, the RV and S treatments presented a higher abundance of spiders in the tree canopy, in comparison with bare soil, whereas in the summer significantly more spiders were found in the bare soil treatment. Spider movements between tree canopy and ground vegetation layers may justify this result.<\/jats:p>","DOI":"10.1017\/s0007485309990526","type":"journal-article","created":{"date-parts":[[2010,1,27]],"date-time":"2010-01-27T04:24:04Z","timestamp":1264566244000},"page":"489-499","source":"Crossref","is-referenced-by-count":70,"title":["Effect of ground cover vegetation on the abundance and diversity of beneficial arthropods in citrus orchards"],"prefix":"10.1017","volume":"100","author":[{"given":"E.B.","family":"Silva","sequence":"first","affiliation":[]},{"given":"J.C.","family":"Franco","sequence":"additional","affiliation":[]},{"given":"T.","family":"Vasconcelos","sequence":"additional","affiliation":[]},{"given":"M.","family":"Branco","sequence":"additional","affiliation":[]}],"member":"56","published-online":{"date-parts":[[2010,1,27]]},"reference":[{"key":"S0007485309990526_ref054","doi-asserted-by":"crossref","first-page":"668","DOI":"10.21273\/HORTTECH.13.4.0668","article-title":"Managing orchard floor vegetation in flood-irrigated citrus groves","volume":"13","author":"Wright","year":"2003","journal-title":"HortTechnology"},{"key":"S0007485309990526_ref052","doi-asserted-by":"publisher","DOI":"10.1002\/ps.1572"},{"key":"S0007485309990526_ref050","first-page":"1","volume-title":"Proceedings of the NZ Plant Protection Conference 49","author":"Thomson","year":"1996"},{"key":"S0007485309990526_ref047","first-page":"33","volume-title":"Ecological Infrastructures and Biological Control: The Case of Citrus","author":"Sousa","year":"2006"},{"key":"S0007485309990526_ref045","doi-asserted-by":"publisher","DOI":"10.1603\/0046-225X-32.1.39"},{"key":"S0007485309990526_ref042","doi-asserted-by":"crossref","first-page":"21","DOI":"10.21273\/HORTSCI.32.1.21","article-title":"Winter cover crops for sustainable agricultural systems: Influence on soil properties, water quality, and crop yields","volume":"32","author":"Sainju","year":"1997","journal-title":"HortScience"},{"key":"S0007485309990526_ref040","doi-asserted-by":"publisher","DOI":"10.2307\/1942161"},{"key":"S0007485309990526_ref039","first-page":"311","volume-title":"Enhancing Biological Control: Habitat Management to Promote Natural Enemies of Agricultural Pests","author":"Roltsch","year":"1998"},{"key":"S0007485309990526_ref038","first-page":"197","article-title":"Use of \u2018Vortis\u2019 arthropod suction sampler for monitoring natural enemies in citrus orchards","volume":"26","author":"Rodrigues","year":"2003","journal-title":"IOBC wprs Bulletin"},{"key":"S0007485309990526_ref036","doi-asserted-by":"publisher","DOI":"10.1093\/ee\/26.5.1049"},{"key":"S0007485309990526_ref035","doi-asserted-by":"publisher","DOI":"10.1016\/S0167-8809(99)00021-3"},{"key":"S0007485309990526_ref032","first-page":"103","volume-title":"Revue of Coccinellidae from Portugal","author":"Raimundo","year":"1986"},{"key":"S0007485309990526_ref031","first-page":"255","volume-title":"Enhancing Biological Control: Habitat Management to Promote Natural Enemies of Agricultural Pests","author":"Olkowski","year":"1998"},{"key":"S0007485309990526_ref028","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-015-7358-0"},{"key":"S0007485309990526_ref027","doi-asserted-by":"publisher","DOI":"10.1111\/j.0013-8703.2004.00165.x"},{"key":"S0007485309990526_ref026","doi-asserted-by":"publisher","DOI":"10.1653\/0015-4040(2003)086[0080:LCCATI]2.0.CO;2"},{"key":"S0007485309990526_ref024","first-page":"110","volume-title":"Integrated Insect Pest Management for Citrus in Northern Mediterranean Countries","author":"Katsoyannos","year":"1996"},{"key":"S0007485309990526_ref022","first-page":"222","volume-title":"Generalized Estimating Equations","author":"Hardin","year":"2003"},{"key":"S0007485309990526_ref019","doi-asserted-by":"publisher","DOI":"10.1111\/j.1461-0248.2007.01037.x"},{"key":"S0007485309990526_ref018","first-page":"254","volume-title":"Citrus","author":"Davies","year":"1994"},{"key":"S0007485309990526_ref017","first-page":"25","volume-title":"Enhancing Biological Control: Habitat Management to Promote Natural Enemies of Agricultural Pests","author":"Corbett","year":"1998"},{"key":"S0007485309990526_ref016","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2311.1998.00108.x"},{"key":"S0007485309990526_ref014","doi-asserted-by":"publisher","DOI":"10.1016\/0167-8809(94)90121-X"},{"key":"S0007485309990526_ref009","doi-asserted-by":"publisher","DOI":"10.1111\/j.1752-4598.2008.00028.x"},{"key":"S0007485309990526_ref007","unstructured":"Ben-Dov Y. , Miller D.R. & Gibson G.A.P. 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