Person:
Rescia Perazzo, Alejandro Javier

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First Name
Alejandro Javier
Last Name
Rescia Perazzo
URI
https://hdl.handle.net/20.500.14352/74421
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Biológicas
Department
Biodiversidad, Ecología y Evolución
Area
Ecología
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2017 - 201912020 - 20221
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    Relationship between landscape structure and abundance of airborne beneficial arthropods in an olive agro-ecosystem
    (Iobc Wprs Bulletin, 2017) Pascual, Susana; Rescia Perazzo, Alejandro Javier; Sánchez Ramos, Ismael; González Núñez, Manuel; Ortega Quero, Marta
    Some of the groups of beneficial arthropods present in the olive grove canopy are hoverflies, hymenopteran parasitoids and bees. In this research we test the hypothesis that the abundance of these groups in olive groves increases with increasing landscape complexity. In spring 2015 and 2016 we determined the abundance of the beneficial insect groups in 15 olive groves by identification of insects captured on 4 yellow sticky traps in each olive grove. Indices of landscape structure were calculated in circular areas with radii ranging from 250 to 1500 m around the 15 olive groves selected. Preliminary results indicate that in both sampling dates, the abundance of hoverflies was negatively correlated with the patch size of the olive grove, but positively correlated with the total area of scrublands and oak forests and with the diversity index of land uses. The abundance of hymenopteran parasitoids and bees was also positively correlated with the total area of scrublands with oak, in both years, but negatively correlated with the patch size of olive groves in the case of bees. Not all these relationships were significant at all radii and years analysed. These results indicate that intermingling of spontaneous vegetation with olive groves favours the presence of beneficial arthropods.
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    Effects of landscape structure on abundance and family richness of hymenopteran parasitoids in the olive agroecosystem
    (Agriculture, Ecosystems and Environment, 2022) Pascual, Susana; Rescia Perazzo, Alejandro Javier; Ayca Ondul, Busra; Paul, Cesar; Ortega Quero, Marta
    Farming systems maintain ecosystem services related to arthropod biodiversity, which need to be understood for its effective conservation. Some of these arthropods may also be enemies of crop pests. It has been shown that farming systems surrounded by other types of natural or semi-natural land covers/uses are less affected by pests. The abundance and richness of hymenopteran parasitoid (HP) families in olive groves were analysed along a gradient of complexity of the landscape surrounding these agroecosystems. The working hypothesis was that landscape structure is related to the abundance and richness of HP families. Through principal component analysis of samples analysed in 15 olive groves during the springs and autumns of 2015 and 2016, we found that a higher richness of HP families is associated to simple landscapes with olive grove predominance and a lower richness in landscapes with higher diversity of land uses. The most abundant families in olive-dominated landscapes were Pteromalidae, Encyrtidae and Eulophidae, and the least abundant were Elasmidae, Eupelmidae, Chrysididae, Platygastridae and Eurytomidae. In the most diverse olive grove landscapes only three families appeared: Mymaridae, the most abundant, and Diapriidae and Signiphoridae with lower abundance. Scelionidae was the most abundant family in all olive landscapes, both simple and complex. The greater richness and abundance of HP in olive-dominated landscapes does not guarantee biological control, but it does provide conservation of arthropod biodiversity as a cross-cutting ecosystem service.