Agricultural intensification erodes taxonomic and functional diversity in Mediterranean olive groves by filtering out rare speciesRubén Tarifa, Carlos Martínez-Núñez, Francisco Valera, Juan P. González-Varo, Teresa Salido & Pedro J. Rey
1. Agri-Environmental Schemes (AES) have been proposed to mitigate the impact of agriculture on both taxonomic and functional biodiversity. However, a better knowledge of the mechanisms involved in the loss of agrobiodiversity is needed to implement efficient AES. An unbalanced effort on research towards arable lands compared to permanent crops, and on fauna relative to plants, is patent, which limits the generalization of AES effectiveness. 2. We evaluated the effects of agricultural management and landscape...
Hybrid networks reveal contrasting effects of agricultural intensification on antagonistic and mutualistic motifsCarlos Martínez Núñez & Pedro Rey
1. Anthropogenic-driven perturbations such as agricultural intensification can affect simultaneously and distinctly several species groups and ecosystem functions. Unveiling these concurrent effects on interdependent species groups connected by different types of ecological interactions is a key challenge for ecologists. To this endeavor, hybrid ecological networks arise as a promising tool. 2. In this study, we used bee trap nests to sample hybrid networks that combined mutualistic and antagonistic interactions to explore agricultural intensification effects on...
Partitioning beta diversity to untangle mechanisms underlying the assembly of bird communities in Mediterranean olive grovesVicente García-Navas, Carlos Martínez-Núñez, Rubén Tarifa, Antonio J. Manzaneda, Francisco Valera, Teresa Salido, Francisco M. Camacho & Pedro J. Rey
Aim: We investigated taxonomic and functional beta diversity of bird communities inhabiting Mediterranean olive groves subject to either intensive or extensive management of the ground cover and located in landscapes with different degrees of complexity. Location: Andalusia, southern Spain. Methods: We partitioned taxonomic and functional beta diversity into its two additive components, turnover and nestedness. We also explored the contributions of single sites to overall beta diversity (LCBD) and separated the effects of species replacement...
Variability In The Accuracy Of Self-Assessments Among Low, Moderate, And High Performing Students in University EducationSamuel Parra León, Antonio Pantoja Vallejo & James Byron Nelson
The present work empirically examines the validity of Student Self-Assessment (SSA) as an educational assessment in higher education. We briefly review the principle methodological factors that could affect SSA validity, as well as the main findings identified in the literature. One empirical study is presented that compares student-self evaluations on a test with the evaluation made by the course instructor while controlling for students' experience with SSA, criteria, rubric, and scales used by the student...
Persistence of seed dispersal in agroecosystems: effects of landscape modification and intensive soil management practices in avian frugivores, frugivory and seed deposition in olive croplandsPedro J. Rey, Francisco M. Camacho, Rubén Tarifa, Carlos Martínez-Núñez, Teresa Salido, Antonio J. Pérez & Daniel García
Farming impacts on animal-mediated seed dispersal through mechanisms operating at least at two spatial scales: first, at the landscape scale, through habitat loss and land conversion to agriculture/livestock grazing, and second, by local intensification (farm scale) of the agricultural practices. Nonetheless, these two scales of farming impact on the seed dispersal function have been rarely integrated. In particular, studies evaluating the effect of agriculture in the seed dispersal function of frugivorous birds in Mediterranean ecosystems...
Legacy effects of seed dispersal mechanisms shape the spatial interaction network of plant species in Mediterranean forestsAntonio Perea, Thorsten Wiegand, José Garrido, Pedro Rey & Julio M. Alcantara
1. Seed dispersal by frugivores plays a key role in structuring and maintaining tree diversity in forests. However, little is known about how the spatial legacy of seed dispersal and early recruitment shapes spatial patterns and the spatial interaction network of plant species in mature forest communities. 2. We analysed two fully mapped mixed Pine-Oak forest communities using spatial point pattern analysis to determine (i) the detailed structure of the intraspecific spatial patterns of saplings...
Fruit abundance and trait matching determine diet type and body condition across frugivorous bird populationsJuan P. González-Varo, Alejandro Onrubia, Néstor Pérez-Méndez, Rubén Tarifa & Juan C. Illera
Research on seed-dispersal mutualisms has been highly unbalanced towards the plants, largely overlooking the fitness effects of fruit resources on frugivorous animals. Moreover, despite morphological mismatches like gape limitation may reduce the abundance of fruits that are actually accessible to a frugivore species, there is very little evidence on the trait-matching implications from a frugivore’s perspective. Here, we refine recent resource-provisioning models to comprehensively test the joint effects of fruit abundance and trait matching on...
University of Jaén8
University of Cádiz3
University of Oviedo2
Estacion Experimental de Zonas Aridas2
Helmholtz Centre for Environmental Research1
University of the Basque Country1
Estación Biológica de Doñana1
Estación Experimental del Zaidín1
Institute for Research and Technology in Food and Agriculture1