| Data: |
2015 |
| Descripció: |
54 p. |
| Resum: |
Although trophic structure and feeding preferences of soil macroinvertebrates can change among habitats, the extent to which food web structure varies within ecosystems is unknown. In this work we aimed to assess changes in food web structure in an agroecosystem using an experiment setting in which plant and macroinvertebrate community composition and stable isotopes (δ13C and δ15N) of soil, plants and macroinvertebrates were analyzed at increasing distances from trees within a citrus grove and in an adjacent abandoned field. Within the citrus grove the macroinvertebrate community near the trunk differed from that located further away because of a higher number of detritivores. Generally, δ13C and δ15N values of soil, plants and macroinvertebrates decreased at increasing distances from trees. After correcting isotope values of macroinvertebrates by their isotopic baselines, macroinvertebrates from the abandoned field presented lower δ15N values than those of the citrus grove (i. e. they fed on lower trophic positions), and within the citrus grove macroinvertebrates near the trunk presented lower δ13C than those of the treatments further away (i. e. they relied more in plant-based resources). Decreasing organic matter and water availability at increasing distances from trees is the most parsimonious explanation of the observed isotopic gradient, and may in turn drive changes in food web structure (composition and trophic positions of species) in the studied area, both within the citrus grove and between the citrus grove and the abandoned field. Therefore, food web studies must take into account within-habitat heterogeneity when determining sampling scale and food web-related ecosystem processes. |
| Nota: |
This work is part of the project "Multitrophic interactions in the arthropod community of an organic citrus grove", funded by the Spanish government (MCyT; CGL2010-18182/BOS) and whose principal researcher is Josep Piñol. |
| Drets: |
Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.  |
| Llengua: |
Anglès |
| Col·lecció: |
Facultat de Biociències. Treballs de màster i postgrau. Màster en Ecologia Terrestre i Gestió de la Biodiversitat |
| Document: |
Treball de fi de postgrau |
| Matèria: |
δ13C ;
δ15N ;
Arthropod community ;
Trophic structure ;
Trophic shift |
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