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Title

Variabilidad interespecífica y dimorfismo sexual en la forma y tamaño del pico de cuatro petreles subantárticos que nidifican en simpatría

AuthorsTrallero Pérez, Lucía
AdvisorNavarro, Joan ; Farré, Marc
Issue DateJun-2017
PublisherUniversidad de Barcelona
AbstractThe presence of variation in specific morphological structures may indicate the existence of ecological differences between species or sexes. In birds, the bill is one of the structures that may be most affected by this selective processes because itis a structure directly involved with the acquisition of food. In the present study,we assessed the existence of differences in bill size and shape of four planktivorous Subantarctic seabirds of the order Procellariiformes, which coexist during the breeding season.The main aim isto relate these differences with their trophic ecology and other biological strategies,which help to better understand phenomena such as their resources partitioning, competition and coexistence. We also investigated the existence of sexual dimorphism in the shape and size of the bill. For these purposes, we used both linear measurements for bill size and landmark-based geometric morphometric methods for bill shape. The results showed that P. desolata and H. caerulea differed completely in size and shape from the two diving petrels, which they overlapped in bill shape. These differences may be due to differences in diet or factors such as diving strategy, bird calls or the development of the olfactory system. We also observed the existence of sexual dimorphism in the bill in all four species, both in size and shape, except for P. georgicus (we only found dimorphism in bill size) and P. desolata (only in bill shape). However, we could not directly relate these differences in relation to the natural selection for lack of studies in foraging ecology comparing males and females in these four seabirds. Finally, the results demonstrate that geometric morphometric methods are valid and innovative techniques in studie sof detection of sexual dimorphism, confirming the relation between the shape and size of the bill with essential factors of the biology of these species
DescriptionTrabajo final presentado por Lucía Trallero Pérez para el Máster de Biodiversidad de la Universitat de Barcelona (UB), realizado bajo la dirección del Dr. Joan Navarro Bernabé y del Dr. Marc Farré Foix del Institut de Ciències del Mar (ICM-CSIC).-- 28 pages, 6 figures, 4 tables, annexes
URIhttp://hdl.handle.net/10261/211699
Appears in Collections:(ICM) Tesis
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