Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/36326
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Título : Missing and forbidden links in mutualistic networks
Autor : Olesen, Jens M., Bascompte, Jordi, Dupont, Yoko L., Elberling, Heidi, Rasmussen, Claus, Jordano, Pedro
Palabras clave : Arctic
Climate
Mediterranean shrubland
mismatch
pollination
seed dispersal
Fecha de publicación : Sep-2010
Editor: Royal Society (Great Britain)
Citación : Proc. R. Soc. B (2011) 278, 725–732
Resumen: Ecological networks are complexes of interacting species, but not all potential links among species are rea- lized. Unobserved links are either missing or forbidden. Missing links exist, but require more sampling or alternative ways of detection to be verified. Forbidden links remain unobservable, irrespective of sampling effort. They are caused by linkage constraints. We studied one Arctic pollination network and two Mediter- ranean seed-dispersal networks. In the first, for example, we recorded flower-visit links for one full season, arranged data in an interaction matrix and got a connectance C of 15 per cent. Interaction accumulation curves documented our sampling of interactions through observation of visits to be robust. Then, we included data on pollen from the body surface of flower visitors as an additional link ‘currency’. This resulted in 98 new links, missing from the visitation data. Thus, the combined visit – pollen matrix got an increased C of 20 per cent. For the three networks, C ranged from 20 to 52 per cent, and thus the percen- tage of unobserved links (100 2 C ) was 48 to 80 per cent; these were assumed forbidden because of linkage constraints and not missing because of under-sampling. Phenological uncoupling (i.e. non-overlapping phe- nophases between interacting mutualists) is one kind of constraint, and it explained 22 to 28 per cent of all possible, but unobserved links. Increasing phenophase overlap between species increased link probability, but extensive overlaps were required to achieve a high probability. Other kinds of constraint, such as size mismatch and accessibility limitations, are briefly addressed.
Versión del editor: http://rspb.royalsocietypublishing.org/content/278/1706/725.full.pdf+html?sid=0181e1d0-1e2e-4482-8c83-88395984c365
URI : http://hdl.handle.net/10261/36326
DOI: 10.1098/rspb.2010.1371
Citación : Proc. R. Soc. B (2011) 278, 725–732
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