Seed-dispersal networks on the Canaries and the Galápagos archipelagos: interaction modules as biogeographical entities
[Aim] Mutualistic network parameters, such as modularity and nestedness, show non-random linkage patterns. Both increase network stability in different ways. Modularity hampers extinction cascades, whereas nestedness resists network disassembly. We explore these parameters in seed-dispersal networks in two archipelagos and the significance of life history, habitat, geography and phylogeny as drivers of linkage patterns and the applicability of modules as biogeographical entities. [Location] Canaries (Atlantic Ocean) and Galápagos (Pacific Ocean). [Methods] We compiled data on plant–seed disperser interactions from own observations and the literature, estimated network parameters describing interaction patterns (connectance, nestedness and modularity) and constructed a backbone phylogeny for the analyses. [Results] The Canarian network was highly nested but weakly modular, whereas the Galápagos network showed the opposite characteristics. Most key network species are native and have a favourable conservation status. Modularity in the Canaries is correlated with habitats (indirectly affected by altitude and orientation), whereas in the Galápagos it mainly reflects the functional roles of species. [Main conclusions] The divergent link patterns for the archipelagos imply that the highly nested Canarian network is stable against disassembly, whereas the modular Galápagos network may show strong resistance against extinction cascades. This difference may be driven by the specific evolutionary dynamics on the archipelagos.
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John Wiley & Sons
2016-07
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dig-ipna-es-10261-1527262020-05-21T12:16:23Z Seed-dispersal networks on the Canaries and the Galápagos archipelagos: interaction modules as biogeographical entities Nogales, Manuel Heleno, Rubén H. Rumeu, Beatriz González-Castro, Aarón Traveset, Anna Vargas, Pablo Olesen, Jens M. Fundación BBVA Ministerio de Economía y Competitividad (España) [Aim] Mutualistic network parameters, such as modularity and nestedness, show non-random linkage patterns. Both increase network stability in different ways. Modularity hampers extinction cascades, whereas nestedness resists network disassembly. We explore these parameters in seed-dispersal networks in two archipelagos and the significance of life history, habitat, geography and phylogeny as drivers of linkage patterns and the applicability of modules as biogeographical entities. [Location] Canaries (Atlantic Ocean) and Galápagos (Pacific Ocean). [Methods] We compiled data on plant–seed disperser interactions from own observations and the literature, estimated network parameters describing interaction patterns (connectance, nestedness and modularity) and constructed a backbone phylogeny for the analyses. [Results] The Canarian network was highly nested but weakly modular, whereas the Galápagos network showed the opposite characteristics. Most key network species are native and have a favourable conservation status. Modularity in the Canaries is correlated with habitats (indirectly affected by altitude and orientation), whereas in the Galápagos it mainly reflects the functional roles of species. [Main conclusions] The divergent link patterns for the archipelagos imply that the highly nested Canarian network is stable against disassembly, whereas the modular Galápagos network may show strong resistance against extinction cascades. This difference may be driven by the specific evolutionary dynamics on the archipelagos. R.H. was funded by FCT grant IF/00441/2013 and the Marie-Curie CIG-321794. This study is framed within a biodiversity project in the Galápagos Islands, financed by BBVA Foundation (Spain) and by projects CGL2012-C02-01 and CGL2013-44386-P financed by Ministerio de Economía y Competitividad (Spain). Peer Reviewed 2017-07-13T11:30:01Z 2017-07-13T11:30:01Z 2016-07 2017-07-13T11:30:02Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1111/geb.12315 issn: 1466-8238 Global Ecology and Biogeography 25(7): 912-922 (2016) http://hdl.handle.net/10261/152726 10.1111/geb.12315 http://dx.doi.org/10.13039/100007406 http://dx.doi.org/10.13039/501100003329 Postprint https://www.doi.org/10.1111/geb.12315 Sí none John Wiley & Sons |
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[Aim]
Mutualistic network parameters, such as modularity and nestedness, show non-random linkage patterns. Both increase network stability in different ways. Modularity hampers extinction cascades, whereas nestedness resists network disassembly. We explore these parameters in seed-dispersal networks in two archipelagos and the significance of life history, habitat, geography and phylogeny as drivers of linkage patterns and the applicability of modules as biogeographical entities.
[Location]
Canaries (Atlantic Ocean) and Galápagos (Pacific Ocean).
[Methods]
We compiled data on plant–seed disperser interactions from own observations and the literature, estimated network parameters describing interaction patterns (connectance, nestedness and modularity) and constructed a backbone phylogeny for the analyses.
[Results]
The Canarian network was highly nested but weakly modular, whereas the Galápagos network showed the opposite characteristics. Most key network species are native and have a favourable conservation status. Modularity in the Canaries is correlated with habitats (indirectly affected by altitude and orientation), whereas in the Galápagos it mainly reflects the functional roles of species.
[Main conclusions]
The divergent link patterns for the archipelagos imply that the highly nested Canarian network is stable against disassembly, whereas the modular Galápagos network may show strong resistance against extinction cascades. This difference may be driven by the specific evolutionary dynamics on the archipelagos. |
author2 |
Fundación BBVA |
author_facet |
Fundación BBVA Nogales, Manuel Heleno, Rubén H. Rumeu, Beatriz González-Castro, Aarón Traveset, Anna Vargas, Pablo Olesen, Jens M. |
format |
artículo |
author |
Nogales, Manuel Heleno, Rubén H. Rumeu, Beatriz González-Castro, Aarón Traveset, Anna Vargas, Pablo Olesen, Jens M. |
spellingShingle |
Nogales, Manuel Heleno, Rubén H. Rumeu, Beatriz González-Castro, Aarón Traveset, Anna Vargas, Pablo Olesen, Jens M. Seed-dispersal networks on the Canaries and the Galápagos archipelagos: interaction modules as biogeographical entities |
author_sort |
Nogales, Manuel |
title |
Seed-dispersal networks on the Canaries and the Galápagos archipelagos: interaction modules as biogeographical entities |
title_short |
Seed-dispersal networks on the Canaries and the Galápagos archipelagos: interaction modules as biogeographical entities |
title_full |
Seed-dispersal networks on the Canaries and the Galápagos archipelagos: interaction modules as biogeographical entities |
title_fullStr |
Seed-dispersal networks on the Canaries and the Galápagos archipelagos: interaction modules as biogeographical entities |
title_full_unstemmed |
Seed-dispersal networks on the Canaries and the Galápagos archipelagos: interaction modules as biogeographical entities |
title_sort |
seed-dispersal networks on the canaries and the galápagos archipelagos: interaction modules as biogeographical entities |
publisher |
John Wiley & Sons |
publishDate |
2016-07 |
url |
http://hdl.handle.net/10261/152726 http://dx.doi.org/10.13039/100007406 http://dx.doi.org/10.13039/501100003329 |
work_keys_str_mv |
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1777669729589133312 |