Seed dispersal networks in the Galápagos and the consequences of alien plant invasions
Alien plants are a growing threat to the Galápagos unique biota. We evaluated the impact of alien plants on eight seed dispersal networks from two islands of the archipelago. Nearly 10 000 intact seeds from 58 species were recovered from the droppings of 18 bird and reptile dispersers. The most dispersed invaders were Lantana camara, Rubus niveus and Psidium guajava, the latter two likely benefiting from an asynchronous fruit production with most native plants, which facilitate their consumption and spread. Lava lizards dispersed the seeds of 27 species, being the most important dispersers, followed by small ground finch, two mockingbirds, the giant tortoise and two insectivorous birds. Most animals dispersed alien seeds, but these formed a relatively small proportion of the interactions. Nevertheless, the integration of aliens was higher in the island that has been invaded for longest, suggesting a time-lag between alien plant introductions and their impacts on seed dispersal networks. Alien plants become more specialized with advancing invasion, favouring more simplified plant and disperser communities. However, only habitat type significantly affected the overall network structure. Alien plants were dispersed via two pathways: dryfruited plants were preferentially dispersed by finches, while fleshy fruited species were mostly dispersed by other birds and reptiles. © 2012 The Author(s) Published by the Royal Society. All rights reserved.
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Royal Society (Great Britain)
2013
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Subjects: | Mutualistic interactions, Frugivory, Oceanic islands, Ornithochory, Saurochory, Exotics, |
Online Access: | http://hdl.handle.net/10261/110941 http://dx.doi.org/10.13039/100007406 |
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dig-ipna-es-10261-1109412021-12-28T15:52:16Z Seed dispersal networks in the Galápagos and the consequences of alien plant invasions Heleno, Rubén H. Olesen, Jens M. Nogales, Manuel Vargas, Pablo Traveset, Anna Fundación BBVA Charles Darwin Foundation Parque Nacional Galápagos Fundación BBVA Mutualistic interactions Frugivory Oceanic islands Ornithochory Saurochory Exotics Alien plants are a growing threat to the Galápagos unique biota. We evaluated the impact of alien plants on eight seed dispersal networks from two islands of the archipelago. Nearly 10 000 intact seeds from 58 species were recovered from the droppings of 18 bird and reptile dispersers. The most dispersed invaders were Lantana camara, Rubus niveus and Psidium guajava, the latter two likely benefiting from an asynchronous fruit production with most native plants, which facilitate their consumption and spread. Lava lizards dispersed the seeds of 27 species, being the most important dispersers, followed by small ground finch, two mockingbirds, the giant tortoise and two insectivorous birds. Most animals dispersed alien seeds, but these formed a relatively small proportion of the interactions. Nevertheless, the integration of aliens was higher in the island that has been invaded for longest, suggesting a time-lag between alien plant introductions and their impacts on seed dispersal networks. Alien plants become more specialized with advancing invasion, favouring more simplified plant and disperser communities. However, only habitat type significantly affected the overall network structure. Alien plants were dispersed via two pathways: dryfruited plants were preferentially dispersed by finches, while fleshy fruited species were mostly dispersed by other birds and reptiles. © 2012 The Author(s) Published by the Royal Society. All rights reserved. We are grateful to the Fundacio´n BBVA (Spain) for financing this project and to the Charles Darwin Foundation and the Gala´pagos National Park (Ecuador) for crucial logistical support in the archipelago Peer Reviewed 2015-02-20T14:05:40Z 2015-02-20T14:05:40Z 2013 2015-02-20T14:05:40Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1098/rspb.2012.2112 issn: 0962-8452 Proceedings of the Royal Society B: Biological Sciences 280(1750): 20122112 (2013) http://hdl.handle.net/10261/110941 10.1098/rspb.2012.2112 http://dx.doi.org/10.13039/100007406 23173203 Postprint http://dx.doi.org/10.1098/rspb.2012.2112 open Royal Society (Great Britain) |
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Mutualistic interactions Frugivory Oceanic islands Ornithochory Saurochory Exotics Mutualistic interactions Frugivory Oceanic islands Ornithochory Saurochory Exotics |
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Mutualistic interactions Frugivory Oceanic islands Ornithochory Saurochory Exotics Mutualistic interactions Frugivory Oceanic islands Ornithochory Saurochory Exotics Heleno, Rubén H. Olesen, Jens M. Nogales, Manuel Vargas, Pablo Traveset, Anna Seed dispersal networks in the Galápagos and the consequences of alien plant invasions |
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Alien plants are a growing threat to the Galápagos unique biota. We evaluated the impact of alien plants on eight seed dispersal networks from two islands of the archipelago. Nearly 10 000 intact seeds from 58 species were recovered from the droppings of 18 bird and reptile dispersers. The most dispersed invaders were Lantana camara, Rubus niveus and Psidium guajava, the latter two likely benefiting from an asynchronous fruit production with most native plants, which facilitate their consumption and spread. Lava lizards dispersed the seeds of 27 species, being the most important dispersers, followed by small ground finch, two mockingbirds, the giant tortoise and two insectivorous birds. Most animals dispersed alien seeds, but these formed a relatively small proportion of the interactions. Nevertheless, the integration of aliens was higher in the island that has been invaded for longest, suggesting a time-lag between alien plant introductions and their impacts on seed dispersal networks. Alien plants become more specialized with advancing invasion, favouring more simplified plant and disperser communities. However, only habitat type significantly affected the overall network structure. Alien plants were dispersed via two pathways: dryfruited plants were preferentially dispersed by finches, while fleshy fruited species were mostly dispersed by other birds and reptiles. © 2012 The Author(s) Published by the Royal Society. All rights reserved. |
author2 |
Fundación BBVA |
author_facet |
Fundación BBVA Heleno, Rubén H. Olesen, Jens M. Nogales, Manuel Vargas, Pablo Traveset, Anna |
format |
artículo |
topic_facet |
Mutualistic interactions Frugivory Oceanic islands Ornithochory Saurochory Exotics |
author |
Heleno, Rubén H. Olesen, Jens M. Nogales, Manuel Vargas, Pablo Traveset, Anna |
author_sort |
Heleno, Rubén H. |
title |
Seed dispersal networks in the Galápagos and the consequences of alien plant invasions |
title_short |
Seed dispersal networks in the Galápagos and the consequences of alien plant invasions |
title_full |
Seed dispersal networks in the Galápagos and the consequences of alien plant invasions |
title_fullStr |
Seed dispersal networks in the Galápagos and the consequences of alien plant invasions |
title_full_unstemmed |
Seed dispersal networks in the Galápagos and the consequences of alien plant invasions |
title_sort |
seed dispersal networks in the galápagos and the consequences of alien plant invasions |
publisher |
Royal Society (Great Britain) |
publishDate |
2013 |
url |
http://hdl.handle.net/10261/110941 http://dx.doi.org/10.13039/100007406 |
work_keys_str_mv |
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_version_ |
1777669720173969408 |