Long-term persistence of the floating bull kelp Durvillaea antarctica from the South-East Pacific: Potential contribution to local and transoceanic connectivity
Author
dc.contributor.author
Tala, Fadia
Author
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López, Boris A.
Author
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Velásquez, Marcel
Author
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Jeldres, Ricardo
Author
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Macaya, Erasmo C.
Author
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Mansilla, Andrés
Author
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Ojeda, Jaime
Author
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Thiel, Martin
Admission date
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2019-10-30T15:40:21Z
Available date
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2019-10-30T15:40:21Z
Publication date
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2019
Cita de ítem
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Marine Environmental Research, Volumen 149,
Identifier
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18790291
Identifier
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01411136
Identifier
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10.1016/j.marenvres.2019.05.013
Identifier
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https://repositorio.uchile.cl/handle/2250/172596
Abstract
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Current knowledge about the performance of floating seaweeds as dispersal vectors comes mostly from mid latitudes (30°–40°), but phylogeographic studies suggest that long-distance dispersal (LDD) is more common at high latitudes (50°–60°). To test this hypothesis, long-term field experiments with floating southern bull kelp Durvillaea antarctica were conducted along a latitudinal gradient (30°S, 37°S and 54°S) in austral winter and summer. Floating time exceeded 200d in winter at the high latitudes but in summer it dropped to 90d, being still higher than at low latitudes (<45d). Biomass variations were due to loss of buoyant fronds. Reproductive activity diminished during long floating times. Physiological changes included mainly a reduction in photosynthetic (Fv/Fm and pigments) rather than in defence variables (phlorotannins and antioxidant activity). The observed long floating persistence and long-term acclimation responses at 54°S support the hypothesis of LDD by kelp rafts at high latitudes.
Long-term persistence of the floating bull kelp Durvillaea antarctica from the South-East Pacific: Potential contribution to local and transoceanic connectivity