Life history flexibility allows Sargassum
polyceratium to persist in different environments subjected to stochastic disturbance events |
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Authors: | Aschwin H Engelen Anneke M Breeman Jeanine L Olsen Wytze T Stam Per Åberg |
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Institution: | 1. Department of Marine Biology, Centre for Ecological and Evolutionary Studies (CEES), University of Groningen, P.O. Box 14, 9750, AA, Haren, The Netherlands 3. Centre for Marine Sciences (CCMAR), CIIMAR, Universidade do Algarve, FCMA, Campus de Gambelas, 8005-139, Faro, Portugal 2. Department of Marine Ecology, Marine Botany, University of G?teborg, Box 461, 40530, G?teborg, Sweden
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Abstract: | Stochastic, stage-based matrix models were used to investigate the life history strategy of the seaweed Sargassum polyceratium in shallow intertidal and deep-water (18 m) populations. Matrix models were parameterized with 3 years of yearly transitions among four plant stages quantified from three bays on Curaçao (Netherlands Antilles). There were years without a storm, with a moderate (winter) storm and with a strong storm (Hurricane Lenny). The stochastic population growth rate varied among populations (λs: 0.54–1.03) but was not related to depth. The most important stages for population growth were reproductive adults (shallow) and non-reproductive adults (deep). With the occurrence of storms, vegetative growth (mainly deep) and fertility (mainly shallow) became the most important processes. Recruitment (shallow) and regeneration from holdfasts (deep) only contributed to population persistence after the hurricane. It is concluded that S. polyceratium has a flexible, depth-dependent, life history strategy that is adjusted to disturbance events. |
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Keywords: | Sargassum polyceratium Stochastic matrix model Life history strategy Wave-disturbance events Depth |
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