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TRADE-OFFS BETWEEN LIFE-HISTORY TRAITS AT RANGE-EDGE AND CENTRAL LOCATIONS

Artikel i vetenskaplig tidskrift
Författare R. Araujo
E. A. Serrao
I. Sousa-Pinto
F. Arenas
C. A. Monteiro
Gunilla B. Toth
Henrik Pavia
Per Åberg
Publicerad i Journal of Phycology
Volym 51
Nummer/häfte 4
Sidor 808-818
ISSN 0022-3646
Publiceringsår 2015
Publicerad vid Institutionen för biologi och miljövetenskap, Tjärnö marinbiologiska laboratorium
Institutionen för biologi och miljövetenskap
Sidor 808-818
Språk en
Länkar dx.doi.org/10.1111/jpy.12321
Ämnesord defence, growth, life-history traits, range-edge populations, reproduction, trade-offs, SEAWEED ASCOPHYLLUM-NODOSUM, REPRODUCTIVE EFFORT, MARGINAL POPULATIONS, STOCHASTIC ENVIRONMENTS, SEXUAL REPRODUCTION, FUCUS-VESICULOSUS, NATURAL-SELECTION, SPATIAL VARIATION, PATELLA-VULGATA, SOUTHERN LIMIT, Plant Sciences, Marine & Freshwater Biology
Ämneskategorier Biologiska vetenskaper

Sammanfattning

The allocation of resources to different life-history traits should represent the best compromise in fitness investment for organisms in their local environment. When resources are limiting, the investment in a specific trait must carry a cost that is expressed in trade-offs with other traits. In this study, the relative investment in the fitness-related traits, growth, reproduction and defence were compared at central and range-edge locations, using the seaweed Ascophyllum nodosum as a model system. Individual growth rates were similar at both sites, whereas edge populations showed a higher relative investment in reproduction (demonstrated by a higher reproductive allocation and extended reproductive periods) when compared to central populations that invested more in defence. These results show the capability of A. nodosum to differentially allocate resources for different traits under different habitat conditions, suggesting that reproduction and defence have different fitness values under the specific living conditions experienced at edge and central locations. However, ongoing climate change may threaten edge populations by increasing the selective pressure on specific traits, forcing these populations to lower the investment in other traits that are also potentially important for population fitness.

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