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Ecotypic differentiation in light-related traits of the kelp Laminaria saccharina

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Abstract

Light-related traits were compared for Laminaria saccharina Lamour. collected from three habitats in Maine and New York, USA, with different ambient light regimes. Light-level, expressed as a proportion of surface irradiance (I0), ranged from 0.04 to 0.32 I0 in the shallow habitat, but rarely exceeded 0.04 I0 in the deep and turbid habitats. Juvenile sporophytes collected from each habitat in April, 1985, were grown at four acclimation light-levels (0.065, 0.12, 0.26, and 0.54 I0) in a common-garden, laboratory experiment. Photosynthesis vs irradiance (PI) parameters, light-harvesting characteristics, and rates of carbon-assimilation and growth were determined for each group of plants. The results indicated that ecotypic differentiation had occurred among the three kelp populations. Photosynthetic capacity (Pmax) and photosynthetic efficiency (α) were generally highest for plants from the turbid habitat, lowest for deep plants, and intermediate for shallow plants. These differences were largely attributable to variations in light-harvesting characteristics. The nature and magnitude of photoacclimation responses also differed among populations. Population differences in photosynthetic parameters resulted in different rates of C-assimilation and growth by plants from shallow, deep, and turbid habitats. Predictions of in situ growth rates indicated that the severity of light-limitation and, therefore, the adaptive significance of efficient light-utilization vary among the three populations. It is concluded that ecotypic differentiation in light-related traits is important to the broad environmetal range of L. saccharina.

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Authors and Affiliations

  1. Marine Sciences Research Center, State University of New York, 11794, Stony Brook, New York, USA

    V. A. Gerard

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  1. V. A. Gerard
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Communicated by J. P. Grassle, Woods Hole

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Gerard, V.A. Ecotypic differentiation in light-related traits of the kelp Laminaria saccharina . Mar. Biol. 97, 25–36 (1988). https://doi.org/10.1007/BF00391242

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