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Light and temperature demands for growth and reproduction of laminarian gametophytes in southern and central California

Abstract

The gametophytes of 9 laminarian species (4 from southern California, and 5 from central California, USA) became fertile in the unicellular stage (female gametophytes) or in a few-celled stage (male gametophytes), when appropriate temperatures and a sufficiently high quantum irradiance in the blue part of the spectrum were supplied. Vegetative growth, leading to the formation of filamentous gametophytes was light-saturated at relatively low irradiances (4 W m-2; equivalent to about 2 nE cm-2 sec-1 or an illuminance of 1000 lux), whereas 2 to 3 times this irradiance in continuous fluorescent cool white light was needed to induce the majority of the gametophytes to become fertile. An illuminance of 8300 lux did not inhibit the development of the gametophytes from southern Californian species. Egregia menziesii exhibited an exceptionally low quantum demand for induction of fertility. Gametophytes of species from central and southern California differed in regard to their temperature optimum for growth (12°C in the former, 17°C in the latter) and their upper temperature limit for reproduction (17°C in the former, 20°C in the latter).

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Communicated by O. Kinne, Hamburg

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Lüning, K., Neushul, M. Light and temperature demands for growth and reproduction of laminarian gametophytes in southern and central California. Mar. Biol. 45, 297–309 (1978). https://doi.org/10.1007/BF00391816

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Keywords

  • Vegetative Growth
  • White Light
  • Female Gametophyte
  • High Quantum
  • Male Gametophyte