We investigated life history and the effects of temperature, irradiance, and seawater salinity on the early development of Mazzaella japonica (Mikami) Hommersand under laboratory conditions. Samples were collected from Dalian City in China in different seasons from 2012 to 2015. Based on single-factor and orthogonal experiments, we explored the effects of the three ecological factors and their interactions and observed the changes in morphology at each stage of early development and life history. Results indicated that (1) early development included three stages: early phase spore division, discoid crust development, and upright thallus growth; (2) the life history of M. japonica included homotypic gametophytes (haploid), carposporophytes (diploid), and tetrasporophytes (diploid). The gametophytes were morphologically identical to the tetrasporophytes and showed characteristic isomorphic alternation of generations; (3) carpospores grew normally within the temperature range of 5–25 °C, with 15 °C being optimal; (4) carpospore development and the increase in discoid crust diameter were both fastest at an irradiance of 80 μmol photons m−2 s−1; (5) the seawater salinity range for normal carpospore growth was 20–35‰, with 30‰ being optimal.
Journal of Applied Phycology – Springer Journals
Published: Dec 15, 2017
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