期刊
JOURNAL OF PHYCOLOGY
卷 37, 期 5, 页码 699-704出版社
WILEY-BLACKWELL
DOI: 10.1046/j.1529-8817.2001.00169.x
关键词
biomechanics; carrageenans; Chondrus crispus; material properties; Rhodophyta; strength, wave exposure; water motion
Chondrus crispus Stackhouse alternates between two isomorphic life history phases that differ in cell-wall phycocolloid composition. It has been long hypothesized that the gametophyte, with strong-gelling kappa-type carrageenans, is mechanically superior to the tetrasporophyte, with nongelling lambda-type carrageenans, which could contribute to the observed gametophytic dominance in many wave-swept environments. Standard mechanical tests were performed on distal tissues of C crispus sampled from a range of environments in Narragansett Bay, Rhode Island, using a tensometer equipped with a video extensometer. Life history phase was by far the most important determinant of mechanical properties, whereas environmental factors had only modest influence (vertical distribution) or no effect (exposure); gametophytic distal tissues were 43% stronger, 21% more extensible, and 21% stiffer than tetrasporophytic distal tissues. However, the superior strength of gametophytic tissues was not evident at the stipe/holdfast junction (where breakage typically occurs), and the two phases were equally susceptible to dislodgment by a given force. The primary ecophysiological role of carrageenans in C crispus may not be the provision of a structure to resist wave action.
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