Culture studies on the life history of Chordaria Linearis (Phaeophyceae) from Tierra del Fuego, South America

Peters, Akira F. (1992) Culture studies on the life history of Chordaria Linearis (Phaeophyceae) from Tierra del Fuego, South America Journal of Phycology, 28 (5). pp. 678-683. DOI 10.1111/j.0022-3646.1992.00678.x.

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Studies of laboratory cultures of Chordaria linearis (Hooker et Harvey) Cotton from southernmost South America revealed that this species has an obligate sexual life history in which a macroscopic sporophyte alternates with a monoecious microscopic gametophyte. Sexual reproduction is isogamous and under photoperiodic control. Gametes are produced only in short days, whereas in long days, asexual zoospores are formed that recycle the gametophyte generation. Unfused gametes develop into gametophytes, and sporophytes originate only from zygotes. Unlike other sexual members of the Chordariales, gametes of C. linearis have a reduced stigma and do not show phototaxis. They are released at the beginning of the night, not in the morning. In nature, C. linearis seems to be regularly infected by a dictyosiphonalean epiphyte resembling the rare arctic species Trachynema groenlandicum (Lund) Pedersen. The epiphyte is responsible for previous contradictory results obtained in laboratory cultures of C. linearis. This is the first record of Trachynema in the southern hemisphere.

Document Type: Article
Keywords: Chordaria linearis; ej1iphyte; life history; Phaeophyceae; photoperiod; sexuality; South America; Trachynema groenlandicum
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
DOI etc.: 10.1111/j.0022-3646.1992.00678.x
ISSN: 0022-3646
Date Deposited: 09 Mar 2018 14:12
Last Modified: 09 Mar 2018 14:12

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