caa a22 4500 378902318 CHVBK 20180305123521.0 cr unu---uuuuu 161128e20041201xx s 000 0 eng 10.1515/BOT.2004.062 doi (NATIONALLICENCE)gruyter-10.1515/BOT.2004.062 Reproduction in the green macroalga Codium (Chlorophyta): characterization of gametes [Elektronische Daten] [Jeffrey S. Prince, Cynthia D. Trowbridge] A general description is provided for male and female gametes, their gametangia, and thalli of five species of the siphonaceous green macroalga Codium from Atlantic and Pacific shores. Both types of gametes were biflagellate, the flagella arising from a cap at the tip of the colorless extension of the hyaline apex, which also contained the nucleus. Male gametes were small (mean diameter for five species, 2.5μm; length ranged from 5 to 10μm) and had few chloroplasts; female gametes were considerably larger (mean diameter 11μm; length ranged from 11 to 21μm) with many chloroplasts. Monthly collections of C. isthmocladum indicated that female seasonality was broader than male seasonality and that hermaphroditic thalli were frequent. Comparison of these reproductive traits with reports for the invasive Codium, C. fragile ssp. tomentosoides, collected from the northwestern Atlantic coast suggested that 1) in localized areas, two subspecies or varieties may coexist, and 2) no functional male gametes were produced by C. fragile populations from this coastline. We speculate that Tokyo and Sagami Bays on the Pacific shores of Honshu, Japan, might contain the source populations for the invasive ssp. tomentosoides. Furthermore, we suggest that the extended presence of mature female thalli coupled with the apparent absence of mature male thalli might cause the prevalence of parthenogenesis in this genus. ©2004 by Walter de Gruyter Berlin New York Hydrobiology nationallicence Mycology, fungi nationallicence Botany & plant sciences nationallicence Codium nationallicence gametes nationallicence hermaphrodites nationallicence parthenogenesis nationallicence reproduction nationallicence Prince Jeffrey S. Department of Biology, The University of Miami, P.O. Box 249118, Coral Gables, Florida 33124, USA aut Trowbridge Cynthia D. Department of Zoology, Hatfield Marine Science Center, Oregon State University, Newport, Oregon 97365, USA aut Botanica Marina Walter de Gruyter 47/6(2004-12-01), 461-470 0006-8055 47:6<461 2004 47 botm https://doi.org/10.1515/BOT.2004.062 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/BOT.2004.062 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Prince Jeffrey S. Department of Biology, The University of Miami, P.O. Box 249118, Coral Gables, Florida 33124, USA aut NATIONALLICENCE 700 1- Trowbridge Cynthia D. Department of Zoology, Hatfield Marine Science Center, Oregon State University, Newport, Oregon 97365, USA aut NATIONALLICENCE 773 0- Botanica Marina Walter de Gruyter 47/6(2004-12-01), 461-470 0006-8055 47:6<461 2004 47 botm CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter