Spatial distribution and reproductive phenology of sexual and asexual Mastocarpus papillatus (Rhodophyta).
Spatial distribution and reproductive phenology of sexual and asexual Mastocarpus papillatus (Rhodophyta).
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DOI：
10.2216/ph09-41.1
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发表时间：
2010-05-01
期刊：
影响因子：
1.6
通讯作者：
Dudgeon SR
中科院分区：
文献类型：
--
作者：
Fierst JL;Kübler JE;Dudgeon SR
Mastocarpus属的物种表现出两个不同的生活史，世代交替的有性生殖和专性的，无性的直接生活史，只产生雌性直立复叶。在潮间带红层中，M.沿着沿着东北太平洋海岸，南方种群以有性叶为主，北方种群以无性叶为主，这种空间分离的模式称为地理单性生殖。沿着加州的中部海岸，有性和无性变异体发生在混合种群中，但不知道它们是否在给定地点的潮间带内空间分离。我们调查了生殖物候和分析的空间分布格局的有性和无性M。在这一地区的三个地点。性M.乳突藻在两个地点的海岸较低处聚集，仅在一年的部分时间内繁殖，而无性繁殖的M.乳头状出现在整个潮间带的所有网站，并在全年繁殖。有性和无性M.的海岸线地形影响其动态的扩散和殖民化的假设是一致的。空间和时间的分区可能有助于长期共存的有性和无性生活史，在这个和其他物种的Mastocarpus。在多个空间尺度上研究了M.乳头状瘤提供了一个深入了解这一现象的机会。
Species of the genus Mastocarpus exhibit two distinct life cycles, a sexual alternation of generations and an obligate, asexual direct life cycle that produces only female upright fronds. In the intertidal red alga, M. papillatus (Kützing) sexual fronds dominate southern populations and asexual fronds dominate northern populations along the northeast Pacific coast, a pattern of spatial separation called geographic parthenogenesis. Along the central coast of California, sexual and asexual variants occur in mixed populations, but it is not known whether they are spatially separated within the intertidal zone at a given site. We investigated reproductive phenologies and analyzed patterns of spatial distributions of sexual and asexual M. papillatus at three sites in this region. Sexual M. papillatus were aggregated lower on the shore at two sites and only reproduced during part of a year, while asexual M. papillatus occurred throughout the intertidal range at all sites and reproduced throughout the year. The distribution patterns of sexual and asexual M. papillatus are consistent with a hypothesis of shoreline topography influencing their dynamics of dispersal and colonization. Spatial and temporal partitioning may contribute to the long-term coexistence of sexual and asexual life histories in this, and other, species of Mastocarpus. The occurrence of geographic parthenogenesis at multiple spatial scales in M. papillatus provides an opportunity to gain insight into the phenomenon.