Riosmena-Rodríguez R, Hinojosa-Arango G, López-Vivas J M, León-Cisneros K, Holguin-Acosta E
Programa de Botánica Marina, Departamento de Biología Marina, Universidad Autónoma de Baja California Sur. Apdo. Postal 19-B, La Paz B.C.S. 23080 México.
Rev Biol Trop. 2005 Mar-Jun;53(1-2):97-109.
Macroalgal studies in Baja California Sur have dealt mainly with occurrence and seasonality, but some areas are poorly known even for these basic data. Bahia del Rincón-La Rivera is an important high-productivity fisheries area where coastal infrastructure development is under way. A spatial characterization of the marine flora from Bahia del Rincón-La Rivera was done by intensive sampling at different depths and localities with skin and SCUBA diving. At least 500 m2 were surveyed in each site. Additionally. quantitative sampling was done in ten random 25 cm2 quadrates per site. In the intertidal section, density and cover estimates were used. We also investigated the historical records and geographical affinities. A total of 72 species were identified (most were red algae: 62%). We found no general trend in the biogeographical affinities, which varied with each taxonomic group. Most brown algae species were tropical-endemic; red algae temperate-cosmopolite and green algae tropical-cosmopolite. In the spatial assemblage structure we found a high similarity between the intertidal areas, but a low similarity in shallow or deeper areas (3-5 m). This pattern was the same when we compared the abundance of the main species. We suggest that there are significant spatial differences in recruitment and development of the assemblages in relation to vertical distribution (depth) and position along the shore. There is a clear-cut Gelidium-Jania belt in the intertidal zone and a Padina-Dictyota belt below the low tide. Sporadic and year-round species occur in the intertidal zone, annual and perennial species below the low tide line. Sites differ in recruitment and this affects the abundance of other species (such as coraline and Caulerpa species). Temperature and sedimentation affect seasonality, but community structure is relatively constant throughout the year.
南下加利福尼亚州的大型海藻研究主要涉及分布情况和季节性，但即使是这些基础数据，在一些地区也鲜为人知。巴伊亚·德尔林孔-拉里韦拉是一个重要的高生产力渔业区，目前正在进行沿海基础设施建设。通过皮肤潜水和水肺潜水在不同深度和地点进行密集采样，对巴伊亚·德尔林孔-拉里韦拉的海洋植物群进行了空间特征描述。每个采样点至少调查了500平方米。此外，每个采样点在十个随机的25平方厘米样方中进行了定量采样。在潮间带区域，采用了密度和覆盖度估计方法。我们还研究了历史记录和地理亲缘关系。共鉴定出72个物种（大多数为红藻：62%）。我们发现生物地理亲缘关系没有普遍趋势，每个分类群都有所不同。大多数褐藻物种是热带特有种；红藻是温带广布种，绿藻是热带广布种。在空间组合结构方面，我们发现潮间带区域之间相似度较高，但浅水区或深水区（3 - 5米）相似度较低。比较主要物种的丰度时，情况也是如此。我们认为，组合的补充和发育在垂直分布（深度）和沿岸位置方面存在显著的空间差异。潮间带有一条明显的石花菜-叶叉藻带，低潮线以下有一条团扇藻-网地藻带。潮间带有零星的全年性物种，低潮线以下有一年生和多年生物种。不同采样点的补充情况不同，这影响了其他物种（如珊瑚藻和羽藻属物种）的丰度。温度和沉积作用影响季节性，但群落结构全年相对稳定。
