Growth rates and ecology of coralline rhodoliths from the Ras Ghamila back reef lagoon,Red Sea          下载免费PDF全文

Annalisa Caragnano  Daniela Basso  Graziella Rodondi 《Marine Ecology》2016,37(4):713-726

Rhodoliths are important marine carbonate producers that provide habitat for several marine organisms, and are threatened by ongoing global climate change. Meter‐sized sedimentary patches rich in living rhodoliths, interspersed among corals, were discovered in the back reef of Ras Ghamila lagoon, Southern Sinai, at less than 1 m water depth. In this shallow and relatively sheltered subtropical environment, rhodoliths were found to be monospecific or oligospecific, spheroidal, 3.5 to 9.4 cm in maximum diameter, with warty/lumpy or fruticose (protuberance degree IV) growth forms, and corresponded to the unattached branches or praline type. They grew in bright light under seasonal, moderate, wind‐driven water motion. The dominant rhodolith‐forming species recorded were: Lithophyllum kotschyanum, Porolithon onkodes, Hydrolithon sp. and three species of Neogoniolithon: Neogoniolithon fosliei, Neogoniolithon brassica‐florida, and an undescribed species noted in the text as Neogoniolithon sp. A total of 38 Alizarin‐stained rhodoliths was released in the field and collected after 1 year. They showed different banding patterns (alternating long and short cells) that revealed seasonal growth, with the lowest rates occurring in winter for all species, and an additional summer growth slackening in Neogoniolithon fosliei. Lithophyllum kotschyanum presented evidence of occasional growth cessation, possibly due to temporary burial. The observed annual growth rate of rhodoliths was unrelated to their size. The mean accretion rates were 1.08 mm · year^?1 in L. kotschyanum, 0.75 mm · year^?1 in P. onkodes, 0.49 mm · year^?1 in Hydrolithon sp., 0.85 mm mm · year^?1 in N. fosliei, 0.63 mm · year^?1 in N. brassica‐florida and 0.57 mm · year^?1 in Neogoniolithon sp. The annual mean marginal elongation rate for these taxa was respectively 8.74, 13.92, 3.59, 9.40 and 9.25 mm · year^?1, with the exception of Neogoniolithon sp., for which this parameter was not recorded. Maximum marginal elongation occurred in P. onkodes pointing out its greater ability as a space competitor in comparison with the other rhodolith species. The highest accretion rate and common presence of L. kotschyanum indicate its importance as carbonate producer in tropical reef.  相似文献   

浙江南麂列岛有节珊瑚藻(红藻门Rhodophyta)的分类研究     

陈彦伟  姜晶晶  丁兰平  黄冰心  陈万东  林利 《海洋与湖沼》2020,51(1):163-175

利用冷冻切片技术,通过形态学和解剖学方法,对采自我国东海沿岸浙江南麂列岛的大型海洋红藻珊瑚藻目(Corallinales)的有节类群进行了分类学研究。经鉴定,共发现珊瑚藻目有节类群2属5种,分别为珊瑚藻科Corallinaceae叉节藻亚科Amphiroideae叉节藻属Amphiroa的带形叉节藻A.beauvoisii;珊瑚藻亚科Corallinoideae珊瑚藻属Corallina的鳞形珊瑚藻C.confusa、粗枝珊瑚藻C.crassisima、珊瑚藻C.officinalis和小珊瑚藻C.pilulifera。通过较为清晰的解剖学特征图片,对该5种有节珊瑚藻外部形态和内部特征进行了详细的比较与描述。结合近年来国际上有关上述部分物种的分类地位变化,对我国现存的带形叉节藻A.zanata、粗扁节藻Bossiella cretacea和大边孢藻Marginisporum crassissimum的归并问题展开了详细分析与讨论,以期促进对珊瑚藻目海藻分类学有更加深入的理解。  相似文献