Mycobiota associated with the rhodophyte alien species Asparagopsis taxiformis (Delile) Trevisan de Saint‐Léon in the Mediterranean Sea          下载免费PDF全文

Laura Garzoli  Giorgio Gnavi  Giovanna C. Varese  Anna M. Picco 《Marine Ecology》2015,36(4):959-968

This study is the first to investigate and characterize the mycobiota associated with the alien species Asparagopsis taxiformis, a rhodophyte classified as one of the ‘100 worst invasive species’ in the Mediterranean Sea by the Hellenic Center for Marine Research, as it threatens biodiversity. Fungal endophyte and epiphyte communities were investigated on algal specimens from two sampling sites on the island of Linosa (Marine Protected Area Isole Pelagie, Italy). 87% of the 24 specimens that were analysed for epiphytes displayed a microfungal colonization. No endophytes were found. Only a small amount of microfungi was found to be associated with this alga. Only five fungal taxa were isolated; two of which are sporadically associated with the alga, while three, Eurotium rubrum, Cladosporium cladosporioides and Cladosporium pseudocladosporioides, seem to be related to A. taxiformis. This scarcity could be related to algal chemical composition.  相似文献   

广东省实施海洋牧场与海上风电融合发展的可行性分析     

陈灏  孙省利  张才学  冯岚 《海洋通报》2022,(2)

海洋牧场是修复海洋生态环境和涵养近海渔业资源的新模式, 而海上风电是我国新的清洁能源产业。本文在分析广 东省海上风电场建设的基础上, 分析了马尾藻藻礁建设在海洋风电场的适宜性和投放条件, 探讨了在广东省开展以人工藻礁 场 ＋ 海上风电场为特点的融合发展模式的可行性, 以及对于生态用海 、生态管海和海域资源集约节约利用的必要性。研究 认为“海洋牧场 ＋ 海上风电”的发展模式将成为未来提高海域综合利用水平的重要发展方向。  相似文献   

自然和人类活动作用下月湖沉积物有机质来源及其演变   总被引：2，自引：0，他引：2  

赵宁  杨旸  高建华  刘毅飞  蔡廷禄  贾建军 《地球化学》2014,(4):365-374

潟湖海湾可以保存环境演化和人类活动的良好记录,碳氮元素含量及同位素特征可用来有效地反演这些演化。对位于山东半岛的月湖柱状样和沿岸表层样总有机碳、总氮、稳定碳氮同位素的分析表明,陆源物质对月湖沉积物和有机质的贡献很小,其沉积物中有机质的主要来源是维管植物大叶藻和各种海洋藻类。在2002年前大约140 a的沉积历史中,大叶藻对沉积物有机质的贡献比例呈上升趋势,其中在约1930年和1980年有两次明显的上升,前者可能因为种群的快速繁育,后者则可能是1979年口门筑坝后由于湾内环境恶化,大叶藻开始大量死亡的表现。月湖海洋藻类的有机碳埋藏通量在沉积记录中保持相对稳定,而大叶藻则增加了一倍,但两者都有一定程度的波动。研究结果表明自然环境演变（如沙嘴生长、口门缩小）和人类活动（如筑坝、修筑虾池）对月湖生态环境及有机碳埋藏的影响在沉积物中有清晰的记录。  相似文献   

Experimental assessment of Posidonia oceanica‐associated gastropods grazing on an early‐successional biofilm community: nutrient availability and species‐specific effects          下载免费PDF全文

Inés Castejón‐Silvo  Jorge Terrados 《Marine Ecology》2017,38(1)

Although grazing is considered an essential process controlling epiphyte biomass on seagrass leaves, there is still a lack of fundamental knowledge about the species‐specific consumption rates of the most common grazers in Mediterranean meadows. This study experimentally assessed the effect of Posidonia oceanica‐associated gastropod grazing on early successional biofilm and the species‐specific relationship between biofilm consumption rates and biofilm biomass. Two biofilms on artificial substrata, both developed in situ (in a P. oceanica meadow), one under ambient conditions and the other under nutrient‐enriched conditions, were offered in aquaria assays to nine species of grazers found in P. oceanica meadows. Biofilm consumption rates and their association with biofilm biomass were assessed. It was found that: (i) there was a positive association between biofilm consumption and biofilm biomass up to 20 mg Chl a·m^?2 for Bittium reticulatum, Gibbula ardens, Jujubinus exasperatus and Tricolia pullus; (ii) Alvania montagui, B. reticulatum and Jujubinus striatus showed the highest consumption rates and are thus expected to be amongst the leading consumers in early‐successional epiphytic communities; (iii) there was not an increase of consumption rate when a substratum colonized under nutrient‐enriched conditions was offered to any of the nine studied species. This study provides species‐specific consumption rates knowledge that is useful for the assessment of the strength of grazer–epiphyte interactions and trophic fluxes in P. oceanica meadows.  相似文献   

NFMG法培养发菜的研究   总被引：4，自引：0，他引：4  

高彦仪  郝燕 《中国沙漠》1999,19(4):407-410

采用NFMG法获得发菜藻种,经人工控制条件下的培养,成功地培养出肉眼可见的发菜藻体,表明人工培养发菜初获成功。  相似文献   

从藻类化石的垂直分布探讨杭州西湖的演变历程   总被引：4，自引：0，他引：4  

项斯端  赵建康  周宏  王江毅 《海洋与湖沼》1999,30(1):14-24

于１９９４年春在杭州西湖东北面,西面及湖中心小瀛洲３个钻孔共取了７０号岩芯样,经浮选,筛选,以显微镜检鉴定化石藻种,并分析其垂直分布,从而探讨西湖的形成历史,西湖自晚更新世以来的６个化石藻带由下而上依次为：轮藻带,微藻带,微红金颗藻－近缘针杆藻－条纹小环藻带,圆筛藻带,圆筛藻－近缘针杆藻－微红金颗藻桥穹藻－异极藻－短缝藻带和水花束丝藻带,从而反映了西湖的６个发育时期,淡水古湖沼期,淡咸水过渡期,海  相似文献   

东太平洋锰结核中叠层石纹层韵律的研究   总被引：1，自引：0，他引：1  

黄瑾  张富生  林承毅  边立曾  陈建林  沈华悌 《海洋学研究》1999,(3)

综合运用反光显微镜、扫描电镜、透射电镜等手段研究了东太平洋深海锰结核中微小叠层石纹层的韵律。研究表明, 锰结核中叠层石纹层是超微生物韵律性生长的结果, 而且在锰结核的磨光面上清楚地显示出纹层、纹层组和纹层带三个级别的生长韵律。每个纹层、纹层组和纹层带的平均厚度分别为 ５１６ μｍ 、５５１ μｍ 和 ５５６ μｍ 。根据微生物生长的一般规律以及锰结核中的间断现象倾向性地认为, 锰结核中纹层的生长周期可能在数十年或近百年。  相似文献   

西沙群岛原绿藻的超微构造研究     

孙爱淑  曾呈奎 《海洋与湖沼》1998,29(4):347-352

于1981年3月在西沙群岛永兴岛采集原绿藻标本。用光镜和电镜对所采原绿藻进行研究。结果表明,原绿藻为简单的原核、单细胞藻类,在同一生境的相同宿主体表有4种不同的细胞构造类型：第1种类型,中央大“液泡”,类囊体单条、平行分散于周围区的细胞质中;第2种类型,中央是大“液泡”,周围区内类囊体多,并形成垛叠;第3种类型,许多小泡充满细胞的大部分,类囊体穿插于小泡之间;第4种类型,有中央大“液泡”,还有许多小泡分散在细胞周围区。上述分类以类囊体和“液泡”的结构和分布为主要分类依据,反映出不同结构的进化意义。表明中国西沙群岛有丰富的原绿藻资源。  相似文献   

How Sessile are Sea Anemones? A Review of Free-living Forms in the Actiniaria Cnidaria: Anthozoa   总被引：1，自引：0，他引：1  

KARIN RIEMANN-ZÜRNECK 《Marine Ecology》1998,19(4):247-261

Abstract. There is scattered information in the literature that sea anemones are not always sedentary but instead may temporarily or permanently live loosely attached, detached or even pelagically. This is the first attempt to summarize and assess these observations and their probable ecological significance for the life cycles of the respective species. According to current knowledge there are no truly pelagic species of sea anemones; thus, the 'Minyadidae' sensu C arlgren , 1949 have to be abolished as a taxonomic group. Instead, there are indications that there are phases and stages within the life course of many anemone species which are liable to lead a free life in response to abiotic and biotic environmental factors. Juvenile, post-metamorphic stages seem to be of major significance in these respects and may be subjected to long distance dispersal. It is speculated that some of these free-living stages may represent morphologically and/or ecologically different stages between larvae and adults. The newly discovered lifestyle of 'straying predator' is described from sublittoral habitats off South Africa.  相似文献   

大连石庙鲍育苗池冬!春季底栖藻类组成初探     

王起华  林碧琴  丁明进  何信  程爱华 《海洋科学》1998,22(1):51-54

对大连石庙鲍育苗池冬,春季底栖藻类的组成作了调研,共发现藻类５７种（含变种）,其中有２４种及变种为辽宁省新记录。藻类组成有如下特点：硅藻种类比较丰富;冬、春季藻类群落组成有一定的主次,演替表现十分明显,种类的重现率不高。  相似文献