Relationships of Dissolved Oxygen with Chlorophyll-a and Phytoplankton Composition in Tilapia Ponds
Relationships of Dissolved Oxygen with Chlorophyll-a and Phytoplankton Composition in Tilapia Ponds
复制标题
罗非鱼池塘溶解氧与叶绿素a及浮游植物组成的关系
DOI：
10.4236/ijg.2013.45b008
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
L. Lebel
中科院分区：
文献类型：
--
作者：
K. Kunlasak;C. Chitmanat;N. Whangchai;J. Promya;L. Lebel
研究了罗非鱼养殖池中溶解氧、叶绿素a和浮游植物组成之间的关系。每个池塘（共18个池塘）在1月至3月的干燥冬季和5月至6月的雨季初分别取样一次。通过检验季节、海拔高度和培养系统对参数之间的相关性，对数据进行了分析。在泰国北方选定的5个省进行了观测：清莱、清迈、法尧、南邦和那空沙旺。这些地区的平均海拔范围从25米到582米不等，并被归类为低海拔（400米）地区。池塘深0.8 ~ 2.0m，面积0.16 ~ 0.64ha，可分为高、低投入系统，冬季平均气温16.5 ~ 35.8°C，平均水温25.5 ~ 27.1°C。雨季气温在22.0°C - 37.3°C之间，水温在29.4°C - 31.8°C之间。两个季节的叶绿素a含量相近（p > 0.05），但高输入系统的叶绿素a含量显著高于低输入系统（p < 0.05）。叶绿素a、DOmax和DOmin之间仅存在弱相关性。采用多因素方差分析方法，分析了不同海拔、不同养殖方式和不同季节池塘中细菌总数和丝状蓝藻数量的差异。结果表明，海拔、养殖方式和季节之间存在显著的交互作用（p < 0.05）。2个季节的浮游植物种类多样性和组成表明，浮游植物的存在下，所有7个部门的90属。绿藻门和蓝藻门在两个季节中鉴定的属数最多，其中盘星藻属，和栅藻属，和鱼腥藻（Anabaena spp.）分别为优势属/属。
This study investigated the relationships among the parameters of dissolved oxygen, chlorophyll-a and phytoplankton composition in tilapia ponds. Each pond (a total of 18 ponds) was sampled once in the dry, winter season between January and March and again early in the rainy season between May and June. The data were analyzed by examining correlations among parameters as affected by season, altitude and culture system. Observations were made at sites located in 5 selected provinces of northern Thailand: Chiangrai, Chiangmai, Phayao, Lampang and Nakornsawan. Mean elevation of these areas range from 25 to 582 meters above sea level (masl) and were categorized into low ( 400 masl) elevation sites. Ponds were 0.8 - 2.0 m deep, 0.16 - 0.64 ha in area and could be further categorized into high and low input systems.Mean air temperature in winter ranged between 16.5°C - 35.8°C while mean water temperature ranged between 25.5°C - 27.1°C. In rainy season, air temperature ranged between 22.0°C - 37.3°C and water temperature ranged between 29.4°C - 31.8°C. The amount of chlorophyll-a in both seasons were comparable (p > 0.05), but chlorophyll-a in high input system was significantly higher (p < 0.05) than in low input ponds. Only weak correlation was found between chlorophyll-a, DOmax and DOmin. Multifactor-ANOVA was used to analyze the difference of total bacteria and filamentous cyanobacteria in ponds based upon elevation, culture systems and season. Result shows that there is a significant interaction observed between elevation, culture system and season (p < 0.05). Species diversity and composition of phytoplankton in fish ponds in 2 seasons revealed the presence of 90 genera of phytoplankton under all 7 divisions. Divisions Chlorophyta and Cyanophyta had the most number of genera identified in both seasons with Pediastrum spp., and Scendesmus spp., and Anabaena spp. as dominant genera/genus, respectively.