Benthic communities and biodiversity in Thai mangrove swamps

1. 在泰国Samut Songkram省的Klong Kone红树林沼泽进行了实地研究。在对红树林沼泽进行全面调查之后，我们沿着两条交易线选择了几个点进行详细采样。选择这些研究点是为了涵盖该地区的各种环境条件：从泥滩到红树林的陆地边缘。测定了沉积物的温度和Eh以及间隙水中的pH、盐度和营养物浓度。泥滩沉积物有机质含量低于森林内部。我们开始监控工作。我们分别对底栖动物和树木动物进行了定量和定性采样。在外泥滩中，经常见到甲壳虾、口足类和尾足类蟹。鸟蛤也很常见，多毛类蠕虫是常规的取样动物。在向西的前红树林边缘，底栖动物区系与泥滩相似。森林向陆缘有丰富的厌食蜗牛和浅海腹足动物。尾足蟹和芝麻蟹是红树林区系的重要成员。收集螃蟹进行胃内容物分析和异速测量研究。我们计划研究底栖动物对废弃红树林沼泽的再定殖过程。但是，这次我们找不到合适的地方进行这样的学习。对于一些有用动物的种群研究，我们选择了一种鸟蛤（Anadara）。壳大小的测量后,波纹被放进笼子里,在一些选定的情节遵循生存和增长。为了研究藤壶的定植过程，在几种不同的环境中设置了塑料杆作为监测工作的沉降基质。

1. Field studies were conducted at the Klong Kone mangrove swamps in Samut Songkram Province in Thailand. Following a general survey of the mangrove swamps, we selected several points for detailed samplings along two transact lines. These study points were selected in order to cover various environmental conditions in the area : from mud flat to landward fringe of the mangrove forest.2. Temperature and Eh of the sediments and pH,salinity and nutrient concentrations in the interstitial water were measured. Organic matters in the sediments at the mud flat were lower than those inside the forest. We started monitoring works.3. We studied benthic fauna and tree fauna separately, conducting both quantitative and qualitative samplings. In outer mud flat, an alphaeid shrimp, a stomatopod, and ocypodid crabs were regular species encountered. Cockle was also frequent and polychaete worms were regular animals to be sampled. In the seeward ex-mangrove fringe, benthic fauna was similar to that in the mud flat. In the landward fringe of the forest, erobid snails were abundant and neritid gastropod was also found. Two species of ocypodid crabs and sesarmid crabs were prominent members in the mangrove forest fauna. Crabs were collected for analysis of stomach content and allometry studies.4. We had planned to study recolonization process of the discarded mangrove swamps by benthic animals.However, we could not find appropriate places for such study this time.5. For population studies of some useful animals, we selected a cockle (Anadara). After measurement of shell size, cockles were put in the cages and set at several selected plots to follow survival and growth. For the studies of colonization processes of the barnacles, plastic poles were set at several different environments as the settlement substrate for monitoring works.