台湾海峡中北部海洋线虫群落的种类组成及分布

Studies on species composition and distribution of marine nematode communities in central and northern Taiwan Strait

:1 998年 2月对台湾海峡中北部 3个断面 1 3个取样站进行了自由生活海洋线虫调查 ,获得了海洋线虫 1 0 0种 ,隶属于 3目 2 8科 91属 .其中密度较高的种有萨巴线虫 (Sabatieriasp .1 )、变异矛咽线虫 (Dorylaimopsisvariabilis)、Vasostomasp .、花斑线虫 (Spilophorellasp .)、吞咽线虫 (Daptonemasp .)、Linhysterasp .1、吸咽线虫(Halalaimussp .1 )和 (Filoncholaimussp .)等 .虽然这些海洋线虫绝大多数只鉴定到属 ,但它们在台湾海峡是新记录 .从断面平均值看 ,海洋线虫密度由围头近海向闽江口外海降低 .从优势种分布看 ,不同取样站其密度差异很大 .海洋线虫的取食类型以选择性食沉积物者 (1A)占优 ,有 38种 ,但刮食性种类 (2A)和非选择性食沉积物者(1B)也分别为 2 9种和 2 5种 ,表明了台湾海峡中北部海洋线虫取食类型的复杂性 .文中还探讨了海洋线虫分布与海流等环境因子的关系 .

Marine free living nematodes were investigated at 13 sampling stations divided into three transects in central and northern Taiwan Strait in February 1998. One hundred species of marine nematodes belonging to 3 Orders, 28 Families and 91 Genera were identified and were new records in central and northern Taiwan Strait. The dominant species in density were Sabatieria sp.1, Dorylaimopsis variabilis, Vasostoma sp., Spilophorella sp., Daptonema sp., Linhystera sp.1, Halalaimus sp.1, Filoncholaimus sp. and so on. According to the mean density at transects, marine nematode density decreased from the sea area near Weitou coast to the sea area off Minjiang Estuary, which was similar to polychaete distribution in central and northern Taiwan Strait. The selective deposit feeder (1A) was the dominant food type of marine nematodes, but non selective deposit feeders (1B) and epigrowth feeders (2A) occupied high proportion, which showed that feeding types of marine nematodes in central and northern Taiwan Strait was diverse. Some environmental factors such as marine current were discussed.