Emergence and lateral dispersal of adult Plecoptera and Trichoptera from Broadstone Stream, UK
Emergence and lateral dispersal of adult Plecoptera and Trichoptera from Broadstone Stream, UK
复制标题
DOI：
10.1046/j.1365-2427.1999.00466.x
复制
发表时间：
1999-11-01
影响因子：
2.7
通讯作者：
Gurney, WSC
中科院分区：
文献类型：
--
作者：
Petersen, I;Winterbottom, JH;Gurney, WSC
1. 1996-1997年，对英国南部酸性富铁河流布罗德斯通河中成年石蝇（Plecoptera）和石蛾（Trichoptera）的出现和内陆扩散进行了10个月的研究。在200米的范围内随机放置了15个金字塔形的羽化陷阱。三个Malaise陷阱被放置在流和六个以上的每一边（一个树木繁茂，一个开放）沿着一个样带在距离通道1，15，30，45，60和75米。超过16000石蝇，属于11种，和不到400石蛾（22种）被抓获。四种优势石蝇（Leuctra fusca，Leuctra nigra，Leuctra pictetii和Nemurella pictetii）分别占羽化和Malaise诱捕器捕获量的96%和95%。两种石蛾（Plectrocnemia conspersa和Potamophylax cingulatus）占63%的捕获量在Malaise陷阱。羽化诱捕器捕获的石蛾很少. L. fusca，L. nigra和L.虫的形态结构清晰，呈单峰型;皮克特期延长且不稳定。总体而言，女性（1 285人）多于男性（740人）。在溪流上方的Malaise陷阱中，雌性石蝇和石蛾占多数。在陆地上，L. fusca，L. nigra和P. cingulatus被捕获。其余物种的性别比没有显著偏离1：1.5。放置在溪流上方的三个Malaise陷阱捕获了大多数石蝇，尽管也有远离通道的分散，捕获的数量随着距离的增加而下降。指数模型解释了67%和99%之间的变化，在四个常见的石蝇与通道的距离的个人数量。一半的个体距离溪流不到11-16米，而90%的个体距离溪流不到51米。更重要的是L。nigra和N.在林地中捕获的pictetii比在开阔地捕获的要多，而在开阔地捕获的L.阿斯特丽普斯没有表现出对任何一方的总体偏好。
1. Emergence and inland dispersal of adult stoneflies (Plecoptera) and caddisflies (Trichoptera) from Broadstone Stream, an acidic and iron-rich stream in southern England, were studied over 10 months in 1996-1997. Fifteen pyramidal emergence traps were placed randomly in a 200-m stretch. Three Malaise traps were placed above the stream and six more on each side (one wooded, one open) along a transect at distances of 1, 15, 30, 45, 60 and 75 m from the channel.2. More than 16 000 stoneflies, belonging to 11 species, and just under 400 caddisflies (22 species) were caught. Four dominant stoneflies (Leuctra fusca, Leuctra nigra, Leuctra hippopus and Nemurella pictetii) accounted for 96% and 95% of the catches in the emergence and Malaise traps, respectively. Two caddisflies (Plectrocnemia conspersa and Potamophylax cingulatus) accounted for 63% of the catch in the Malaise traps. Few caddisflies were taken in emergence traps.3. The emergence periods of L. fusca, L. nigra and L. hippopus were well-defined and unimodal, whereas that of N. pictetii was prolonged and erratic. Overall, more females (1285) emerged than males (740).4. Female stoneflies and caddisflies were in the majority in the Malaise traps above the stream. On land, significantly more females than males of L. fusca, L. nigra and P. cingulatus were caught. The sex ratio of the remaining species did not deviate significantly from 1:1.5. The three Malaise traps placed above the stream caught most of the stoneflies though there was also dispersal away from the channel, the numbers caught declining with distance. Exponential models explained between 67% and 99% of the variation in numbers of individuals with distance from the channel in the four common stoneflies. Half the individuals went less than 11-16 m from the stream, while 90% travelled less than 51 m. Significantly more L. nigra and N. pictetii were caught in the woodland than on the open side, whereas L. hippopus showed no overall preference for either side.