Seasonal changes of fish diversity in the main channel of the large lowland River Oder
Seasonal changes of fish diversity in the main channel of the large lowland River Oder
复制标题
大低地奥德河主河道鱼类多样性的季节变化
DOI：
10.1002/rrr.645
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
A. Bischoff
中科院分区：
文献类型：
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作者：
C. Wolter;A. Bischoff
在1998年6月至2000年5月期间，在奥得河低地使用底拖网和在海岸线使用电捕鱼对成鱼进行了取样。本研究的重点是横向之间的连接通道和河流边缘的目的是描述的重要性，作为鱼类栖息地的通道中段。共采集了30个品种的15 660条鱼类样本，其中在水道中段采集了20个品种的8 169条鱼类样本，在海岸线采集了27个品种的7 491条鱼类样本。在海岸线，我们观察到显著较高的鱼类密度（345.4 ± 51.8鱼每1000 m3相比，5.2 ± 1.0，平均值±标准误差）和物种数量（11.1 ± 0.5，分别为5.2 ± 0.3），但是，3种鱼专门在中间通道和另外6个更频繁。中通道占主导地位的银鲷（Abramis bjoerkna）占总渔获量的75.6%。它通常由较大的鱼类定殖（22.1 ±0.12厘米总长度相比13.0±0.08厘米）。根据所观察到的显着的栖息地偏好，我们分类公会的河流物种，在他们的第一年的生活中通道的栖息地，并表现出最高的相对丰度。这个群体包括以下物种：银鲷、普通鲷（Abramis brama）、蓝鲷（Abramis ballerus）、白鳍鳕（Gobio albipinnatus）、桑德（Sander lucioperca）和鲶（Silurus glanis）。
Between June 1998 and May 2000 an adult fish sampling was carried out in the lowland River Oder using bottom otter trawls in the mid channel and electric fishing at the shorelines. This study focused on the lateral connectivity between mid channel and river margins with the aim to characterize the importance of mid-channel sections as fish habitat. Altogether 15 660 fish of 30 species were sampled, 8169 fish of 20 species in the mid-channel section and 7491 fish of 27 species at the shoreline. At the shoreline we observed significantly higher fish densities (345.4 ± 51.8 fish per 1000 m 3 compared to 5.2 ± 1.0, mean ± standard error) and numbers of species (11.1 ± 0.5, respectively, 5.2 ± 0.3), However, three species were exclusively in the mid channel and a further six more frequent there. The mid channel was dominated by silver bream (Abramis bjoerkna) representing 75.6% of the total catch. It was generally colonized by bigger fish (22.1 ±0.12 cm total length compared to 13.0±0.08 cm). According to the observed significant habitat preferences, we classified a guild of potamal species, which shift during their first year of life to mid-channel habitats and exhibited the highest relative abundance there. To this guild belong the following species: silver bream, common bream (Abramis brama), blue bream (Abramis ballerus), whitefin gudgeon (Gobio albipinnatus), zander (Sander lucioperca) and wels (Silurus glanis).