Abstract Additions of large wood (LW) have become a go-to technique for recovering altered river ecosystems. However, successful applications of this technique are generally limited to unchannelized rivers and headwater streams. Channelization of rivers, that is, engineering river channels to reduce recruitment and retention of in-channel structure, may, by definition, limit success of this restoration technique. Moreover, sufficient time has passed (a century or more) since initial channelization of many large rivers that portions of the fish community associated with LW may have become extirpated. Thus, the maxim that LW leads to a positive fish community response may not hold true. We examined fish community associations in habitats with and without LW in the channelized Missouri River to gain an understanding of the role of LW in large, channelized rivers. There were some differences between habitats with wood present compared to those without, but the differences were not evident once year, season and channel modifications intended to create aquatic habitat were taken into account. We assert that careful planning is necessary to ensure that additions of LW in channelized rivers are made to appropriate locations such that it will be retained in-channel for use as fish habitat and that LW-associated species are found in the system.

中文翻译：

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鱼类群落对渠道化河流系统中渠道内木质碎片的反应

摘要 添加大木头 (LW) 已成为恢复已改变河流生态系统的首选技术。然而，这种技术的成功应用通常仅限于未渠化的河流和源头溪流。河道化，即设计河道以减少河道内结构的补充和滞留，根据定义，可能会限制这种修复技术的成功。此外，自从许多大河最初形成沟渠以来，已经过去了足够长的时间（一个世纪或更长时间），与 LW 相关的部分鱼类群落可能已经灭绝。因此，LW 导致鱼类群落积极响应的格言可能不成立。我们检查了密苏里河沟渠中有和没有 LW 的栖息地中的鱼类群落协会，以了解 LW 在大型、渠道化河流。与没有木材的栖息地相比，有木材的栖息地之间存在一些差异，但一旦考虑到旨在创造水生栖息地的季节和渠道改造，差异就不明显了。我们断言，仔细规划是必要的，以确保将渠道化河流中的 LW 添加到适当的位置，以便将其保留在渠道内用作鱼类栖息地，并在系统中发现与 LW 相关的物种。