Redd characteristics and implications for survival of Chinook salmon (Oncorhynchus tshawytscha) embryos in the Waitaki River, New Zealand
Redd characteristics and implications for survival of Chinook salmon (Oncorhynchus tshawytscha) embryos in the Waitaki River, New Zealand
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新西兰怀塔基河奇努克鲑鱼 (Oncorhynchus tshawytscha) 胚胎的 Redd 特征及其生存意义
DOI：
10.1080/00288330.1993.9516585
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发表时间：
1993
影响因子：
1.6
通讯作者：
G. James
中科院分区：
文献类型：
--
作者：
K. Deverall;J. Kelso;G. James
摘要在冰川源干流的三个地点和怀塔基河下游主要是小型支流的两个地点测量了奇努克鲑鱼（Oncorhynchus tshawytscha）的redd特征。平均redd大小为17.5平方米; redd长度为2.4至10米，宽度为1.2至9.5米。水深（平均值± SD = 0.37 ± 0.09 m）和水流速度（平均值0.68 ± 0.27 m s-1）在两个主茎位置之间存在显著差异，但这可能是由于现场条件的差异而不是鲑鱼的偏好。在所有红层中，基质渗透性、通过基质的水流速（此处称为表观流速）和氧气都很高，对早期鱼类生命阶段的任何“压力”可能是由于过度的渗透性（> 55.0 m h−1）和表观流速（> 0.15 m h−1），而不是基质中水循环不足。虽然鲑鱼没有利用所有可用的产卵栖息地，在原地redd条件一般。
Abstract Chinook salmon (Oncorhynchus tshawytscha) redd characteristics were measured at three locations in the glacially‐sourced mainstem and two locations in small, primarily rainfed, tributaries of the lower Waitaki River. Mean redd size was 17.5 m2 ; lengths of redds ranged from 2.4 to 10 m and their widths ranged from 1.2 to 9.5 m. Water depth (mean ± SD = 0.37 ± 0.09 m) and water velocity (mean 0.68 ± 0.27 m s−1 ) were significantly different between two of the mainstem locations but this may have resulted from differences in site conditions rather than preference by salmon. Substrate permeability, water flow rate through the substrate (termed apparent velocity herein) and oxygen were high in all redds and any “stress” to early fish life stages would likely result from excessive permeabilities (> 55.0 m h−1 ) and apparent velocities (> 0.15 m h−1 ) rather than inadequate water circulation in the substrate. Although salmon did not use all available spawning habitat, in situ redd conditions generally ...