Dispersal of stream salmonids from nests and stocking sites: patterns, variability, and sampling bias

To reconcile divergent views about the direction and distance that salmonids disperse from nests or release sites, we conducted a systematic search and synthesis of existing data that included 154 data points from 58 papers. After correcting for a sampling bias in the downstream direction, 56.6% of fish dispersed downstream, significantly greater than 50% but much less than expected. The best generalized linear mixed model (GLMM) explaining the percentage of fish moving downstream included a positive effect of the percentage of sampling effort downstream, a negative effect of body size, and differences among species; brown trout (Salmo trutta) tended to disperse upstream more than other species. Dispersal distance increased with body size; median dispersal distance for age 0+ and older fish was 167 m and 908 m, respectively, implying much greater mobility than expected. As predicted, median dispersal distance was greater downstream (715 m) than upstream (602 m). Our analyses indicated t..., We used keywords to search the Web of Science for all are articles with quantitative data on the dispersal of salmonid fishes from nests or stocking sites on October 15, 2022. We identified 247 or which 58 produced 154 data points for our analysis. We recorded information about the direction of fish movement (percentage of fish that moved upstream and downstream from the release site) and the distance of fish movement (median and maximum sampling distance and dispersal distance in each direction)., , # Raw data for: Dispersal of stream salmonids from nests and stocking sites: patterns, variability, and sampling bias

[https://doi.org/10.5061/dryad.nk98sf83n](https://doi.org/10.5061/dryad.nk98sf83n)

## Description of the data and file structure

Quantification of the direction and distance of movement of salmonid fishes from nests or stocking sites.

### Files and variables

#### File: Grant_and_Weir_data_sets.xlsx (dispersal.data and dispersal.stack)

**Description:** dispersal.data and dispersal.stack

##### Variables

study: assigned a number from 1 to 58 alphabetically by first author

author: last name of first author

year of publication

species: (OC=Cutthroat Trout; OM=Masu Salmon; SF=Brook Trout; SG=Rainbow Trout; SS=Atlantic Salmon; ST=Brown Trout; TT=European Grayling)

country: where work was carried out

age: average age of fish (0+, 1+, or 2+)

age.2: 0=fish were age 0+; 1=fish were age 1+ or 2+

length: average length of fish in mm

mass: average mass of fish in g

re...,

为调和学界关于鲑科鱼类（salmonids）从巢穴或释放位点扩散的方向与距离的分歧观点，我们开展了系统性的数据检索与综合分析，共纳入来自58篇文献的154组数据点。在校正下游方向的采样偏差后，结果显示56.6%的个体向下游扩散——该比例显著高于随机水平（50%），但远低于此前预期。解释下游扩散个体占比的最优广义线性混合模型（Generalized Linear Mixed Model, GLMM）显示，下游采样强度呈正向影响，体尺呈负向影响，且不同物种间存在差异；褐鳟（*Salmo trutta*）相较于其他物种更倾向于向上游扩散。扩散距离随体尺增大而增加：0龄及以上个体的中位扩散距离分别为167米与908米，这意味着其移动能力远高于此前预期。正如预测，下游方向的中位扩散距离（715米）显著高于上游方向（602米）。我们的分析表明……

我们于2022年10月15日通过关键词检索Web of Science，筛选所有包含鲑科鱼类从巢穴或放流位点扩散定量数据的文献。初筛共获取247篇文献，其中58篇符合研究要求，最终提取154组数据点用于本分析。我们记录了鱼类移动方向的相关信息（释放位点处向上游与下游移动个体的占比），以及鱼类移动距离的相关参数（各方向的中位与最大采样距离、扩散距离）。

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# 原始数据集：溪流鲑科鱼类从巢穴与放流位点的扩散：模式、变异性与采样偏差
[https://doi.org/10.5061/dryad.nk98sf83n](https://doi.org/10.5061/dryad.nk98sf83n)

## 数据与文件结构说明
本数据集量化了鲑科鱼类从巢穴或放流位点的移动方向与距离。

### 文件与变量
#### 文件：Grant_and_Weir_data_sets.xlsx（包含dispersal.data与dispersal.stack）
**描述：** dispersal.data 与 dispersal.stack
##### 变量
study：按第一作者姓氏字母顺序分配的1至58的编号
author：第一作者姓氏
year：发表年份
species：物种代码（OC=切喉鳟（Cutthroat Trout）；OM=马苏大马哈鱼（Masu Salmon）；SF=溪鳟（Brook Trout）；SG=虹鳟（Rainbow Trout）；SS=大西洋鲑（Atlantic Salmon）；ST=褐鳟（Brown Trout）；TT=欧洲河鳟（European Grayling））
country：研究开展国家
age：受试鱼类的平均年龄（0+、1+或2+龄）
age.2：0代表受试鱼类为0+龄；1代表受试鱼类为1+龄或2+龄
length：受试鱼类的平均体长，单位为毫米（mm）
mass：受试鱼类的平均体质量，单位为克（g）
re...