Homing behaviour of juvenile coral reef fishes

This dataset contains the raw data associated with the following publication: Streit, R. P., & Bellwood, D. R. (2017).High prevalence of homing behaviour among juvenile coral reef fishes and the role of body size. Coral Reefs, 36, 1083-1095. doi:10.1007/s00338-017-1600-yThis data details the results of a study involving displacement of juvenile reef fishes across seven species, conducted in early 2016 across five sites in the lagoon of Lizard Island on the northern Great Barrier Reef. The intent of this study was to displace fishes and assess their behaviour and success at returning home to their previously occupied sites. This behaviour can give insights into long-term site fidelity or connectivity of individual fishes and fish populations. Juvenile fishes were chosen to assess when in a fish's life a "sense of home" develops. Fishes were displaced over a maximum of 150m, between four sites, as well as at a control site, where fishes were caught, handled and tagged in the same way, yet re-released at the original catch site. Across all sites, the location of individual fishes was recorded 5 times after release, with a maximum of one week post release. For methodological details as well as a map for the study site, please see the published manuscript (reference above) or contact robert.streit [at] my.jcu.edu.auDetails on included variables: FAMILY/ SPECIES:   taxonomic identity of each fish (note: parrotfishes are classed as "Scarus sp." since juveniles could not be reliably identified to species level)DISTANCE:   displacement distance, i.e. approximate linear distance between catch- and release-site of each fishTL / SL:   Total length (TL) and standard length (SL) of each fish, measured using callipers during tagging (fishes had been individually tagged with unique colour-coded visual-implant-elastomer tags)HOMED:   binomial variable indicating whether a fish successfully homed during the 1 week under observation, (1 = homed, 0 = not homed)STAYED:   binomial variable indicating whether a fish remained at the release site after displacement, (1 = stayed/remained, 0 = did not stay)LOST:   binomial variable indicating whether a fish became 'lost' (i.e. unobserved) during the 1 week under observation, this category includes fishes that were not re-observed due to mortality or relocation outside of our searched areas. (1 = lost, 0 = not lost)CATCHSITE / RELEASESITE: ID of each fish's catch and release site, including 4 displacement sites (A,B,C,D) and one control siteCURRENT_DIRECTION: approximation of water current direction relative to displacement, based on approximate wind direction (northerly / southerly) on each day of displacement and orientation of study sites. (2 = non-displaced control fishes, no current, 1 = displaced against the current, 0 = displaced with the current)Fate_6h / Fate_24h / Fate_48h / Fate_96h / Fate_1w:   Fate ('homed', 'stayed at release site' or 'lost') of each fish during each of the five observation periods (6h after release, 24h after release, 48h after release, 96h after release and 1 week after release)TIME_UNTIL_FIRST_HOMING:   Time in hours until fish was first recorded to have homed, i.e. re-observed at catch site after displacement. POST_HOMING_FIDELITY:   number of observation periods during which fish remained at home site after having returned home, i.e. did not disappear again.P.H.FIDELITY_HOURS:  Post homing fidelity (as above) but expressed in hours, not "observation periods"

本数据集包含与以下学术论文相关的原始数据：Streit, R. P., & Bellwood, D. R. (2017). 《幼年珊瑚礁鱼类归巢行为的高普遍性及其体型的作用》，《珊瑚礁》，36卷，第1083-1095页，DOI: 10.1007/s00338-017-1600-y。

本数据集详细记录了一项研究的成果：该研究于2016年初在大堡礁北部蜥蜴岛泻湖的5个采样点开展，针对7个物种的幼年礁栖鱼类进行了位移实验。本研究的核心目标为通过将鱼类转移至异地，评估其返回原栖息位点的行为模式与成功率。此类行为可用于解析鱼类个体及种群的长期位点保真度或连通性。研究选取幼年鱼类作为研究对象，旨在探究鱼类在生命历程中“家园认知”的形成节点。

实验设置如下：研究人员将鱼类转移至最远150米外的4个位移位点，同时设置1个对照位点：在对照位点中，鱼类以相同流程被捕获、处理并植入标记，随后原地释放。所有采样点中，研究人员在鱼类释放后的1周内共开展5次位置追踪记录。

关于研究的方法论细节及研究位点地图，请参阅上述已发表的学术论文，或联系邮箱robert.streit [at] my.jcu.edu.au获取相关信息。

以下为数据集包含的变量详情：
1. **FAMILY/ SPECIES**：每条鱼类的分类学身份（注：由于无法可靠地将幼鱼鉴定至物种水平，鹦嘴鱼被归类为“Scarus sp.”）
2. **DISTANCE**：每条鱼类的捕获位点与释放位点之间的近似直线位移距离
3. **TL / SL**：每条鱼类的总长度（TL）与标准长度（SL），由研究人员在标记时使用游标卡尺测量得到（每条鱼类均被植入唯一的彩色视觉植入弹性体标签）
4. **HOMED**：二分类变量，用于标识观测1周内鱼类是否成功归巢（1=归巢，0=未归巢）
5. **STAYED**：二分类变量，用于标识鱼类在被位移后是否滞留在释放位点（1=滞留，0=未滞留）
6. **LOST**：二分类变量，用于标识鱼类在观测1周内是否“失联”（即未被观测到），该类别包含因死亡或迁移至搜索范围外而未被再次观测到的鱼类（1=失联，0=未失联）
7. **CATCHSITE / RELEASESITE**：每条鱼类的捕获位点与释放位点ID，包含4个位移位点（A、B、C、D）与1个对照位点
8. **CURRENT_DIRECTION**：基于位移当日的近似风向（北/南风）与研究位点的朝向，估算的相对于位移方向的水流方向（2=未位移的对照鱼类，无水流影响；1=逆水流位移；0=顺水流位移）
9. **Fate_6h / Fate_24h / Fate_48h / Fate_96h / Fate_1w**：每条鱼类在5个观测时段（释放后6小时、24小时、48小时、96小时及1周）的结局，分为“归巢”“滞留释放位点”或“失联”三类
10. **TIME_UNTIL_FIRST_HOMING**：鱼类首次被记录归巢（即位移后在捕获位点被重新观测到）的耗时，单位为小时
11. **POST_HOMING_FIDELITY**：鱼类返回原栖息地后，仍滞留在该位点的观测时段数量，即未再次失联的时长
12. **P.H.FIDELITY_HOURS**：以小时为单位表示的归巢后保真度，与上述POST_HOMING_FIDELITY定义一致，区别在于不以观测时段为统计单位