Phylloicus hansoni larval population size structures in both predator-only and predator-third party stream settings

This data was collected in 2013 and 2011 in the southern slope of Trinidad’s Northern Range Mountains, within the Caroni River drainage. The dataset consists of larval caddisfly size distribution data across streams with different fish assemblages, with data on size, frequency and gut content data of predatory fish species.<br>The related study investigates the relationship between the size structures of the larval caddisfly (<i>Phylloicus hansoni</i> Denning) and different fish assemblages in Trinidadian streams in two settings:<b>KO:</b> Killifish-Only: upstream reaches where the predatory killifish, <i>Anablepsoides hartii</i>, is the only fish species<b>KG:</b> Killifish-Guppy: downstream reaches where killifish and the omnivorous guppy <i>Poecilia reticulata</i> coexist<br>The data files are four <b>.csv</b> text files, accessible via MS Excel, open office and openly accessible text edit applications.<br>___<br>The following data files are from 5 streams, each with reaches with differing fish assemblages in 2013.<br><br><b>PHYL-size_frequency_data.csv</b> - size frequency data consisting of body lengths and head capsule widths of caddisfly larvae:<b>- stream: </b>El Cedro = CED, Endler = END, Guard Dog Creek = GDC, Ramdeen = RDN, Trip Trace = TRT.<b>- reach:</b> stream setting - KG or KO<b>- instar.group: </b>HCW classification as Small = S (0.2 - 0.4 mm), Medium = M (0.5 - 0.8 mm), Large = L (0.9 - 1.1 mm)<b>- HCW:</b> head capsule width in mm<b>- count: </b>frequency<br><b>PHYL-site_survey_data.csv - </b>site survey data<b>(stream &amp; reach </b>see above)<br><b>- transect</b> - transect id in the format <b>TTTRRX</b> (TTT = transect, RR = reach, X= sequential numerical id)<b>- wetted.width </b>in cm<br><b>- depth </b>in cm<br><b>- canopy.cover</b> in %<br><b>- CBOM:</b> coarse benthic organic matter gm^-2<b>- CPUE: </b>catch per unit effort<br><br><b>PHYL-fish_size_class_data.csv </b>- killifish size class data, with mean CPUE for each size class at each stream/reach:<b>(stream &amp; reach </b>see above)<b><br></b><b>- fish.SC - </b>fish size classification: Juvenile = J (&lt; 15 mm), Small = S (15-30 mm), Medium = M (30-45 mm), Large = L (45-60 mm), and Extra-Large = XL (&gt; 60 mm)<b>- mean.CPUE</b>: mean CPUE (see above for definition) for specific stream and reach___<br>The following data was collected from killifish in 2011. Appropriate institutional permits were obtained.<br><b>PHYL-GCA_data.csv</b> - Gut content data (GCA) detailing <i>P. hansoni</i> in individual killifsh catches:<b>(stream, reach, fish.SC, HCW </b>see above)<br><b>- fish.size: </b>fish size in mm<b>- success: </b>1 = <i>P. hansoni</i> present, 0 = <i>P. hansoni</i> not present<b>- failure: </b>1 = <i>P. hansoni</i> not present, 0 = <i>P. hansoni</i> present<b>- instar: </b>instar size class - Juvenile = J, Small = S, Medium = M, Large = L, and Extra-Large = XL<br>___<br><b>Stoker-PHYL.R - </b>R code for analysis of data files listed above

本数据集采集于2011年与2013年，采样点位位于特立尼达北部山脉南坡的卡罗尼河（Caroni River）流域范围内。本数据集包含不同鱼类群落溪流中的石蛾幼虫（larval caddisfly）体型分布数据，同时涵盖捕食性鱼类的体型、出现频次及胃容物数据。

相关研究探讨了特立尼达溪流中两种生境下，石蛾*Phylloicus hansoni* Denning幼虫的体型结构与不同鱼类群落之间的关联：
- **KO**：仅有鱂鱼生境（Killifish-Only）：上游河段，捕食性鱂鱼*Anablepsoides hartii*为唯一鱼类物种
- **KG**：鱂鱼-孔雀鱼生境（Killifish-Guppy）：下游河段，鱂鱼与杂食性孔雀鱼*Poecilia reticulata*共存

本数据集包含4个逗号分隔值（.csv）文本文件，可通过MS Excel、OpenOffice及可公开访问的文本编辑应用程序打开。

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以下数据集来自2013年采集的5条溪流，每条溪流均包含具有不同鱼类群落的河段：

**PHYL-size_frequency_data.csv**：石蛾幼虫体型频次数据，包含体长与头囊宽度信息：
- 溪流编号：El Cedro = CED、Endler = END、Guard Dog Creek = GDC、Ramdeen = RDN、Trip Trace = TRT
- 河段类型：生境类型，即KG或KO
- 龄组分类（instar.group）：基于头囊宽度的分级，小型（S，0.2-0.4 mm）、中型（M，0.5-0.8 mm）、大型（L，0.9-1.1 mm）
- HCW：头囊宽度，单位为毫米
- count：个体出现频次

**PHYL-site_survey_data.csv**：样地调查数据（溪流与河段信息详见上文）：
- transect：样带编号，格式为**TTTRRX**（TTT=样带编号、RR=河段编号、X=连续数字标识）
- wetted.width：湿周宽度，单位为厘米
- depth：水深，单位为厘米
- canopy.cover：冠层盖度，单位为百分比
- CBOM：粗底栖有机物（coarse benthic organic matter）含量，单位为克每平方米（gm⁻²）
- CPUE：单位捕获努力量渔获量（catch per unit effort）

**PHYL-fish_size_class_data.csv**：鱂鱼体型分级数据，包含各溪流/河段各体型分级的平均CPUE：（溪流与河段信息详见上文）
- fish.SC：鱼类体型分级：幼鱼（J，＜15 mm）、小型（S，15-30 mm）、中型（M，30-45 mm）、大型（L，45-60 mm）、超大型（XL，＞60 mm）
- mean.CPUE：对应溪流与河段的平均CPUE（定义详见上文）

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以下为2011年采集的鱂鱼相关数据，本次采样已获得相关机构许可：
**PHYL-GCA_data.csv**：胃容物分析（Gut Content Analysis, GCA）数据，记录了单尾鱂鱼样本中*Phylloicus hansoni*的存在情况：（溪流、河段、fish.SC、HCW信息详见上文）
- fish.size：鱼类体长，单位为毫米
- success：1=检出*Phylloicus hansoni*，0=未检出*Phylloicus hansoni*
- failure：1=未检出*Phylloicus hansoni*，0=检出*Phylloicus hansoni*
- instar：龄组分级：幼鱼（J）、小型（S）、中型（M）、大型（L）、超大型（XL）

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**Stoker-PHYL.R**：用于分析上述数据集的R语言代码文件