Vertical Plankton Tow (VPT) data from 1997 - 2003 from multiple cruises from the Northeast Pacific, California Current System (NEP project)

<p>This project was designed to make a comparison of the effects of coastal upwelling on the population dynamics and vital rates of the euphausiids Euphausia pacifica and Thysanoessa spinifera in the Northern California Current, north and south of Cape Blanco, Oregon.</p>

<p>These data are part of a project which describes the population dynamics of these two GLOBEC target organisms. The nets sampled along several transect lines off the central Oregon coast&nbsp; for the purpose of describing temporal variations in euphausiid abundance, recruitment, vital rates and production. A high-frequency sampling program will be supplemented with bimonthly cruises sampling along four transect lines: two off Oregon (Newport and Coos Bay) and two off northern California (Crescent City and Eureka) during GLOBEC Long-Term Observations Program (L-TOP) cruises. Data from these survey cruises will provide information on spatial variations in euphausiid biomass, numerical abundance, vital rates and production in the waters throughout the GLOBEC study region (Newport OR south to Eureka CA). The project proposed here has four objectives:<br />
<br />
(1) determine the seasonal cycles of abundance of the two euphausiid species in relation to interannual variations in circulation, hydrography and upwelling;<br />
(2) determine the seasonal, interannual and spatial variations in egg production rates, cohort development, and recruitment as a function of upwelling and phy toplankton blooms;<br />
(3) examine the seasonal, interannual and spatial variations in mortality rates and production as a means to develop a better understanding of euphausiid population dynamics; and<br />
(4) determine overwintering strategies and the role of seasonal reversals in circulation and the spring transition in redistributing euphausiids in shelf and slope waters.</p>

<p>All of the above data will be passed to one of the GLOBEC modelers (H. Batchelder, Univ. of California at Berkeley) who is developing an individual-based model for both euphausiid species; the proposed work is presented in the context of examining the relationship between the ecology of euphausiids and salmonid growth and survival.</p>

<p>The VPT data are organized on the GLOBEC server by cruise within year. The master page (Level 0) lists all of the cruises in chronological order. Clicking on a cruise will show all of the casts collected/processes from that cruise (Level 1). Clicking on a cast will bring up the Level 2 file that shows a single line with additional header information for a sample. Clicking on the sample_id (always \"1\" for this type of data) will display the Level 3 data, which are the actual taxonomic categories and abundances for that particular sample. Additional info about the variables are described below.</p>

<p>&nbsp;</p>

<table border=\"1\">
<tbody>
<tr>
<th>Program Codes</th>
<th>Description</th>
</tr>
<tr>
<td>LTOP</td>
<td>samples collected on Long-term Observation Program Cruises (ca. 4-6 cruises per year; all sample the Newport Hydrographic (NH) Line; some sample other standard lines further south)</td>
</tr>
<tr>
<td>NH</td>
<td>more frequent, small vessel, nearshore sampling of Newport Hydrographic Line</td>
</tr>
<tr>
<td>MESO_1</td>
<td>samples collected from process cruise in June 2000</td>
</tr>
<tr>
<td>MESO_2</td>
<td>samples collected from process cruise in August 2000</td>
</tr>
</tbody>
</table>

<p>&nbsp;</p>

<table border=\"1\">
<tbody>
<tr>
<th>Life Stage Info Codes<br />
(partial listing)</th>
<th>Description</th>
</tr>
<tr>
<td colspan=\"2\">most are self explanatory; Male, Female, CV =&gt; Copepodite 5, Zoea, Nauplii, N2 =&gt; Nauplius 2, Egg--a few are not, esp. for the euphausiids (Thysanoessa and Euphausia)</td>
</tr>
<tr>
<td>F2</td>
<td>Second Stage Furcilia (aka Furcilia 2)</td>
</tr>
<tr>
<td>F3</td>
<td>Third Stage Furcilia (aka Furcilia 3)</td>
</tr>
<tr>
<td>F1_0</td>
<td>First Stage Furcilia with 0 legs</td>
</tr>
<tr>
<td>F2_32 or Furcilia_2_3L2S</td>
<td>Second Stage Furcilia with 3 pairs of legs total, with 2 pairs of legs having setae; this xLyS pattern is common, with x and y varying depending on stage of development</td>
</tr>
</tbody>
</table>

<p>(See Hooff and Peterson, 2006)</p>

本项目旨在对比海岸上升流对北加利福尼亚海流中，俄勒冈州布兰科角南北两侧海域内两种磷虾——太平洋磷虾（Euphausia pacifica）与棘刺磷虾（Thysanoessa spinifera）的种群动态及生命率的影响。

本数据集隶属于一项旨在阐明上述两种GLOBEC（全球海洋生态系统动力学研究，Global Ocean Ecosystem Dynamics）目标物种种群动态的研究项目。研究团队沿俄勒冈州中部沿岸的多条断面布设网具采样，以解析磷虾丰度、补充量、生命率及生产量的时间变化特征。在GLOBEC长期观测计划（Long-Term Observations Program, L-TOP）航次期间，高频采样计划将辅以双月航次采样，采样断面共4条：两条位于俄勒冈州沿岸（纽波特（Newport）与库斯湾（Coos Bay）），两条位于北加利福尼亚沿岸（新月城（Crescent City）与尤里卡（Eureka））。上述调查航次所获数据，将为GLOBEC研究区域（从俄勒冈州纽波特向南延伸至加利福尼亚州尤里卡）内磷虾生物量、个体丰度、生命率及生产量的空间变化特征提供支撑。本拟建项目共设定四项研究目标：
1. 明确两种磷虾物种丰度的季节周期，及其与环流、水文状况及上升流的年际变化之间的关联；
2. 解析产卵率、世代发育及补充量的季节、年际与空间变化特征，揭示其与上升流及浮游植物水华的响应关系；
3. 探究死亡率与生产量的季节、年际及空间变化规律，以深化对磷虾种群动态机制的认知；
4. 阐明磷虾的越冬策略，以及环流季节反转与春季跃变在陆架及陆坡水域中重新分布磷虾种群的作用。

上述全部数据将移交至GLOBEC建模团队成员之一——加利福尼亚大学伯克利分校的H. Batchelder博士，其正针对这两种磷虾物种开发个体水平模型；本拟建研究将围绕磷虾生态学与鲑科鱼类生长及存活之间的关联展开。

VPT数据按航次及年份整理存储于GLOBEC服务器。主页面（层级0）按时间顺序列出所有航次；点击某一航次，将显示该航次采集/处理的全部站位（Level 1）；点击某一站位，将弹出层级2文件，该文件以单一行展示对应样品的附加表头信息；点击sample_id（此类数据的sample_id恒为"1"），将显示层级3数据，即该特定样品的实际分类类群与丰度信息。变量的补充说明详见下文。

| 项目代码 | 说明 |
| ---- | ---- |
| LTOP | 长期观测计划航次采集的样品（年均约4-6个航次；所有航次均覆盖纽波特水文断面（Newport Hydrographic Line, NH），部分航次额外采样南部其他标准断面） |
| NH | 针对纽波特水文断面的高频近岸小型船舶采样 |
| MESO_1 | 2000年6月过程航次采集的样品 |
| MESO_2 | 2000年8月过程航次采集的样品 |

| 生活阶段信息代码（节选） | 说明 |
| ---- | ---- |
| 多数代码含义直观易懂：雄性（Male）、雌性（Female）、CV=桡足幼体第5期（Copepodite 5）、状幼体（Zoea）、无节幼体（Nauplii）、N2=无节幼体第2期（Nauplius 2）、卵（Egg）；但部分代码，尤其是针对磷虾属（Thysanoessa与Euphausia）的代码，含义略有特殊 | |
| F2 | 第二期幼糠虾期（又称幼糠虾2期） |
| F3 | 第三期幼糠虾期（又称幼糠虾3期） |
| F1_0 | 第一期幼糠虾期（附肢0对） |
| F2_32 或 Furcilia_2_3L2S | 第二期幼糠虾期，共具3对附肢，其中2对附肢具刚毛；此类xLyS命名模式较为常见，x与y的取值随发育阶段不同而变化 |

（参考Hooff与Peterson，2006）