Variation in isotopic trophic niche of sablefish (Anoplopoma fimbria) and shortraker rockfish (Sebastes borealis) in the Northeast Pacific

Sablefish (Anoplopoma fimbria, Anoplopomatidae) and shortraker rockfish (Sebastes borealis, Sebastidae), co-occur in deepwater marine habitats in the northeast Pacific. Both species are economically valuable, but their ecologies are not well known. We used stable isotope analysis of carbon and nitrogen to explore isotopic niches of A. fimbria and S. borealis in two distinct locations – a deep strait in the inside passage area and an open coastal area of the continental shelf, both in southeast Alaska, USA. Anoplopoma fimbria and S. borealis exhibited similar positions of isotopic niches based on nitrogen and carbon isotopic ratios suggesting potential interspecific competition, especially in the inside location. In addition, S. borealis had a smaller niche breadth compared to A. fimbria in the coastal location. Both species had enriched nitrogen and carbon isotopic ratios in the inside location compared to the coastal location. Differences in isotopic niches between these two locations ..., Sampling Areas
We obtained samples of A. fimbria and S. borealis in two distinct locations in southeast Alaska (Figure 1) from June to August 2021. Both locations exhibited an average annual air temperature of 4.83 °C and water depth and thus sampling depth was 600 to 700 meters at both locations. The first sampling area was out on the open ocean near the western outlet of Icy Strait which will be referred to as the coastal location. The second area was in Lynn Canal, a narrow, deep strait located just north of the eastern extent of Icy Strait. This location will be referred to as the inside location (Figure 1). Although located at the same latitude and within 100 km of each other, these two locations represent the most extreme differences in habitat where both species occur as adults.
Samples of both species (62 A. fimbria and 26 S. borealis) were obtained from recreational fishermen in the inside location and commercial catches in the coastal location (Figure 1). All fish were caught ..., , # Variation in isotopic trophic niche of sablefish (*Anoplopoma fimbria*) and shortraker rockfish (*Sebastes borealis*) in the Northeast Pacific

[https://doi.org/10.5061/dryad.mw6m90651](https://doi.org/10.5061/dryad.mw6m90651)

## Description of the data and file structure

### Files and variables

#### File: Sablefish\_and\_Shortraker\_Alaska\_Data\_updated\_for\_Dryad\_aug\_2024.xlsx

**Description:** excel sheet containing all data used for the paper

##### Variables

| Sample ID | Date | Species | Location | Total Length (mm) | d15N vs. At. Air (‰) | d13C vs. VPDB (‰) | d13C Corrected |
| :----------------------------------- | :----------...

裸盖鱼（Anoplopoma fimbria,裸盖鱼科Anoplopomatidae）与短吻平鲉（Sebastes borealis,平鲉科Sebastidae）共同栖息于东北太平洋的深水海洋环境中。两种鱼类均具有经济价值，但其生态学特征尚不明确。本研究采用碳、氮稳定同位素分析方法，探究了美国阿拉斯加东南部两个不同区域——内航道区域的深水海峡及大陆架的开阔海岸区域——中A. fimbria与S. borealis的同位素生态位。

基于氮、碳同位素比值，裸盖鱼与短吻平鲉的同位素生态位位置相似，这表明两者可能存在种间竞争，尤其在内航道区域更为显著。此外，在海岸区域，短吻平鲉的生态位宽度小于裸盖鱼。与海岸区域相比，两个物种在内航道区域的氮、碳同位素比值均更富集。

## 采样区域
2021年6月至8月期间，我们在美国阿拉斯加东南部的两个不同区域（图1）采集了裸盖鱼与短吻平鲉样本。两个区域的年平均气温均为4.83℃，水深（即采样深度）均为600至700米。第一个采样区域位于冰海峡西口附近的开阔海域，称为海岸区域；第二个区域位于林恩运河（冰海峡东端以北的狭窄深水海峡），称为内航道区域（图1）。尽管两个区域纬度相同且相距不足100公里，但它们代表了两种鱼类成体栖息环境中差异最显著的栖息地类型。

两种鱼类的样本（内航道区域62尾裸盖鱼、26尾短吻平鲉）来自休闲渔民捕获物（内航道区域）及商业渔获物（海岸区域）（图1）。所有鱼类均通过...

# 东北太平洋裸盖鱼（*Anoplopoma fimbria*）与短吻平鲉（*Sebastes borealis*）的同位素营养生态位变异

[https://doi.org/10.5061/dryad.mw6m90651](https://doi.org/10.5061/dryad.mw6m90651)

## 数据与文件结构描述

### 文件与变量

#### 文件：Sablefish_and_Shortraker_Alaska_Data_updated_for_Dryad_aug_2024.xlsx

**描述：** 包含本研究所有数据的Excel表格

##### 变量

| 样本ID | 日期 | 物种 | 区域 | 总长度（mm） | δ¹⁵N相对大气氮（Atmospheric Air）（‰） | δ¹³C相对VPDB（维也纳皮迪组石炭纪地层标准，Vienna Peedee Belemnite）（‰） | 校正后δ¹³C |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| ...