Minto Inlet 2019 Passive Acoustic Monitoring Data

We collected seven months of passive acoustic data from February to September 2019 in Minto Inlet, Northwest Territories, Canada, using an acoustic recorder (SoundTrap ST500) attached to a bottom-mounted oceanographic mooring. The acoustic recorder recorded five minutes of audio every hour. We processed the acoustic data to examine the seasonal presence of four species of marine mammals and unidentified fish species, examine drivers of underwater sound levels, and quantify underwater noise from vessel traffic. This dataset includes hourly sound pressure levels (dB re 1 uPa) in the 20-1000 Hz, 1-10 kHz, and 10-24 kHz bands, and daily bioacoustics results, including the daily presence and daily proportion of files examined with bowhead whale (Balaena mysticetus), beluga whale (Delphinapterus leucas), ringed seal (Pusa hispida), bearded seal (Erignathus barbatus), and fish (likely Arctic cod, Boreogadus saida) vocalizations. Bearded seals were vocally present from mid-March to early July. Ringed seals were present in every month. Beluga whales were present from early July until September. Bowhead whales were detected from April to August, and fish were detected from February to July. Underwater sound levels were highest during the open water period (July - September) and lower during the ice covered period (February - June). The only vessel detected was the research vessel that recovered the acoustic recorder, therefore levels of anthropogenic noise were quite low. Underwater sound levels were much lower in Minto Inlet compared to other areas in the region, and it appears to be an important site for many marine mammals where forage fish species, primarily Arctic cod, are abundant at depth. These results are in line with Minto Inlet being identified as an important area by the community of Ulukhaktok. This area appears to be currently facing very low anthropogenic impacts, but further monitoring is required to determine if any management measures are necessary to maintain the low levels of anthropogenic pressure.

本数据集基于2019年2月至9月共7个月的被动声学监测数据，采集区域为加拿大西北地区明顿湾（Minto Inlet），采用搭载于海底海洋观测锚系上的声学记录仪（SoundTrap ST500）完成数据采集。该声学记录仪每小时录制5分钟音频片段。后续对声学数据开展处理分析，以探究4种海洋哺乳动物与未鉴定鱼类的季节分布特征、水下声级的影响因素，并量化船舶交通带来的水下噪声水平。本数据集包含20-1000 Hz、1-10 kHz及10-24 kHz三个频带下的逐小时声压级数据（以1微帕为参考的分贝值，dB re 1 uPa），以及每日生物声学分析结果，其中涵盖弓头鲸（Balaena mysticetus）、白鲸（Delphinapterus leucas）、环斑海豹（Pusa hispida）、髯海豹（Erignathus barbatus）以及鱼类（推测为北极鳕，Boreogadus saida）鸣唱的每日检出情况与检出文件占比。髯海豹的鸣声检出时段为3月中旬至7月初；环斑海豹在所有监测月份均有检出；白鲸的检出时段为7月初至9月；弓头鲸的检出时段为4月至8月，鱼类的检出时段为2月至7月。水下声级在无冰期（7月至9月）达到峰值，而在冰覆盖期（2月至6月）处于较低水平。本次监测仅检出回收声学记录仪所用的科研船舶，因此人为噪声水平整体偏低。明顿湾的水下声级显著低于该区域其他点位，且作为多种海洋哺乳动物的重要栖息生境，其深部水域的饵料鱼类（以北极鳕为主）资源丰富。上述结果与乌卢赫克托克（Ulukhaktok）社区将明顿湾认定为重要区域的结论一致。该区域目前受人为活动影响程度极低，但仍需开展后续监测，以评估是否需要制定管理措施以维持当前较低的人为压力水平。

搜集汇总

背景与挑战

背景概述

该数据集为2019年2月至9月在加拿大Minto Inlet采集的被动声学监测数据，使用声学记录仪记录音频，包含小时级声压水平和日级生物声学结果，用于分析弓头鲸、白鲸等海洋哺乳动物和鱼类的季节性存在，以及水下声级变化。数据显示该区域人为噪音较低，是海洋哺乳动物的重要栖息地，但需进一步监测以评估管理需求。