International workshop: Cetacean echolocation and outer space neutrinos: ethology and physics for an interdisciplinary approach to underwater bioacoustics and astrophysical particles detection

A workshop is held at Sicily, Italy in this October. There were lots of communications on marine observatories and their application of using passive acoustic monitoring on particle physics and marine ecology.

We also presented a short talk in this workshop:

Detecting the structural variability of cetacean tonal sounds by automatic detection and classification algorithms

In recent years, long-term acoustic recorders have been extensively employed to examine the temporal variation of cetacean occurrences. However, the interpretation of cetacean behavior based on their vocal usage remains difficult. The temporal variation of behaviors can only be detected through the variability of vocal usage. Tonal sounds are believed to play an important role in cetacean communication and the changes in repertoire complexity can be indicative of behavioral changes. Burst-pulses are frequently detected in the terminal phase of feeding event, thus can be seen as the indication of foraging behavior. In this study, automatic detection and classification algorithms were applied to examine the usage pattern of tonal sounds, in terms of frequency modulation and structural complexity. A bandwidth detector was employed on long-term recordings from the marine cable hosted observatory (MACHO) off Northeastern Taiwan to collect cetacean tonal sounds and burst-pulses. The instantaneous frequency bandwidth of tonal sound was applied as a detection parameter so that it can effectively extract the representative frequencies of tonal sound. The representative frequencies of burst pulse, fundamental frequency, and harmonic were separated and used to analyze the temporal variation of tonal sound frequency modulation. Individual contours were then tracked from the representative frequencies of fundamental frequency. Different types of contour were classified through an unsupervised method to examine the repertoire composition without subjective determination. The structural complexity of tonal sound repertoire was quantified using the information theory. Through the current framework, the variability of tonal sound usage among the diel cycle and seasonal cycle can be analyzed. It also provides intuitive parameters for the structural variability of tonal sound usage, which can facilitate the species recognition and the examination of cetacean habitat use.

 

For people who want more information, you can check the proceedings and slide materials on the workshop website.

https://agenda.infn.it/conferenceTimeTable.py?confId=5931#all.detailed

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離岸風場開發噪音對沿岸鯨豚類動物之衝擊

離岸風場開發噪音對沿岸鯨豚類動物之衝擊

林子皓1、林思瑩1、余欣怡1、周蓮香1*

1國立台灣大學生態學與演化生物學研究所

摘要

台灣西岸的風能豐沛,離岸風力發電將為重要的再生能源產業。然而台灣目前預定的風場位置大多與中華白海豚活動範圍重疊或比鄰。中華白海豚在台灣西部沿海的族群極度瀕危,少於100隻個體,因此亟須審慎評估離岸風場開發對中華白海豚之生態影響,尤其是所產生的水下噪音的潛在衝擊。離岸風場開發過程中,以打樁工程、船隻交通所產生之人為噪音衝擊層面最廣,運轉的噪音影響較小,可能造成的生態影響尚不明。高強度的噪音可能會對鯨豚造成的影響包括:聽力損傷,行為反應、棲地位移、遮蓋效應,或增加鯨豚長期的生理壓力。目前尚未見離岸風場開發影響中華白海豚生態之研究發表,本文彙整國際上離岸風場對沿岸鯨豚類之短期與長期生態影響資訊,並根據目前了解之噪音衝擊面向,研擬三大方向的減輕措施:預防性措施、減輕衝擊措施以及施工管制措施。利用以上資訊依循預警原則的觀念進行開發計畫,減低對於中華白海豚的影響。

全文請至下面連結下載觀看。

offshore windfarm impact_CH