scholarly journals Use of static passive acoustic monitoring to assess the status of the ‘Critically Endangered’ Baltic harbour porpoise in German waters

2012 ◽  
Vol 18 (3) ◽  
pp. 265-278 ◽  
Author(s):  
A Gallus ◽  
M Dähne ◽  
UK Verfuß ◽  
S Bräger ◽  
S Adler ◽  
...  
Keyword(s):  
Acoustic Monitoring ◽  
Harbour Porpoise ◽  
Critically Endangered ◽  
Passive Acoustic Monitoring ◽  
The Status ◽  
German Waters ◽  
Passive Acoustic

scholarly journals Estimating the abundance of the critically endangered Baltic Proper harbour porpoise (Phocoena phocoena) population using passive acoustic monitoring

2021 ◽  
Author(s):  
Mats Amundin ◽  
Julia Carlström ◽  
Len Thomas ◽  
Ida Carlén ◽  
Jens Koblitz ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Acoustic Monitoring ◽  
Harbour Porpoise ◽  
Critically Endangered ◽  
Phocoena Phocoena ◽  
Passive Acoustic Monitoring ◽  
Animal Populations ◽  
Baltic Proper ◽  
The Baltic ◽  
Passive Acoustic

Knowing the abundance of a population is a crucial component to assess its conservation status and develop effective conservation plans. For most cetaceans, abundance estimation is difficult given their cryptic and mobile nature, especially when the population is small and has a transnational distribution. In the Baltic Sea, the number of harbour porpoises (Phocoena phocoena) has collapsed since the mid-20th century and the Baltic Proper harbour porpoise is listed as Critically Endangered by the IUCN; however, its abundance remains unknown. Here, one of the largest ever passive acoustic monitoring studies was carried out by eight Baltic Sea nations to estimate the abundance of the Baltic Proper harbour porpoise for the first time. By logging porpoise echolocation signals at 298 stations during May 2011-April 2013, calibrating the loggers’ spatial detection performance at sea, and measuring the click rate of tagged individuals, we estimated an abundance of 66-1,143 individuals (95% CI, point estimate 490) during May-October within the population’s proposed management border. The small abundance estimate strongly supports that the Baltic Proper harbour porpoise is facing an extremely high risk of extinction, and highlights the need for immediate and efficient conservation actions through international cooperation. It also provides a starting point in monitoring the trend of the population abundance to evaluate the effectiveness of management measures and determine its interactions with the larger neighbouring Belt Sea population. Further, we offer evidence that design-based passive acoustic monitoring can generate reliable estimates of the abundance of rare and cryptic animal populations across large spatial scales.

Geographical and seasonal variation of harbour porpoise (Phocoena phocoena) presence in the German Baltic Sea revealed by passive acoustic monitoring

2007 ◽  
Vol 87 (1) ◽  
pp. 165-176 ◽  
Author(s):  
Ursula K. Verfuß ◽  
Christopher G. Honnef ◽  
Anja Meding ◽  
Michael Dähne ◽  
Roger Mundry ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Baltic Sea ◽  
Research Effort ◽  
Natura 2000 ◽  
Acoustic Monitoring ◽  
Harbour Porpoise ◽  
Passive Acoustic Monitoring ◽  
Cetacean Species ◽  
Passive Acoustic ◽  
The Impact

The harbour porpoise is the only resident cetacean species in the German Baltic Sea. Within the last several decades this harbour porpoise stock declined drastically, causing deep concern about its status. Plans of the German government for proposing Marine Protected Areas (MPAs) to implement Natura 2000 and for assessing the impact of offshore windmill constructions on the marine environment led to an increased research effort on the harbour porpoise in German waters. For the first time, long-term passive acoustic monitoring has been conducted in the German Baltic Sea from the Kiel Bight to the Pomeranian Bay from August 2002 to December 2005. Porpoise detectors (T-PODs) have been installed five to seven metres below the water surface at up to 42 measuring positions throughout the investigated area, registering the exact times of echolocation signals of passing harbour porpoises. The proportion of monitored days with porpoise detection in each quarter of the years has been analysed. A correlation of the results with the longitude of the measuring position revealed a significant decrease from west to east in the percentage of days with porpoise detections. Comparison of data gathered in the first quarters with the third quarters of the monitoring years displayed a seasonal variation with fewer days of porpoise detections in winter time than in summer time. Nevertheless, harbour porpoises have been detected year-round at most of the measuring positions in the German Baltic Sea. The present study clearly indicates a regular use of the German Baltic Sea by harbour porpoises with a geographical and seasonal variation in the usage of the German Baltic Sea. The larger numbers of harbour porpoise detections in spring to autumn compared with winter suggests that the German Baltic Sea is an important breeding and mating area for these animals.

scholarly journals Passive acoustic monitoring of the decline of Mexico's critically endangered vaquita

2016 ◽  
Vol 31 (1) ◽  
pp. 183-191 ◽  
Author(s):  
Armando Jaramillo-Legorreta ◽  
Gustavo Cardenas-Hinojosa ◽  
Edwyna Nieto-Garcia ◽  
Lorenzo Rojas-Bracho ◽  
Jay Ver Hoef ◽  
...  
Keyword(s):  
Acoustic Monitoring ◽  
Critically Endangered ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic

scholarly journals Passive Acoustic Monitoring Reveals Spatio-Temporal Distributions of Antarctic and Pygmy Blue Whales Around Central New Zealand

2021 ◽  
Vol 7 ◽  
Author(s):  
Victoria E. Warren ◽  
Ana Širović ◽  
Craig McPherson ◽  
Kimberly T. Goetz ◽  
Craig A. Radford ◽  
...  
Keyword(s):  
New Zealand ◽  
Acoustic Monitoring ◽  
Critically Endangered ◽  
Blue Whale ◽  
Passive Acoustic Monitoring ◽  
Animal Populations ◽  
Spatio Temporal ◽  
Species Specific ◽  
Passive Acoustic ◽  
Blue Whales

Effective management of wild animal populations relies on an understanding of their spatio-temporal distributions. Passive acoustic monitoring (PAM) is a non-invasive method to investigate the distribution of free-ranging species that reliably produce sound. Critically endangered Antarctic blue whales (Balaenoptera musculus intermedia) (ABWs) co-occur with pygmy blue whales (B. m. brevicauda) (PBWs) around New Zealand. Nationally, both are listed as “data deficient” due to difficulties in access and visual sub-species identification. PAM was used to investigate the distributions of blue whales via sub-species specific song detections in central New Zealand. Propagation models, incorporating ambient noise data, enabled the comparison of detections among recording locations in different marine environments. ABW detections peaked during austral winter and spring, indicating that New Zealand, and the South Taranaki Bight (STB) in particular, is a migratory corridor for ABWs. Some ABW calls were also detected during the breeding season (September and October). PBW calls were highly concentrated in the STB, particularly between March and May, suggesting that an aggregation of PBWs may occur here. Therefore, the STB is of great importance for both sub-species of blue whale. PBW detections were absent from the STB during parts of austral spring, but PBWs were detected at east coast locations during this time. Detection area models were valuable when interpreting and comparing detections among recording locations. The results provide sub-species specific information required for management of critically endangered ABWs and highlight the relative importance of central New Zealand for both sub-species of blue whale.

Sound production of the critically endangered totoaba (Totoaba macdonaldi): Laying the foundation for conservation of this species through passive acoustic monitoring

2019 ◽  
Vol 146 (4) ◽  
pp. 2855-2855
Author(s):  
Goldie Phillips ◽  
Gerald L. D'Spain ◽  
Catalina López-Sagástegui ◽  
Daniel Guevara ◽  
Miguel Angel Cisneros-Mata ◽  
...  
Keyword(s):  
Sound Production ◽  
Acoustic Monitoring ◽  
Critically Endangered ◽  
Passive Acoustic Monitoring ◽  
Totoaba Macdonaldi ◽  
Passive Acoustic

scholarly journals Last call: Passive acoustic monitoring shows continued rapid decline of critically endangered vaquita

2017 ◽  
Vol 142 (5) ◽  
pp. EL512-EL517 ◽  
Author(s):  
Len Thomas ◽  
Armando Jaramillo-Legorreta ◽  
Gustavo Cardenas-Hinojosa ◽  
Edwyna Nieto-Garcia ◽  
Lorenzo Rojas-Bracho ◽  
...  
Keyword(s):  
Acoustic Monitoring ◽  
Critically Endangered ◽  
Rapid Decline ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic
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