Gemini T-c: aerial surveys and passive acoustic monitoring of harbour porpoises 2015

Geelhoed, S.C.V.; I., Onderz. Form.; Friedrich, E.; Joost, M.; Machiels, M.A.M.; Stöber, N.

doi:10.18174/410635

Cited by 6 publications

(10 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further north numbers peak in May and June along the German coast (Gilles et al, 2009), between April-August in Denmark (Teilmann et al, 2008), and in August along the eastern coast of the United Kingdom (Evans et al, 2003). PAM studies in wind farms off the Dutch mainland coast (Scheidat et al, 2011;Van Polanen Petel et al, 2012), as well as in GEMINI off the Wadden Isles (Geelhoed et al, 2018b) corroborate these seasonal patterns. Further east along the Dutch-German border, on a line of CPODs from the island of Borkum into the Eems-Dollard estuary, Brasseur et al, (2010) detected the lowest click rate in April-July and a higher click rate in August-December.…”

Section: Seasonal Patternsmentioning

confidence: 83%

Feasibility of a Passive Acoustic Monitoring (PAM) network for Harbour Porpoises on the Dutch Continental Shelf

Scheidat¹,

Geelhoed²,

Noort³

2019

Self Cite

View full text Add to dashboard Cite

Section: Seasonal Patternsmentioning

confidence: 83%

Feasibility of a Passive Acoustic Monitoring (PAM) network for Harbour Porpoises on the Dutch Continental Shelf

Scheidat¹,

Geelhoed²,

Noort³

2019

Self Cite

View full text Add to dashboard Cite

“…This has been especially useful when determining the impact of human activities that can be harmful, such as the noise that is emitted when wind farms are built (Scheidat et al, 2011;Wingfield et al, 2017). Within the Netherlands, large-scale use of passive acoustic monitoring of harbour porpoises has taken place (Brinkkemper et al, 2021;Geelhoed et al, 2018;Scheidat et al, 2011). This data is collected primarily within projects related to the construction and operation of wind farms but not exclusively.…”

Section: Discussionmentioning

confidence: 99%

Distinguishing between adult and calf harbour porpoise clicks : A pilot study in the Dutch Oosterschelde

Vrooman¹,

Bergès²

2022

View full text Add to dashboard Cite

show abstract

“…wind farm) is used over time. During the construction phase of the Gemini wind farm a reduction of harbour porpoise click activity, generally interpreted as a (short-term) displacement of animals, was found (Geelhoed et al, 2018). Our results further suggest a reduction in their foraging behaviour as well.…”

Section: Discussionmentioning

confidence: 99%

“…In this chapter we describe the information relevant for the analyses conducted for this report. For a more in-depth description of the data and the method of data collection in the field we would like to refer the reader to Geelhoed et al (2018).…”

Section: Data Overviewmentioning

confidence: 99%

Quantifying harbour porpoise foraging behaviour in CPOD data: identification, automatic detection and potential application

Bergès¹,

D.²,

Geelhoed³

et al. 2019

Self Cite

View full text Add to dashboard Cite

Harbour porpoise foraging behaviour 2.3 Gemini Offshore Wind Farm 2.4 CPOD data collection 3 Method 3.1 Click train based methods 3.2 Click based methods 4 Results and discussion 4.1 Identification of foraging behaviour 4.1.1 Click train based methodology 4.1.2 Click based methodology 4.2 Methods for automated detection of foraging/feeding events 4.2.1 Methodology comparison 4.2.2 Buzz clicks detection algorithm 4.3 Application to Gemini data 4.3.1 Changes over time and between stations 4.3.2 Relation to pile driving activities 4.4 Limitations 5 Conclusions and recommendations 5.1 Conclusions 5.2 Recommendations 6 Acknowledgments 7 Quality Assurance References Annex I: additional results Justification Wageningen Marine Research report C039/19| 4 of 41 Summary Harbour porpoises (Phocoena phocoena) are regularly monitored to assess how they are impacted by the construction and operation of offshore wind farms. A suitable method to do this is passive acoustic monitoring (PAM), and in particular using specific stationary hydrophones called CPODs. These devices provide information on click activity, which can then be analysed to investigate habitat use over time, differences between areas and the impact of human activities. Due to their small size and high metabolism porpoises are thought to need a more or less constant supply of prey to survive. Prey occurrence is thus considered one of the main drivers in porpoise distribution. And successful feeding is vital to the fitness and survival of individual porpoises. Information on foraging behaviour, however, is difficult to obtain in the field, in particular as animals feed under water. Recently the tagging of animals has provided new insights into porpoise behaviour, but it has been done for a limited number of individuals and for short times only. CPOD data have been used in Dutch waters to monitor harbour porpoise habitat use and behaviour before, during and after the construction of wind farms. The analyses have focussed on using a number of parameters that can be derived from the data, such as porpoise positive minutes, hours or days, encounter and waiting times. From other studies, primarily in captivity, we know that during foraging porpoises produce a characteristic pattern of clicks, starting with an approach phase and ending with a so-called "terminal buzz". Aim of our study was to investigate if we could quantify foraging behaviour from CPOD data, and we were able to use an existing data set of harbour porpoise click activity from the Gemini wind park (June 2015 to February 2016). The study consisted of three phases. First, the different existing methods were applied to a sample set of data to determine the most suitable approach to identify foraging behaviour. The results indicate that re-classification of clicks following the method developed by Pirotta (2014 a,b) to identify terminal buzzes provides the best results. Second, an algorithm was written to allow the automated analyses of CPOD data following this method. Finally, this analytical tool was applie...

show abstract

Gemini T-c: aerial surveys and passive acoustic monitoring of harbour porpoises 2015

Cited by 6 publications

References 31 publications

Feasibility of a Passive Acoustic Monitoring (PAM) network for Harbour Porpoises on the Dutch Continental Shelf

Feasibility of a Passive Acoustic Monitoring (PAM) network for Harbour Porpoises on the Dutch Continental Shelf

Distinguishing between adult and calf harbour porpoise clicks : A pilot study in the Dutch Oosterschelde

Quantifying harbour porpoise foraging behaviour in CPOD data: identification, automatic detection and potential application

Contact Info

Product

Resources

About