Bottlenose dolphins in the Netherlands come from two sides: across the North Sea and through the English Channel

Jeroen P. A. Hoekendijk; Mardik F. Leopold; Barbara J. Cheney

doi:10.1017/S0025315421000679

Bottlenose dolphins in the Netherlands come from two sides: across the North Sea and through the English Channel

Jeroen P. A. Hoekendijk, Mardik F. Leopold, Barbara J. Cheney

Aberdeen Centre For Environmental Sustainability

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

4 Downloads (Pure)

Abstract

On 19 July 2019 an estimated 20 bottlenose dolphins (Tursiops truncatus) were observed in the Marsdiep, a tidal inlet connecting the North Sea and the Dutch Wadden Sea, between Den Helder and the island of Texel. Photographs and video recordings were made and nine individuals were matched with known dolphins from the Moray Firth, NE Scotland. These are the first matches of this east coast of Scotland population outside the UK and Ireland. Subsequent observations of individuals from this group show that at least some of the animals have returned to Scottish waters, while others were photographed in Danish waters. Furthermore, we report on a photo identification match of a solitary bottlenose dolphin between France and the Netherlands. These matches suggest that bottlenose dolphins, in the Netherlands, originate from two different genetically distinct populations: ‘Coastal South’ and ‘Coastal North’. This evidence of previously unknown long-range movements may have important implications for the conservation and management of this species in European waters.

Original language	English
Article number	0025315421000679
Pages (from-to)	853-859
Number of pages	7
Journal	Journal of the Marine Biological Association of the United Kingdom
Volume	101
Issue number	5
Early online date	7 Oct 2021
DOIs	https://doi.org/10.1017/S0025315421000679
Publication status	Published - 2021

Bibliographical note

Acknowledgements. Many thanks to Jasper Rautenberg, Bert de Haan, Nick
van der Ham and Nils van Duivendijk for sharing the initial 2019 sightings
through Observation.org, to Steve Truluck (WDC), Charlie Philips (WDC),
Wouter Jan Strietman and SOS Dolfijn for rapidly sharing this information, to
Tobias Brügging and Het Sop for providing additional images of these sightings,
to Rogier Kruger, Bram Fey and Sophie Brasseur for providing additional images
of the 2004 sightings, to Guido Keijl (Walvisstrandingen.nl) for his help summarizing the recent strandings, to Lonneke IJsseldijk for providing additional information on the necropsies, to Hans Verdaat (Observation.org), to Geert Aarts for the map of North Holland and to Pauline Gauffier for her help with matching
‘Zafar’. Finally, we thank the editor and two anonymous reviewers for their
many constructive and insightful comments and suggestions.
Financial support. This research received no specific grant from any funding agency, commercial or not-for-profit sectors. JH was funded by NWO
(project ALWPP.2017.003).

Keywords

Bottlenose dolphin
cetaceans
long-range movement
Moray Firth
North Sea
photo identification
the Netherlands

Access to Document

10.1017/S0025315421000679Licence: Unspecified

Hoekendijk_etal_JMBAUK_Bottlenose_Dolphins_In_AAM
This article has been published in a revised form in Journal of the Marine Biological Association of the UK: https://dx.doi.org/10.1017/S0025315421000679. This version is free to view and download for private research and study only. Not for re-distribution or re-use. © The Author(s), 2021. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom
Accepted author manuscript, 1.08 MBLicence: Unspecified

Cite this

Bottlenose dolphins in the Netherlands come from two sides: across the North Sea and through the English Channel. / Hoekendijk, Jeroen P. A.; Leopold, Mardik F.; Cheney, Barbara J.
In: Journal of the Marine Biological Association of the United Kingdom, Vol. 101, No. 5, 0025315421000679, 2021, p. 853-859.

Research output: Contribution to journal › Article › peer-review

@article{b094bc664085477a9b152f26b656770f,

title = "Bottlenose dolphins in the Netherlands come from two sides: across the North Sea and through the English Channel",

abstract = "On 19 July 2019 an estimated 20 bottlenose dolphins (Tursiops truncatus) were observed in the Marsdiep, a tidal inlet connecting the North Sea and the Dutch Wadden Sea, between Den Helder and the island of Texel. Photographs and video recordings were made and nine individuals were matched with known dolphins from the Moray Firth, NE Scotland. These are the first matches of this east coast of Scotland population outside the UK and Ireland. Subsequent observations of individuals from this group show that at least some of the animals have returned to Scottish waters, while others were photographed in Danish waters. Furthermore, we report on a photo identification match of a solitary bottlenose dolphin between France and the Netherlands. These matches suggest that bottlenose dolphins, in the Netherlands, originate from two different genetically distinct populations: {\textquoteleft}Coastal South{\textquoteright} and {\textquoteleft}Coastal North{\textquoteright}. This evidence of previously unknown long-range movements may have important implications for the conservation and management of this species in European waters.",

keywords = "Bottlenose dolphin, cetaceans, long-range movement, Moray Firth, North Sea, photo identification, the Netherlands",

author = "Hoekendijk, {Jeroen P. A.} and Leopold, {Mardik F.} and Cheney, {Barbara J.}",

note = "Acknowledgements. Many thanks to Jasper Rautenberg, Bert de Haan, Nick van der Ham and Nils van Duivendijk for sharing the initial 2019 sightings through Observation.org, to Steve Truluck (WDC), Charlie Philips (WDC), Wouter Jan Strietman and SOS Dolfijn for rapidly sharing this information, to Tobias Br{\"u}gging and Het Sop for providing additional images of these sightings, to Rogier Kruger, Bram Fey and Sophie Brasseur for providing additional images of the 2004 sightings, to Guido Keijl (Walvisstrandingen.nl) for his help summarizing the recent strandings, to Lonneke IJsseldijk for providing additional information on the necropsies, to Hans Verdaat (Observation.org), to Geert Aarts for the map of North Holland and to Pauline Gauffier for her help with matching {\textquoteleft}Zafar{\textquoteright}. Finally, we thank the editor and two anonymous reviewers for their many constructive and insightful comments and suggestions. Financial support. This research received no specific grant from any funding agency, commercial or not-for-profit sectors. JH was funded by NWO (project ALWPP.2017.003).",

year = "2021",

doi = "10.1017/S0025315421000679",

language = "English",

volume = "101",

pages = "853--859",

journal = "Journal of the Marine Biological Association of the United Kingdom",

issn = "0025-3154",

publisher = "Cambridge University Press",

number = "5",

}

TY - JOUR

T1 - Bottlenose dolphins in the Netherlands come from two sides

T2 - across the North Sea and through the English Channel

AU - Hoekendijk, Jeroen P. A.

AU - Leopold, Mardik F.

AU - Cheney, Barbara J.

N1 - Acknowledgements. Many thanks to Jasper Rautenberg, Bert de Haan, Nick van der Ham and Nils van Duivendijk for sharing the initial 2019 sightings through Observation.org, to Steve Truluck (WDC), Charlie Philips (WDC), Wouter Jan Strietman and SOS Dolfijn for rapidly sharing this information, to Tobias Brügging and Het Sop for providing additional images of these sightings, to Rogier Kruger, Bram Fey and Sophie Brasseur for providing additional images of the 2004 sightings, to Guido Keijl (Walvisstrandingen.nl) for his help summarizing the recent strandings, to Lonneke IJsseldijk for providing additional information on the necropsies, to Hans Verdaat (Observation.org), to Geert Aarts for the map of North Holland and to Pauline Gauffier for her help with matching ‘Zafar’. Finally, we thank the editor and two anonymous reviewers for their many constructive and insightful comments and suggestions. Financial support. This research received no specific grant from any funding agency, commercial or not-for-profit sectors. JH was funded by NWO (project ALWPP.2017.003).

PY - 2021

Y1 - 2021

N2 - On 19 July 2019 an estimated 20 bottlenose dolphins (Tursiops truncatus) were observed in the Marsdiep, a tidal inlet connecting the North Sea and the Dutch Wadden Sea, between Den Helder and the island of Texel. Photographs and video recordings were made and nine individuals were matched with known dolphins from the Moray Firth, NE Scotland. These are the first matches of this east coast of Scotland population outside the UK and Ireland. Subsequent observations of individuals from this group show that at least some of the animals have returned to Scottish waters, while others were photographed in Danish waters. Furthermore, we report on a photo identification match of a solitary bottlenose dolphin between France and the Netherlands. These matches suggest that bottlenose dolphins, in the Netherlands, originate from two different genetically distinct populations: ‘Coastal South’ and ‘Coastal North’. This evidence of previously unknown long-range movements may have important implications for the conservation and management of this species in European waters.

AB - On 19 July 2019 an estimated 20 bottlenose dolphins (Tursiops truncatus) were observed in the Marsdiep, a tidal inlet connecting the North Sea and the Dutch Wadden Sea, between Den Helder and the island of Texel. Photographs and video recordings were made and nine individuals were matched with known dolphins from the Moray Firth, NE Scotland. These are the first matches of this east coast of Scotland population outside the UK and Ireland. Subsequent observations of individuals from this group show that at least some of the animals have returned to Scottish waters, while others were photographed in Danish waters. Furthermore, we report on a photo identification match of a solitary bottlenose dolphin between France and the Netherlands. These matches suggest that bottlenose dolphins, in the Netherlands, originate from two different genetically distinct populations: ‘Coastal South’ and ‘Coastal North’. This evidence of previously unknown long-range movements may have important implications for the conservation and management of this species in European waters.

KW - Bottlenose dolphin

KW - cetaceans

KW - long-range movement

KW - Moray Firth

KW - North Sea

KW - photo identification

KW - the Netherlands

UR - http://www.scopus.com/inward/record.url?scp=85117088724&partnerID=8YFLogxK

U2 - 10.1017/S0025315421000679

DO - 10.1017/S0025315421000679

M3 - Article

SN - 0025-3154

VL - 101

SP - 853

EP - 859

JO - Journal of the Marine Biological Association of the United Kingdom

JF - Journal of the Marine Biological Association of the United Kingdom

IS - 5

M1 - 0025315421000679

ER -

Bottlenose dolphins in the Netherlands come from two sides: across the North Sea and through the English Channel

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

Fingerprint

Cite this