[MARMAM] New paper: Tying up loose ends together: Cetaceans, maritime traffic and spatial management tools in the Strait of Gibraltar.

Alessia Scuderi alessia.scuderi1 at gmail.com
Thu Jan 18 00:24:17 PST 2024

Dear MARMAM community,

My co-authors and I are pleased to share our last work with the community:

Scuderi A., Campana I., Gregorietti M., Martín Moreno E., García Sanabria
J., and Arcangeli A. 2024. Tying up loose ends together: Cetaceans,
maritime traffic and spatial management tools in the Strait of Gibraltar.
Aquatic Conservation: Marine and Freshwater Ecosystems.

You can find it by clicking on the following link:



   1. The transboundary area of the Strait of Gibraltar is home to seven
   protected cetacean species that are threatened by high intensity of
   maritime traffic. More comprehensive knowledge of cetaceans and maritime
   traffic is required, together with analyses of legislations, strategies and
   2. This study quantitatively investigates cetacean distribution and
   maritime traffic intensity and, for the species of community interest
   bottlenose dolphin, habitat suitability. Results are qualitatively
   discussed considering the overlap of cetacean hot spots with different
   maritime activities and the consistency of spatial conservation management
   measures in force.
   3. The Fixed Line Transect Mediterranean Monitoring Network protocols
   were followed for 59 visual surveys using ferries as observation platforms
   for monitoring cetaceans and maritime traffic. Surveys were carried out
   along the transects between Algeciras and Ceuta and between Algeciras and
   Tanger-Med, in 2018 and 2019. 264 cetacean sightings, including seven
   different species and four near-miss collision events (involving pilot,
   sperm and fin whales), were reported.
   4. Monitoring cetaceans from ferries in the Strait provided insights
   into cetacean distribution and maritime traffic, enabling the
   identification of cetacean hot spots, suitable habitats and maritime
   traffic high-risk zones.
   5. A transboundary management effort is required, together with an
   adaptive approach for protecting highly mobile species such as cetaceans.
   Proposals include a long-term cetacean monitoring program carried out by
   dedicated observers on board ferries as a cost-effective methodology and
   mandatory training for crew members, to increase cetacean knowledge and
   reduce collision risk.
   6. The designation of an international temporal or, in some zones,
   permanent speed reduction area (i.e., Cetacean Critical Navigation Zone,
   with a maximum speed of 13 knots) and of a micro-sanctuary with a seasonal
   no-take zone in the Bay between Algeciras and Gibraltar, together with
   international surveillance, are recommended measures for the enhancement of
   conservation efforts in the Strait.

If you would like a copy or further information, please do not hesitate to
contact me.

Best regards,

Alessia Scuderi

El mié, 17 ene 2024 a las 21:14, <marmam-request at lists.uvic.ca> escribió:

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> Today's Topics:
>    1. New paper on mysid shrimp as a prey item for gray whales in
>       Washington, USA (Liz Allyn)
>    2. Reminder DCLDE2024 abstract submission
>       (Benda-Beckmann, A.M. (Sander) von)
> ----------------------------------------------------------------------
> Message: 1
> Date: Tue, 16 Jan 2024 11:15:54 -0800
> From: Liz Allyn <liz.allyn at makah.com>
> To: marmam at lists.uvic.ca
> Subject: [MARMAM] New paper on mysid shrimp as a prey item for gray
>         whales in Washington, USA
> Message-ID:
>         <CAG2Xfmt849EP8y814Ye9=
> TXi+QQFh38WgVV1YCAqn47Ra7JHwg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> Dear MARMAMers,
> My co-authors and I are pleased to announce the publication of a new
> article titled "Distribution and demographics of mysids (Crustacean:
> Mysida) as prey for gray whales (Eschrichtius robustus) in northwest
> Washington state."
> Allyn EM, Scordino JJ, Akmajian AM. 2024. Distribution and demographics of
> mysids (Crustacea: Mysida) as prey for gray whales (*Eschrichtius
> robustus*)
> in northwest Washington state. PeerJ 12:e16587
> https://doi.org/10.7717/peerj.16587
> Abstract:
> The movement and distribution of gray whales (*Eschrichtius robustus*)
> during the feeding season is likely dependent on the quality of foraging
> opportunities and the distribution of prey species. These dynamics are
> especially important to understand for the Pacific Coast Feeding Group
> (PCFG) of gray whales which spend the feeding season along the coast from
> northern California, USA through northern British Columbia, Canada. In
> Washington state, no previous work has been done to describe available gray
> whale prey. The main goal of this research was to initiate studies on an
> important gray whale prey item in northwest Washington, mysid shrimp
> (Mysida), by establishing a baseline understanding of mysid swarm
> demographics in the area and investigating patterns in gray whale and mysid
> presence. Prey samples were collected during June through November 2019 and
> June through September 2020 using a vertically-towed plankton net at seven
> sites in the Strait of Juan de Fuca and seven sites in the Pacific Ocean in
> areas where gray whales were known to feed. Mysids collected in the samples
> were counted and the sex, length, species, maturity, and gravidity were
> documented. Patterns in gray whale and mysid co-occurrence were explored
> through data visualization. Seven species of mysids were observed in the
> survey area. In 2019, the number of mysids per tow increased steadily
> through the season, the most abundant species of mysids were *Holmesimysis
> sculpta* and *Neomysis rayii*, and sampled mysids averaged 4.7 mm in
> length. In 2020, mysids were abundant in tow samples in June and July but
> were not abundant in the remaining months of the sampling season. The
> average length of mysids in 2020 was 13.3 mm, and a large portion were
> sexually mature males and brooded females identified as *H. sculpta*.
> Throughout the survey area, the majority of whale sightings occurred later
> in the season in 2019 and earlier in the season in 2020, coinciding with
> the trends of sampled mysids. This study provides the first description of
> mysid swarm composition and temporal variation in northwest Washington.
> Tows were dominated by a similar assemblage of mysid species as what is
> observed in other areas of the PCFG range. The differences in sampled mysid
> assemblages between years, and the presence of whales in the survey area in
> times and at sites where samples with high mysid counts were collected,
> suggest evidence for interesting predator-prey dynamics that warrant
> further investigation.
> The article is open access and can be found at the link: Distribution and
> demographics of mysids (Crustacea: Mysida) as prey for gray whales
> (Eschrichtius robustus) in northwest Washington state [PeerJ]
> <https://peerj.com/articles/16587/>
> --
> Liz Allyn (She/Her)
> Marine Mammal Technician II
> Makah Fisheries Management
> &
> Graduate Student
> Marine Conservation and Ecology Group <https://sites.uw.edu/essing/>
> School of Aquatic and Fishery Sciences
> University of Washington
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> ------------------------------
> Message: 2
> Date: Mon, 15 Jan 2024 10:10:59 +0000
> From: "Benda-Beckmann, A.M. (Sander) von"
>         <sander.vonbendabeckmann at tno.nl>
> To: "marmam at lists.uvic.ca" <marmam at lists.uvic.ca>
> Subject: [MARMAM] Reminder DCLDE2024 abstract submission
> Message-ID: <ae89c2b24ae24f91869e0d3854a45c77 at tno.nl>
> Content-Type: text/plain; charset="us-ascii"
> Dear MARMAM readers,
> Here a quick reminder that the deadline for Abstract submission for the
> DCLE2024 workshop is approaching! It's set at January 29th, 2024. Abstracts
> can be submitted under DCLDE 2024 - Abstracts<
> https://www.dclde2024.com/abstracts/>. The website will open up for
> registration at the 1st of February. The DCLDE2024 workshop will be held in
> Rotterdam the Netherlands, on 3 - 7 June 2024.
> This workshop on Detection, Classification, Localisation and Density
> Estimation (DCLDE) of marine mammals is held on a bi-annual basis. During
> this workshop participants share their recent insights into algorithms and
> technology for acoustic monitoring of marine mammals. The workshop will be
> focused on studies using dedicated workshop datasets. In addition, we also
> expect to have some sessions more broadly related to DCLDE techniques. The
> DCLDE2024 workshop will be held in Rotterdam the Netherlands, on 3 - 7 June
> 2024.
> On the Monday before the main event we also have several interesting
> workshops/tutorials offered. For more info and how to participate, please
> visit our website<https://www.dclde2024.com/tutorials-workshops/>.
> Workshop/Tutorial
> Length
> Introduction to the Dive Depth Detection (3D) method: leveraging surface
> reflections to estimate whale depth and improve density estimation, an
> example using deep diving echolocators
> Half day
> Updates for using the Low-Frequency Detection and Classification System
> (LFDCS) with archival and near real-time acoustic datasets
> Full day
> The DE part: marine mammal density estimation from passive acoustic
> monitoring data
> Full day (half possible)
> PAMGuard: New features and any other questions
> Full day
> Array Beamforming for Passive Acoustic Monitoring
> Half day
> We look forward to see you all in Rotterdam in June!
> On behalf of the DCLDE2024 organizing committee,
> Sander von Benda-Beckmann,
> Senior Scientist
> TNO, Acoustic Sensor and Sonar Systems, The Netherlands
> This message may contain information that is not intended for you. If you
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> End of MARMAM Digest, Vol 222, Issue 14
> ***************************************

Alessia Scuderi, PhD
Marine Biologist

Phone: +34 692 606 564
Skype: alessia.scuderi82
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