Project

Effects of reefs on fish abundance and diversity -- implications for marine fisheries and conservation of harbour porpoises

Publisher

Supervisor

Location

Greater Copenhagen area

Aim:

The aim of this study is to examine to what extent cobble reefs affect abundance and diversity of fish and harbour porpoises (Phocoena phocoena) in coastal areas. The project will reveal if cobble reefs benefit marine fisheries and conservation of harbour porpoise.

Background:

Cobble is extracted in coastal areas in Denmark, but the effects of the extraction on fish abundance and diversity are unknown. While many coastal fish populations have been in decline in recent years, the possible relationship between cobble extraction and declining fish populations remains uncertain. Using underwater video footage, this project examines fish abundance and diversity on natural cobble reefs, artificial cobble reefs and on sandy sea beds. Project videos are available here and here. The project is carried out in the bay Sønderborg Bugt. Related papers are available here, here and here.

Content:

Fish abundance and diversity will be quantified using video footage available from underwater GoPro cameras positioned on the sea bed. Camera deployments involve both baited and unbaited cameras. Data collection will cover three types of areas: 1) control areas with sandy sea beds, 2) areas with natural cobble reefs, and 3) areas with artificial cobble reefs. The study design will be based on the Before-After-Control-Impact (BACI) approach. Specifically, the study will test the hypotheses that 1) reef restoration has led to an increase in fish abundance and diversity, and 2) artificial cobble reefs may facilitate Atlantic herring spawning activities. Because Atlantic herring is an important prey species for many larger species, cobble reefs are expected to support several trophic levels in the marine environment. In addition to the underwater video recording, abundance of harbour porpoise is measured in the three study areas (1-3). These data are collected using automatic listening stations that record sounds produced by harbour porpoise.  

Duration:

Video analyses of the available footage will take 1-4 months. Statistical analysis will take 1-4 months, and write-up is expected to take another 2-4 months. Baseline data (i.e. without artificial reefs established) have already been collected, and the student will have access to those data. The baseline data can be combined with data collected after the artificial reefs were established.

 

Contact:

Jon C. Svendsen: 

Email: jos@aqua.dtu.dk

Phone: 00 45 93 51 16 63

Twitter: @JonCSvendsen

 

In collaboration with

http://alsstenrev.dk/

Requirements

Interest in marine biology and data analyses

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Contact

Company / Organization

DTU Aqua

Name

Jon Christian Svendsen

Position

Seniorforsker

Mail

jos@aqua.dtu.dk

Supervisor info

Bachelor in General Engineering

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

BSc in Civil Engineering

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

BSc in Environmental Engineering

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

BSc in Quantitative biology and disease modelling

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

BSc in Software Technology

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

IT og kommunikationsteknologi

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

Miljø

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

Bachelor of Engineering

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

Bachelor of Engineering, Software Engineering

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

Bachelor of Engineering, Software Engineering

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

MSc in Aquatic Science and Technology

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

MSc in Environmental Engineering

Supervisor

Jon Christian Svendsen

Co-supervisors

Josianne Gatt Støttrup, Tim Wilms

ECTS credits

10 - 60

Type

Final project, BSc project, MSc thesis, Special course

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.


Today, DTU is ranked as one of the foremost technical universities in Europe, continues to set new records in the number of publications, and persistently increases and develops our partnerships with industry, and assignments accomplished by DTU’s public sector consultancy.

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