230
*corresponding author: iratxe.rubio@bc3research.org
Keywords: Climate change, Tropical tunas, Transboundary
stocks, Industrial fisheries, Atlantic Ocean
There is broad evidence of climate change causing shifts
in fish distribution worldwide. This evidence concentrates
mostly in the North Atlantic Ocean, lacking observations in
tropical regions. According to the Intergovernmental Panel
on Climate Change, the strongest ocean warming will be in
tropical and Northern Hemisphere subtropical regions.
Therefore, we see a necessity of investigating impacts of climate change in tropical areas. Moreover, even if research has
documented shifts in fish distribution due to warming climates, less is known about the response of fisheries to these
shifts. For that purpose, fleets fishing tropical tunas have
been selected as a case study since tunas are highly migratory species with extensive international trade, tuna fisheries
being among the most valuable in the world. We use catch
data of Skipjack, Bigeye and Yellowfin tunas in the Atlantic
from the public database of the International Commission
for the Conservation of Atlantic Tunas. Data from longliners,
purse seiners and bait boats operating in the Atlantic from
1970 to 2015 is explored in order to investigate past trends of
fleet distribution. A spatiotemporal analysis is conducted
creating first a three dimensional (spatial and temporal) data
matrix of catches covering the study to detect catch latitudinal and longitudinal shifts. We expect statistically significant
catch distribution changes over time and will investigate how
these trends are related to environmental conditions, using
climate and biological satellite data (SST, chlorophyll, etc.).
We also expect to derive from our analysis the preferred temperature of the catch for the three tuna species. We will then
discuss the implications of changes in distribution in terms
of Economic Exclusive Zones and institutional arrangements
focusing on the Sustainable Fisheries Partnership Agreements
of the European Union. As a result of this study we can
derive policy implications for tropical tuna catches distribution shifts and international agreements.
10.2.8 Island Resort Runoff Threatens Reef
Ecosystems: An Isotopic Assessment
of the Extent and Impact of Sewage-Derived
Nitrogen Across Redang Island, Terengganu,
Peninsular Malaysia
Liam Lachs
1,2*
1
Marine Biology, Vrije Universiteit Brussel (VUB), 1050
Brussels, Belgium
2
Institute of Oceanography and Environment, Universiti
Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu,
Malaysia
*corresponding author: liamlachs@gmail.com
Coral reef resilience is widely accepted to be driven by a
site-specific combination of controls, the bottom-up control
of nutrient availability and the top-down control of herbivory, which both directly affect algal growth and competition
with coral. The herbivorous fish community on Redang is
assumed to be less affected by fishing, the primary source of
variation to herbivory, due to national marine park fishing
restrictions. Development of island tourism since 1995 in
marine parks of Terengganu has resulted in an increase in the
number of visitors from 22,725 to over 244,762, contributing
to enhancement of pollution and sewage runoff which may
present an ecosystem scale threat to the coral reefs across the
islands. The aim of this in situ study is to assess nitrogen
uptake by coral reef organisms from around Pulau Redang in
order to discern the ecological extent and impact of sewagederived nitrogen. The expected trend is of a higher isotopic
δ15N value close to sewage pollution. Differential rates of
isotopic fractionation between algae (short-term, days), herbivorous gastropods or bivalves (long-term, weeks or
months) allow both estimation of the pollution impact on
coral food web structure as well as determination of the most
suitable functional group for use as a bio-indicator.
Enrichment of δ15N values are expected in anthropogenically influenced fringing reefs on the eastern side of Redang
compared to more pristine reefs on the uninhabited northern
side. These northern sites may provide an isotopic baseline
for monitoring where new resort developments are planned.
The results of this study may contribute to the elucidation of
an ecosystem threshold of resort pollution, above which
coral reef communities become degraded, which would be of
great use as a tool for the sustainable management of these
vulnerable ecosystems.
10.3 Abstracts of Poster Presentations
10.3.1 The Failed Recovery of Atlantic Cod Stocks
Camilla Sguotti
1*
, Romain Frelat
1
, Saskia Otto
1
, Marie
Plambech
2
, Martin Lindegren
2
, Christian Möllmann
1
1
University of Hamburg, Institute for Hydrobiology and
Fisheries Science, Center for Earth
System Research and Sustainability (CEN), Hamburg,
Germany
2
Centre for Ocean Life, National Institute of Aquatic
Resources (DTU-Aqua), Technical
University of Denmark, Charlottenlund Castle, 2920
Charlottenlund, Denmark
*corresponding author: camilla.sguotti@uni-hamburg.de
Atlantic cod populations have been exploited for centuries and have experienced dramatic collapses over the last
decades. In order to facilitate the recovery of this ecologically and economically important species, drastic and
unpopular management measures have been implemented.
Here we conducted a meta-analysis on cod recovery based
on assessment data of 19 stocks over its distribution area in
the North Atlantic. Based on a set of recovery criteria, such
Appendices
*corresponding author: iratxe.rubio@bc3research.org
Keywords: Climate change, Tropical tunas, Transboundary
stocks, Industrial fisheries, Atlantic Ocean
There is broad evidence of climate change causing shifts
in fish distribution worldwide. This evidence concentrates
mostly in the North Atlantic Ocean, lacking observations in
tropical regions. According to the Intergovernmental Panel
on Climate Change, the strongest ocean warming will be in
tropical and Northern Hemisphere subtropical regions.
Therefore, we see a necessity of investigating impacts of climate change in tropical areas. Moreover, even if research has
documented shifts in fish distribution due to warming climates, less is known about the response of fisheries to these
shifts. For that purpose, fleets fishing tropical tunas have
been selected as a case study since tunas are highly migratory species with extensive international trade, tuna fisheries
being among the most valuable in the world. We use catch
data of Skipjack, Bigeye and Yellowfin tunas in the Atlantic
from the public database of the International Commission
for the Conservation of Atlantic Tunas. Data from longliners,
purse seiners and bait boats operating in the Atlantic from
1970 to 2015 is explored in order to investigate past trends of
fleet distribution. A spatiotemporal analysis is conducted
creating first a three dimensional (spatial and temporal) data
matrix of catches covering the study to detect catch latitudinal and longitudinal shifts. We expect statistically significant
catch distribution changes over time and will investigate how
these trends are related to environmental conditions, using
climate and biological satellite data (SST, chlorophyll, etc.).
We also expect to derive from our analysis the preferred temperature of the catch for the three tuna species. We will then
discuss the implications of changes in distribution in terms
of Economic Exclusive Zones and institutional arrangements
focusing on the Sustainable Fisheries Partnership Agreements
of the European Union. As a result of this study we can
derive policy implications for tropical tuna catches distribution shifts and international agreements.
10.2.8 Island Resort Runoff Threatens Reef
Ecosystems: An Isotopic Assessment
of the Extent and Impact of Sewage-Derived
Nitrogen Across Redang Island, Terengganu,
Peninsular Malaysia
Liam Lachs
1,2*
1
Marine Biology, Vrije Universiteit Brussel (VUB), 1050
Brussels, Belgium
2
Institute of Oceanography and Environment, Universiti
Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu,
Malaysia
*corresponding author: liamlachs@gmail.com
Coral reef resilience is widely accepted to be driven by a
site-specific combination of controls, the bottom-up control
of nutrient availability and the top-down control of herbivory, which both directly affect algal growth and competition
with coral. The herbivorous fish community on Redang is
assumed to be less affected by fishing, the primary source of
variation to herbivory, due to national marine park fishing
restrictions. Development of island tourism since 1995 in
marine parks of Terengganu has resulted in an increase in the
number of visitors from 22,725 to over 244,762, contributing
to enhancement of pollution and sewage runoff which may
present an ecosystem scale threat to the coral reefs across the
islands. The aim of this in situ study is to assess nitrogen
uptake by coral reef organisms from around Pulau Redang in
order to discern the ecological extent and impact of sewagederived nitrogen. The expected trend is of a higher isotopic
δ15N value close to sewage pollution. Differential rates of
isotopic fractionation between algae (short-term, days), herbivorous gastropods or bivalves (long-term, weeks or
months) allow both estimation of the pollution impact on
coral food web structure as well as determination of the most
suitable functional group for use as a bio-indicator.
Enrichment of δ15N values are expected in anthropogenically influenced fringing reefs on the eastern side of Redang
compared to more pristine reefs on the uninhabited northern
side. These northern sites may provide an isotopic baseline
for monitoring where new resort developments are planned.
The results of this study may contribute to the elucidation of
an ecosystem threshold of resort pollution, above which
coral reef communities become degraded, which would be of
great use as a tool for the sustainable management of these
vulnerable ecosystems.
10.3 Abstracts of Poster Presentations
10.3.1 The Failed Recovery of Atlantic Cod Stocks
Camilla Sguotti
1*
, Romain Frelat
1
, Saskia Otto
1
, Marie
Plambech
2
, Martin Lindegren
2
, Christian Möllmann
1
1
University of Hamburg, Institute for Hydrobiology and
Fisheries Science, Center for Earth
System Research and Sustainability (CEN), Hamburg,
Germany
2
Centre for Ocean Life, National Institute of Aquatic
Resources (DTU-Aqua), Technical
University of Denmark, Charlottenlund Castle, 2920
Charlottenlund, Denmark
*corresponding author: camilla.sguotti@uni-hamburg.de
Atlantic cod populations have been exploited for centuries and have experienced dramatic collapses over the last
decades. In order to facilitate the recovery of this ecologically and economically important species, drastic and
unpopular management measures have been implemented.
Here we conducted a meta-analysis on cod recovery based
on assessment data of 19 stocks over its distribution area in
the North Atlantic. Based on a set of recovery criteria, such
Appendices