Gudjon Mar Sigurdsson

Gudjon Mar Sigurdsson
Marine and Freshwater Research Institute | MRI · Pelagic division

Doctor of Philosophy

About

27
Publications
4,294
Reads
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142
Citations
Additional affiliations
September 2015 - present
Marine and Freshwater Research Institute
Position
  • Researcher
September 2009 - August 2015
University of New Brunswick
Position
  • PhD Student
May 2007 - May 2009
University of Iceland
Position
  • Master's Student
Education
January 2010 - March 2022
University of New Brunswick
Field of study
  • Marine biology
September 2007 - September 2009
University of Iceland
Field of study
  • Marine biology
September 2004 - May 2007
University of Iceland
Field of study
  • Biology

Publications

Publications (27)
Article
Full-text available
The overarching goal of ecology is to uncover natural patterns and the processes that underlie them. Importantly, both patterns and processes are dependent on scale. In this study, we assessed spatial patterns in benthic recruitment (density of young-of-year within a few months post-settlement) of American lobster in the Canadian Gulf of Maine by d...
Article
Homing and site fidelity of Atlantic wolffish Anarhichas lupus was studied at the main spawning ground and four different feeding grounds in Icelandic waters. A total of 883 fish were tagged with T-bar anchor tags, whereof 349 fish also received an internally implanted data storage tag (DST). The DSTs data revealed consistent year-to-year migration...
Article
Full-text available
Worldwide, incidental bycatch in fisheries is a conservation threat to many seabird species. Although knowledge on bycatch of seabirds has increased in the last decade, most stems from longline fisheries and the impacts of coastal gillnet fisheries are poorly understood. Gillnet fishing for North Atlantic lumpsucker (Cyclopterus lumpus) is one such...
Article
A Management Strategy Evaluation is used to estimate success at achieving conservation goals for marine mammals while also aiming to minimize impacts on commercial fisheries. It is intended to improve understanding of US import rules that require nations exporting fish and fish products to the US to adhere to marine mammal bycatch standards “compar...
Article
Full-text available
Very little is known about predation on early life stages of the American lobster, Homarus americanus Milne Edwards, 1837, including the identity of predators and the threat they represent. In this laboratory experiment, we investigated the predatory threat that green crabs, Carcinus maenas (Linnaeus, 1758), and sand shrimp, Crangon septemspinosa S...
Article
Full-text available
This tool provides a way for managers and other stakeholders to explore bycatch scenarios, based on simple information about marine mammal life history and rough estimates of abundance and bycatch. The tool consists of an R package (R Core Team, 2021) and a Shiny application (Chang et al., 2021). The primary machinery in the package is an age-struc...
Article
Full-text available
ÁRIÐ 2017 veiddist brislingur (Sprattus sprattus) í fyrsta sinn á Íslandsmiðum svo vitað sé. Á næstu árum fjölgaði brislingum sem veiddust við landið og í rannsóknarleiðangri í mars 2021 fengust alls 375 brislingar, einkum fyrir Suður- og Vesturlandi. Í leiðöngrum haustið 2021 fengust um 300 brislingar, nokkrir við Suðurland og í Faxaflóa en flesti...
Article
Full-text available
Accurate reporting of cetacean bycatch in/interaction with fishing gear in fisher logbooks would be of immense scientific value; however, despite some countries having mandatory reporting laws, logbook reporting is widely considered unreliable and cetacean catches are thought to be under-reported. Despite this widespread notion of logbook unreliabi...
Article
Full-text available
Fisheries bycatch is the greatest current source of human-caused deaths of marine mammals worldwide, with severe impacts on the health and viability of many populations. Recent regulations enacted in the United States under the Fish and Fish Product Import Provisions of its Marine Mammal Protection Act require nations with fisheries exporting fish...
Article
Full-text available
The Arctic Ocean (including sub-Arctic margins) is one of the fastest changing ecosystems affected by climate change. However, much remains unknown about its ecosystematic functioning, trophic interactions, and species diversity. Plankton communities have been studied to some extent, but gelatinous zooplankton (GZ; cnidarians, ctenophores, pelagic...
Article
Full-text available
Bycatch in marine fisheries is the leading source of human-caused mortality for marine mammals, has contributed to substantial declines of many marine mammal populations and species, and the extinction of at least one. Schemes for evaluating marine mammal bycatch largely rely on estimates of abundance and bycatch, which are needed for calculating b...
Article
Full-text available
Motivated by the need to estimate the abundance of marine mammal populations to inform conservation assessments, especially relating to fishery bycatch, this paper provides background on abundance estimation and reviews the various methods available for pinnipeds, cetaceans and sirenians. We first give an “entry-level” introduction to abundance est...
Technical Report
Full-text available
The Working Group on Beam Trawl Surveys (WGBEAM) coordinates and implements European inshore and offshore beam trawl surveys, including planning, standardization, data transmission and data quality assurance. The group also coordinates the Italian/Croatian/Slovenian beam trawl survey in the Adriatic Sea as there is no other body in the EU coordinat...
Article
Full-text available
The effects of human-caused mortality, such as fisheries bycatch, of endangered, threatened and protected (ETP) species of marine mammals can be evaluated using population model-based stock assessments. The information available to conduct such assessments is often very limited. Available data might include fragmented time-series of abundance estim...
Article
Full-text available
Determining acceptable rates of human‐caused mortality in low‐data situations is a concern for many taxa worldwide. An established approach for determining acceptable levels of human‐caused mortality of marine mammals and other species of conservation concern is the Potential Biological Removal (PBR) framework, but PBR requires near‐unbiased estima...
Article
The potential biological removal (PBR) formula used to determine a reference point for human-caused mortality of marine mammals in the United States has been shown to be robust to several sources of uncertainty. This study investigates the consequences of the quality of monitoring on PBR performance. It also explores stochastic and demographic unce...
Article
Full-text available
The potential biological removal (PBR) formula used to determine a reference point for human-caused mortality of marine mammals in the United States has been shown to be robust to several sources of uncertainty. This study investigates the consequences of the quality of monitoring on PBR performance. It also explores stochastic and demographic unce...
Technical Report
Full-text available
Gerð er grein fyrir helstu niðurstöðum Stofnmælingar botnfiska að haustlagi sem fram fór dagana 26. september til 3. nóvember 2019. Niðurstöður eru bornar saman við fyrri ár, en verkefnið hefur verið framkvæmt með sambærilegum hætti frá 1996.
Article
Full-text available
Worldwide, incidental bycatch in fisheries is a conservation threat to many seabird species. Although knowledge on bycatch of seabirds has increased in the last decade, most stems from longline fisheries and the impacts of coastal gillnet fisheries are poorly understood. Gillnet fishing for North Atlantic lumpsucker (Cyclopterus lumpus) is one such...
Preprint
Full-text available
The common fisheries policy aims at eliminating discarding which has been part of fisheries for centuries. It is important to monitor the compliance with the new regulations but estimating the discard rate is a challenging task, especially where the practise is illegal. The aim of this study was to review a length-based method that has been used to...
Technical Report
Full-text available
Stock assessment for plaice (Pleuronectes platessa) and dab (Limanda limanda) in Icelandic waters has historically been limited by lack of recruitment data due to the fact that younger fish are rarely caught in the existing bottom trawl surveys. A pilot survey with a beam trawl in the coastal waters of western Iceland was conducted in 2016 and was...
Technical Report
Full-text available
This report covers the results of discard estimates carried out in Icelandic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) fisheries in 2014 and 2015 and compares those results with previous estimates of discards since 2001 when this project was started. Data was collected in the long-line and gill net fisheries for cod, and the long-li...
Technical Report
Full-text available
Stock assessment for plaice (Pleuronectes platessa) and dab (Limanda limanda) in Icelandic waters has historically been limited by lack of recruitment data due to the fact that younger sh are rarely caught in the existing bottom trawl surveys. A new survey with a beam trawl in coastal waters could bridge that gap. The objective of this study was th...
Article
Full-text available
We built a simple and relatively inexpensive light trap and tested its efficacy at catching pelagic larvae of the American lobster Homarus americanus Milne Edwards, 1837 in the field and the laboratory. We were particularly interested in assessing the potential of using these traps to support research on pelagic-benthic coupling, and therefore cont...

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Projects

Project (1)
Archived project
Population dynamics of the Icelandic harbour seal