Browsing Brage IMR by Author "Geffen, Audrey J."
Now showing items 1-16 of 16
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Birth-date selection in early life stages of plaice Pleuronectes platessa in the eastern Irish Sea (British Isles)
Fox, Clive J.; Geffen, Audrey J.; Taylor, Natasha; Davison, Phil; Rossetti, Helen; Nash, Richard D.M. (Journal article; Peer reviewed, 2007-09-13)For species with extended spawning seasons, short periods of beneficial conditions often lead to disproportionate survival of sub-sets of the offspring. This has been demonstrated for freshwater fish and for marine pelagic ... -
A century of fish growth in relation to climate change, population dynamics and exploitation
Denechaud, Come; Smolinski, Szymon; Geffen, Audrey J.; Godiksen, Jane Aanestad; Campana, Steven E. (Peer reviewed; Journal article, 2020)Marine ecosystems, particularly in high‐latitude regions such as the Arctic, have been significantly affected by human activities and contributions to climate change. Evaluating how fish populations responded to past changes ... -
Century-long cod otolith biochronology reveals individual growth plasticity in response to temperature
Smolinski, Szymon; Deplanque-Lasserre, Julie; Hjörleifsson, Einar; Geffen, Audrey J.; Godiksen, Jane Aanestad; Campana, Steven E. (Peer reviewed; Journal article, 2020)Otolith biochronologies combine growth records from individual fish to produce long-term growth sequences, which can help to disentangle individual from population-level responses to environmental variability. This study ... -
Development of Atlantic cod (Gadus morhua) exposed to produced water during early life stages: Effects on embryos, larvae, and juvenile fish
Meier, Sonnich; Morton, H. Craig; Nyhammer, Gunnar; Grøsvik, Bjørn Einar; Makhotin, Valeri; Geffen, Audrey J.; Boitsov, Stepan; Kvestad, Karen Anita; Bohne-Kjersem, Anneli; Goksøyr, Anders; Folkvord, Arild; Klungsøyr, Jarle; Svardal, Asbjørn Martin (Journal article; Peer reviewed, 2010-08-21)Produced water (PW) contains numerous toxic compounds of natural origin, such as dispersed oil, metals, alkylphenols (APs), and polycyclic aromatic hydrocarbons (PAHs). In addition, PW also contains many different chemicals ... -
Differences in metabolic rate between two Atlantic cod (Gadus morhua) populations estimated with carbon isotopic composition in otoliths
Smolinski, Szymon; Denechaud, Come; von Leesen, Gotje; Geffen, Audrey J.; Grønkjær, Peter; Godiksen, Jane A.; Campana, Steven E. (Peer reviewed; Journal article, 2021)The isotopic composition of inorganic carbon in otoliths (δ13Coto) can be a useful tracer of metabolic rates and a method to study ecophysiology in wild fish. We evaluated environmental and physiological sources of δ13Coto ... -
Dynamics of shallow-water juvenile flatfish nursery grounds: application of the self-thinning rule
Nash, Richard D.M.; Geffen, Audrey J.; Burrows, Michael T.; Gibson, Robin N. (Journal article; Peer reviewed, 2007-08-23)Annual development of density and mean weight of juvenile plaice Pleuronectes platessa was examined at 2 nursery grounds (Port Erin Bay, Isle of Man, Irish Sea and Admucknish Bay, Firth of Lorne, west coast of Scotland) ... -
Effects on development, sex differentiation and reproduction of Atlantic cod exposed to produced water during early life stages
Meier, Sonnich; Grøsvik, Bjørn Einar; Nyhammer, Gunnar; Geffen, Audrey J.; Knag, Anne Christine; Makhotin, Valeri; Morton, H. Craig; Boitsov, Stepan; Klungsøyr, Jarle (Conference object, 2007-05-20)Two long term studies to assess the effects of produced water (0.01-1 %) on the early life stages of cod were performed. Experiment 1 examined the egg to early fry stage (90 days), and experiment 2 examined the early ... -
Growth portfolios buffer climate-linked environmental change in marine systems
Campana, Steven E.; Smolinski, Szymon; Black, Bryan A.; Morrongiello, John R.; Alexandroff, Stella J.; Andersson, Carin; Bogstad, Bjarte; Butler, Paul G.; Denechaud, Côme; Frank, David C.; Geffen, Audrey J.; Godiksen, Jane Aanestad; Grønkjær, Peter; Hjörleifsson, Einar; Jónsdóttir, Ingibjörg G.; Meekan, Mark; Mette, Madelyn; Tanner, Susanne E.; van der Sleen, Peter; von Leesen, Gotje (Peer reviewed; Journal article, 2022)Large-scale, climate-induced synchrony in the productivity of fish populations is becoming more pronounced in the world's oceans. As synchrony increases, a population's “portfolio” of responses can be diminished, in turn ... -
Growth portfolios buffer climate-linked environmental change in marine systems
Campana, Steven E.; Smolinski, Szymon; Black, Bryan A.; Morrongiello, John R.; Alexandroff, Stella J.; Andersson, Carin; Bogstad, Bjarte; Butler, Paul G.; Denechaud, Côme; Frank, David C.; Geffen, Audrey J.; Godiksen, Jane Aanestad; Grønkjær, Peter; Hjörleifsson, Einar; Jónsdóttir, Ingibjörg G.; Meekan, Mark; Mette, Madelyn; Tanner, Susanne E.; van der Sleen, Peter; von Leesen, Gotje (Peer reviewed; Journal article, 2022)Large-scale, climate-induced synchrony in the productivity of fish populations is becoming more pronounced in the world's oceans. As synchrony increases, a population's “portfolio” of responses can be diminished, in turn ... -
Lemon sole Microstomus kitt in the northern North Sea: a multidisciplinary approach to the early life-history dynamics
Geffen, Audrey J.; Albretsen, Jon; Huwer, Bastian; Nash, Richard David Marriott (Peer reviewed; Journal article, 2021)Lemon sole Microstomus kitt is a commercially valuable flatfish species that occurs in shelf waters around the northeast Atlantic. Only the most basic life-history information is available for the North Sea. Spawning is ... -
Linking dispersal connectivity to population structure and management boundaries for saithe in the Northeast Atlantic
Myksvoll, Mari Skuggedal; Devine, Jennifer Ann; Quintela, Maria; Geffen, Audrey J.; Nash, Richard David Marriott; Sandvik, Anne Dagrun; Besnier, Francois; Saha, Atal; Dahle, Geir; Jansson, Eeva; Nedreaas, Kjell Harald; Johansen, Torild (Peer reviewed; Journal article, 2021)Population connectivity is an increasingly important focal area for the understanding of how marine fish populations respond to anthropogenic pressures like climate change and fisheries. Our model species, the saithe ... -
Mortality schedules in the early life history phases of juvenile flatfish: European plaice (Pleuronectes platessa) as a case study
Nash, Richard D.M.; Geffen, Audrey J. (ICES CM documents;2009/T:10, Working paper, 2009)The estimation of natural mortality in early life history stages of fish is difficult because the appropriate data are scarce. Many flatfish, and in particular, plaice (Pleuronectes platessa) have been extensively studied ... -
Ontogenetic movements of cod in Arctic fjords and the Barents Sea as revealed by otolith microchemistry
Andrade Rodriguez, Hector Antonio; van der Sleen, Peter; Black, Bryan A.; Godiksen, Jane Aanestad; Locke V, William L.; Carroll, Michael Leslie; Ambrose, William G. Jr.; Geffen, Audrey J. (Peer reviewed; Journal article, 2020)The distribution of Atlantic cod (Gadus morhua) in northern Norwegian waters is expanding eastward and northward in the Barents Sea and along western Svalbard. In the Arctic fjords of Svalbard, cod has become abundant, but ... -
Otolith “spawning zones” across multiple Atlantic cod populations: Do they accurately record maturity and spawning?
Denechaud, Côme; Geffen, Audrey J.; Smolinski, Szymon; Godiksen, Jane Aanestad (Peer reviewed; Journal article, 2021)Specific changes identified in the otolith macrostructure of Northeast Arctic cod as “spawning zones” are presumed to represent spawning events, but recent experimental studies have challenged this relationship. Because ... -
Temperature effect on growth and larval duration of plaice Pleuronectes platessa in three regions of the Northeast Atlantic
Comerford, Stephen; Brophy, Deirdre; Fox, Clive J.; Taylor, Natasha; van der Veer, Henk W.; Nash, Richard D.M.; Geffen, Audrey J. (Journal article; Peer reviewed, 2013-02-27)Transport models for planktonic fish eggs and larvae often use temperature to drive growth because temperature data are readily available. This pragmatic approach can be criticised as too simplistic as it ignores additional ... -
WESTHER: A multidisciplinary approach to the identification of herring (Clupea harengus L.) stock components west of the British Isles using biological tags and genetic markers.
Hatfield, Emma M. C.; Zuur, Alain F.; Boyd, John; Campbell, Neil; Chubb, James C.; Collins, Catherine M.; Coughlan, Jamie; Cross, Marcus A.; Cross, Tom F.; Cunningham, Carey O.; Geffen, Audrey J.; MacKenzie, K.; Nash, Richard D.M.; Jansen, Soenke; Kay, Suzanne M.; Kelly, Ciarán J.; O'Leary, David B.; Schlickeisen, Jürgen; Schön, Pieter-Jan; Watts, Phillip C.; Zimmermann, Christopher (ICES CM documents;2005/K:01, Working paper, 2005)A considerable amount of research has been carried out on the complex of commercially important herring stocks to the west of the British Isles, from the south-west of Ireland and the Celtic Sea to the north-west of Scotland. ...