Blar i Bergen Open Research Archive på forfatter "Geffen, Audrey J."
-
Advances in herring biology: from simple to complex, coping with plasticity and adaptability
Geffen, Audrey J. (Peer reviewed; Journal article, 2009)At least two centuries of investigations on herring have been absorbed by scientific journals, and applied and fundamental research has produced groundbreaking concepts in fisheries, population biology, and marine ecology. ... -
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. (Journal article; Peer reviewed, 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. (Journal article; Peer reviewed, 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 ... -
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. (Journal article; Peer reviewed, 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 ... -
Elemental composition of illicia and otoliths and their potential application to age validation in white anglerfish (Lophius piscatorius linnaeus, 1758)
Brophy, Deirdre; Pérez-Mayol, Silvia; Duncan, Roxanne; Hüssy, Karin; Geffen, Audrey J.; Gerritsen, Hans D.; Villanueva, Maria Ching; Morales-Nin, Beatriz (Journal article; Peer reviewed, 2021)The incorporation of trace elements into the calcified structures of fish can vary seasonally. Interpretation of these seasonal signals can provide information about fish age. This approach offers great promise for objectively ... -
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 (Journal article; Peer reviewed, 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 ... -
Host choice and fitness of anemonefish Amphiprion ocellaris (Perciformes: Pomacentridae) living with host anemones (Anthozoa: Actiniaria) in captive conditions
Nguyen, Hai-Thanh T.; Tran, A-Nga T; Ha, Le Thi L; Ngo, Dang N; Dang, Binh Thuy; Geffen, Audrey J. (Peer reviewed; Journal article, 2019)In this study, we investigated the host choice of naïve Amphiprion ocellaris , a specialist, at two different stages of development (newly settling juveniles and post‐settlement juveniles). The fish were exposed to their ... -
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 (Journal article; Peer reviewed, 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 ... -
Limited evidence for species-specific sensitivity of temperature-dependent fractionation of oxygen stable isotope in biominerals: A meta-analysis
Morissette, Olivier; Trueman, Clive N.; Sturrock, Anna M.; Geffen, Audrey J.; Shirai, Kotaro (Journal article; Peer reviewed, 2023)Water temperature is key to the study of aquatic ectotherm ecology, but precise measurements of individual-based thermal experience remain difficult to validate. The stable isotope composition of oxygen in biominerals acts ... -
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 (Journal article; Peer reviewed, 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 ... -
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. (Journal article; Peer reviewed, 2020-04-06)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 (Journal article; Peer reviewed, 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 ... -
Periodicity of otolith check formation in the juvenile plaice Pleuronectes platessa
Geffen, Audrey J.; Nash, R. D. M. (Belle W.Baruch Library in Marine Science; 19, Chapter; Peer reviewed, 1995)Juvenile (Pleuronectes platessa L.) were sampled in the intertidal zone of Port Erin Bay (Isle of Man, Irish Sea) by push-net in the summers of 1990 and 1992. Check formation on the sagittal otoliths was examined to test ... -
Variability in transport of fish eggs and larvae. IV. Interannual variability in larval stage duration of immigrating plaice in the Dutch Wadden Sea
van der Veer, Henk; Bolle, Loes J.; Geffen, Audrey J.; Witte, Johannes IJ. (Peer reviewed; Journal article, 2009-09-18)Larval immigration of plaice Pleuronectes platessa L. into the western Wadden Sea in spring was followed biweekly from 1993 to 2002. For each year (1993 excluded), 150 settling individuals were selected and used for ...