Link between vertical and horizontal movement patterns of cod in the North Sea

Hobson, Victoria J.; Righton, David; Metcalfe, Julian D.; Hays, Graeme C.

doi:10.3354/ab00144

Cited by 22 publications

(21 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although depth data have been used in many previous studies to examine the movement of individuals within the water column (e.g., Schaefer and Fuller 2005;Kelly et al 2007;Hobson et al 2009), to date 3D activity spaces have not been used, presumably because of the lack of analytical tools accessible to biologists who collect tracking data. The development of new analytical tools, such as those within the R environment (http://www.r-project.org), now makes this analysis possible, and development of the present approach integrates mathematical concepts with telemetry data to provide an opportunity to better define movement parameters of tracked individuals.…”

Section: Discussionmentioning

confidence: 99%

“…However, advances in tracking technology are increasingly providing the opportunity to gather additional data beyond 2D location coordinates for a tracked individual. For example, many aquatic studies collect depth data to indicate what portion of the water column an animal is using (e.g., Schaefer and Fuller 2005;Kelly et al 2007;Hobson et al 2009). However, when vertical distribution data are collected, they are often analysed and displayed independent of location data.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional kernel utilization distributions improve estimates of space use in aquatic animals

Simpfendorfer

Olsen

Heupel

et al. 2012

Can. J. Fish. Aquat. Sci.

View full text Add to dashboard Cite

Tracking data have previously been used to define animal movement patterns through two-dimensional (2D) kernel utilization distributions and separate analysis of vertical locations. Here we describe the use of three-dimensional (3D) kernel utilization distributions to estimate the volumetric space use of individuals based on tracking data and to estimate the overlap in activity space between individuals. Data from European eels (Anguilla anguilla) from Norwegian coastal waters were used to compare the information conveyed by 2D and 3D activity space estimates and the utility of this approach for aquatic species. The use of 3D kernels produced detailed representations of space use in A. anguilla that permitted examination of depth use in a geographic context. Comparison of 2D and 3D home ranges showed that 2D analyses overestimated the amount of overlap between individuals by 13%-20%, because individuals sometimes occurred in the same location but used different depths. Hence, the 3D approach provided more comprehensive representations of animal movement in three dimensions while producing a metric that can be used for testing hypotheses relating to scientific descriptions of activity space, habitat use, and movement parameters.Résumé : Les données de repérage ont servi dans le passé à définir les patrons de déplacement des animaux à l'aide de distributions bidimensionnelles (2D) des noyaux d'utilisation et par analyse séparée des positions verticales. Nous décrivons ici l'utilisation de distributions tridimensionnelles (3D) des noyaux d'utilisation afin d'estimer l'utilisation volumétrique de l'espace par les individus d'après des données de repérage et pour évaluer le chevauchement dans l'espace des activités entre les individus. Nous utilisons des données sur des anguilles européennes (Anguilla anguilla) des eaux côtières de la Norvège pour comparer l'information fournie par les estimations 2D et 3D de l'espace des activités et évaluer l'utilité de cette métho-dologie pour les espèces aquatiques. L'emploi de noyaux 3D génère des représentations détaillées de l'utilisation de l'espace par A. anguilla qui permettent l'examen de l'utilisation de la profondeur dans un contexte géographique. Une comparaison des domaines vitaux 2D et 3D montre que les analyses 2D surestiment le chevauchement entre les individus de 13%-20%, parce que les individus peuvent quelquefois se retrouver au même point, mais utiliser des profondeurs différentes. Ainsi, la méthodologie 3D produit des représentations plus complètes des déplacements des animaux en trois dimensions, tout en fournissant une métrique que peut servir à tester des hypothèses concernant les descriptions scientifiques des paramètres de l'espace des activités, de l'utilisation des habitats et du déplacement.[Traduit par la Rédaction]

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-dimensional kernel utilization distributions improve estimates of space use in aquatic animals

Simpfendorfer

Olsen

Heupel

et al. 2012

Can. J. Fish. Aquat. Sci.

View full text Add to dashboard Cite

show abstract

“…This is in contrast to the behaviour seen in some offshore cod populations (Hobson et al . , ) and implies that night‐time ascents to shallower waters involved horizontal movements along the sea floor slope rather than pelagic vertical movements. A similar finding has been reported for benthic sharks (Sims et al .…”

Section: Discussionmentioning

confidence: 99%

Temperature‐associated habitat selection in a cold‐water marine fish

Freitas

Olsen

Knutsen

et al. 2015

Journal of Animal Ecology

View full text Add to dashboard Cite

Summary 1.Habitat selection is a complex process, which involves behavioural decisions guided by the multiple needs and constraints faced by individuals. Climate-induced changes in environmental conditions may alter those trade-offs and resulting habitat use patterns. 2. In this study, we investigated the effect of sea temperature on habitat selection and habitat use of acoustically tagged Atlantic cod (Gadus morhua) at the Norwegian Skagerrak coast. 3. Significant relationships between ocean temperature and habitat selection and use were found. Under favourable sea temperature thresholds (<16°C), cod selected vegetated habitats, such as eelgrass and macroalgae beds, available in shallow areas. Selection for those habitats was especially high at night, when cod tended to ascend to shallower areas, presumably to feed. Selection and use of those habitats decreased significantly as temperature rose. Under increased sea surface temperature conditions, cod were absent from vegetated shallow habitats, both during the day and night, and selected instead non-vegetated rocky bottoms and sand habitats, available in deeper, colder areas. 4. This study shows the dynamic nature of habitat selection and strongly suggests that cod in this region have to trade off food availability against favourable temperature conditions. Future increases in ocean temperature are expected to further influence the spatial behaviour of marine fish, potentially affecting individual fitness and population dynamics.

show abstract

“…When the column is isothermic, they consistently prefer shallow waters rich in prey (Clark & Green 1990, 1991. In the North Sea vertical behaviour is closely linked to horizontal movement (Hobson et al 2007(Hobson et al , 2009). …”

mentioning

confidence: 99%

Diel vertical migration patterns in juvenile cod from the Skagerrak coast

Espeland¹,

Thoresen²,

Olsen³

et al. 2010

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

We demonstrated a clear year-round diel vertical migration pattern (DVM) of small (26 to 45 cm) Skagerrak coastal cod Gadus morhua on a small geographic scale. Generalized additive models (GAMs) were used to make inferences about depth movements from a large data set of repeated depth measurements of cod fitted with acoustical tags. The general pattern in vertical behaviour was closely linked to sunrise and sunset, and the timing varied with the length of the day. The absolute magnitude of vertical movement was seasonally variable and probably influenced by temperature and food availability. Cod constantly selected deeper residence depths during the day than at night, and during winter than in summer. This study uses flexible models to make generalisations of the varying nature of the diel vertical migration patterns in juvenile coastal cod. KEY WORDS: Diel vertical migration · DVM · Generalized additive models · GAM · Coastal cod · Gadus morhua Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 405: [29][30][31][32][33][34][35][36][37] 2010 DVM as a food driven pattern in prey species may therefore induce a similar vertical migration in the predator species.Explanation (2) is based on the fact that temperature affects the metabolic processes of digesting food and growth (Imsland et al. 2005). Fish can regulate metabolic rate by actively choosing a depth with an optimal ambient temperature (Kristiansen et al. 2001); this 'hunt warm, rest cool' behaviour has been shown in many marine fish species (Sims et al. 2006, Mortensen et al. 2007.Novel technology in data storage tags (DST) and acoustic transmitters with depth sensors have allowed detailed studies of the vertical positions of marine organisms. Given batteries with long lifetimes and good storage capabilities some of these tags may produce 100 000 to 200 000 depth observations from a single fish. Coupled with low cost, this provides the opportunity to acquire large data sets on DVM on aquatic species. Making inferences on 'typical' movement, excluding variable individual effects and abnormal behaviour, may be challenging for large data sets. Generalized additive models (GAM) are ideal for describing patterns in biological data sets with complicated structure. Instead of predefining particular linear or nonlinear functional forms, such models 'let the data tell' by fitting local piecewise polynomials to the data. This makes GAMs more flexible than parametric models as they do not require any a priori definition of the shape of the relationship between predictors and response (Hastie & Tibshirani 1990).In this study, we observed the diel vertical migration of juvenile Atlantic cod Gadus morhua on the Norwegian Skagerrak coast and evaluated the factors influencing vertical movement in coastal cod. We expected the DVM patterns to be affected by the following factors: light intensity, ambient temperature and food availability. These factors exhibit large seasonal variations. We used GAMs as a tool for desc...

show abstract

Link between vertical and horizontal movement patterns of cod in the North Sea

Cited by 22 publications

References 65 publications

Three-dimensional kernel utilization distributions improve estimates of space use in aquatic animals

Three-dimensional kernel utilization distributions improve estimates of space use in aquatic animals

Temperature‐associated habitat selection in a cold‐water marine fish

Diel vertical migration patterns in juvenile cod from the Skagerrak coast

Contact Info

Product

Resources

About