GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Sympatric Atlantic puffins and razorbills show contrasting responses to adverse marine conditions during winter foraging within the North Sea
    Springer Science and Business Media LLC ; 2019
    In:  Movement Ecology Vol. 7, No. 1 ( 2019-12)
    Details
    In: Movement Ecology, Springer Science and Business Media LLC, Vol. 7, No. 1 ( 2019-12)
    Abstract: Natural environments are dynamic systems with conditions varying across years. Higher trophic level consumers may respond to changes in the distribution and quality of available prey by moving to locate new resources or by switching diets. In order to persist, sympatric species with similar ecological niches may show contrasting foraging responses to changes in environmental conditions. However, in marine environments this assertion remains largely untested for highly mobile predators outside the breeding season because of the challenges of quantifying foraging location and trophic position under contrasting conditions. Method Differences in overwinter survival rates of two populations of North Sea seabirds (Atlantic puffins ( Fratercula arctica ) and razorbills ( Alca torda )) indicated that environmental conditions differed between 2007/08 (low survival and thus poor conditions) and 2014/15 (higher survival, favourable conditions). We used a combination of bird-borne data loggers and stable isotope analyses to test 1) whether these sympatric species showed consistent responses with respect to foraging location and trophic position to these contrasting winter conditions during periods when body and cheek feathers were being grown (moult) and 2) whether any observed changes in moult locations and diet could be related to the abundance and distribution of potential prey species of differing energetic quality. Results Puffins and razorbills showed divergent foraging responses to contrasting winter conditions. Puffins foraging in the North Sea used broadly similar foraging locations during moult in both winters. However, puffin diet significantly differed, with a lower average trophic position in the winter characterised by lower survival rates. By contrast, razorbills’ trophic position increased in the poor survival winter and the population foraged in more distant southerly waters of the North Sea. Conclusions Populations of North Sea puffins and razorbills showed contrasting foraging responses when environmental conditions, as indicated by overwinter survival differed. Conservation of mobile predators, many of which are in sharp decline, may benefit from dynamic spatial based management approaches focusing on behavioural changes in response to changing environmental conditions, particularly during life history stages associated with increased mortality.
    Type of Medium: Online Resource
    ISSN: 2051-3933
    URL: Article
    DOI: 10.1186/s40462-019-0174-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 2724975-X
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter
    American Geophysical Union (AGU) ; 2021
    In:  Global Biogeochemical Cycles Vol. 35, No. 9 ( 2021-09)
    Details
    In: Global Biogeochemical Cycles, American Geophysical Union (AGU), Vol. 35, No. 9 ( 2021-09)
    Abstract: First carbon and nitrogen isoscape predictions of the entire Southern Ocean, based on particulate organic matter isotope data Clear spatial gradients in δ 13 C and δ 15 N values were predicted, consistent with previously reported isotopic variability in this region Key implications for the use of isoscape baselines in animal studies attempting to document seasonal migratory or foraging behaviors
    Type of Medium: Online Resource
    ISSN: 0886-6236 , 1944-9224
    URL: Article
    DOI: 10.1029/2020GB006901
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2021
    detail.hit.zdb_id: 2021601-4
    SSG: 12
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Stable isotope‐based location in a shelf sea setting: accuracy and precision are comparable to light‐based location methods
    Wiley ; 2017
    In:  Methods in Ecology and Evolution Vol. 8, No. 2 ( 2017-02), p. 232-240
    Details
    In: Methods in Ecology and Evolution, Wiley, Vol. 8, No. 2 ( 2017-02), p. 232-240
    Abstract: Retrospective determination of location for marine animals would facilitate investigations of migration, connectivity and food provenance. Predictable spatial variations in carbon and nitrogen isotopes in primary production across shelf seas provide a basis for stable isotope‐based location. Here, we assess the accuracy and precision that can be obtained through dietary‐isotope‐based location methods. We build isoscapes from jellyfish tissues and use these to assign scallops of fixed and known individual location, and herring with well‐understood population‐level distributions in the North Sea. Accuracy and precision for retrospective isotope‐based location in the North Sea were of a similar order to light‐based location devices, with 75% of individual scallops assigned correctly to areas representing c . 30% of the North Sea, with a mean linear error on the order of 10 2  km. Applying assignment methods to an alternative migratory species (herring) resulted in ecologically realistic assignments consistent with fisheries survey data. Location methods based on dietary isotopes such as carbon and nitrogen recover the spatial origin of nutrients assimilated into tissues, and this may not correspond directly to the physical location if either the test animal or its prey is highly migratory. Stable isotope‐based location can be applied to any marine‐feeding organism or derived food product, but the ecological meaning of any assigned area will be more difficult to interpret for large, high trophic level, migratory animals with relatively slow isotopic assimilation rates.
    Type of Medium: Online Resource
    ISSN: 2041-210X , 2041-210X
    URL: Issue
    URL: Article
    DOI: 10.1111/mee3.2017.8.issue-2
    DOI: 10.1111/2041-210X.12651
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2528492-7
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    A future for seafood point-of-origin testing using DNA and stable isotope signatures
    Springer Science and Business Media LLC ; 2022
    In:  Reviews in Fish Biology and Fisheries Vol. 32, No. 2 ( 2022-06), p. 597-621
    Details
    In: Reviews in Fish Biology and Fisheries, Springer Science and Business Media LLC, Vol. 32, No. 2 ( 2022-06), p. 597-621
    Abstract: Demand for seafood products is increasing worldwide, contributing to ever more complex supply chains and posing challenges to trace their origin and guarantee legal, well-managed, sustainable sources from confirmed locations. While DNA-based methods have proven to be reliable in verifying seafood authenticity at the species level, the verification of geographic origin remains inherently more complex. Both genetic and stable isotope analyses have been employed for determining point-of-origin with varying degrees of success, highlighting that their application can be effective when the right tool is selected for a given application. Developing an a priori prediction of their discrimination power for different applications can help avoid the financial cost of developing inappropriate reference datasets. Here, we reviewed the application of both techniques to seafood point-of-origin for 63 commercial finfish species certified by the Marine Stewardship Council, and showed that, even for those species where baseline data exist, real applications are scarce. To fill these gaps, we synthesised current knowledge on biological and biogeochemical mechanisms that underpin spatial variations in genetic and isotopic signatures. We describe which species’ biological and distribution traits are most helpful in predicting effectiveness of each tool. Building on this, we applied a mechanistic approach to predicting the potential for successful validation of origin to three case study fisheries, using combined genetic and isotopic methodologies to distinguish individuals from certified versus non-certified regions. Beyond ecolabelling applications, the framework we describe could be reproduced by governments and industries to select the most cost-effective techniques. Graphic abstract
    Type of Medium: Online Resource
    ISSN: 0960-3166 , 1573-5184
    URL: Article
    DOI: 10.1007/s11160-021-09680-w
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 30768-3
    detail.hit.zdb_id: 1498719-3
    SSG: 21,3
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Spatial models of carbon, nitrogen and sulphur stable isotope distributions (isoscapes) across a shelf sea: An INLA approach
    Wiley ; 2019
    In:  Methods in Ecology and Evolution Vol. 10, No. 4 ( 2019-04), p. 518-531
    Details
    In: Methods in Ecology and Evolution, Wiley, Vol. 10, No. 4 ( 2019-04), p. 518-531
    Abstract: Spatial models of variation in the isotopic composition of structural nutrients across habitats (isoscapes) offer information on physical, biogeochemical and anthropogenic processes occurring across space, and provide a tool for retrospective assignment of animals or animal products to their foraging area or geographic origin. The isotopic differences among reference samples used to construct isoscapes may vary spatially and according to non‐spatial terms (e.g. sampling date, or among individual or species effects). Partitioning variance between spatially dependent and spatially independent terms is a critical but overlooked aspect of isoscape creation with important consequences for the design of studies collecting reference data for isoscape creation and the accuracy and precision of isoscape models. We introduce the use of integrated nested Laplace approximation ( INLA ) to construct isoscape models. Integrated nested Laplace approximation provides a computationally efficient framework to construct spatial models of isotopic variability explicitly addressing additional variation introduced by including multiple reference species (or other recognized sources of variance). We present carbon, nitrogen and sulphur isoscape models extending over c . 1 million km 2 of the UK shelf seas. Models were built using seven different species of jellyfish as spatial reference data and a suite of environmental correlates. Compared to alternative isoscape prediction methods, INLA ‐spatial isotope models show high spatial precision and reduced variance. We briefly discuss the likely biogeochemical explanations for the observed spatial isotope distributions. We show for the first time that sulphur isotopes display systematic spatial variation across open marine shelf seas and may therefore be a useful additional tool for marine spatial ecology. The INLA technique provides a promising tool for generating isoscape models and associated uncertainty surfaces where reference data are accompanied by multiple, quantifiable sources of uncertainty.
    Type of Medium: Online Resource
    ISSN: 2041-210X , 2041-210X
    URL: Issue
    URL: Article
    DOI: 10.1111/mee3.2019.10.issue-4
    DOI: 10.1111/2041-210X.13138
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2528492-7
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...