1,721,033 research outputs found
Data for: Time at risk: Individual spatial behaviour drives effectiveness of marine protected areas and fitness
No full text[Methods] Acoustic telemetry.--[Usage Notes] There is one file per species and year of tagging. Each file is an R object. Opening it with R, the estimated centers of activity for each group of fish will be shown; these centers of activity are then used for subsequent analyses. An excel file is also provided containing the biological characteristics of the tagged animals.The effectiveness of Marine Protected Areas (MPAs) depends on the mobility of the populations that are the target of protection, with sedentary species likely to spend more time under protection even within small MPAs. However, little is understood about how individual variation in mobility may influence the risk of crossing an MPA border, as well as the fitness costs associated with being exposed to spillover fisheries. Here we investigated the repeatability of spatial behaviour, its role in determining the probability of being at risk (i.e. exposed to the fishery) and the fitness consequences for the individuals. We acoustically tracked the movements and fate of 282 individuals of three fish species during 8 years in a southern Norwegian fjord. We found that for individuals with a home range centroid inside the MPA, the probability of being at risk outside the MPA increased rapidly with reduced distance from the home range centroid to MPA borders, particularly for individuals having larger and more dispersed home ranges. We also detected that the seasonal expansions of the home range are associated with increased time at risk. Last, we show that individuals spending more time at risk were also more likely to be harvested by the fishery operating outside the MPA. Our study provides clear links between individual fish behaviour, fisheries-induced selection, and the effectiveness of protected areas. These links highlight the importance of intraspecific trait variation for understanding the spatial dynamics of populations and emphasize the need to consider individual behaviour when designing and implementing MPAs.cleanCOAS_ballan2013.rds.-- cleanCOAS_ballan2015.rds.-- cleanCOAS_ballan2016.rds.-- cleanCOAS_ballan2017.rds.-- cleanCOAS_ballan2018.rds.-- cleanCOAS_cod2011.rds.-- cleanCOAS_cod2012.rds.-- cleanCOAS_cod2013.rds.-- cleanCOAS_cod2014.rds.-- cleanCOAS_cod2015.rds.-- cleanCOAS_cod2016.rds.-- cleanCOAS_cod2017.rds.-- cleanCOAS_cod2018.rds.-- cleanCOAS_pollack2015.rds.-- cleanCOAS_pollack2016.rds.-- cleanCOAS_pollack2017.rds.-- cleanCOAS_pollack2018.rds.-- fish_data.csvPeer reviewe
Inferring individual fate from aquatic acoustic telemetry data
Full text linkAcoustic telemetry has become a popular means of obtaining individual behavioural data from a wide array of species in marine and freshwater systems. Fate information is crucial to understand important aspects of population dynamics such as mortality, predation or dispersal rates.
Here we present a method to infer individual fate from acoustic telemetry arrays of receivers with overlapping detection ranges. Our method depends exclusively on information on animal movements and the characteristics and configuration of the telemetry equipment. By answering a limited number of simple questions, our method identifies six different fates: tagging mortality, natural mortality, fishing mortality, predation, dispersal and survival.
Applying the method to a cod telemetry dataset, we were able to determine the fate of 97% of the individuals. We validate the results using several external sources of information, such as recaptures from fishers and control fish with known fate.
The method is readily applicable to a wide array of species with minimal adjustments, expanding the range of hypotheses that can be tested using telemetry data
Sea temperature effects on depth use and habitat selection in a marine fish community
Full text linkUnderstanding the responses of aquatic animals to temperature variability is essential to predict impacts of future climate change and to inform conservation and management. Most ectotherms such as fish are expected to adjust their behaviour to avoid extreme temperatures and minimize acute changes in body temperature. In coastal Skagerrak, Norway, sea surface temperature (SST) ranges seasonally from 0 to over 20°C, representing a challenge to the fish community which includes cold-, cool- and warm-water affinity species.publishedVersio
Atlantic cod individual spatial behaviour and stable isotope associations in a no-take marine reserve
No full text<ol>
<li>Foraging is a behavioural process and, therefore, individual behaviour and diet are theorized to covary. However, few comparisons of individual behaviour type and diet exist in the wild.</li>
<li>We tested whether behaviour type and diet covary in a protected population of Atlantic cod, <em>Gadus</em> <em>morhua</em>. </li>
<li>Working in a no-take marine reserve, we could collect data on natural behavioural variation and diet choice with minimal anthropogenic disturbance. We inferred behaviour using acoustic telemetry and diet from stable isotope compositions (expressed as δ<sup>13</sup>C and δ<sup>15</sup>N values). We further investigated whether behaviour and diet could have survival costs.</li>
<li>We found cod with shorter diel vertical migration distances fed at higher trophic levels. Cod δ<sup>13</sup>C and δ<sup>15</sup>N values scaled positively with body size. Neither behaviour nor diet predicted survival, indicating phenotypic diversity is maintained without survival costs for cod in a protected ecosystem.</li>
<li>The links between diet and diel vertical migration highlight that future work is needed to understand whether the shifts in this behaviour during environmental change (e.g. fishing or climate), could lead to trophic cascades. </li>
</ol><p>Funding provided by: Research Council of Norway<br>Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100005416<br>Award Number: CODSIZE 294926</p><p>Funding provided by: Natural Sciences and Engineering Research Council of Canada<br>Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100000038<br>Award Number: </p><p>Funding provided by: HORIZON EUROPE Marie Sklodowska-Curie Actions<br>Crossref Funder Registry ID: http://dx.doi.org/10.13039/100018694<br>Award Number: 793627</p><p>Funding provided by: Spanish National Research Council<br>Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100003339<br>Award Number: </p><p>Funding provided by: Academy of Finland<br>Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100002341<br>Award Number: 317495</p><p>Funding provided by: European Research Council<br>Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100000781<br>Award Number: 770884</p>
Genomic Landscape of Divergence in Ballan Wrasse (Labrus bergylta) [Dataset]
No full text4 filesThis is the final dataset used in Jansson et al. (2025 study "Genomic landscape of divergence in Ballan wrasse (Labrus bergylta)" published in Molecular EcologyPeer reviewe
Interannual fine‐scale site fidelity of male ballan wrasse Labrus bergylta revealed by photo‐identification and tagging
No full text5 pages, 2 figures, 1 tableThe site fidelity of ballan wrasse Labrus bergylta was studied using photo‐identification and external tagging. Five male individuals were observed to defend the same small territory composed of a few rocks during several reproductive seasons spanning 2 to 15 years. These results provide one of the strongest indications of long‐term very fine‐scale site fidelity in marine fishesThis project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska‐Curie grant agreement No 793627 (BEMAR) and Isabel Barreto human resources plan of Xunta de Galicia (Spain)Peer reviewe
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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