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@article{Bauer2017a,
abstract = {We investigated the habitat utilization, vertical and horizontal behaviour of Atlantic bluefin tuna Thunnus thynnus (ABFT) in relation to oceanographic conditions in the northwestern Mediterranean Sea, based on 36 pop-up archival tags and different environmental data sets. Tags were deployed on early mature ABFT (127–255 cm) between July and November in 2007-2014, on the shelf area off Marseille, France. The data obtained from these tags provided 1643 daily summaries of ABFT vertical behaviour over 8 years of tag deployment. Based on a hierarchical clustering of this data, we could identify four principle daily vertical behaviour types, representing surface (≦10m) and subsurface (10–100 m) orientation, moderate (50–200 m) and deep (≧200m) diving behaviour. These vertical behaviour types showed seasonal variations with partly opposing trends in their frequencies. Accordingly, ABFT were more surface orientated during summer, while moderate diving behaviour was more common during winter. Depth time series data further revealed inverted day-night patterns for both of these periods. Tagged ABFT frequented the surface waters more regularly during daytime and deeper waters during the night in summer, while the opposite pattern was found in winter. Seasonal changes in the vertical behaviour of ABFT were accompanied by simultaneous changes in environmental conditions (SST, chla, thermal stratification). Accordingly, surface orientation and moderate diving behaviour appeared to be triggered by the thermal stratification of the water column, though less pronounced than previously reported for ABFT in the North Atlantic, probably indicating adaptive vertical behaviour related to the availability of epipelagic food resources (anchovies and sardines). Deep diving behaviour was particularly frequent during months of high biological productivity (February-May), although one recovered tag showed periodic and unusual long spike dives during summer-autumn, in relation to thermal fronts. Regional effects on the vertical behaviour of ABFT were identified through GAMs, with surface orientation being particularly pronounced in the Gulf of Lions, highlighting its suitability for an ongoing annual aerial survey program to estimate ABFT abundance in this region. In addition, increased levels of mesoscale activity/productivity (e.g. related to oceanic fronts) were detected in an area regularly utilized by ABFT, south of the Gulf of Lions, underlining its attractiveness as foraging ground. Kernel densities of geolocation estimates showed a seasonal shift in the horizontal distribution of ABFT from this “high-use” area towards the Gulf of Lions during summer, probably linked to the enhanced availability of epipelagic food resources at this time.},
author = {Bauer, Robert Klaus and Fromentin, Jean Marc and Demarcq, Herv{\'{e}} and Bonhommeau, Sylvain},
doi = {10.1016/j.dsr2.2017.04.006},
file = {:home/work/Desktop/3paper{\_}tagging{\_}v2{\_}elsevier{\_}for{\_}RG.pdf:pdf},
issn = {09670645},
journal = {Deep-Sea Research Part II: Topical Studies in Oceanography},
keywords = {Archival tags,Fronts,Habitat use,Spike dives,Thermal stratification,Thunnus thynnus},
number = {April 2017},
pages = {248--261},
title = {{Habitat use, vertical and horizontal behaviour of Atlantic bluefin tuna (Thunnus thynnus) in the Northwestern Mediterranean Sea in relation to oceanographic conditions}},
volume = {141},
year = {2017}
}
@article{Morales2020,
abstract = {Marine protected areas (MPAs) are becoming a widely used tool for the conservation of biodiversity and for fishery management; however, most of these areas are designed without prior knowledge of the basic ecological aspects of the species that they are trying to protect. This study investigated the movement of two top predators: the Galapagos shark, Carcharhinus galapagensis, and the yellowtail amberjack, Seriola lalandi, in and around the Motu Motiro Hiva Marine Park (MMHMP) using MiniPAT satellite tags to determine the effectiveness of this MPA for the protection of these species. The Galapagos sharks (n = 4) spent most of their tag deployment periods inside the MMHMP. However, high intraspecific variability was observed in their movement dynamics. Daily individual maximum movements ranged from 17 to 58 km and the maximum distance from Salas y G{\'{o}}mez Island, the only emergent island within the MMHMP, ranged from 31 to 139 km. The maximum linear distance travelled for a female juvenile Galapagos shark (152 cm total length) was 236 km, which is greater than the maximum distance previously documented for juveniles of this species ({\textless}50 km). For the yellowtail amberjack (n = 1), 91{\%} of the satellite geolocations were within the MMHMP, with a maximum daily distance travelled of 6 km. The maximum distance travelled between points was 111 km and the maximum distance from Salas y G{\'{o}}mez Island was 62 km. All archival tagged fish spent most of their time at depths of {\textless}50 m and never left the epipelagic zone. Daytime versus night-time differences were pronounced in all individuals but showed high interindividual variability. This study provides a baseline on the movement of these two top predators in the MMHMP and provides valuable insights for the creation of MPAs in the region and elsewhere.},
author = {Morales, Nait{\'{i}} A. and Heidemeyer, Maike and Bauer, Robert and Hern{\'{a}}ndez, Sebastian and Acu{\~{n}}a, Enzo and Friedlander, Alan M. and Gaymer, Carlos F.},
doi = {10.1002/aqc.3472},
file = {:home/work/Desktop/Sams/Morales{\_}etal{\_}AQC.pdf:pdf},
issn = {10990755},
journal = {Aquatic Conservation: Marine and Freshwater Ecosystems},
keywords = {MPA evaluation,Motu Motiro Hiva Marine Park,fishing pressure,movement patterns,offshore islands,top predators},
number = {August 2019},
pages = {1--16},
title = {{Residential movements of top predators in Chile's most isolated marine protected area: Implications for the conservation of the Galapagos shark, Carcharhinus galapagensis, and the yellowtail amberjack, Seriola lalandi}},
year = {2020}
}
@article{Bauer2020,
abstract = {Atlantic bluefin tuna (Thunnus thynnus) (ABFT) frequently engage in surface basking and foraging behaviour that makes them detectable from afar. This behaviour is utilized for the development of fisheries-independent abundance indices based on aerial surveys, although changes in the surface-feeding dynamics of ABFT are not yet accounted for. We investigated the daytime surfacing behaviour of ABFT at different temporal and vertical resolutions based on 24 individuals (117–158 cm fork length), tagged with pop-up archival tags in the Gulf of Lion, NW-Mediterranean Sea between 2015 and 2016. The results suggest that ABFT remain usually {\textless}2 min continuously within the visible surface (0–1 m) during daytime. ABFT presence in the 0–1 and 0–20 m layers varied over time and between individuals but showed a seasonal decline towards autumn with the breakdown of thermal stratification. Furthermore, the rate of surfacing events was highly correlated with the time spent in the 0–20 m layer. Geolocation estimates confirm a strong site fidelity of ABFT during the aerial survey period (August–October) in the Gulf of Lion. Our results support the choice of the survey region and period, but related indices should account for the seasonality of ABFT surface behaviour [i.e. the time spent in the 0–20 m layer.},
author = {Bauer, Robert Klaus and Forget, Fabien and Fromentin, Jean Marc and Capello, Manuela},
doi = {10.1093/icesjms/fsaa083},
file = {:home/work/MEGA/work/IRD/bluemed{\_}manuscript/Bauer{\_}ICES{\_}2020.pdf:pdf},
issn = {10959289},
journal = {ICES Journal of Marine Science},
keywords = {Abundance index,Archival tags,Surface availability,Thermal stratification,Vertical behaviour},
number = {5},
pages = {1979--1991},
title = {{Surfacing and vertical behaviour of Atlantic bluefin tuna (Thunnus thynnus) in the Mediterranean Sea: implications for aerial surveys}},
volume = {77},
year = {2020}
}
@article{Bauer2015a,
abstract = {Pop-up archival tags (PAT) provide summary and high-resolution time series data at predefined temporal intervals. The limited battery capabilities of PATs often restrict the transmission success and thus temporal coverage of both data products. While summary data are usually less affected by this problem, as a result of its lower size, it might be less informative. We here investigate the accuracy and feasibility of using temperature at depth summary data provided by PATs to describe encountered oceanographic conditions. Interpolated temperature at depth summary data was found to provide accurate estimates of three major thermal water column structure indicators: thermocline depth, stratification and ocean heat content. Such indicators are useful for the interpretation of the tagged animal's horizontal and vertical behaviour. The accuracy of these indicators was found to be particularly sensitive to the number of data points available in the first 100 m, which in turn depends on the vertical behaviour of the tagged animal. Based on our results, we recommend the use of temperature at depth summary data as opposed to temperature time series data for PAT studies; doing so during the tag programming will help to maximize the amount of transmitted time series data for other key data types such as light levels and depth. {\textcopyright} 2015 John Wiley},
author = {Bauer, Robert Klaus and Forget, Fabien and Fromentin, Jean Marc},
doi = {10.1111/fog.12127},
file = {:home/work/Documents/Mendeley Desktop/Bauer, Forget, Fromentin - 2015 - Optimizing PAT data transmission Assessing the accuracy of temperature summary data to estimate enviro.pdf:pdf},
issn = {13652419},
journal = {Fisheries Oceanography},
keywords = {Mixed layer depth,Ocean heat content,PAT-style Depth-Temperature Profiles,Pop-up archival tags,Temperature at depth,Thermal stratification,Thermocline},
number = {6},
pages = {533--539},
title = {{Optimizing PAT data transmission: Assessing the accuracy of temperature summary data to estimate environmental conditions}},
volume = {24},
year = {2015}
}