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Author |
Van Hanja J |
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Master 1 |
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Year |
2021 |
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10 pp |
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1044 |
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yes |
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8062 |
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Journal |
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Year |
2021 |
Publication |
Marine pollution bulletin |
Abbreviated Journal |
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Volume |
169 |
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Pages |
112559 |
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Keywords |
At-sea survey Frontal system Garbage patch Plastic litter Southern Indian Ocean |
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109 |
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Bachelor's thesis |
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0025-326X |
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yes |
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7939 |
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Author |
Pamela E. Michael, Chris Wilcox, Christophe Barbraud, Karine Delord, Michael Sumner, Henri Weimerskirch |
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Title |
Dynamic enforcement of bycatch via reproductive value can increase theoretical efficiency |
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Journal |
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Year |
2021 |
Publication |
Marine Policy |
Abbreviated Journal |
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Volume |
132 |
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Pages |
104684 |
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Keywords |
Albatross Bycatch Dynamic enforcement Dynamic ocean management Monitoring Reproductive value |
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Abstract |
Managing marine systems is challenging, as many marine species are highly mobile. Albatross exemplify this paradigm, overlapping multiple threats at sea, including bycatch. The typical characterization of bycatch, the number of individuals, ignores the long-term, population-wide repercussions of bycatch. Including an estimate of the reproductive value (RV, the loss of future reproductive contributions, given bycatch) is a complementary tool, incorporating the population-wide repercussions of bycatch. While bycatch management via dynamic spatial management allows management boundaries to move, it requires monitoring and enforcement to be effective. We provide a proof of concept to optimize bycatch enforcement activities by dynamically targeting areas of concentrated future productivity characterized by RV. This paper examined a population of black-browed albatross (Thalassarche melanophris) as a case study. We calculate RV and apply it to at-sea distributions. This creates spatiotemporally explicit surfaces used to prioritize times and locations for bycatch mitigation enforcement. Dynamic enforcement has greater theoretical efficiency than static enforcement, but this difference decreases with increasing population-wide RV subject to enforcement. Though there are implementation challenges, many can be reduced with existing tools providing various opportunities. Incorporating RV when characterizing the impacts of bycatch on a population and strategically applying dynamic bycatch enforcement based on RV can be a powerful, efficient component of dynamic ocean management. |
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109 |
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0308-597X |
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0308-597X |
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yes |
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8342 |
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Title |
Molecular response of a sub-antarctic population of the blue mussel (Mytilus edulis platensis) to a moderate thermal stress |
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Journal |
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Year |
2021 |
Publication |
Marine Environmental Research |
Abbreviated Journal |
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Volume |
169 |
Issue |
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Pages |
105393 |
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Keywords |
2DE Abiotic stress Biomonitoring Gills Indicator species Kerguelen island Mytilus sp. qRT-PCR Temperature |
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Abstract |
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409 |
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ISSN |
0141-1136 |
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yes |
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8256 |
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Title |
Differences in foraging habitat result in contrasting fisheries interactions in two albatross populations |
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Journal |
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Year |
2021 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
663 |
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Pages |
197-208 |
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Keywords |
Boat attraction Crozet Diomedea exulans Fisheries Fisheries discards Kerguelen |
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Abstract |
Albatrosses attend fishing boats to feed on fishing discards but are often at risk of accidental bycatch. To examine whether populations (same species) and sexes differ in their overlap with fisheries due to differences in habitat use, we combined the use of recently developed loggers equipped with GPS and boat radar detectors with Automatic Identification System (AIS) data. Our study indicates that incubating wandering albatrosses Diomedea exulans from Crozet and Kerguelen foraged in different habitats although the duration of trips was similar. Both female and male Kerguelen birds took advantage of the large and productive surrounding shelf, whereas Crozet birds used the small shelf around the islands to a lesser extent. In Crozet, there was segregation between males and females, the latter favouring deeper and warmer waters. The 2 strategies of habitat use led to different overlap and attraction to boats, with Kerguelen birds encountering and attending boats for longer and at closer proximity to the colony than Crozet birds. Crozet females encountered boats at greater distances from the colony than males. Because of their different habitat use and foraging outside exclusive economic zones (EEZ) and further from the colony, Crozet birds attended more non-declared boats (without AIS) than Kerguelen birds. Albatrosses were more attracted by fisheries than cargo vessels and were especially attracted by fishing discards that led them to attend vessels for longer periods for both sexes and populations. The differences found between populations and individuals in terms of habitat specialization and encounter rate of fisheries should be considered for future assessments of risk of bycatch. |
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109 |
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ISSN |
0171-8630, 1616-1599 |
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yes |
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Call Number |
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Serial |
7940 |
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| Permanent link to this record |
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Author |
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Title |
Inter-annual variation in winter distribution affects individual seabird contamination with mercury |
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Journal |
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Year |
2021 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
676 |
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Pages |
243-254 |
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Keywords |
Biologging Feathers Migration North Atlantic-Arctic Pollutant |
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388 |
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0171-8630, 1616-1599 |
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yes |
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Call Number |
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Serial |
7978 |
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Title |
Long-term tracking of an Arctic-breeding seabird indicates high fidelity for pelagic wintering areas |
Type |
Journal |
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Year |
2021 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Abstract |
Site fidelity is driven by predictable resource distributions in time and space. However, intrinsic factors related to an individual’s physiology and life-history traits can contribute to consistent foraging behaviour and movement patterns. Using 11 years of continuous geolocation tracking data (fall 2008 to spring 2019), we investigated spatiotemporal consistency in non-breeding movements in a pelagic seabird population of black-legged kittiwakes (Rissa tridactyla) breeding in the High Arctic (Svalbard). Our objective was to assess the relative importance of spatial versus temporal repeatability behind inter-annual movement consistency during winter. Most kittiwakes used pelagic regions of the western North Atlantic. Winter site fidelity was high both within and across individuals and at meso (100-1000 km) and macro scales (>1000 km). Spatial consistency in non-breeding movement was higher within than among individuals, suggesting that site fidelity might emerge from individuals’ memory to return to locations with predictable resource availability. Consistency was also stronger in space than in time, suggesting that it was driven by consistent resource pulses that may vary in time more so than in space. Nonetheless, some individuals displayed more flexibility by adopting a strategy of itinerancy during winter, and the causes of this flexibility are unclear. Specialization for key wintering areas can indicate vulnerability to environmental perturbations, with winter survival and carry-over effects arising from winter conditions as potential drivers of population dynamics |
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330 |
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0171-8630, 1616-1599 |
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yes |
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Call Number |
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7988 |
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Title |
Strong migratory connectivity across meta-populations of sympatric North Atlantic seabirds |
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Journal |
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Year |
2021 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
SEA |
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Keywords |
Environmental niche Inter-population mixing Large-scale spatiotemporal dynamics Light-level geolocation Murres Population spread Seasonality |
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388 |
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0171-8630, 1616-1599 |
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yes |
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8027 |
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Title |
Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach |
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Journal |
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Year |
2021 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
668 |
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Pages |
149-161 |
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Keywords |
Bioenergetic model Depredation Dissostichus eleginoides Ecosystem-based management Fisheries interaction Marine mammals Orcinus orca Top predator conservation |
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Abstract |
Fisheries modify prey availability for marine predators by extracting resources but also by providing them with new feeding opportunities. Among these, depredation, which occurs when predators feed on fish caught on fishing gear, is a behavior developed by many species as a way to acquire food through limited foraging effort. However, the extent to which depredated resources from fisheries contribute to the energetic requirements and affect the demography of depredating individuals is unknown. We investigated the contribution of Patagonian toothfish Dissostichus eleginoides depredated on longlines to the energetic requirements of killer whales Orcinus orca around the Crozet Islands (southern Indian Ocean) over the period 2007-2018. Our results indicate that during days when depredation occurred, depredating individuals fulfilled on average 94.1% of their daily energetic requirements with depredated toothfish. However, the contribution varied from 1.2 to 13.3% of the monthly energetic requirements and from 2.4 to 8.8% of the yearly energetic requirements of the total population. Together, these findings suggest that intake of depredated toothfish can be substantial at a fine scale (daily and individually), potentially leading to temporary provisioning effects and changes in predation pressures. These effects become minor (<10%), however, when considering the full population over a whole year. The contribution of depredated fish to the annual energetic requirements of the population has increased in recent years, likely due to larger fishing quotas and greater opportunities for whales to depredate, which stresses the importance of accounting for depredation in ecosystem-based management of fishing activity. |
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109 |
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0171-8630, 1616-1599 |
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yes |
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8335 |
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Title |
Sharing wintering grounds does not synchronize annual survival in a high Arctic seabird, the little auk |
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Journal |
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Year |
2021 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
676 |
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Pages |
233-242 |
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Keywords |
Alle alle Capture-mark-recapture Geolocator Migration Non-breeding distribution Synchrony |
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Abstract |
Sharing the same wintering grounds by avian populations breeding in various areas may synchronize fluctuations in vital rates, which could increase the risk of extinction. Here, by combining multi-colony tracking with long-term capture-recapture data, we studied the winter distribution and annual survival of the most numerous Arctic seabird, the little auk Alle alle. We assessed whether little auks from different breeding populations in Svalbard and Franz Josef Land use the same wintering grounds and if this leads to synchronized survival. Our results indicate that birds from the Svalbard colonies shared similar wintering grounds, although differences existed in the proportion of birds from each colony using the different areas. Little auks from Franz Josef Land generally spent the winter in a separate area, but some individuals wintered in the Iceland Sea with Svalbard populations. Survival data from 3 Svalbard colonies collected in 2005-2018 indicated that sharing wintering grounds did not synchronize little auk annual survival rates. However, it is clear that the Iceland Sea is an important wintering area for little auks, and environmental changes in this area could have widespread impacts on many populations. |
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388 |
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0171-8630, 1616-1599 |
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yes |
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8419 |
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