scholarly journals Interactions between harbour seals (Phoca vitulina) and coastal fisheries along the Swedish west coast: an overview

2010 ◽  
Vol 8 ◽  
pp. 329 ◽  
Author(s):  
Karl Lundström ◽  
Sven-Gunnar Lunneryd ◽  
Sara Königson ◽  
Malin Hemmingsson
Keyword(s):  
West Coast ◽  
Current Data ◽  
Mitigation Measures ◽  
Swedish West Coast ◽  
Coastal Fisheries ◽  
Prey Preferences ◽  
New Information ◽  
Harbour Seals ◽  
By Catch ◽  
Fyke Nets

The conflicts between seals and fisheries along the Swedish west coast have intensified during the last decades, concurrently with the increase in the harbour seal population size. This study presents published information about interactions between harbour seals and fisheries in the Kattegat-Skagerrak, in addition to new information on the seal by-catch rate and an overview of fisheries suffering from seal damage. Several fisheries have reported interactions with seals, principally fisheries with fyke nets, gill nets and static gear. Development of mitigation measures has been focused on the eel fishery with fyke nets, in which the use of stronger net material has significantly decreased the damage frequency from seals and has yet maintained the catches at satisfactory levels. Under-water filming at fyke nets together with studies of the prey preferences of seals has shown individual specializations in certain foraging techniques. For example, eel may not be a common prey for harbour seals in general, but, it was chosen in preference to other species by seals attacking fyke nets. There is a lack of current data concerning the diet of harbour seals. Previous studies, based on material from the 1970s and 1980s, have shown that locally and seasonally abundant prey is preferred. Due to the non-existent information about the foodchoice, current assessments of the ecological role of harbour seals in Sweden cannot be evaluated.

scholarly journals Movements and site fidelity of harbour seals (Phoca vitulina) in Kattegat, Denmark, with implications for the epidemiology of the phocine distemper virus

2012 ◽  
Vol 70 (1) ◽  
pp. 186-195 ◽  
Author(s):  
Rune Dietz ◽  
Jonas Teilmann ◽  
Signe M. Andersen ◽  
Frank Rigét ◽  
Morten T. Olsen
Keyword(s):  
Gene Flow ◽  
Home Range ◽  
West Coast ◽  
Site Fidelity ◽  
Phoca Vitulina ◽  
Swedish West Coast ◽  
Phocine Distemper Virus ◽  
Harbour Seals ◽  
Limited Gene Flow ◽  
Satellite Tagging

Abstract Dietz, R., Teilmann, J., Andersen S. M. Rigét, F., and Olsen, M. T. 2013. Movements and site fidelity of harbour seals (Phoca vitulina) in Kattegat, Denmark, with implications for the epidemiology of the phocine distemper virus. – ICES Journal of Marine Science, 70:186–195. Twenty-seven harbour seals were caught and tagged at the island of Anholt in central Kattegat, Denmark, the epicentre of the phocine distemper virus (PDV) outbreaks in 1988 and 2002 that killed 50–60% of the populations. The satellite tagging shows that harbour seals from Anholt moved widely across Kattegat with a maximum distance of 249 km from the tagging haul-out site. Overall, females travelled over a wider area compared with males [90% kernel home range (KHR) females, 5189 km2; males, 3293 km2). KHR calculated for yearlings (6414 km2) is larger than for subadults (2534 km2), which again is larger than for adult seals (1713 km2), showing a strong site fidelity, indicating limited gene flow between haul-out sites. Distances moved and home range sizes increased across autumn, peaked in February–March, and decreased through spring. During the breeding season in spring, all seals were very stationary around Anholt. The onset of the PDV epizootics in 1988 and 2002 took place when the Anholt harbour seals congregate on the Island during April. Anholt seal were also documented to have contact with infected seal locations at Hesselø, Læsø, and the Swedish west coast, although this contact takes place during winter prior to the documented summer outbreaks.

THE ‘SOS’ AMPHORA: AN UPDATE

2015 ◽  
Vol 110 ◽  
pp. 213-245
Author(s):  
Catherine E. Pratt
Keyword(s):  
Iron Age ◽  
Mediterranean Basin ◽  
Current Data ◽  
Archaic Period ◽  
Early Iron Age ◽  
New Information ◽  
Production And Distribution ◽  
The Mediterranean ◽  
New Distribution ◽  
The Mediterranean Basin

Research conducted and published over the last 35 years has brought to light much new information concerning the so-called ‘SOS’ amphora, produced primarily in Attica and Euboea in the Archaic period. However, little focused work has been undertaken in the study of these vessels since Johnston and Jones' seminal work in 1978. This paper therefore provides a critical update on the production and distribution of SOS amphorae using the current data available. Included in this update is a discussion of recent research on Early Iron Age amphorae that may help situate the SOS amphora within a broader ceramic milieu. A new distribution of SOS amphorae also necessitates a reappraisal of some previously held ideas concerning their chronological patterns and the specific actors involved in their shipment. Taking into consideration the multiple spatial and temporal varieties of SOS amphorae, it can be shown that these vessels were relatively evenly deposited across the Mediterranean, from Iberia to the Levant, very early in the Archaic period. In combination with other factors, this widespread distribution may support the hypothesis that non-Greek seafarers were involved with transporting Athenian and Euboean SOS amphorae. Ultimately, it is hoped that a fresh look at this ceramic shape, however brief, might contribute to existing scholarly debates on cultural interactions and mobility within the Mediterranean basin during the Archaic period.

Measured fluxes of sulphur, chlorine and some anthropogenic metals to the Swedish west coast

1994 ◽  
Vol 25 (4) ◽  
pp. 733
Author(s):  
V.L. Foltescu ◽  
J. Isakson ◽  
E. Selin ◽  
M. Stikans
Keyword(s):  
West Coast ◽  
Swedish West Coast

Dynamic updating of post-earthquake damage and functional restoration forecasts of water distribution systems using Bayesian inferencing

2021 ◽  
pp. 875529302110380
Author(s):  
Agam Tomar ◽  
Henry V Burton ◽  
Ali Mosleh
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Water Distribution ◽  
Epistemic Uncertainty ◽  
Discrete Event ◽  
Complete Recovery ◽  
Current Data ◽  
Functional Restoration ◽  
Mitigation Measures ◽  
Total Recovery

A framework for dynamically updating post-earthquake functional recovery forecasts is presented to reduce the epistemic uncertainty in the predictive model. A Bayesian Network (BN) model is used to provide estimates of the total recovery time, and a process-based discrete event simulation (PBDES) model generates forecasts of the complete recovery trajectory. Both models rely on component damage and duration-based input parameters that are dynamically updated using Bayes’ theorem, as information becomes available throughout the recovery process. The effectiveness of the proposed framework is demonstrated through an application to the pipe network of the City of Napa water distribution system. More specifically, pipe damage and repair data from the 2014 earthquake are used as a point of comparison for the dynamic forecasts. It is shown that, over time, the mean value of the total recovery duration generated by the BN-based model converges to the observed value and the dispersion is reduced. Also, despite a crude initial estimate, the median trajectory generated by the PBDES model provides a reasonable approximation of the observed recovery within 30 days following the earthquake. The proposed framework can be used by emergency managers to investigate the efficacy of post-event mitigation measures (e.g. crew allocation, resource prioritization) utilizing the most current data and knowledge.

scholarly journals Using Incentives to Reduce Bycatch and Discarding: Results Under the West Coast Catch Share Program

2019 ◽  
Author(s):  
Lisa Pfeiffer
Keyword(s):  
West Coast ◽  
Bottom Trawl ◽  
The West ◽  
Annual Variability ◽  
Environmental Objectives ◽  
By Catch ◽  
Groundfish Fishery ◽  
Dover Sole ◽  
Ecosystem Benefits ◽  
Over Time

Catch share management was implemented in the bottom trawl sector of the West Coast Groundfish fishery in 2011 to address a range of issues including high bycatch and discard rates. The catch share programwas designed to remove the incentives to discard through full catch accounting, tradeable quotas, increased flexibility in fishing, and penalties for catch overages. We assess the effectiveness of the program in meeting its environmental objectives by comparing discard weights, proportions, and variability from 2004–2010 with 2011–2016. We analyzed these metrics for species managed using quota, including historically overfished stocks, as well as for non-quota species caught in the fishery. Discard amounts decreased over time for all species and declined to historic lows after the implementation of the program, remaining low through 2016 with much less inter-annual variability. Mean annual discards of two highly-targeted quota species, sablefishand Dover sole, showed the greatest decreases, falling by 97 and 86%, respectively. The discard proportion of overfished quota species fell by 50% on average. The unanticipated decline in discards of non-quotaspecies as well as the decreased variability in discard amounts for all species indicate that the incentives produced by catch share management provided additional ecosystem benefits.

scholarly journals On the progression of COVID19 in Portugal: A comparative analysis of active cases using non-linear regression

2020 ◽  
Author(s):  
Ana Milhinhos ◽  
Pedro M. Costa
Keyword(s):  
Linear Regression ◽  
Current Data ◽  
Mitigation Measures ◽  
Infected People ◽  
Successful Case ◽  
Non Linear ◽  
Containment Measures ◽  
In The Beginning ◽  
European Union Member States ◽  
Very High

Portugal has been portrayed as a relatively successful case in the control of the COVID-19's March 2020 outbreak in Europe due to the timely confinement measures taken. As other European Union member states, Portugal is now preparing the phased loosening of the confinement measures, starting in the beginning of May. Even so, the current data, albeit showing at least a reduction in infection rates, renders difficult to forecast scenarios in the imminent future. Using South Korea data as scaffold, which is becoming a paradigmatic case of recovery following a high number of infected people, we fitted Portuguese data to biphasic models using non-linear regression and compared the two countries. The results, which suggest good fit, show that recovery in Portugal can be much slower than anticipated, with a very high percentage of active cases (over 50%) remaining still active even months after the projected end of mitigation measures. This, together with the unknown number of asymptomatic carriers, may increase the risk of a much slower recovery if not of new outbreaks. Europe and elsewhere must consider this contingency when planning the relief of containment measures.

Sign in / Sign up

Export Citation Format

Share Document