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- Johannesson, Kerstin, 1955, et al.
(författare)
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Oceanographic barriers to gene flow promote genetic subdivision of the tunicate Ciona intestinalis in a North Sea archipelago
- 2018
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Ingår i: Marine Biology. - : Springer Science and Business Media LLC. - 0025-3162 .- 1432-1793. ; 165:8
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Tidskriftsartikel (refereegranskat)abstract
- Pelagic larval development has the potential to connect populations over large geographic distances and prevent genetic structuring. The solitary tunicate Ciona intestinalis has pelagic eggs and a swimming larval stage lasting for maximum a few days, with the potential for a homogenizing gene flow over relatively large areas. In the eastern North Sea, it is found in a geomorphologically complex archipelago with a mix of fjords and open costal habitats. Here, the coastal waters are also stratified with a marked pycnocline driven by salinity and temperature differences between shallow and deep waters. We investigated the genetic structure of C. intestinalis in this area and compared it with oceanographic barriers to dispersal that would potentially reduce connectivity among local populations. Genetic data from 240 individuals, sampled in 2 shallow, and 4 deep-water sites, showed varying degrees of differentiation among samples (F (ST) = 0.0-0.11). We found no evidence for genetic isolation by distance, but two distant deep-water sites from the open coast were genetically very similar indicating a potential for long-distance gene flow. However, samples from different depths from the same areas were clearly differentiated, and fjord samples were different from open-coast sites. A biophysical model estimating multi-generation, stepping-stone larval connectivity, and empirical data on fjord water mass retention time showed the presence of oceanographic barriers that explained the genetic structure observed. We conclude that the local pattern of oceanographic connectivity will impact on the genetic structure of C. intestinalis in this region.
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| 4. |
- Bergh Johannesson, Kerstin, et al.
(författare)
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Impact of bereavement among relatives in Italy and Sweden after the Linate airplane disaster
- 2006
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Ingår i: International Journal of Disaster Medicine. - : Informa UK Limited. - 1503-1438 .- 1755-4713 .- 1651-3037. ; 4:3, s. 110-117
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Tidskriftsartikel (refereegranskat)abstract
- Objectives Victims of major disasters are at risk for development of posttraumatic stress disorder (PTSD). The aim of this study was to compare two groups of bereaved relatives from Italy and Sweden, and to examine the role of psychosocial support and psychological reactions 18 months after traumatic bereavement. Method 153 bereaved relatives of deceased victims in the Milano/Linate air plane crash were assessed through a questionnaire. Reactions of psychological distress were measured by the Impact of Event Scale-Revised (IES-R). Results In the total group 53, 2 % showed symptoms indicating that they might meet the DSM-IV criteria for PTSD. The frequency was higher among the Italian relatives (58.7%) compared to the Swedish (42, 6 %). Females compared to males showed more signs of posttraumatic reactions in the total population as did spouses and parents within the Italian group. The general health status, measured by subjective evaluation, was significantly affected in both groups as a result of the disaster. A significant recovery after 18 months was reported, although not to the pre-accident level. The Swedish relatives had a pattern of using more psychotherapy compared to the Italians among whom it was more common to use medication both for anxiety and sleeping problems. The need for psychotherapy and medication was related to higher scores on IES-R. Conclusions: (1) Traumatic losses deeply affect bereaved relatives. Health is affected and a large group of these relatives develop strong symptoms of post-traumatic stress. (2) Swedish bereaved relatives seem to be more apt to ask for professional help, e.g. psychotherapy, while in Italy it is more common to rely on family, friends and medication. (3) Acute organized psychosocial support in the aftermath can possibly facilitate for victims to handle a traumatic loss but it does not prevent the development of strong post-traumatic reactions. Future investigations may show how it is possible to optimize the help with more specific interventions of support and treatment.
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| 5. |
- Bergh Johannesson, Kerstin, et al.
(författare)
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Prolonged Grief Among Traumatically Bereaved Relatives Exposed and Not Exposed to a Tsunami
- 2011
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Ingår i: Journal of Traumatic Stress. - : Wiley. - 0894-9867 .- 1573-6598. ; 24:4, s. 456-464
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Tidskriftsartikel (refereegranskat)abstract
- Numerous studies on the mental health consequences of traumatic exposure to a disaster compare those exposed to those not exposed. Relatively few focus on the effect of the death of a close relative caused by the disaster-suffering a traumatic bereavement. This study compared the impact on 345 participants who lost a close relative in the 2004 Indian Ocean tsunami, but who were themselves not present, to 141 who not only lost a relative, but also were themselves exposed to the tsunami. The focus was on psychological distress assessed during the second year after the sudden bereavement. Findings were that exposure to the tsunami was associated with prolonged grief (B = 3.81) and posttraumatic stress reactions (B 665), and doubled the risk for impaired mental health. Loss of children increased the risk for psychological distress (prolonged grief B = 692; The Impact of Event Scale-Revised: B = 610; General Health Questionnaire-12: OR = 2.34). Women had a higher frequency of prolonged grief For men, loss of children presented a higher risk for prolonged grief in relation to other types of bereavement (B = 636 vs. loss of partner). Further long-term follow-up could deepen the understanding of how recovery after traumatic loss is facilitated.
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| 7. |
- Bergh Johannesson, Kerstin, et al.
(författare)
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Svenskarna som överlevde tsunamin mår relativt bra : Uppföljning sex år efter katastrofen 2004
- 2012
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Ingår i: Läkartidningen. - 0023-7205 .- 1652-7518. ; 109:37, s. 1607-1609
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Tidskriftsartikel (refereegranskat)abstract
- Hälsoläget i hela den undersökta populationen av överlevande svenskar sex år efter flodvågskatastrofen 2004 ter sig relativt gott.Jämfört med den förra undersökningen tre år efter tsunamin finns indikationer på en viss fortsatt återhämtning.Kvinnor visar besvär i något större utsträckning än män.En minoritet har fortfarande problem, i synnerhet de som var utsatta för livshot. Fördjupade studier kommer att belysa faktorer av betydelse för olika vägar till återhämtning.
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| 8. |
- Bergh Johannesson, Kerstin, et al.
(författare)
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The effect of Traumatic Bereavement on Tsunami-Exposed Survivors
- 2009
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Ingår i: Journal of Traumatic Stress. - : Wiley. - 0894-9867 .- 1573-6598. ; 22:6, s. 497-504
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Tidskriftsartikel (refereegranskat)abstract
- Fourteen months after the 2004 tsunami, mental health outcome was assessed in 187 bereaved relatives, 308 bereaved friends, and in 3,020 nonbereaved Swedish survivors. Of the bereaved relatives, 41% reported posttraumatic stress reactions and 62% reported impaired general mental health. Having been caught or chased by the tsunami in combination with bereavement was associated with increased posttraumatic stress reactions. Complicated grief reactions among relatives were almost as frequent as posttraumatic stress reactions. The highest levels of psychological distress were found among those who had lost children. Traumatic bereavement, in combination with exposure to life danger, is probably a risk factor for mental health sequelae after a natural disaster.
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| 10. |
- Bergh Johannesson, Kerstin, et al.
(författare)
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Tsunami-exposed tourist survivors : Signs of recovery in an 3-year perspective
- 2011
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Ingår i: Journal of Nervous and Mental Disease. - 0022-3018 .- 1539-736X. ; 199:3, s. 162-169
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Tidskriftsartikel (refereegranskat)abstract
- Long-term follow-up after disaster exposure indicates increased rates of psychological distress. However, trajectories and rates of recovery in large samples of disaster-exposed survivors are largely lacking. A group of 3457 Swedish survivors temporarily on vacation in Southeast Asia during the 2004 tsunami were assessed by postal questionnaire at 14 months and 3 years after the tsunami regarding post-traumatic stress reactions (IES-R) and general mental health (GHQ-12). There was a general pattern of resilience and recovery 3 years postdisaster. Severe exposure and traumatic bereavement were associated with increased post-traumatic stress reactions and heightened risk for impaired mental health. The rate of recovery was lower among respondents exposed to life threat and among bereaved. Severe trauma exposure and bereavement seem to have considerable long-term impact on psychological distress and appear to slow down the recovery process. Readiness among health agencies for identification of symptoms and provision of interventions might facilitate optimal recovery.
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