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Author Zaba, M.; Kirmeier, T.; Ionescu, I.A.; Wollweber, B.; Buell, D.R.; Gall-Kleebach, D.J.; Schubert, C.F.; Novak, B.; Huber, C.; Kohler, K.; Holsboer, F.; Putz, B.; Muller-Myhsok, B.; Hohne, N.; Uhr, M.; Ising, M.; Herrmann, L.; Schmidt, U. url  doi
openurl 
  Title Identification and characterization of HPA-axis reactivity endophenotypes in a cohort of female PTSD patients Type Journal Article
  Year 2015 Publication Psychoneuroendocrinology Abbreviated Journal Psychoneuroendocrinology  
  Volume 55 Issue Pages 102-115  
  Keywords Fkbp5; Gene expression; Ptsd; PTSD subtypes; Posttraumatic stress disorder; Stress reactivity; Trier Social Stress Test  
  Abstract Analysis of the function of the hypothalamic-pituitary-adrenal (HPA)-axis in patients suffering from posttraumatic stress disorder (PTSD) has hitherto produced inconsistent findings, inter alia in the Trier Social Stress Test (TSST). To address these inconsistencies, we compared a sample of 23 female PTSD patients with either early life trauma (ELT) or adult trauma (AT) or combined ELT and AT to 18 age-matched non-traumatized female healthy controls in the TSST which was preceded by intensive baseline assessments. During the TSST, we determined a variety of clinical, psychological, endocrine and cardiovascular parameters as well as expression levels of four HPA-axis related genes. Using a previously reported definition of HPA-axis responsive versus non-responsive phenotypes, we identified for the first time two clinically and biologically distinct HPA-axis reactivity subgroups of PTSD. One subgroup (“non-responders”) showed a blunted HPA-axis response and distinct clinical and biological characteristics such as a higher prevalence of trauma-related dissociative symptoms and of combined AT and ELT as well as alterations in the expression kinetics of the genes encoding for the mineralocorticoid receptor (MR) and for FK506 binding protein 51 (FKBP51). Interestingly, this non-responder subgroup largely drove the relatively diminished HPA axis response of the total cohort of PTSD patients. These findings are limited by the facts that the majority of patients was medicated, by the lack of traumatized controls and by the relatively small sample size. The here for the first time identified and characterized HPA-axis reactivity endophenotypes offer an explanation for the inconsistent reports on HPA-axis function in PTSD and, moreover, suggest that most likely other factors than HPA-axis reactivity play a decisive role in determination of PTSD core symptom severity.  
  Address Max Planck Institute of Psychiatry, Clinical Department, Kraepelinstrasse 10, 80804 Munchen, Germany. Electronic address: uschmidt@mpipsykl.mpg.de  
  Corporate Author Thesis  
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  Language English Summary Language Original Title  
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  Series Volume Series Issue Edition  
  ISSN 0306-4530 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:25745955 Approved no  
  Call Number UU @ jana.mullerova @ Serial 42193  
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Author Chalavi, S.; Vissia, E.M.; Giesen, M.E.; Nijenhuis, E.R.S.; Draijer, N.; Barker, G.J.; Veltman, D.J.; Reinders, A.A.T.S. url  doi
openurl 
  Title Similar cortical but not subcortical gray matter abnormalities in women with posttraumatic stress disorder with versus without dissociative identity disorder Type Journal Article
  Year 2015 Publication Psychiatry Research Abbreviated Journal Psychiatry Res  
  Volume 231 Issue 3 Pages 308-319  
  Keywords Adolescent; Adult; Cerebral Cortex/*pathology; Comorbidity; Corpus Striatum/*pathology; Female; Gray Matter/*pathology; Hippocampus/pathology; Humans; *Life Change Events; Magnetic Resonance Imaging; Middle Aged; Multiple Personality Disorder/epidemiology/*pathology; Stress Disorders, Post-Traumatic/epidemiology/*pathology; Young Adult; Cortical surface area; Cortical thickness; Cortical volume; FreeSurfer; Neuroimaging; Subcortical volume  
  Abstract Neuroanatomical evidence on the relationship between posttraumatic stress disorder (PTSD) and dissociative disorders is still lacking. We acquired brain structural magnetic resonance imaging (MRI) scans from 17 patients with dissociative identity disorder (DID) and co-morbid PTSD (DID-PTSD) and 16 patients with PTSD but without DID (PTSD-only), and 32 healthy controls (HC), and compared their whole-brain cortical and subcortical gray matter (GM) morphological measurements. Associations between GM measurements and severity of dissociative and depersonalization/derealization symptoms or lifetime traumatizing events were evaluated in the patient groups. DID-PTSD and PTSD-only patients, compared with HC, had similarly smaller cortical GM volumes of the whole brain and of frontal, temporal and insular cortices. DID-PTSD patients additionally showed smaller hippocampal and larger pallidum volumes relative to HC, and larger putamen and pallidum volumes relative to PTSD-only. Severity of lifetime traumatizing events and volume of the hippocampus were negatively correlated. Severity of dissociative and depersonalization/derealization symptoms correlated positively with volume of the putamen and pallidum, and negatively with volume of the inferior parietal cortex. Shared abnormal brain structures in DID-PTSD and PTSD-only, small hippocampal volume in DID-PTSD, more severe lifetime traumatizing events in DID-PTSD compared with PTSD-only, and negative correlations between lifetime traumatizing events and hippocampal volume suggest a trauma-related etiology for DID. Our results provide neurobiological evidence for the side-by-side nosological classification of PTSD and DID in the DSM-5.  
  Address Department of Neuroscience, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands; Department of Psychosis Studies, Institute of Psychiatry (IoP), Kings College London, De Crespigny Park, P.O. Box 40, London SE5 8AF, United Kingdom. Electronic address: a.a.t.s.reinders@gmail.com  
  Corporate Author Thesis  
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  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title (up)  
  Series Volume Series Issue Edition  
  ISSN 0165-1781 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:25670646 Approved no  
  Call Number UU @ jana.mullerova @ Serial 42194  
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Author Tursich, M.; Ros, T.; Frewen, P.A.; Kluetsch, R.C.; Calhoun, V.D.; Lanius, R.A. url  doi
openurl 
  Title Distinct intrinsic network connectivity patterns of post-traumatic stress disorder symptom clusters Type Journal Article
  Year 2015 Publication Acta Psychiatrica Scandinavica Abbreviated Journal Acta Psychiatr Scand  
  Volume 132 Issue 1 Pages 29-38  
  Keywords adult survivors of child abuse; functional neuroimaging; multivariate analysis; post-traumatic stress disorders  
  Abstract OBJECTIVE: Post-traumatic stress disorder (PTSD) is considered a multidimensional disorder, with distinct symptom clusters including re-experiencing, avoidance/numbing, hyperarousal, and most recently depersonalization/derealization. However, the extent of differing intrinsic network connectivity underlying these symptoms has not been fully investigated. We therefore investigated the degree of association between resting connectivity of the salience (SN), default mode (DMN), and central executive (CEN) networks and PTSD symptom severity. METHOD: Using resting-state functional MRI data from PTSD participants (n = 21), we conducted multivariate analyses to test whether connectivity of extracted independent components varied as a function of re-experiencing, avoidance/numbing, hyperarousal, and depersonalization/derealization. RESULTS: Hyperarousal symptoms were associated with reduced connectivity of posterior insula/superior temporal gyrus within SN [peak Montreal Neurological Institute (MNI): -44, -8, 0, t = -4.2512, k = 40]. Depersonalization/derealization severity was associated with decreased connectivity of perigenual anterior cingulate/ventromedial prefrontal cortex within ventral anterior DMN (peak MNI: 8, 40, -4; t = -3.8501; k = 15) and altered synchrony between two DMN components and between DMN and CEN. CONCLUSION: Our results are consistent with prior research showing intrinsic network disruptions in PTSD and imply heterogeneous connectivity patterns underlying PTSD symptom dimensions. These findings suggest possible biomarkers for PTSD and its dissociative subtype.  
  Address Department of Neuroscience, The University of Western Ontario, London, ON, Canada  
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  Series Volume Series Issue Edition  
  ISSN 0001-690X ISBN Medium  
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  Notes PMID:25572430 Approved no  
  Call Number UU @ jana.mullerova @ Serial 42195  
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Author Armour, C.; Hansen, M. url  doi
openurl 
  Title Assessing DSM-5 latent subtypes of acute stress disorder dissociative or intrusive? Type Journal Article
  Year 2015 Publication Psychiatry Research Abbreviated Journal Psychiatry Res  
  Volume 225 Issue 3 Pages 476-483  
  Keywords Adult; Age Factors; *Diagnostic and Statistical Manual of Mental Disorders; Dissociative Disorders/classification/*diagnosis/psychology; Female; Humans; Male; Middle Aged; Risk Factors; Social Support; Stress Disorders, Traumatic, Acute/classification/*diagnosis/psychology; ASD subtypes; Dissociative ASD; Intrusive ASD; Latent profile analysis; Risk factors  
  Abstract Acute Stress Disorder (ASD) was first included in the DSM-IV in 1994. It was proposed to account for traumatic responding in the early post trauma phase and to act as an identifier for later Posttraumatic Stress Disorder (PTSD). Unlike PTSD it included a number of dissociative indicators. The revised DSM-5 PTSD criterion included a dissociative-PTSD subtype. The current study assessed if a dissociative-ASD subtype may be present for DSM-5 ASD. Moreover, we assessed if a number of risk factors resulted in an increased probability of membership in symptomatic compared to a baseline ASD profile. We used data from 450 bank robbery victims. Latent profile analysis (LPA) was used to uncover latent profiles of ASD. Multinomial logistic regression was used to determine if female gender, age, social support, peritraumatic panic, somatization, and number of trauma exposures increased or decreased the probability of profile membership. Four latent profiles were uncovered and included an intrusion rather than dissociative subtype. Increased age and social support decreased the probability of individuals being grouped into the intrusion subtype whereas increased peritraumatic panic and somatization increased the probability of individuals being grouped into the intrusion subtype. Findings are discussed in regard to the ICD-11 and the DSM-5.  
  Address National Centre for Psychotraumatology, Institute for Psychology, University of Southern Denmark, Denmark  
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  Language English Summary Language Original Title  
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  Series Volume Series Issue Edition  
  ISSN 0165-1781 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:25535010 Approved no  
  Call Number UU @ jana.mullerova @ Serial 42196  
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Author Nash, W.P.; Boasso, A.M.; Steenkamp, M.M.; Larson, J.L.; Lubin, R.E.; Litz, B.T. url  doi
openurl 
  Title Posttraumatic stress in deployed Marines: prospective trajectories of early adaptation Type Journal Article
  Year 2015 Publication Journal of Abnormal Psychology Abbreviated Journal J Abnorm Psychol  
  Volume 124 Issue 1 Pages 155-171  
  Keywords  
  Abstract We examined the course of PTSD symptoms in a cohort of U.S. Marines (N = 867) recruited for the Marine Resiliency Study (MRS) from a single infantry battalion that deployed as a unit for 7 months to Afghanistan during the peak of conflict there. Data were collected via structured interviews and self-report questionnaires 1 month prior to deployment and again at 1, 5, and 8 months postdeployment. Second-order growth mixture modeling was used to disaggregate symptom trajectories; multinomial logistic regression and relative weights analysis were used to assess the role of combat exposure, prior life span trauma, social support, peritraumatic dissociation, and avoidant coping as predictors of trajectory membership. Three trajectories best fit the data: a low-stable symptom course (79%), a new-onset PTSD symptoms course (13%), and a preexisting PTSD symptoms course (8%). Comparison in a separate MRS cohort with lower levels of combat exposure yielded similar results, except for the absence of a new-onset trajectory. In the main cohort, the modal trajectory was a low-stable symptoms course that included a small but clinically meaningful increase in symptoms from predeployment to 1 month postdeployment. We found no trajectory of recovery from more severe symptoms in either cohort, suggesting that the relative change in symptoms from predeployment to 1 month postdeployment might provide the best indicator of first-year course. The best predictors of trajectory membership were peritraumatic dissociation and avoidant coping, suggesting that changes in cognition, perception, and behavior following trauma might be particularly useful indicators of first-year outcomes.  
  Address VA Boston Healthcare System  
  Corporate Author Thesis  
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  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title (up)  
  Series Volume Series Issue Edition  
  ISSN 0021-843X ISBN Medium  
  Area Expedition Conference  
  Notes PMID:25419860 Approved no  
  Call Number UU @ jana.mullerova @ Serial 42197  
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Author Auxemery, Y. url  doi
openurl 
  Title [Clinical forms of post-traumatic depression] Type Journal Article
  Year 2015 Publication L'Encephale Abbreviated Journal Encephale  
  Volume 41 Issue 4 Pages 346-354  
  Keywords Deuil post-traumatique; Deuil traumatique; Depression masquee; Depression post-traumatique; Depression traumatique; Post-concussive syndrome; Posttraumatic depression; Posttraumatic grief; Psychic trauma; Psychopathologie; Psychopathology; Psychopharmacologie; Psychopharmacology; Syndrome post-commotionnel; Traumatic depression; Traumatic grief; Traumatisme psychique  
  Abstract INTRODUCTION: As a result of determinants specific to the psychopathological structure of the psychological trauma, psycho-traumatised patients very rarely solicit the health care system directly with a request for treatment centred on their trauma. The medical profession is consulted for non-specific symptoms and complications, which are mainly somatoform, addictions and depressive disorders. After a few epidemiological reminders followed by a discussion concerning contemporary depressive and post-traumatic nosographic features, we define, through our clinical experience collated with the data in the literature, different clinical and etiopathogenic contexts of post-traumatic depression in order to control their therapeutic treatment. CLINICAL FINDINGS: Burnout post-traumatic depression in response to re-experiencing is the most common: it is a reactive psycho-physiological burnout in response to the emotional distress re-experienced during flashbacks, insomnia, a constant feeling of insecurity and the deleterious consequences of this symptomatology in terms of social adaptation. A common genetic predisposition affecting serotoninergic regulation seems to be a vulnerability marker of both depressive and psychotraumatic symptoms. In this case, SSRI will be effective on sadness. In addition, these antidepressants have been widely prescribed for the first-line treatment of depressive and psychotraumatic symptoms. However, this pharmacological class is often insufficient in relieving autonomic hyperactivity such as re-experiencing which are mediated more by noradrenergic hyperactivity. SNRI such as venlafaxine can be used as a first-line treatment. Post-traumatic depression with psychotic features congruent with mood is dominated by a feeling of incurability; the subject blames himself and feels guilty about the traumatic event and its consequences. Symptoms of denial of identity are sometimes observed: confined by an intense depersonalization, the psycho-traumatised subject evokes that he is “no longer himself” and that his mind “is disconnected”. Confronted with the psychological emptiness of the traumatic scene, the psycho-traumatised subject remains devoid of thought as if their mind has left him. In addition to antidepressant therapy, an atypical antipsychotic drug must be prescribed to relieve the melancholic symptoms as well as the concomitant psychotraumatic symptoms. Post-traumatic depression masked by peripheral physical injuries is the result of accidents combining psychological and physical impairment. The physical pain resulting from the accident regularly recalls the drama in the same way as traumatic re-experiencing. Depression masked by this somatic suffering is difficult to diagnose, but the repeated somatic complaints at the forefront of the request for treatment, the breakdown of self-esteem as well as the level of subjective strain due to pain and dysesthesia are all indications. The psychotherapy will focus on the symbolic reconstruction of the organs that have been damaged or destroyed, with the aim of healing the extensive narcissistic impairment. Post-concussive depression is diagnosed following a head trauma, however severe. It is sometimes assigned to neurological lesions and at other times recognised as the expression of a purely psychological reaction. Antidepressant therapy, or possibly trial therapy, is often indicated. The terms traumatic grief and post-traumatic grief are often used synonymously in publications: a conceptual opposition must however been recalled. If the traumatic grief is the result of the loss of an object that holds much psychological importance for the individual, the subject has not however been traumatised by this event and is not suffering and will not suffer from re-experiencing. The therapy will include methods used in the psychotherapeutic treatment of grief; antidepressants are often insufficient. Differently, post-traumatic grief takes shape when the loss of another is concomitant with the confrontation with the reality of the death witnessed in a moment of peri-traumatic dissociation. This grief is often observed following the discovery of the body of a close friend or family member who has committed suicide, or when part of a family has been decimated by an accident whilst the survivors watch their close relations die pending the arrival of the emergency services, or when a military comrade is wounded in combat in front of his partner. The mourning process cannot really begin until the flashbacks cease. CONCLUSIONS: Clinical depression or even melancholia, possibly masked by somatic or post-concussive complaints, is often the initial mode of contact with the health care system for the psycho-traumatised subject. The different clinical and etiopathogenic contexts of post-traumatic depression that we have developed in this work use specific therapies which need to be clarified by further research based on this nosography.  
  Address Service medical de psychologie clinique appliquee a l'aeronautique, hopital d'instruction des Armees Percy, 101, avenue Henri-Barbusse, BP406, 92141 Clamart, France. Electronic address: yann.auxemery@hotmail.fr  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language French Summary Language Original Title Formes cliniques des depressions post-traumatiques  
  Series Editor Series Title Abbreviated Series Title (up)  
  Series Volume Series Issue Edition  
  ISSN 0013-7006 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:25238908 Approved no  
  Call Number UU @ jana.mullerova @ Serial 42198  
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Author Dorahy, M.J.; van der Hart, O. url  doi
openurl 
  Title DSM-5's posttraumatic stress disorder with dissociative symptoms: challenges and future directions Type Journal Article
  Year 2015 Publication Journal of Trauma & Dissociation : the Official Journal of the International Society for the Study of Dissociation (ISSD) Abbreviated Journal J Trauma Dissociation  
  Volume 16 Issue 1 Pages 7-28  
  Keywords *Diagnostic and Statistical Manual of Mental Disorders; Dissociative Disorders/*classification; Humans; Stress Disorders, Post-Traumatic/*classification; Terminology as Topic; dissociation; dissociative subtype of posttraumatic stress disorder; positive and negative dissociative symptoms; posttraumatic stress disorder  
  Abstract The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, formally recognizes a dissociative subtype of posttraumatic stress disorder (PTSD; PTSD with dissociative symptoms). This nomenclative move will boost empirical and theoretical efforts to further understand the links between dissociation, trauma, and PTSD. This article examines the empirical literature showing that patients with PTSD can be divided into 2 different groups based on their neurobiology, psychological symptom profile, history of exposure to early relational trauma, and depersonalization/derealization symptoms. It then explores the conceptual and empirical challenges of conceiving 1 of these types as reflecting a “dissociative” type of PTSD. First, this classification is based on the presence of a limited subset of dissociative symptoms (i.e., depersonalization, derealization). This sets aside an array of positive and negative psychoform and somatoform dissociative symptoms that may be related to PTSD. Second, empirical evidence suggests heightened dissociation in PTSD compared to many other disorders, indicating that dissociation is relevant to PTSD more broadly rather than simply to the so-called dissociative subtype. This article sets out important issues to be examined in the future study of dissociation in PTSD, which needs to be informed by solid conceptual understandings of dissociation.  
  Address a Department of Psychology , University of Canterbury , Christchurch , New Zealand  
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  ISSN 1529-9732 ISBN Medium  
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  Notes PMID:24983300 Approved no  
  Call Number UU @ jana.mullerova @ Serial 42200  
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Author Steenweg, R.J.; Hennin, H.L.; Bêty, J.; Gilchrist, H.G.; Williams, T.D.; Crossin, G.T.; Love, O.P. url  openurl
  Title Sources of diel variation in energetic physiology in an Arctic-breeding, diving seaduck Type Journal Article
  Year 2015 Publication Abbreviated Journal General and Comparative Endocrinology  
  Volume 216 Issue Pages 39-45  
  Keywords Arctic; Corticosterone; Diel rhythm; Energetic physiology; Sea duck; Triglyceride  
  Abstract Diel variation in baseline glucocorticoid (GC) secretion influences energetics and foraging behaviors. In temperate breeding, diurnal vertebrates, studies have shown that daily patterns of baseline GC secretion are influenced by environmental photoperiod, with baseline GCs peaking prior to sunrise to stimulate waking and foraging behaviors. Measures of physiological energy acquisition are also expected to peak in response to foraging activity, but their relationship to GC levels have not been well studied. In contrast to temperate breeding species, virtually nothing is known about diel GC and energetic metabolite secretion in Arctic breeding species, which experience almost constant photoperiods in spring and summer. Using a ten-year dataset, we examined the daily, 24-h pattern of baseline corticosterone (CORT) and triglyceride (TRIG) secretion in approximately 800 female pre-breeding Arctic-nesting common eiders (. Somateria mollissima). We related these traits to environmental photoperiod and to tidal cycle. In contrast to temperate breeding species, we found that that neither time of day nor tidal trend predicted diel variation in CORT or TRIG secretion in Arctic-breeding eiders. Given the narrow window of opportunity for breeding in polar regions, we suggest that eiders must decouple their daily foraging activity from light and tidal cycles if they are to accrue sufficient energy for successful breeding. As CORT is known to influence foraging behavior, the absence of a distinct diel pattern of CORT secretion may therefore be an adaptation to optimize reproductive investment and likelihood for success in some polar-breeding species. © 2015 Elsevier Inc.  
  Address Simon Fraser University, Burnaby, BC, Canada  
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  Notes Export Date: 17 March 2016 Approved no  
  Call Number McgGll @ elizabethburgess @ Serial 42530  
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Author Hennin, H.L.; Legagneux, P.; Bêty, J.; Williams, T.D.; Grant Gilchrist, H.; Baker, T.M.; Love, O.P. url  openurl
  Title Pre-breeding energetic management in a mixed-strategy breeder Type Journal Article
  Year 2015 Publication Abbreviated Journal Oecologia  
  Volume 177 Issue 1 Pages 235-243  
  Keywords Breeding threshold; Corticosterone; Energetic management; Energetic metabolites; Mixed-strategy breeder  
  Abstract Integrative biologists have long appreciated that the effective acquisition and management of energy prior to breeding should strongly influence fitness-related reproductive decisions (timing of breeding and reproductive investment). However, because of the difficulty in capturing pre-breeding individuals, and the tendency towards abandonment of reproduction after capture, we know little about the underlying mechanisms of these life-history decisions. Over 10 years, we captured free-living, arctic-breeding common eiders (Somateria mollissima) up to 3 weeks before investment in reproduction. We examined and characterized physiological parameters predicted to influence energetic management by sampling baseline plasma glucocorticoids (i.e., corticosterone), very-low-density lipoprotein (VLDL), and vitellogenin (VTG) for their respective roles in mediating energetic balance, rate of condition gain (physiological fattening rate) and reproductive investment. Baseline corticosterone increased significantly from arrival to the initiation of reproductive investment (period of rapid follicular growth; RFG), and showed a positive relationship with body mass, indicating that this hormone may stimulate foraging behaviour to facilitate both fat deposition and investment in egg production. In support of this, we found that VLDL increased throughout the pre-breeding period, peaking as predicted during RFG. Female eiders exhibited unprecedentedly high levels of VTG well before their theoretical RFG period, a potential strategy for pre-emptively depositing available protein stores into follicles while females are simultaneously fattening. This study provides some of the first data examining the temporal dynamics and interaction of the energetic mechanisms thought to be at the heart of individual variation in reproductive decisions and success in many vertebrate species. © 2014, Springer-Verlag Berlin Heidelberg.  
  Address Environment Canada, National Wildlife Research Centre, Carleton University, Ottawa, ON, Canada  
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  Notes Cited By :1; Export Date: 17 March 2016 Approved no  
  Call Number McgGll @ elizabethburgess @ Serial 42531  
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Author Émond, K.; Sainte-Marie, B.; Galbraith, P.S.; Bêty, J. url  openurl
  Title Top-down vs. bottom-up drivers of recruitment in a key marine invertebrate: Investigating early life stages of snow crab Type Journal Article
  Year 2015 Publication Abbreviated Journal ICES Journal of Marine Science  
  Volume 72 Issue 5 Pages 1336-1348  
  Keywords cannibalism; climate; groundfish predation; larval production; population dynamics; recruitment; snow crab  
  Abstract Many snow crab fisheries have fluctuated widely over time in a quasi-cyclic way due to highly variable recruitment. The causes of this variability are still debated. Bottom-up processes related to climate variability may strongly affect growth and survival during early life, whereas top-down predator effects may be a major source of juvenile mortality. Moreover, intrinsic density-dependent processes, which have received much less attention, are hypothetically responsible for the cycles in recruitment. This study explored how climate, larval production, intercohort cannibalism and groundfish predation may have affected recruitment of early juvenile snow crab in the northwest Gulf of St Lawrence (eastern Canada) over a period of 23 years. Abundance of early juvenile snow crabs (2.5-22.9 mm in carapace width), representing the first 3 years of benthic life, came from an annual trawl survey and was used to determine cohort strength. Analyses revealed a cyclic pattern in abundance of 0+ crabs that may arise from cohort resonant effects. This pattern consisted of three recruitment pulses but was reduced to two pulses by age 2+, while the interannual variability of cohort strength was dampened. This reconfiguration of the earliest recruitment pattern was dictated primarily by bottom water temperature and cannibalism, which progressively overruled the pre-settlement factors of larval production and surface water temperature that best explained abundance of 0+ crabs. The results strongly suggest that bottom-up and density-dependent processes prevail over top-down control in setting the long-term trends and higher-frequency oscillations of snow crab early recruitment patterns. © 2015 International Council for the Exploration of the Sea 2015. All rights reserved. For Permissions, please email: journals.permissions@oup.com.  
  Address Department of Fisheries and Oceans, Maurice Lamontagne Institute, 850 Route de la Mer, Mont-Joli, QC, Canada  
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  Notes Export Date: 17 March 2016 Approved no  
  Call Number McgGll @ elizabethburgess @ Serial 42532  
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