Large-scale movements and site fidelity of two bull sharks Carcharhinus leucas estimated from a double-tagging experiment at Reunion Island (southwest Indian Ocean)

WOS:000622208300001Since 2011, the mean number of bites per year by bull sharks Carcharhinus leucas has increased markedly at Reunion Island. To predict areas and periods of increased risk, we need to better understand the space-use dynamics of individual sharks. In coastal waters off Reunion Island, two bull sharks, one of each sex, were double-tagged and tracked for 174 days (male) and 139 days (female) using pop-up satellite archival tags (PSATs) and acoustic transmitters. Both sharks spent most of their time inshore (58.1% for the male and 89.9% for the female). The female performed short excursions but typically remained inshore. The male alternated between spending residence time along the coast and undertaking wide-ranging movements, including one extensive open-ocean excursion to the vicinity of a seamount situated about 210 km from the island. Differences in the residency and home range between the two sharks probably reflect different patterns of foraging and mating behaviours. Our results highlight the advantages of double-tagging in telemetry studies that attempt to estimate the degree of habitat fidelity of a species and illustrate the need to consider the movement patterns of sharks at different scales when developing efficient risk-mitigation management

Rev Med Interne

Introduction La consommation de cocaïne est associée à de multiples complications dont certaines peuvent mimer des maladies systémiques, particulièrement des vascularites associées aux Anticorps Anti-Cytoplasme des Neutrophiles (ANCA). Nous rapportons un cas de Cocaine Induced Midline Destructive Lesions (CIMDL) ayant fait discuter un diagnostic différentiel de granulomatose avec polyangéite (GPA). Observation Un homme de 42 ans, cocaïnomane, était hospitalisé pour bilan de lésions destructrices centro-faciales. Il n'avait pas d'atteinte extra-ORL. Biologiquement, il existait des ANCA de fluorescence périnucléaire en immunofluorescence indirecte et de spécificité anti-Protéinase 3 (immunodosage par chimiluminescence). Cette présentation immunologique particulière associée à l'absence d'argument histologique pour une GPA faisait retenir un diagnostic de CIMDL. Le patient était perdu de vue. Conclusion Les CIMDL correspondent à des lésions destructrices centro-faciales induites par la consommation de cocaïne par voie nasale. Elles sont fréquemment associées à la présence d'ANCA. Une fluorescence périnucléaire avec une double spécificité anti-HNE et anti-PR3 est évocatrice du diagnostic.Introduction Cocaine use is associated with multiple complications, some of which can mimic systemic diseases, especially Antineutrophil Cytoplasmic Antibody (ANCA) associated vasculitis. We report a case of Cocaine Induced Midline Destructive Lesions (CIMDL) for which a diagnosis of granulomatosis with polyangiitis (GPA) was discussed. Case report A 42-year-old male, cocaine consumer, was admitted in our department for a centrofacial destructive process. He had no extra ear, nose and throat (ENT) involvement. ANCA were positive with a perinuclear fluorescence pattern and an anti-Proteinase 3 specificity. Regarding this unusual immunologic pattern and in the absence of histological argument for a GPA, a diagnosis of CIMDL was made. Conclusion CIMDL is a centrofacial destructive process due to intranasal cocaine use. It is frequently associated with the presence of p-ANCA with both anti-HNE and anti-PR3 specificity

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