Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2021
Authors
Tamaryn A. Asbury Rhett Bennett Aidan Price Charlene da Silva Markus Bürgener Juliana D. Klein Simo Maduna N. Sidat S. Fernando Aletta E. Bester-van der MerweAbstract
No abstract has been registered
Authors
Juliana D. Klein Tamaryn A. Asbury Charlene da Silva Kelvin L. Hull Matthew L. Dicken Enrico Gennari Simo Maduna Aletta E Bester-van der MerweAbstract
The common smooth-hound shark, Mustelus mustelus, is a widely distributed demersal shark under heavy exploitation from various fisheries throughout its distribution range. To assist in the development of appropriate management strategies, the authors evaluate stock structure, site fidelity and movement patterns along the species’ distribution in southern Africa based on a combination of molecular and long-term tag-recapture data. Eight species-specific microsatellite markers (N = 73) and two mitochondrial genes, nicotinamide adenine dehydrogenase subunit 4 and control region (N = 45), did not reveal any significant genetic structure among neighbouring sites. Nonetheless, tagging data demonstrate a remarkable degree of site fidelity with 76% of sharks recaptured within 50 km of the original tagging location. On a larger geographic scale, dispersal is governed by oceanographic features as demonstrated by the lack of movements across the Benguela-Agulhas transition zone separating the South-East Atlantic Ocean (SEAO) and South-West Indian Ocean (SWIO) populations. Microsatellite data supported very shallow ocean-based structure (SEAO and SWIO) and historical southward gene flow following the Agulhas Current, corroborating the influence of this dynamic oceanographic system on gene flow. Moreover, no movements between Namibia and South Africa were observed, indicating that the Lüderitz upwelling formation off the Namibian coast acts as another barrier to dispersal and gene flow. Overall, these results show that dispersal and stock structure of M. mustelus are governed by a combination of behavioural traits and oceanographic features such as steep temperature gradients, currents and upwelling systems.
Abstract
No abstract has been registered
Authors
Tommi Nyman Elena Papadopoulou Eeva Ylinen Saskia Wutke Craig T. Michell Ludmila Sromek Tuula Sinisalo Elena Andrievskaya Vyacheslav Alexeev Mervi KunnasrantaAbstract
No abstract has been registered
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Authors
Cornelya KlutschAbstract
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Authors
Yngvild Wasteson Henning Sørum Bjørn-Arne Lindstedt Adriana Dorota Osinska Arnfinn Sundsfjord Hans Geir Eiken Erik J. Joner Anders Aas Carsten Ulrich Schwermer Pawel Krzeminski Ernst Kristian Rødland Astrid Louise Wester Halfdan Olafssøn Andre Olafssøn Trond Ingebretsen Rune Holmstad Nina DueAbstract
No abstract has been registered
Authors
Paula Thitz Ann E. Hagerman Tendry R. Randriamanana Virpi Virjamo Minna Kosonen Mika Lännenpää Tommi Nyman Lauri Mehtätalo Sari Kontunen-Soppela Riitta Julkunen-TiittoAbstract
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Abstract
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Authors
Tove Aagnes Utsi Nigel Yoccoz Claire Armstrong Victoria Gonzalez Snorre Hagen Ingibjörg Svala Jónsdóttir Nhat Minh Pham Francisco I. Pugnaire Katriona Shea David A. Wardle Sophia Zielosko Kari Anne BråthenAbstract
No abstract has been registered