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      Widespread colonisation of Tanzanian catchments by introduced Oreochromis tilapia fishes: the legacy from decades of deliberate introduction


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          From the 1950s onwards, programmes to promote aquaculture and improve capture fisheries in East Africa have relied heavily on the promise held by introduced species. In Tanzania these introductions have been poorly documented. Here we report the findings of surveys of inland water bodies across Tanzania between 2011 and 2017 that clarify distributions of tilapiine cichlids of the genus Oreochromis. We identified Oreochromis from 123 sampling locations, including 14 taxa restricted to their native range and three species that have established populations beyond their native range. Of these three species, the only exotic species found was blue-spotted tilapia ( Oreochromis leucostictus), while Nile tilapia ( Oreochromis niloticus) and Singida tilapia ( Oreochromis esculentus), which are both naturally found within the country of Tanzania, have been translocated beyond their native range. Using our records, we developed models of suitable habitat for the introduced species based on recent (1960–1990) and projected (2050, 2070) East African climate. These models indicated that presence of suitable habitat for these introduced species will persist and potentially expand across the region. The clarification of distributions provided here can help inform the monitoring and management of biodiversity, and inform policy related to the future role of introduced species in fisheries and aquaculture.

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          The online version of this article (10.1007/s10750-018-3597-9) contains supplementary material, which is available to authorized users.

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              The next generation of scenarios for climate change research and assessment.

              Advances in the science and observation of climate change are providing a clearer understanding of the inherent variability of Earth's climate system and its likely response to human and natural influences. The implications of climate change for the environment and society will depend not only on the response of the Earth system to changes in radiative forcings, but also on how humankind responds through changes in technology, economies, lifestyle and policy. Extensive uncertainties exist in future forcings of and responses to climate change, necessitating the use of scenarios of the future to explore the potential consequences of different response options. To date, such scenarios have not adequately examined crucial possibilities, such as climate change mitigation and adaptation, and have relied on research processes that slowed the exchange of information among physical, biological and social scientists. Here we describe a new process for creating plausible scenarios to investigate some of the most challenging and important questions about climate change confronting the global community.

                Author and article information

                Springer International Publishing (Cham )
                4 April 2018
                4 April 2018
                : 832
                : 1
                : 235-253
                [1 ]ISNI 0000 0004 0648 0244, GRID grid.8193.3, Department of Aquatic Sciences and Fisheries, , University of Dar es Salaam, ; P.O. Box 35064, Dar es Salaam, Tanzania
                [2 ]GRID grid.463660.1, Tanzania Fisheries Research Institute (TAFIRI), ; P.O. Box 9750, Dar es Salaam, Tanzania
                [3 ]ISNI 0000 0004 1936 7603, GRID grid.5337.2, School of Biological Sciences, , University of Bristol, ; Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
                [4 ]ISNI 0000000121901201, GRID grid.83440.3b, Department of Genetics, Evolution and Environment, , University College London, ; Darwin Building, Gower Street, London, WC1E 6BT UK
                [5 ]ISNI 0000000118820937, GRID grid.7362.0, School of Biological Sciences, , Bangor University, ; Bangor, Gwynedd LL57 2UW UK
                [6 ]ISNI 0000 0001 0468 7274, GRID grid.35349.38, Department of Life Sciences, Centre for Research in Ecology, Whitelands College, , University of Roehampton, ; Holybourne Avenue, London, SW15 4JD UK
                [7 ]ISNI 0000 0004 0412 8669, GRID grid.9481.4, Evolutionary and Environmental Genomics Group, School of Environmental Sciences, , University of Hull, ; Hull, HU5 7RX UK
                Author information
                © The Author(s) 2018, corrected publication May 2018

                Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

                : 18 December 2017
                : 9 March 2018
                : 16 March 2018
                Funded by: Royal Society
                Award ID: AA130107
                Award ID: AA100023
                Award Recipient :
                Funded by: FundRef http://dx.doi.org/10.13039/501100000268, Biotechnology and Biological Sciences Research Council;
                Award ID: BB/M026736/1
                Award Recipient :
                Advances in Cichlid Research III
                Custom metadata
                © Springer Nature Switzerland AG 2019

                cichlid,invasive species,aquaculture,capture fisheries,tilapia,oreochromis


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