Widespread colonisation of Tanzanian catchments by introduced Oreochromis tilapia fishes: the legacy from decades of deliberate introduction
Widespread colonisation of Tanzanian catchments by introduced Oreochromis tilapia fishes: the legacy from decades of deliberate introduction
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DOI：
10.1007/s10750-018-3597-9
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发表时间：
2018-04
期刊：
影响因子：
2.6
通讯作者：
A. Shechonge;B. Ngatunga;Stephanie J. Bradbeer;J. J. Day-J.;J. Freer;A. Ford;Jonathan Kihedu;Tabitha Richmond;S. Mzighani;ALAN M. Smith;E. Sweke;R. Tamatamah;Alexandra Tyers;G. Turner;M. Genner
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文献类型：
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作者：
A. Shechonge;B. Ngatunga;Stephanie J. Bradbeer;J. J. Day-J.;J. Freer;A. Ford;Jonathan Kihedu;Tabitha Richmond;S. Mzighani;ALAN M. Smith;E. Sweke;R. Tamatamah;Alexandra Tyers;G. Turner;M. Genner
从1950年代起，东非促进水产养殖和改善捕捞渔业的方案在很大程度上依赖于引进物种的前景。在坦桑尼亚，这些引进的记录很少。在这里，我们报告了2011年至2017年期间对坦桑尼亚内陆水体进行调查的结果，这些调查澄清了Oreochromis属的罗非鱼的分布。我们确定Oreochromisfrom 123个采样点，包括14个类群限制在其原生范围和三个物种，已建立的人口超出其原生范围。在这三个物种中，唯一发现的外来物种是蓝斑罗非鱼（Oreochromis leucostictus），而尼罗河罗非鱼（Oreochromis niloticus）和辛吉达罗非鱼（Oreochromis esculentus）都是在坦桑尼亚境内自然发现的，但它们已经迁移到了其本土范围之外。使用我们的记录，我们开发了模型的基础上最近（1960年至1990年）和预测（2050年，2070年）东非气候引进的物种的适宜栖息地。这些模型表明，这些引入物种的合适栖息地将持续存在，并有可能在整个地区扩大。这里提供的分布澄清可以帮助为生物多样性的监测和管理提供信息，并为与引进物种在渔业和水产养殖中的未来作用有关的政策提供信息。
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 genusOreochromis. We identifiedOreochromisfrom 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.