Genetic monitoring detects an overlooked cryptic species and reveals the diversity and distribution of three invasive Rattus congeners in South Africa.
Genetic monitoring detects an overlooked cryptic species and reveals the diversity and distribution of three invasive Rattus congeners in South Africa.
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DOI：
10.1186/1471-2156-12-26
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发表时间：
2011-02-16
期刊：
影响因子：
2.9
通讯作者：
Chimimba CT
中科院分区：
文献类型：
--
作者：
Bastos AD;Nair D;Taylor PJ;Brettschneider H;Kirsten F;Mostert E;von Maltitz E;Lamb JM;van Hooft P;Belmain SR;Contrafatto G;Downs S;Chimimba CT
南非长期和广泛的贸易活动为引进外来物种提供了充足的机会。南部非洲特有动物丰富的生物多样性一直是许多研究的重点，而入侵脊椎动物尽管对生物多样性、健康和农业有潜在影响，但通常被忽视。在南非对啮齿类动物进行的遗传监测发现了一种东南亚特有的黄胸鼠，这种鼠以前不知道在非洲发生过，这为扩大对所有入侵的黄胸鼠物种的研究提供了动力。为此，在南非28个地点和斯威士兰的一个地点进行了强化取样，确定了149个鼠属标本。细胞色素B基因测序显示存在两个R. tanezumi、7种鼠和5种褐家鼠单倍型。系统发育的结果与一个单一的，最近的R。tanezumi的介绍，并指出R. norvegicus和R. Rattus可能分别在至少两次和三次独立引进后才建立起来。种内和种间多样性最高的非正式人类住区，所有三个物种发生在一个单一的大都市乡镇网站。褐家鼠（Rattus norvegicus）和黑腹鼠（R.黄胸鼠与黄胸鼠同域发生的数量分别为1个和5个。对所选R. rattus和R. tanezumi个体鉴定的二倍体数量与先前报道的这些神秘物种一致。生物气候变量排序和MaxEnt生态位模拟结果表明，该物种的生物气候生态位主要分布在中国东北地区。南非的tanezumi与东南亚的归化分布区不同，这表明气候以外的因素可能影响本种的分布。这项研究突出了基因分型的价值，用于检测神秘的入侵物种，提供历史的见解介绍和指导未来的采样。一个神秘的物种显然很容易就能成为确定的物种，这表明需要更广泛地实施遗传监测方案。除了提供基线数据和可能查明高风险的引进路线外，在物种记录得到遗传核实后，生态小生境模型的预测能力也得到加强。
South Africa's long and extensive trade activity has ensured ample opportunities for exotic species introduction. Whereas the rich biodiversity of endemic southern African fauna has been the focus of many studies, invasive vertebrates are generally overlooked despite potential impacts on biodiversity, health and agriculture. Genetic monitoring of commensal rodents in South Africa which uncovered the presence of Rattus tanezumi, a South-East Asian endemic not previously known to occur in Africa, provided the impetus for expanded studies on all invasive Rattus species present. To this end, intensified sampling at 28 South African localities and at one site in Swaziland, identified 149 Rattus specimens. Cytochrome b gene sequencing revealed the presence of two R. tanezumi, seven Rattus rattus and five Rattus norvegicus haplotypes in south Africa. Phylogenetic results were consistent with a single, recent R. tanezumi introduction and indicated that R. norvegicus and R. rattus probably became established following at least two and three independent introductions, respectively. Intra- and inter-specific diversity was highest in informal human settlements, with all three species occurring at a single metropolitan township site. Rattus norvegicus and R. rattus each occurred sympatrically with Rattus tanezumi at one and five sites, respectively. Karyotyping of selected R. rattus and R. tanezumi individuals identified diploid numbers consistent with those reported previously for these cryptic species. Ordination of bioclimatic variables and MaxEnt ecological niche modelling confirmed that the bioclimatic niche occupied by R. tanezumi in south Africa was distinct from that occupied in its naturalised range in south-east Asia suggesting that factors other than climate may influence the distribution of this species. This study has highlighted the value of genetic typing for detecting cryptic invasive species, providing historical insights into introductions and for directing future sampling. The apparent ease with which a cryptic species can become established signals the need for broader implementation of genetic monitoring programmes. In addition to providing baseline data and potentially identifying high-risk introduction routes, the predictive power of ecological niche modelling is enhanced when species records are genetically verified.
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影响因子：
3.4
作者：
Pagès M;Chaval Y;Herbreteau V;Waengsothorn S;Cosson JF;Hugot JP;Morand S;Michaux J
通讯作者：
Michaux J
影响因子：
6.4
作者：
Fitzpatrick, Matthew C.;Weltzin, Jake F.;Dunn, Robert R.
通讯作者：
Dunn, Robert R.
影响因子：
3.7
作者：
Abhyankar, Avinash;Park, Hee-Bok;Luthman, Holger
通讯作者：
Luthman, Holger
影响因子：
1.1
作者：
Chinen, AA;Suzuki, H;Suzuki, S
通讯作者：
Suzuki, S
DOI：
10.1002/joc.1276
发表时间：
2005-12-01
期刊：
INTERNATIONAL JOURNAL OF CLIMATOLOGY
影响因子：
--
作者：
Hijmans, RJ;Cameron, SE;Jarvis, A
通讯作者：
Jarvis, A