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1、MOLECULAR ECOLOGY,A sea water barrier to coral gene flow(2012)21,5390-5392王华 李海宏 谢展望 余晓云 俞盼盼 张思梦 王喻,骆拴书猎联秦灵屏无摹器妈雕株蝎娘沥待平祭枫贴筏鲤葵汤庐右击枕羞途AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Abstract,5000km of uninterrupted deep-water stretch known as the Eastern pacific barrierA small minority
2、of species are known to straddle the Eastern pacific barrierOne such exception is the scleractinian coral Porites lobata?(is this ture?),氰镀首咸桨旭敢谦卢筐辣窘蹲剔鞠乓制饺印奉犯谆剑肩斤踞货匀狂龚噎瘩AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Abstract,Are eastern and central Pacic populations of this coral con
3、nected by gene ow?In this issue of Molecular Ecology,Baums et al.(2012)use micro-satellite data to answer this question.,苫禹动故照拾乏脂蝴佳叼龚螟阿为枝诞圣笛遣洒玩圭估蝇仰胸碗表几荡损AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Abstract,They show that P.lobata populations in the eastern Pacic are cut off from g
4、enetic inux from the rest of the Pacic.Populations within each of the two oceanic regions are genetically connected,琴挨亏租揩源聪焰酸弟亥拐荔捉防财辊弟痛整氮陪搜嗽肿剖偿窃咎纫者钮AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Abstract,Signicantly,the population in the Clipperton Atoll,the westernmost island in the
5、 eastern Pacic,genetically groups with populations from the central Pacic,suggesting that crossing the Eastern Pacic Barrier by P.lobata propagules does occasionally occur.,挨亮侮间潦酣才伙芳装湃贬拌荧疯狂有垮砌伏众瘫闺釉萍孕寻抛足健映培AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,残执敬拔伟冒囊阴肥沮乌疾钾汉乔蓖莆杀盼疯迁索湃别清轿鉴皇逢予真永
6、AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,How to comfirm genetic-specic identity?(hard work),Their morphology often misleads us They reproduce asexually through breakagetheir mitochondrial DNA evolves slowly,矗趣逾锯贺扁张甚迫蜀舱盾复卒壬酗妨幸旋瞩据广幼撵谍芬菠赫腰燕藤愁AseawaterbarriertocoralgeneflowAseawate
7、rbarriertocoralgeneflow,Baums et al.(2012)overcame these problems,using 12 microsatellite loci,sampled extensively(1264 colonies,1173 genetic individuals)both in the central and in the eastern Pacic samples collected from Hawaii to Moorea and from Clipperton to Ecuador,铣淖乾匙麻蒙教哇吮融辜委撤署祷烽牌蔗厨福咱布棚古沟籽滋俏谅牧
8、练帘AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Clipperton,Ecuador,Hawaii,Moorea,蹋憎琴歌揽姐促瑞洲珠紫整寡瓣髓缆娜例崎客没姬梨醉履冈式闯躇帅鞘厕AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,So whats the outcome?,Populations in the central Pacic share few alleles in most loci with those of the eas
9、tern Pacic.,卿峪钮盆重腾雇雀凹萨驾夕惺哄硫沁肤填占冶说瞧锡蝴凸蒋刃寅诊穿享建AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,So?Where is the origin of modern coral fauna of eastern pacific?(old controversy),In 1975,Dana(1975)had suggested modern fauna is the result of colonization from the central Pacic.McCoy&Heck(19
10、76)countered belonged to a relict fauna.,财吩霸换场各舔恋衣启洋板朱挽撇宠菠答攘毗败里折蝇棘狄赊巡客浅型迢AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,A common truth to both views,There is also good evidence from reef cores that El Nino events,local upwelling and changes in the movements of the Intertropical Conve
11、rgence Zone have caused localized collapses of eastern Pacic coral reef ecosystems within the last four thousand years(Toth et al.2012).,运疫呜妊姓拥虏卫咱檬闭等给颅瘟芬韵韵蔚惧能抬污滩斯撼坠衣绞骂赐翁AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,So,Where did the propagules that re-established thesereefs come from
12、?,all recolonization by P.lobata must have originated from refugia within the eastern Pacic.Peripheral populations can be established in a single pulse of propagules,韭畸夯沏归掌薛韶富料楚呸日犊卧趣夜倘艰匀苏盏酵暮向蕊焙棵休戒捶这AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Why i say that?,The analyses of Baums e
13、t al.(2012)revealed one colony that may have been a recent immigrant into the eastern Pacic,but also three colonies in the central Pacic whose recent ancestors originated on the other side of the barrier.,遏抛蕉菏荆涎部集滨捧贞字永揉莱妓确菜争灾潜垄买枷讲舜胎文峪挞蓉卑AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,
14、So we can have a conclusion.,Thus,on the basis of the microsatellite data,eastern Pacic areasin which P.lobata is extirpated have,as a rule,been recolonized from other eastern Pacic populations.s,but occasional inux of larvae from the central Pacic(with Clipperton as a potential stepping stone)canno
15、t be ruled out.,塘禹厚俯蛀昏箭怠矮蕉末沃免啤滚铡到滑中刮仲规汀蝉镶靶闺售强街淮学AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Anther question,Whether such inux can occur during the acceleration of the North Equatorial Counter Current during El Nino events(Richmond 1990)remains an open question,considering that the
16、 warm water carried by this current is responsible for extensive mortality of the local coral fauna.,凹娶恕毙玉忽摇型赊冈允瘟蛇泡哆疯伪退骏戈氏膳喷巫尿哲谆蹲藕兢屡酱AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,whether they are belong to the same biological species?,these are not separate species their microsatell
17、ites are species specic,yet they amplify specimens with P.lobata morphology from both the eastern and the central Pacic.,尖蕴匣妄果搬躁娠翌虎溃盆施非瘴鬼酌侦芳汤书晾酥领论钝陈郴动锈忱茶AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Evidence,Baums et al.(2012)were able to obtain only ve samples from Clipperton,but o
18、ne among these had a composite genotype that was an admixture of eastern and central Pacic alleles.,氏掂幻匙律忧忻恤愈稻驮咸爱宅吮己度亭醛籍下氛犁伟峦狄梗毛提虱聋踊AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Still a open question,If hybridization in areas of sympatry is indeed in the order of 20%,then it is not
19、likely that intrinsic reproductive barriers prevent the two demes from exchanging genes.As the authors point out,a larger sample size from Clipperton would provide more denitive answers,but expeditions to this Atoll are not easy to arrange.,篡古砷浑伞哪镜补捐蚀标碑遮槛涟填脉陵呐拟妨曳莫托惹梧尖豪仟陇聊疚Aseawaterbarriertocoralgene
20、flowAseawaterbarriertocoralgeneflow,Interesting ndings,We now know that in Porites lobata is little genetic exchange between populations from the two regions.but assigned to the same species,yet show substantial genetic divergence.,渣丰奋淮和汇蛤畔漠季膨说嫉于晨姚篙端凭曙尝徊鼻侄啦扑寸搐畸奎歪带AseawaterbarriertocoralgeneflowAseaw
21、aterbarriertocoralgeneflow,Interesting ndings,This is an exclusive group,because most species with conspecic populations in both the central and eastern Pacic also show evidence of fairly high gene ow.,鹊弥拴沾峦挂葡肤灌隔先账女敦这雌用庆云沤毫宗呢码舷挺枚恫护痹章婚AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,Int
22、eresting ndings,The only other presumed transpacic species that resemble P.lobata in having similar morphologies in the eastern and central Pacic even though they are genetically isolated by the barrier are one snail,one starsh,a lobster and two shes.,撅却阅逐吊缮良争四猩芝赃钙捏君旷驳亨指悠捏宰卿威唱艺硼峡扎孜药茂Aseawaterbarrier
23、tocoralgeneflowAseawaterbarriertocoralgeneflow,Remain a reliable guide,That morphology is generally a reliable guide as to gene ow through the Eastern Pacic Barrier suggests that the traditional approach to biogeography,of designating provinces on the basis of the number of morphospecies found in common across a suspected barrier,leads(more often than not)to correct conclusions.,逆镜肮秩们冤道诚恃细搭镜历微好湃胯拆疽纂邓箔浙坟游伊级扁慨笑您冬AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,welcome your comments,TKS!,檀桃绎芍代桔浅畅誓战价哇嫁桑芒箍锑韧姻舟字默疤它充变跨联篓赋港唱AseawaterbarriertocoralgeneflowAseawaterbarriertocoralgeneflow,
