测定了45个克隆的白紧豚（Lipotes zexilifer）MHCⅡ类基因DQB座位第二外元172bp的核苷酸序列，共获得15种序列，发现了22个变异位点。核苷酸的非同义替换明显多于同义替换，并造成了15个氨基酸的改变。氨基酸的替换趋于集中在假定的与抗原的选择性识别相关的位点附近。白鱀豚DQB基因的核苷酸和氨基酸序列与文献报道的白鲸（Delphinapterus leutcas）和一角鲸（Moncdon monoceroS）DQBl序列具有较高的同源性。氨基酸序列不具备人及其它一些灵长类动物DQB2基因所共有的基序（Motif），而与牛DQBl基因的基序相近，说明本研究得到的白紧豚MHC序列应属于类DQBl基因。同一个体出现了多种序列的情况，提示白鱀豚的DQB基因可能存在着座位重复。白鱀豚的类DQBl座位的序列中存在多种基序的不同组合，推测是由于基因转换造成的。

采用漩涡模型Vortex mondel 7.3，模拟了马边大风顶自然保护区大熊猫种群在未来100年内的变动趋势。结果显示：在无交配限制、无密度制约、无近亲交配衰退等条件下，马边大风顶自然保护区大熊猫种群数量呈下降趋势；在考虑近交衰退的影响后，遗传多样性水平降低，灭绝率提高；竹子开花虽能加速大熊猫种群的绝灭，但由于保护区分布有多个竹种，因此并不会对大熊猫种群产生灾难性影响；但是人为捕杀可迅速减少大熊猫种群数量，加速其灭绝过程。因此，对该保护区大熊猫进行保护的最重要措施就是严格控制人为捕杀，并保护栖息地及走廊带。

The mitochondial cont rol regions from 13 st riped dolphins (S tenella coeruleualba), seven from the southern Taiwan St rait s (Dongshan waters) and the other six from the southern East China Sea (Pingtan waters), were amplified by using polymerase chain reaction (PCR) technique. The complete nucleotide composition of this region, ranged from 914 to 917 base pairs (bp), were determined by an ABI 310 DNA automated sequencing system to address the sequence variability. 42 variable sites, including 36 transitions, three t ransversions, and three indels (insertion/ deletion) were found. Of the variable sites, 26 were parsimonious informative sites. Totally 11 haplotypes were identified. Of the haplotypes, six were found exclusively in Dongshan waters and the rest five only in Pingtan waters. No common haplotype was shared, and two fixed site differences were detected between haplotypes from two waters. The haplotype diversty and nucleotide diversity were high for both waters, which were 1.45% ±0.79% and 0.95 in Dongshan waters, and 1.06% ±0.51% and 0193 in Pingtan waters respectively. A phylogenetic t ree was reconst ructed by using neighbor-joining (NJ) method in MEGA (Molecular Evolutionary Genetic Analysis) package. In the t ree, haplotypes from the Pingtan waters constituted a monophyletic clade, whereas haplotypes from the Dongshan waters did not. Analysis of molecular variance, which was conducted by computer software AMOVA, showed an significant population differentiation and genetic st ructure (Φst =0.35, P<0.01) between Dongshan waters and Pingtan waters. The haplotype diversity and nucleotide diversity of st riped dolphins were higher than those found in the sympat ric finless porpoise (Neophocaena phocaenoides) populations, and also higher than those of other cetacean species reported previously in other waters, including some species having high level of genetic diversity, e. g. harbor porpoises (Phocoena phocoena), humpback whales (Megaptera novaeangliae) and bottlenose dolphins (Tursiops spp.) etc. This suggested that the st riped dolphins had a relatively higher genetic diversity.

测定了30头中国水域瓶鼻海豚（Tursiops sp.） mtDNA控制区5’端424bp的序列，结合已发表的中国水域其它瓶鼻海豚的mtDNA控制区序列，共发现54个变异位点,定义了37种单元型。中国水域瓶鼻海豚的两个形态型之间没有共享单元型，且具有8个鉴别位点。基于最大似然法和邻接法的系统发生分析均把单元型聚类为分别代表两个形态型的支系。形态型之间的核苷酸歧异度为5158%，超过了其它海豚类种间的序列歧异水平，支持把这两个形态型划分为两个独立的种，即T.truncatus和T.aduncus的观点。虽然两种瓶鼻海豚的分布区在台湾海峡一带出现重叠，但相互之间缺乏基因流动，提示两者可能已出现了显著的生殖隔离。

淡水豚类4个代表属[白暨豚（Lipotes）、恒河豚（platanista）、弗西豚（Ponioporia）和亚河豚（iaia）]mtDNA12SrRNA基因的序列差异水平，高于其他齿鲸类科间的差异、特别是远远高于悔豚总科内的科间差异。研究结果支持它们应归属于不同的科，即白暨豚科（LipotiMae）、恒河豚科（Platanisfidae）、弗西豚科（Pontoporidae）和亚河豚科（Iniidae）。恒河豚科是鲸类中最早分化出来的独立支系，而其余3个淡水豚科组成一个单系，作为海豚总科的姊妹群。淡水豚类的发生是多系的。白暨豚科、亚河豚科和弗西豚科是否隶属于同一个总科尚需进一步研究。