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。

测定了采自浙江省瑞安市的一头须鲸类标本的线粒体DNA（mitochondrial DNA，mtDNA）细胞色素b（cytochrome b, cyt b）基因369 bp和控制区（control region）933 bp的序列，通过与已发表的须鲸类同源序列比对，发现与西太平洋和日本水域的布氏鲸的cyt b基因和控制区分别有6.78%～7.05%和13.30%<14.40%的序列差异，而与来自所罗门群岛的的布氏鲸之间cyt b基因的序列完全相同，控制区的序列也仪相差一个碱基（0.28%）。提示与邻近的西太平洋和日本海的普通布氏鲸在遗传上有显著区别，而可能与所罗门群岛的布氏鲸为同一种，即小布氏鲸（Balaenoptera edeni）。同时表明，应用分子生物学手段来进行鲸肉及其制品的种类鉴定是可行和有效的。

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。

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.

台湾海峡厦门-东山水域瓶鼻海豚（Tursiops aduncus）的种群密度约为0.0436±O.0286头/km2，该水域南部瓶鼻海豚的发现辛高于中部和北部；问卷谓查和随船出海调查表明围网作业发现和误捕小型鲸类的频率要高于拖网，同时拖网又高于刺网。调查期间从东山港记录到的误捕致死的20头小型鲸类中，6头（占30%）为瓶鼻海豚，分别由拖罔和围网捕获，需要开展对当地渔民的宣传教育和加强台湾海峡瓶鼻海豚等小型鲸类的种群生物学和保护生物学的研究。