Abstract This study analyzed mtDNA sequences of two bottlenose dolphin subspecies found along the northern Patagonian coast, Argentina: the endangered Tursiops truncatus gephyreus and the data deficient Tursiops truncatus truncatus. Three haplotypes were recovered from nine samples. The most frequent haplotype represented the coastal morph, also two haplotypes showing falcate dorsal fin, a characteristic describing the oceanic morph. This finding suggests that both morphs may exist in sympatry in Argentina. Furthermore, sampling was extended beyond the species’ previously known range, including individuals as far as seven hundred kilometers to the south. Therefore, new genetic data, despite being preliminary, hint at an unexpectedly higher genetic diversity of matrilines than previously anticipated.

中文翻译：

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阿根廷海岸濒临灭绝的宽吻海豚亚种的新遗传多样性

摘要 本研究分析了在阿根廷巴塔哥尼亚北部海岸发现的两个宽吻海豚亚种的 mtDNA 序列：濒临灭绝的 Tursiops truncatus gephyreus 和缺乏数据的 Tursiops truncatus truncatus。从九个样品中回收了三个单倍型。最常见的单倍型代表沿海变种，还有两种单倍型显示镰状背鳍，这是描述海洋变种的特征。这一发现表明这两种变形可能在阿根廷存在。此外，采样范围超出了该物种先前已知的范围，包括最远以南 700 公里的个体。因此，新的遗传数据尽管是初步的，但暗示母系的遗传多样性出乎意料地高于以前的预期。