Capital of several empires through centuries, Istanbul has been a populated city in history. However, the population has increased by a factor of 13.3 over the last seven decades, which in turn has made this megacity a hotspot of domestic and industrial pollution. Marine biodiversity around Istanbul suffered from the increased pressures due to overfishing, extensive recreational usage, extreme habitat destruction and introduction of alien species via heavy maritime traffic. 70 years before, Muzaffer Demir published a colossal marine biodiversity study in 1952. We used the organization of this publication, and particularly employed it as a methodology, combined with Underwater Visual Census for a later study between 1997–1999 which involved more than 100 scuba dives. Our study investigated the abundance status of benthic species living mainly on rocky reefs as deep as 50 meters. The investigated species represented four phyla: Cnidaria, Echinodermata, Mollusca and Porifera. Approximately 40% of cnidarians, 40% of echinoderms, 65% of molluscs, and 80% of sponges recorded in the 1950s, were not recorded during our study, particularly due to methodological differences and population collapses or local extinctions. This paper aims to analyze and compare the temporal aspects of marine biodiversity in the Prince’s Islands and Bosphorus region using several time domains; historical records, Demir’s compendium in 1952, our field study in the closing of the previous millennium, combined efforts of the Turkish Journal of Zoology in 2014 of Turkey biodiversity checklists, and the most recent literature after that.

几个世纪以来，伊斯坦布尔是几个帝国的首都，历史上一直是人口稠密的城市。然而，在过去七年里，人口增加了 13.3 倍，这反过来又使这个特大城市成为家庭和工业污染的热点。由于过度捕捞、广泛的娱乐用途、极端的栖息地破坏和通过繁忙的海上交通引入外来物种，伊斯坦布尔周围的海洋生物多样性受到越来越大的压力。70 年前，穆扎弗·德米尔 (Muzaffer Demir) 于 1952 年发表了一项巨大的海洋生物多样性研究。我们利用该出版物的组织结构，特别将其用作一种方法，并结合水下视觉普查在 1997 年至 1999 年之间进行了一项涉及 100 多个潜水员的后续研究潜水。我们的研究调查了主要生活在 50 米深的岩礁上的底栖物种的丰度状况。被调查的物种代表四个门：刺胞动物门、棘皮动物门、软体动物门和多孔门。1950 年代记录的大约 40% 的刺胞动物、40% 的棘皮动物、65% 的软体动物和 80% 的海绵在我们的研究中没有被记录，特别是由于方法学差异和种群崩溃或局部灭绝。本文旨在使用多个时域分析和比较王子群岛和博斯普鲁斯海峡地区海洋生物多样性的时间方面；历史记录、德米尔 1952 年的纲要、我们在上个千年结束时的实地研究、土耳其动物学杂志 2014 年土耳其生物多样性清单的共同努力，以及之后的最新文献。