Analysis of the diversity and evenness of mangrove ecosystems in the Pacitan Coast, East Java, Indonesia

Abstract

Abstract. Sholiqin M, Pramadaningtyas PS, Solikah I, Febriyanti S, Pambudi MD, Mahartika SB, Umam AF, Liza N, Setyawan AD. 2021. Analysis of the diversity and evenness of mangrove ecosystems in the Pacitan Coast, East Java, Indonesia. Intl J Bonorowo Wetlands 11: 84-94. Indonesia has a high mangrove diversity with 43 species of true mangrove plants. Mangrove grows along the coastline of Indonesia’s islands, one of which is situated on the southern coast of Java. Pacitan, which belongs to the south coast of East Java and has 70,709 km of coastline, is an area with the potential to have diverse mangrove vegetation. The existence of mangroves plays a role in carbon sequestration and the stability of coastal ecosystems. This study aimed to determine the mangrove diversity and evenness index in the southern coast of Pacitan. This research was conducted on November 2021 in three locations, namely the Teleng Ria, Grindulu Estuary, and Siwil Beach. Data was collected using a plot of 10 x 10 m² for trees, 5 x 5 m² for saplings, and 2 x 2 m² for seedlings. The data obtained were analyzed using the Shannon Wiener and Evenness index to calculate the mangrove diversity and evenness value. There are 8 species of mangroves (7 species of major and 1 species of minor mangrove) and 2 species of associated mangroves, with the domination of Rhizophora stylosa. The Shannon Weiner diversity index shows that the mangrove diversity index in the research areas ranges from low to moderate. The Evenness Index presents that Teleng Ria Estuary possesses a high evenness value, indicating its stable mangrove condition.