Effect of Environmental Factors on The Relative Fitness and Spatial Distribution of Mangrove Crabs (Scylla spp) in Blok Bedul Segoro Anak, Alas Purwo National Park, Indonesia

Abstract

The mangrove forest are natural and renewable. resources Mangrove has the physical, chemical
and biological function which highly support the fulfillment of human needs and serve as a buffer
balance of the ecosystem in coastal areas. One of the functions associated with the mangrove
biological existence as a source of diversity of marine life. Marine life is affected by the presence
of mangrove forests among mangrove crab (Scylla serrata) to maintain the ecological balance and
cause the energy cycle running fast. This study aims to determine the condition of environmental
factors, the relative fitness and spatial distribution of mangrove crabin the mangrove forests Block
Bedul Kali Segoro Alas Purwo National Park. Data from the study are described and classified by
similarity of environmental factors, then performed multiple linear regression between
environmental factors with relative fitness and spatial distribution of mangrove crabs. The results
showed that the average relative fitness mangrove crabs at all the research station is 69 with a
standard deviation of 13.51. Spatial distribution of mangrove crab at any observation station is
less than 1, so it can be concluded that the distribution is uniform. Environmental factors with
relative fitness mud crab significant correlation, but no significant correlation between
environmental factors with the spatial distribution of mangrove crabs.

Keywords: Relative Fitnes Crab Mangrove, Mangrove Crab Spatial Distribution, Alas Purwo National Park