RELATIONSHIP BETWEEN BURROWS AND CRAB DENSITY IN MANGROVE ECOSYSTEM OF HAU LOC DISTRICT, THANH HOA PROVINCE
Keywords:Relationship, burrows, crab density, mangrove, Hau Loc, Thanh Hoa
The study on the relationship between burrows and crab density in the mangrove ecosystem of Hau Loc district, Thanh Hoa province carried out in December 2020 at 19 sites representing 3 habitats in the study area. The results showed that the burrows and the crabs density changed markedly with the increasing trend from ith an increasing trend from under-5-year-old forest, sparse forest, low tree forest to forest habitat over 9 years old. At the survey sites, the higher the forest age, the greater the coverage, the higher the amount of organic humus from the falling matter, the higher the density of burrows (which can reach more than 150 burrows/m2 and crab density can reach nearly 50 inds/m2). The correlation between burrows and crab density has been determined in the habitats and in the entire mangrove ecosystem. In which the correlation between burrows and crab density in newly planted forests under 5 years old is not close, in forests 5 - 9 years old and forests over 9 years old is positive and quite close (with R² = 0,6636 and R² = 0.,6734). The correlation between burrows and crab density in the entire mangrove area of Hau Loc district is also positive and close (with R² = 0,8481).
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