RT - Journal Article T1 - Investigating of Biological Health of Mangrove Forest in Nayband Bay Using Macrobenthic Communities JF - JOC YR - 2020 JO - JOC VO - 10 IS - 40 UR - http://joc.inio.ac.ir/article-1-1293-en.html SP - 97 EP - 112 K1 - Nayband bay K1 - Mangrove forest K1 - Macrobenthos K1 - CCA K1 - Physico-chemical factors AB - Abstract The purpose of this study is to survey the ecological health of mangrove forest in Nayband bay by Shannon diversity index and determine the environmental factors effective in distribution of macrobenthic. 6 transects along coasts of Nayband bay were sampled for macrobenthos identification and enumeration. In each transect 3 stations were selected in perpendicular line to the beach. Physicochemical parameters such as Temperature, Salinity, Turbidity, Phosphate, Nitrate, Chlorophyll etc. were measured in addition to sediment grain size and TOM. Totally 60 macrobenthos species identified. Gastropods and Bivalves in Mollusca phylum were the dominant group with the contribution 48% of total macrobenthos population. Pirenella cingulata and Protapes gallus were the dominant species in Gastropods and Bivalves respectively. Maximum average total numbers of benthos were 5361.56 and 5584.78 individual/m2 in winter and summer respectively and minimum average number was 1957.56 individual/m2 in spring. Parametric statistical tests showed significant difference between number and frequency of species in different seasons and station (p<0.05). CCA analysis showed that salinity, turbidity and TOM are an effective factors in distribution of crustacean and bivalves. Phosphate, silt & clay and chlorophyll a have positive impact and sand present and temperature have negative impact on distribution of Gastropods. Temperature is important factor on density of polychaetes. Shannon diversity index showed that the studied area is moderate in terms of biological health. LA eng UL http://joc.inio.ac.ir/article-1-1293-en.html M3 10.52547/joc.10.40.97 ER -