Effects of environmental factors on diversity of befouling organisms in Imam Khomeini port

Subject Areas : New Technologies in Aquaculture Development

E.  Khoda Bakhsh ¹ (Ph.D. Student, Science & Research Branch, Islamic Azad University)
M.B.  Nabavi ² (Faculty Member of the scientific University of Science and Technology navy Khoramshar)
Sh.  Ghobadi ³ (Faculty member Islamic Azad University, Babul Branch)
E.  Khoda Bakhsh ⁴ (M.Sc. of Environmental)
H.  Khoda Bakhsh ⁵ (Ph.D. Candidate of Veterinarian)

Received: 2019-11-07 Accepted : 2019-11-07 Published : 2008-08-22

Keywords: Environmental factors, Diversity, Biofouling,

Abstract :

In this research the sampling was done from the organisms of piles of Imam Khomeini port in 4 stages, each Three months, from January 2005 to October 2006. Five stations were chosen and samples were taken from three zones: super tidal zone, inertial zone and sub tidal zone in 1×1m2. At the same time, the environmental factors (pH, Salinity, DO, Temperature) of each stage were measured. Ecological indices such as Shanon, species richness, Simpson and evenness were calculated. There results showed that the diversity of organisms in piles of Imam Khomeini port was low, but the species richness was high. Barnacle (Balanus amphytrit) was the dominant species inall 3 tidal zones. Results of variation analysis between diversity and environmental factors were significant only for temperature (-0.349). Temperature was the only factor which had significant effect on diversity of biofouling organisms, other factors (i.e. pH, DO and Salinity) had no significant effects. Moreover, the results showed that the increase in temperature causes decreases in biodiversity but it increases the richness. On the other hand, the results revealed a positive correlation between temperature and Simpson index (0.380) and negative correlation between temperature and Shanon, evenness and species richness indices. Also a negative correlation between Simpson with Shanon, evenness, and richness indices, was observed. In brief, the results indicated that increases so it shown that increases in species dominance was joint with decreasing in biodiversity and species richness.