جۆری توێژینه‌وه‌: Original Article

نوسه‌ران

1 Marine Science Centre, Basrah University, Basrah, Iraq.

2 Dept. of Biology, College of Science, Al-Anbar University, Al-Anbar, Iraq.

3 Biology Dept. Baghdad University, Baghdad, Iraq.

4 Dept. of Biology, College of Education, Karbala University, Karbala, Iraq.

پوخته‌

The density and reproductive biology of Uca sindensis were studied in
intertidal zone of Khor Al-Zubair, south of Shatt Al-Basrah river, Basrah, Iraq.
The crabs were collected randomly three 0.25m2
quadrates during low tide
periods from November 2014 to October 2015. Density of crabs, sex ratio,
distribution, population structure, diameter burrow, breeding season and
fecundity were investigated. The results showed that crabs population fluctuated
and depended on the months of the year. Crabs density in study area was
(181ind/ m2
in April 2015) and (19 ind./m2
in December 2015). The CW of
females ranged from 4 to 13.5 mm and of males from 5 to 16 mm indicating
sexual dimorphism. The relationship between Carapace width (CW) × Carapace
height (CH) was positive in males and females. The equation (Log CH=Log-
4.644+4.362LogCW) for males (P<0.05) and Log CH=Log-2.152+3.299LogCW
for females (P<0.05). Sex ratio showed lower number of females than males for
study area, The overall sex ratio was 1:1.26 and did not differ significantly
from the expected 1:1 (χ test, P>0.05), however the monthly sex ratio was
different from expected 1:1(χ test, P<0.05). Breeding took place during warm
season of March to October 2015. The regression analysis showed that the
number of eggs increased linearly with the increase of carapace width (r2
=
0.775, n=38). It was concluded that some factors of temperature, Salinity and
TOM in sediment affected at density growth and reproduction pattern in U.
sindensis.

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