Reproductive Traits of Some Amphipods (Crustacea: Peracarida) in Different Habitats of Iran and Southern Caspian Sea

Table 2

Mean length of male and female specimens for each species.

Species	Mean length ± SE^a	𝑡-value^b	Sex ratio (F/M)	Min. and max. length of ovigerous female
Gammarus lacustris; G.O. Sars, 1863	𝐹=12.42±0.12 (321); 𝑀=12.87±0.16 (397)	2.26*	1 : 1.5	8–16.7
Gammarus paricrenatus; Stock et al. 1998	𝐹=11.01±0.13 (274); 𝑀=12.04±0.14 (350)	5.43*	1 : 1.2	10–14.5
Gammarus komareki; Schaferna, 1992	𝐹=7.65±0.04 (876); 𝑀=8.71±0.05 (1093)	16.64*	1 : 1.2	5.5–12
Gammarus aequicauda; Martynov,1931	𝐹=9.94±0.11 (228); 𝑀=10.94±0.16 (274)	6.74*	1 : 1.2	5.4–14
Obesogammarus acuminatus; Stock et al. 1998	𝐹=11.03±0.21 (120); 𝑀=11.43±0.26 (109)	1.17	1 : 1.2	7.2–16.7
Pontogammarus maeoticus; (Sowinsky, 1894)	𝐹=8.49±0.09 (334); 𝑀=7.89±0.05 (641)	5.73*	1 : 2.2	6.1–12.8
Pontogammarus borceae; (Carausu, 1943)	𝐹=8.62±0.10 (236); 𝑀=8.60±0.09 (214)	0.23	1 : 1	5–13.3

^aThe measurements did not include newly hatched and juvenile individuals.
The numbers are examined presented in the parenthesis.
^b𝑡-test for equality of mean length between sexes.
*Significant difference at the  .05 level.