Oligochaetes are the most abundant benthic taxa in aquatic ecosystems that play an important role in food webs and energy transmission. The aim of the current study is to assess the origin and diversity of Eiseniella tetraedra a non-native species of Lar National Park in Alborz Mountain ranges of Iran and also its response to current and future climate change. To this, we collected the specimen (23 samples) from Lar National Park Rivers and performed the mitochondrial gene, mitochondrial Cytochrome c oxidase subunit I (COI) combining them with 117 sequences from Jajroud, Karaj River in Iran and native regions from GenBank (NCBI). We also used an ensemble model approach for Species Distribution Modelings (SDMs) that it was estimated according to two Shared Socio-economic Pathways (SSPs): 126 and 585 of the MRI-ESM2 based on CMIP6. According to our results, all the samples examined in the current study originated from Spanish rivers and there was no unique haplotype found in Lar National Park. Moreover, The results also show high haplotype diversity that can have a positive effect on the success of its non-native in the different freshwater of Iran. As well as, the result of SDMs maps illustrated that climate change would significantly affect the distribution of E. tetraedra and it showed a sharp tendency to expand and verified the invasion power of the E. tetraedra in Iran's freshwater ecosystems over time.

| INTRODUC TI ONThe length-weight (LWRs) and length-length (LLRs) relationships are useful for the prediction of weight from length and vice versa, assessment of fish stocks and obtaining information on the condition and that these species were listed in Esmaeili et al. (2017). Because the information for most endemic freshwater fish species is still missing, in this study, the parameters of the length-weight relationships are presented for four Garra species collected from 27 different localities. | MATERIAL S AND ME THODSThe specimens were collected using hand net (2 mm mesh size), cast net (5 mm mesh size) and also electrofishing in 27 different sites from different basins during the summers of 2017 and 2018.Captured fishes were preserved in 10% neutralized formalin and transferred to laboratory to measure their total length (TL), fork length (FL), standard length (SL) and total wet weight for each specimen. Measuring length was to the nearest 0.1 cm using a digital caliper and weight to the nearest 0.01 g using a digital scale. The length-weight relationships were determined by the method of least squares using the equation W = aL b (Wang, Wang, Sun, Huang, & Shen, 2012), where W was the weight of the fish in grams and L the length of the fish in millimeter, "a" parameter is the intercept and "b" parameter is the slope. The length-length relationships were estimated by linear regression analysis: TL = a + bSL and SL = a + bFL,where TL is total length, SL is standard length, FL is fork length, "a" parameter is the intercept and "b" parameter is the slope of the linear regression. The confidence limit at 95% was calculated for both a and b parameters. | RE SULTSSample size, body length, body weight and the length-weight relationship parameters (a, b, r 2 ) for each species are given in Table 1.Length-length relationships parameters ("a" and "b" parameters) and the coefficient of determination (r 2 ) are presented in Table 2. The b value in LWRs for these four species varied from 2.7 to 3.21. | D ISCUSS I ONThe exponent "b" in length-weight relationships should normally fall between 2.5 and 3.5 (Froese, 2006). The value of exponent "b" for G. amirhosseini was 3.21, for G. gymnothorax 3.11, for G. mondica 2.87 and for G. rosica 2.7, are in the normal range. Hashemzadeh Segherloo et al. (2015) reported the value of "b" for G. rufa between 2.74 to 3.19 with average of 2.99 in Tigris basin and 2.96 in AbstractThis study describes the length-weight and length-length relationships for four species of Garra, viz., G. amirhosseini, G. gymnothorax, G. mondica and G. rosica in Iranian basins. The specimens were collected using hand net, cast net and also electrofishing in 27 different sites from different basins from November 2017 to June 2018. Significantly different b values from the expected value in length-weight relationships were observed for all the species but one. The value of the parameter b varied between 2.70 and 3.21 among the species.

Morphological differentiation and sexual dimorphism in the two genetically distinct clades (Northern and Southern clades) of the Lorestan newt, Neurergus kaiseri, was evaluated for 72 live specimens, using five body- and nine head-related characters and eight calculated ratios. Principle component analysis of morphological characters confirmed that the Lorestan newt populations are well separated into two distinct groups, suggesting that a taxonomic revision in N. kaiseri may be required because of significant molecular, morphological and ecological differences between these clades. Sexual dimorphism in N. kaiseri includes body size and shape. Females were clearly larger than males in most body- and head-related variables and males had relatively greater head width and eye length. Sexual dimorphism in this species may be linked to sexual selection and ecological differences between sexes. However, many aspects of the ecology and reproductive biology of this species remain unknown.

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