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From the Persian Gulf and Oman Sea (Gobioidei: Gobiidae)

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From the Persian Gulf and Oman Sea (Gobioidei: Gobiidae) ArchiveIranian of Journal SID of Fisheries Sciences 19(2) 612-622 2020 DOI: 10.22092/ijfs.2018.119368. Shape variation of the Indian Ocean slender mudskipper, Scartelaos tenuis (Day, 1876) from the Persian Gulf and Oman Sea (Gobioidei: Gobiidae) Ghanbarifardi M.1*; Aliabadian M.2,3; Esmaeili H.R.4 Received: January 2017 Accepted: September 2017 Abstract The shape diversity among populations of Scartelaos tenuis (Day 1876) from five stations (194 specimens) in the Persian Gulf, Strait of Hormuz (Qeshm Island), and the Oman Sea were investigated. The shape variation was assessed by geometric morphometrics, using 14 morphological landmarks. The two sexes were not distinguishable by the shape. Fish samples were classified into two distinct groups, the fish from the Persian Gulf (Heleh and Asaluyeh), and the specimens of Qeshm Island and the Oman Sea (Chahoo, Dargahan and Jask). The Persian Gulf and the Oman Sea are characterized by specific environmental parameters of surface waters, including temperature and salinity. The shape discrepancies of Scartelaos tenuis specimens from different stations are probably because of ecological parameters of the Persian Gulf and Oman Sea. Our results suggest that the observed pattern of morphological variation is almost some kind of polyphenism induced by distinct environmental factors. Keywords: Geometric morphometrics, Environmental factors, Polyphenism, Scartelaos tenuis, Persian Gulf, Oman Sea Downloaded from jifro.ir at 8:41 +0430 on Saturday April 4th 2020 1-Department of Biology, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran 2-Department of Biology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran 3-Research Department of Zoological Innovations (RDZI), Institute of Applied Zoology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran. 4-Ichthyology and Molecular Systematics Research Lab., Department of Biology, College of Sciences, Shiraz University, Shiraz 71454, Iran *Corresponding author's Email: [email protected] www.SID.ir Archive613 Ghanbarifardi of SID et al., Shape variation of the Indian Ocean slender mudskipper, Scartelaos tenuis from… Introduction dimensional coordinates of biologically Three species of mudskippers are definable landmarks are used for distributed in the Persian Gulf and Oman Landmark-based geometric morphometric Sea, including Boleophthalmus methods. Superimposition approaches dussumieri, Periophthalmus waltoni, and remove non-shape variation (variation in Scartelaos tenuis (Ghanbarifardi and position, orientation, and scale of the Malek, 2007). Based on recent molecular specimens) in configurations of landmarks phylogenetic trees for mudskippers, the by overlaying them and employing some Indian Ocean slender mudskipper, optimization criteria. Generalized Scartelaos tenuis (Day, 1876) is included Procrustes Analysis (GPA) is usually used in the “Periophthalmus lineage” of to superimpose landmark configurations gobionelline-like gobies (Gobiidae) and and remove the non-shape variation. After sister taxa for Boleophthalmus genus; the non-shape diversity has been moreover, ecomorphological adaptations eliminated, the shape variables could be of three Iranian mudskippers have been compared via multivariate statistics, and examined by geometric morphometric graphical representations of shape (thin- method (Ghanbarifardi et al., 2016; Polgar plate spline transformation grids) are et al., 2017). S. tenuis specimens from generated for comparison. GM presents Chabahar and Qeshm Island have been shape diversification, and it is employed as compared using meristic and a substitute to the linear measurements, morphometric characteristics; this study counts, and ratios used in conventional proves some differences between fish from morphometrics (Adams et al., 2004). GM two stations regarding length-weight has been used to study fish ecology, relationship and condition factor (Hashemi population biology and stock et al., 2015). Geometric morphometric and discrimination (Silva, 2003; Costa and Downloaded from jifro.ir at 8:41 +0430 on Saturday April 4th 2020 traditional morphometric methods have Cataudella, 2007; Mostafa et al., 2010). It been employed to investigate the has also been established that several morphologic diversity among various environmental elements have transiently or populations of P. waltoni (Ghanbarifardi et permanently affected the morphological al., 2014a,b). These two studies prove that traits of fish. Temperature (Loy et al., P. waltoni populations from the Persian 1996a), fish body condition (Fitzgerald et Gulf differ from those of the Oman Sea al., 2002), adaptations to specific habitat regarding the morphological types (Langerhans et al., 2003), predation characteristics. Age, growth (Abdoli et al., risk (Eklov and Svanback, 2006), and 2010) and feeding habits (Abdoli et al., salinity (Loy et al., 1996b) 2012) of Scartelaos tenuis have been are among the most important ecological f surveyed. However, there is no study to actors. compare different populations of this The Persian Gulf is a limited waterbody, species in a wide geographical range. linked to the Oman Sea via the narrow Geometric morphometrics (GM) is a Strait of Hormuz (Fig. 1); therefore, its method to compare the shape of organisms water transmission with the Oman Sea is (Rohlf and Marcus, 1993). Two- or three- restricted. The average depth of the www.SID.ir Archive of SID Iranian Journal of Fisheries Sciences 19(2) 2020 614 Persian Gulf is only ~35 m. The surface Jask 44) along the Iranian coasts of the water of the Persian Gulf experiences Persian Gulf and Oman Sea, in February broad seasonal temperature alterations and 2013 (Fig. 1, Table 1). The specimens are superior salinity readings because of the transferred to the Zoological Museum of low rainfall and high evaporation values Ferdowsi University of Mashhad (Yao, 2008). On the other part, the Oman (ZMFUM, Table 1). Specimens were Sea is widely connected to the Indian caught by hand net during low tide Ocean and much deeper than the Persian and preserved in 5% formalin. The Gulf (~1000 m). Enough circulation, direct urogenital papilla is pointed in males and connection with the Indian Ocean and spatulate in females, and this character is confined extension of shallow regions are used to sex determination of all fish three characters of the Oman Sea that (Miller, 1986; Ghanbarifardi et al., 2014a). make ecological conditions of To evaluate the trustworthiness of this this waterbody steadier than those of the method, 20 accidentally chosen specimens Persian Gulf (Reynolds, 1993). were also sex determined by dissection. This survey explores shape variation The left side of each sample was among populations of S. tenuis from five photographed using a Canon SX150 digital stations in the Persian Gulf, Strait of camera mounted on a bench-top camera Hormuz (Qeshm Island) and Oman Sea, stand. Fish images were converted into utilizing GM. TPS files with tpsUtil v. 1.38 (Rohlf, 2006), and 14 definable homologous Materials and methods landmarks (Fig. 2) were digitized from One hundred and ninety four specimens of each image using tpsDig v. 2.17 (Rohlf, S. tenuis (standard length > 70 mm) were 2013). Downloaded from jifro.ir at 8:41 +0430 on Saturday April 4th 2020 collected from five stations (Heleh 39, Asaluyeh 34, Chahoo 38, Dargahan 39, Table 1: Sampling coordinates, area, number and call numbers of Scartelaos tenuis specimens collected at five stations. Station Coordinates Area Specimens ZMFUM call numbers Heleh 29° 14.93' N 50° 40.72' E Persian Gulf 13 females, 26 males 104 hs-142hs Asaluyeh 27°26'N 52°40'E Persian Gulf 15 females, 19 males 3as-36as Chahoo 26° 41.47' N 55° 28.75' E Qeshm Island 18 females, 20 males 143qws-149qws (Strait of 18qws-49qws Hormuz) Dargahan 26° 58.39' N 56° 4.85' E Qeshm Island 19 females, 20 males 50qes-88qes (Strait of Hormuz) Jask 25° 33.85' N 58° 10.61'E Oman Sea 21 females, 23 males 100js-118js 74js-99js www.SID.ir Archive615 Ghanbarifardi of SID et al., Shape variation of the Indian Ocean slender mudskipper, Scartelaos tenuis from… Figure 1: Sampling stations. 1: Heleh, 2: Asaluyeh, 3: Chahoo, 4: Dargahan, 5: Jask. Landmark data from each specimen was Results aligned using Generalized Procrustes DFA method could not distinguish Analysis (GPA) for superimposition significant difference in shape between (Rohlf, 1999) with MorphoJ v. 1.04a females and males of S. tenuis (Table 2). (Klingenberg, 2011). The GPA method Therefore, all specimens of each translates, rotates, and scales all landmarks population were considered as a whole and to eliminate the non-shape variation and CVA was conducted. The thin-plate spline size factor (Zelditch et al., 2004). After (transformation grids) and lollipop plot Procrustes analysis, discriminant function along CV1 were used to depict the Downloaded from jifro.ir at 8:41 +0430 on Saturday April 4th 2020 analysis (DFA) was carried out with deformation in shape. The shape of the MorphoJ v. 1.04a to assess any shape snout (Landmark 1), the eye situation difference between sexes. Canonical (landmarks 3 and 4) and the position of the variate analysis (CVA) of landmark data first and second dorsal fins and anal fin was performed to evaluate any significant (landmarks 5, 6, 7, 8, 10 and 11) are dissimilarity in shape among fish samples. disfiguring for the most (Fig. 3). The CVA was conducted using SPSS 20.0 (© initial three canonical variates (CVs) IBM); for CVA, 34 specimens of each achieved 66.0%, 19.1%
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