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This study was conducted to examine the effects of different thermal conditions on the body shape of Aphanius arakensis, a eurythermal species in Iranian inland waters. The specimens were collected from Eshtehard Shoor River, Iran, transferred to the laboratory, and exposed to 22AaC, 25AaC, and 28AaC for 2 months. After this period, the specimens were photographed and landmark points were digitized on the 2D pictures. The extracted coordinates of the landmark points were superimposed using the generalized procrustes analysis to remove the effects of size, rotation, and translation. Canonical variate analysis and Mahalanobis distance followed by permutation multivariate analysis of variance were used to discriminate the shapes of the specimens exposed to the three temperatures. The results indicated that the shape of A. arakensis was significantly affected by temperature in both males and females. The specimens exposed to 25AaC and 28AaC had similar shapes but dissimilar shapes compared to those exposed to 22AaC. Those exposed to 22AaC had shorter head and tail regions and upper position of eyes. Males and females showed similar changes to temperature variations.

Temperature-Induced Phenotypic Plasticity in Aphanius arakensis Teimori, Esmaeili, Gholami, Zarei, & Reichenbacher, 2012 (Teleostei: Aphaniidae)