RESUMO
We report the complete mitogenome of Hydrophis cyanocinctus, which is 17,750 bp in size and includes 13 protein-coding (PCGs), 2 rRNA genes, 22 tRNA genes, and 2 control regions. PCGs, with 13 genes, is 11,427 bp in length. All PCGs use ATN as the typical start codon except COX1 with GTG; the TAG was found as the stop codon in ND1 and ND2, the AGA was found as the stop codon in COI and ND6, the TAA was found as the stop codon in ATP8, ATP6, ND4L, ND5 and Cytb; while other 3 PCGs stop with a single T. Phylogeny reconstructed using the Bayesian inference (BI) method with 13 PCGs indicates the presence of H. cyanocinctus at the root of Laticaudinae.
RESUMO
We report the complete mitogenome of Hydrophis curtus, which is 17,702 bp in size and includes 13 protein-coding (PCGs), two rRNA genes, 22 tRNA genes, and two control regions. PCGs, with 13 genes, are 11,261 bp in length. All PCGs use as the start codon ATN except ND1 (CTA) and COX1 (GTG); ATP8, ATP6, ND4L, ND5, and Cytb use the typical stop codon TAA; but COX2 and ND4 with a single T-. Phylogeny recon-structed using the Bayesian inference (BI) method with 13 PCGs indicates that H. curtus at the root of Laticaudinae.
RESUMO
In this paper, the complete mitochondrial genome of Eremias przewalskii (Squamata: Lacertidae) is reported, which is a circular molecule of 18,225 bp in size. The base composition of mtDNA is as follows: 30.3% A, 27.9% T, 27.9% C and 13.9% G. The genome consists of 13 protein coding genes, 22 transfer RNAs, 2 ribosomal RNA genes and one putative control region.
Assuntos
Genoma Mitocondrial , Lagartos/genética , Animais , Composição de Bases/genética , Pareamento de Bases/genética , Sequência de Bases , DNA Mitocondrial/genética , Genes MitocondriaisRESUMO
We incubated eggs of Calotes versicolor at four constant temperatures ranging from 24 degrees C to 33 degrees C to assess the effects of incubation temperature on hatching success, embryonic use of energy, and hatchling phenotypes that are likely to affect fitness. All viable eggs increased in mass throughout incubation due to absorption of water, and mass gain during incubation was dependent on initial egg mass and incubation temperature. The average duration of incubation at 24 degrees C, 27 degrees C, 30 degrees C, and 33 degrees C was 82.1 days, 60.5 days, 51.4 days, and 50.3 days, respectively. Incubation temperature affected hatching success, energy expenditure for embryonic development, and several hatchling traits examined, but it did not affect the sex ratio of hatchlings. Hatching success was lowest (3.4%) at 33 degrees C, but a higher incidence of deformed embryos was recorded from eggs incubated at this temperature compared to eggs incubated at lower temperatures. Most of the deformed embryos died at the last stage of incubation. Energy expenditure for embryonic development was, however, higher in eggs incubated at 33 degrees C than those similarly incubated at lower temperatures. A prolonged exposure of eggs of C. versicolor at 33 degrees C appears to have an adverse and presumably lethal effect on embryonic development. Hatching success at 24 degrees C was also low (43.3%), but hatchlings incubated at 24 degrees C did not differ in any of the examined traits from those incubated at two intermediate temperatures (27 degrees C and 30 degrees C). Hatchlings incubated at 33 degrees C were smaller (snout-vent length, SVL) than those incubated at lower incubation temperatures and had larger mass residuals (from the regression on SVL) as well as shorter head length, hindlimb length, tympanum diameter, and eye diameter relative to SVL. Hatchlings from 33 degrees C had significantly lower scores on the first axis of a principal component analysis representing mainly SVL-free head size (length and width) and fore- and hindlimb lengths, but they had significantly higher scores on the second axis mainly representing SVL-free wet body mass. Variation in the level of fluctuating asymmetry in eye diameter associated with incubation temperatures was quite high, and it was clearly consistent with the prediction that environmental stress associated with the highest incubation temperatures might produce the highest level of asymmetry. Newly emerged hatchlings exhibited sexual dimorphism in head width, with male hatchlings having larger head width than females.
