Range expansion of the genus Sicydium (Teleostei: Gobiidae) to coastal mountain streams of southwestern Ecuador and possibly northwestern Peru

We report collections of several specimens of Sicydium in 2013 and 2014 from the Jubones and Santa Rosa Rivers in southwestern Ecuador. These collections substantially expand the known range of the genus southward. The specimens are tentatively identified as Sicydium cf. rosenbergii based on their morphology. Small differences in morphology among specimens from the two rivers are noted, as are discrepancies with the type description. A museum database search uncovered two additional records of the genus south of their previously recognized range including one record from northwestern Peru

Caracterización de la ictiofauna dentro la sub Cuenca del río Llaviuco

El estudio se realizó dentro la Subcuenca del río Llaviuco, con el objeto de establecer un inventario de las especies de peces que habitan en estos cuerpos de agua. Los resultados revelan tres especies de peces a saber: Salmo trutta (poco común); Oncorhynchus mykiss: (Poco común); y la única especie endémica Astroblepus ubidiai: (Raro). Además, se consideran índices y variables ambientales para determinar la salud del ecosistema acuático.The study was done in the river Llaviuco watershed with the objective of establishing an inventory of species of fish that inhabit these bodies of water. The results reveal three species of fish: Salmo trutta (fairly common); Oncorhynchus mykiss: (fairly common); and the only endemic species Astroblepus ubidiai: (rare). Furthermore, indices and environmental variables are considered in order to determine aquatic ecosystem health

Range expansion of the genus Sicydium (Teleostei: Gobiidae) to coastal mountain streams of southwestern Ecuador and possibly northwestern Peru

We report collections of several specimens of Sicydium in 2013 and 2014 from the Jubones and Santa Rosa Rivers in southwestern Ecuador. These collections substantially expand the known range of the genus southward. The specimens are tentatively identified as Sicydium cf. rosenbergii based on their morphology. Small differences in morphology among specimens from the two rivers are noted, as are discrepancies with the type description. A museum database search uncovered two additional records of the genus south of their previously recognized range including one record from northwestern Peru

Parallel Body Shape Divergence in the Neotropical Fish Genus Rhoadsia (Teleostei: Characidae) Along Elevational Gradients of the Western Slopes of the Ecuadorian Andes

Morphological data collected from specimens of Rhoadsia spp. (Teleostei: Characidae) in western Ecuador. Excel file with individual standard length (SL), body depth (BD), size-adjusted fineness ratio (Adj_FR), and size-adjusted canonical variates analysis scores on axes 1 and 2 (Adj_CV1, Adj_CV2)

Comparison of the outline of the consensus configuration for the <i>R</i>. <i>altipinna</i> Guayas/Other samples showing the shape difference relative to the consensus configuration for the <i>R</i>. <i>minor</i> Mindo sample (type locality, E6), which is shaded in gray.

<p>Analysis conducted using Thin-plate spline version 1.2. Fins and eyes are approximate and included only for reference to facilitate interpretation of body shape variation.</p

Genetic networks constructed using parsimony analysis in Network 5.0.0.0.

<p>Sizes of the circles are proportional to the number of specimens included. A) Network for COI haplotypes. B) Network for S7 intron alleles.</p

<i>Rhoadsia</i> spp. from western Ecuador.

<p>A) Representative specimen of <i>R</i>. <i>altipinna</i> from the Guayas River drainage (Río Palenque, FMNH-79080). B) Holotype of <i>R</i>. <i>minor</i> from Mindo in the upper Esmeraldas drainage (CAS-62221).</p

Genetic diversity of COI and S7i2 genes.

<p>N is the number of specimen sequenced per sample and per gene, H is the number of COI haplotypes, H_d is haplotype diversity, H_p is the number (and percentage) of private haplotypes, A is the number of alleles, A_e is the effective number of alleles, and A_p is the number (and percentage) of private alleles.</p

Variation in mean size-adjusted fineness ratio with elevation with samples coded by drainage.

<p>Fineness ratio is a measure of body elongation with larger numbers indicating more streamlined bodies. Error bars are standard errors of the mean.</p