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Salazar-Silva P.,Colegio de Mexico | Salazar-Silva P.,Technological Institute of the Bay of Banderas
Journal of Natural History | Year: 2013

The genus Halosydna is a member of the family Polynoidae, comprising a group of polychaete annelids commonly known as scale worms. The main results in this study are the redescriptions of 14 species. Four new species are described from the Mexican Pacific. Halosydna leucohyba is newly recorded for the Mexican Caribbean, and H. leius and H. tuberculifer from the Mexican Pacific. The identities of some widely recorded species are clarified, among them H. brevisetosa, H. glabra, H. fuscomarmorata and H. parva. Finally, H. nebulosa and H. virgini are re-established as valid species and a dichotomous key for Halosydna specimens from the tropical eastern Pacific, Grand Caribbean, and other worldwide localities is included. http://www.zoobank.org/urn:lsid:zoobank.org:pub:AE52ECA9-090C-469B-9503-557B3DBB24BC. © 2013 Copyright Taylor and Francis Group, LLC. Source


Tortolero-Langarica J.J.A.,University of Guadalajara | Tortolero-Langarica J.J.A.,Technological Institute of the Bay of Banderas | Rodriguez-Troncoso A.P.,University of Guadalajara | Carricart-Ganivet J.P.,National Autonomous University of Mexico | Cupul-Magana A.L.,University of Guadalajara
Journal of Experimental Marine Biology and Ecology | Year: 2016

Hermatypic corals are an important sessile group in the benthic structure of tropical coral reef communities. Many organisms, in response to the environmental conditions, have developed different strategies of growth by modifying their morphologies and reproduction mode, as is the case of free-living colonies called coralliths. So far, important parameters such as calcification, growth rates and their relation with biotic and abiotic factors on coralliths have not been described. This study represents the first record of a corallith form of Porites lobata and provides information on its sclerochronology. Coral growth parameters of different coralliths were compared by measuring extension rate (cm y-1), skeletal density (g cm-3), calcification rate (g cm-2 y-1), average age (yr) and sphericity (S). The influence of the environment on corallith growth was assessed using water temperature as an abiotic factor and bioturbation by fish as a biotic factor. Analysis of annual density bands using X-ray densitometry provided a mean extension rate of 0.47 ± 0.23 cm y-1, skeletal density of 1.08 ± 0.14 g cm-3, and calcification rate of 0.51 ± 0.26 g cm-2 y-1. The results reveal differences in growth parameters between coralliths including a strong relationship of calcification rate with seawater temperature. In addition, direct and indirect bioturbations promoted the colony rotation resulting in a hemispherical form. Hence, the evidence suggests that scleractinian corals have developed an important growth strategy that allows the species to form new colonies and maintain successful coral reef communities through free-living corallith growth. © 2016 Elsevier B.V. Source


Tovar-Avila J.,Centro Regional Of Investigaciones Pesqueras Bahia Of Banderas | Gallegos-Camacho R.,Technological Institute of the Bay of Banderas
Hidrobiologica | Year: 2014

The estimated age (around 45 years) from vertebral growth band counts for the largest Sphyrna mokarran caught in the Gulf of California and Central Mexican Pacific in the last decades, locates it as the oldest elasmobranch reported to date in Mexican Pacific waters. The specimen studied was a mature female of approximately 550 kg of total weight and 424 cm of total length, caught by artisanal fishermen using longlines south of the archipelago of Islas Marías on November 11th 2010. The distance between growth bands showed fast growth during the first 10 years. Growth bands after the age of 38 were only visible in the corpus calcareum, though difficult to separate and count. The age estimated in the present study was similar to the maximum age reported for the species in the Atlantic Ocean and Gulf of Mexico, confirming the species as long lived. Source


Salazar-Silva P.,Colegio de Mexico | Salazar-Silva P.,Technological Institute of the Bay of Banderas | Carrera-Parra L.F.,Colegio de Mexico
Zootaxa | Year: 2014

Lepidonopsis humilis (Augener, 1922) has been considered as an amphiamerican species, widely recorded in both the Grand Caribbean region and the Tropical Eastern Pacific. Based on type material and additional materials, L. humilis is redescribed herein and its distribution clarified and restricted. Furthermore, the identity of specimens from the Mexican Pacific is clarified and a new species L. barnichae sp. nov. is described. This species is characterized by conical macrotubercles with slightly curved tips; all elytra with a tuft of papillae on the surface, isolated from the marginal papillae; and the second segment dorsally projecting over the prostomium as a small lobe. Additionally, there is a 17.6% genetic divergence in the nucleotide sequence variation of COI between L. humilis and L. barnichae sp. nov., which supports the morphological differences observed. Thus, L. humilis does not have an amphiamerican distribution but is restricted to the Gran Caribbean region; whereas the specimens from the Tropical Eastern Pacific belong to the newly described species L. barnichae sp. nov. A key to the three known species of Lepidonopsis is included. Copyright © 2014 Magnolia Press. Source


Hart C.E.,University of Guadalajara | Ley-Quinonez C.,National Polytechnic Institute of Mexico | Maldonado-Gasca A.,Technological Institute of the Bay of Banderas | Zavalanorzagaray A.,National Polytechnic Institute of Mexico | Alberto Abreu-Grobois F.,National Autonomous University of Mexico
Herpetological Conservation and Biology | Year: 2014

We analyzed relative abundance of nesting Olive Ridley Turtles, Lepidochelys olivacea, on El Naranjo beach, Mexico during 1993–2010, as well as seasonal and spatial distribution of nesting, size of nesting females, and hatching success of nests incubated artificially in polystyrene boxes. El Naranjo beach is located in Bahia de Jaltemba, Nayarit, Mexico where a local non-governmental organization protects a total of 8.3 km of coastline on the north side of the bay. A total of 2,571 nests were protected ex situ with a mean annual 144.5 ± 77.0 (mean ± SD) protected nests (range: 48–267), and 9,457 ± 5,424, hatchlings released (range: 1,850–23,467). During the months of beach monitoring (June-November) significant differences were observed in number of nesting events per month, with maximum nesting occurring between August–October. A total of 57 nesting females were measured during 2009 (n = 18) and 2010 (n = 39). Mean curved carapace length and width was 65.5 cm and 70.7 cm, respectively. Overall hatching success was a relatively high 74.7%. We recommend further research into artificial methods of incubation as this can be an important option in maintaining some populations of sea turtles. © 2014. Catherine Hart. All rights reserved. Source

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