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124 resultados encontrados para: TEMA: Moluscos
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Abundance, distribution, and secondary production of the apple snail Pomacea flagellate (Say, 1829) in Bacalar Lake, a tropical karstic system in southern Mexico
De Jesús Navarrete, Alberto (autor) ; Ocaña Borrego, Frank Alberto (autor) ; Oliva Rivera, José Juan (autor) ; Jesús Carrillo, Rosa M. de (autor) ; Vargas Espósitos, Abel Abraham (autor) ;
Contenido en: Studies on Neotropical Fauna and Environment Vol. 54, no. 1 (2019), p. 1–9 ISSN: 1744-5140
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Resumen en: Inglés |
Resumen en inglés

Pomacea flagellata is a gastropod conspicuous in freshwater environments, and represents a fishing resource. To assess their abundance, distribution, and secondary production, monthly samplings were carried out in Bacalar Lake from June 2012 to May 2013 at 12 sampling sites. In each site, three random transects were marked parallel to the shore. All snails on transect were collected and shell length and wet weight measured. The highest density occurred in September (1.27 ind.m−²), lowest in October (0.47 ind.m−²). Shell lengths ranged from 2 to 56 mm, with recruitment in January–March. Growth parameters were L∞ 59.50 mm, K 0.65.year−¹; the lifetime span was 3 years. Average biomass reached 5.57 wet g.m−² and secondary production was 6.025 wet g.m−². year-¹ ; annual renewal rate P/B 1.08. Highest abundance and secondary production was contributed by individuals between 31 and 41 mm in length. A potential biomass of 25.06 tons of snails was estimated in the lake. Snail densities, secondary production, and turnover were very low during the year, indicating that it is not viable to consider a commercial catch without affecting the population. A ban of 10 years is proposed, and aquaculture practices of snails are recommended to recover the resource.

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Capture efficiency of artificial lures in baited lines for mayan octopus, octopus maya, fishery in Campeche, Mexico
Markaida Aburto, Unai (autor) ; Méndez Loeza, Iván (autor) ; Rodríguez Domínguez, Almendra (autora) ;
Contenido en: Marine Fisheries Review Vol. 81, no. 1 (2019), p. 53-60 ISSN: 0090-1830
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Resumen en: Inglés |
Resumen en inglés

The Mayan octopus, Octopus maya, fishery from the Campeche Bank is the largest octopus fishery in the Americas and one of the largest worldwide. This fishery uses a large quantity of crabs, Brachyura, as bait, and these crustacean populations are heavily impacted. To investigate alternative lures we examined the efficacy of various artificial lures ranging from plastic crabs to jigs baited with fish during the 2012 and 2013 seasons. Artificial PVC “crab” lures showed the best yields. However, their performance was less effective than natural crab in all cases. A simple simulation showed that using these lures, harvests would decrease by 42–44% compared to using natural crab. We suggest the use of PVC crab combined with an organic compound that releases an attractive scent for octopus in further experiments.

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Comparison between the feeding habits of spotted eagle ray (Aetobatus narinari) and their potential prey in the southern Gulf of Mexico
Serrano Flores, Francisco (autor) ; Pérez Jiménez, Juan Carlos (autor) ; Méndez Loeza, Iván (autor) ; Bassos Hull, Kim (autor) ; Ajemian, Matthew Joseph (autor) ;
Disponible en línea
Contenido en: Journal of the Marine Biological Association of the United Kingdom Vol. 99, no. 3 (May 2019), p. 661-672 ISSN: 1469-7769
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Resumen en: Inglés |
Resumen en inglés

In the southern Gulf of Mexico, the spotted eagle ray (Aetobatus narinari) is the second most frequently caught batoid in small-scale fisheries off Campeche. Ecological aspects of this ray are unknown in this region, hampering the understanding of the relationship between its distribution and prey availability in the fishing area. In order to study the feeding habits of this batoid and characterize its potential prey in the study area, stomachs and intestines of 154 specimens (68 females and 86 males) were analysed. The results indicated that A. narinari near Campeche is a specialist and selective predator that feeds mainly on gastropods (92.7% IRI), with no significant differences in the diet found between sexes, size groups, or between stomach and intestine contents. In addition, the results indicated that the most important prey species in the diet were among the most common benthic species in three of the four sampling transects positioned in or adjacent to fishing areas for rays. These most important prey species were Strombus pugilis (53.33% IRI) and Americoliva reticularis (25.6% IRI). Other prey species included Lobatus costatus (5.6% IRI) and Petrochirus diogenes (3.6% IRI). This study suggests that this widely distributed ray species feeds in Campeche's coastal waters and that the study of its potential prey increases the understanding of ecological aspects of the species, which emphasizes the added importance of monitoring fishery impacts on prey species (e.g. the conch fishery off Campeche) to help support integrated assessment and management of fisheries.

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Biología reproductiva de Octopus hubbsorum Berry, 1953 en el corredor pesquero Santa Rosalía - Punta Chivato, BCS, México. / Evelyn Arías Cedeño
Arías Cedeño, Evelyn ; Arellano Martínez, Marcial (director) ; Markaida Aburto, Unai (director) ;
La Paz, Baja California Sur, México : Instituto Politécnico Nacional. Centro Interdisciplinario de Ciencias Marinas , 2018
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Resumen en: Español | Inglés |
Resumen en español

Octopus hubbsorumes la principal especie de pulpo capturada en el Pacifico mexicano, sin embargo, aún no cuenta con regulación pesquera. Santa Rosalía en Baja California Sur, es el puerto donde se registran los mayores desembarques anuales de pulpo. Las muestras mensuales provinieron de la captura comercial de septiembre del 2014 a agosto del 2015 en el corredor pesquero Santa Rosalía Punta Chivato. Se analizaron un total de 202 organismos cuyo rango de longitud dorsal del manto (LDM) fue 50-170 mm con un promedio y moda de 110 mm, mientras que, el peso total (PT) fluctuó entre los 150 y 1900 g con un promedio de 695 g y moda de 500 g, se les evaluaron algunos de los principales parámetros biológicos como la proporción sexual, ciclo reproductivo, época reproductiva, tallay peso a la madurez, condición durante la maduración gonádica, además de la interacción de la temperatura superficial del mar (TSM) con la actividad reproductiva. En la muestra total (0.6H:1M) y en agosto (0.22H:1M) y octubre (0.25H:1M) hubo significativamente más machos que hembras. El principal evento reproductivo de las hembras ocurre en junio-julio, coincidente con el máximo valor de TSM(30°C). En tanto que, la actividad reproductiva de los machos fue continuaa lo largo del año. El patrón ovárico fue sincrónico de acuerdo conla distribución del área proporcional de los ovocitos. De los tres índices reproductivos utilizados en este estudio, el IGS fue el que más se aproximó a identificar el estadio maduro y consecuentemente la actividad reproductiva, definida previamente por el análisis microscópico.

El índice de condición de las hembras no tuvo una tendencia clara con respecto a la maduración gonádica, lo que hace suponer que la energía para el desarrollo de la gónada no proviene principalmente de las reservas de la glándula digestiva. La talla y peso a la madurez de las hembras fue de 130 mm LDMy 960 g de peso total (PT), respectivamente. Mientras que, los machos presentaron signos de madurez a 100 mm LDM y 600 g PT. Se evaluaron los rasgos reproductivos y la estrategia de patrón de desove de O. hubbsorum, aportando información básica para un futuro manejo de la especie principal de pulpo del Pacífico mexicano.

Resumen en inglés

Octopus hubbsorum is the main species of octopus captured in western Mexico and Santa Rosalía is the port that generates the largest annual landings of octopus from all Baja California Sur (BCS). Based on commercial captures, a monthly sampling was carried out from September 2014 to August 2015 in the Santa Rosalía Punta Chivato fishing corridor. The 202 sampled octopuses ranged from 50 to 170 mm in mantle length (ML) and 150 to 1900 g in body weight (BW). We evaluated main biological parameters, sex ratio, reproductive event, reproductive indices, size and weightat maturity and condition. The total gender ratio was significantly different from 1:1 (0.6 H: 1m), however the monthly ratio was only significant in August and October. Mature males were found all year round and ovarian development was synchronous as part of their reproductive strategy.

The main reproductive peak occurs in June-July when the surface temperature of the sea reaches 30 ° C and the secondary peak in March-April at 20.7 °C. Based on the three indirect reproductive indices used in this study the IGS was the most appropriate to determine the stages of maturity previously defined by the microscopic analysis. According to the condition index, females apparently support the gonadic maturation of most of the diet. The size and weight at maturity of females was 130 mm LDM and 960 g PT, respectively and 100 mm and 600 g for males. The reproductive traits and reproductive strategy of O. hubbsorum was evaluatedto provide basic information for future management.

- Artículo con arbitraje
Diversidad de moluscos y crustáceos acuáticos en tres zonas en la cuenca del río Usumacinta, México
Trinidad Ocaña, Cinthia ; Juárez Flores, Juan (coaut.) ; Sánchez Martínez, Alberto de Jesús (coaut.) ; Barba Macías, Everardo (coaut.) ;
Contenido en: Revista Mexicana de Biodiversidad Supl., Vol. 89 (diciembre 2018), p. S65-S78 ISSN: 0187-6376
Resumen en: Español | Inglés |
Resumen en español

Los moluscos y crustáceos son importantes en la transferencia energética a niveles tróficos superiores, además de que indican la condición de los ecosistemas acuáticos. La diversidad de ambos grupos se determinó mediante muestreos diurnos en ambientes lóticos y lénticos en 3 zonas de la cuenca del río Usumacinta: planicie delta 1 y 2 (PD) y montaña fluvial (MF), abarcando los periodos hidrológicos de mínima inundación (mín-I), transición y máxima inundación (máx-I). Se registraron 236,250 organismos pertenecientes a 35 y 13 especies de moluscos y crustáceos, con 99% y 1% de la abundancia total, respectivamente. El 85% de abundancia de moluscos correspondió a Melanoides tuberculata y Tarebia granifera (especies invasoras), y el 67% de los crustáceos a Macrobrachium sp. y Penaeus duorarum. La diversidad máxima de moluscos por zona fue en PD2 (H' = 2.4); por ambiente en lóticos (H' = 2.9) y por temporada en mín-1 (H' = 2.2). Con respecto a los crustáceos, la diversidad fue máxima en la zona PD1 (H' = 2.2), en lóticos (H' = 2.0) y en máx-1 (H' = 2.1). La diversidad varió por la mayor heterogeneidad de los hábitats y la influencia marina.

Resumen en inglés

Mollusks and crustaceans are important in making energy available to upper trophic levels, besides, they are indicators of aquatic ecosystems condition. Diversity and abundance were determined by diurnal samples in lotic and lentic systems in 3 zones: delta 1 and 2 floodplain (PD) and fluvial highlands (MF) of the Usumacinta river basin during hydrological periods of minimum flooding, transition and maximum flooding. A total of 236,250 organisms was collected, which belong to 35 and 13 species of mollusks and crustaceans, with 99% and 1% of the total abundance, respectively. The 85% of the abundance of mollusks was represented by Melanoides tuberculata and Tarebia granifera (invasive species), whereas the 67% of the crustaceans was represented by Macrobrachium sp. and Penaeus duorarum. The highest diversity for mollusks was in zone PD2 (H' = 2.4); in lotic (H' = 2.9) and mín-1 season (H' = 2.2). Regarding the crustaceans, the highest diversity was in PD1 (H' = 2.2), in lotic (H' = 65 2.0) and in máx-1 season (H' = 2.1). The diversity varied due to habitat heterogeneity and marine influence recorded.

Resumen en: Inglés |
Resumen en inglés

The common octopus of the Veracruz Reef System (VRS, southwestern Gulf of Mexico) has historically been considered as Octopus vulgaris, and yet, to date, no study including both morphological and genetic data has tested that assumption. To assess this matter, 52 octopuses were sampled in different reefs within the VRS to determine the taxonomic identity of this commercially valuable species using an integrative taxonomic approach through both morphological and genetic analyses. Morphological and genetic data confirmed that the common octopus of the VRS is not O. vulgarisand determined that it is, in fact, the recently described O. insularis. Morphological measurements, counts, indices, and other characteristics such as specific colour patterns, closely matched what had been reported for O. insularis in Brazil. In addition, sequences from cytochrome oxidase I (COI) and 16S ribosomal RNA (r16S) mitochondrial genes confirmed that the common octopus from the VRS is in the same highly supported clade as O. insularisfrom Brazil. Genetic distances of both mitochondrial genes as well as of cytochrome oxidase subunit III (COIII) and novel nuclear rhodopsin sequences for the species, also confirmed this finding (0–0.8%). We discuss our findings in the light of the recent reports of octopus species misidentifications involving the members of the ‘O. vulgaris species complex’ and underscore the need for more morphological studies regarding this group to properly address the management of these commercially valuable and similar taxa.

Octopus, squid and cuttlefish: a visual, scientific guide to the oceans' most advanced invertebrates / Roger Hanlon, Mike Vecchione, Louise Allcock
Hanlon, Roger T. (autor) ; Vecchione, Michael (autor) ; Allcock, Louise (autor) ;
Chicago, Illinois, United States : University of Chicago Press , c2018
Clasificación: 594.5 / H35
Bibliotecas: Campeche
SIBE Campeche
ECO040007091 (Disponible)
Disponibles para prestamo: 1
Índice | Resumen en: Inglés |
Resumen en inglés

Largely shell-less relatives of clams and snails, the marine mollusks in the class Cephalopoda--Greek for "head-foot"--are colorful creatures of many-armed dexterity, often inky self-defense, and highly evolved cognition. They are capable of learning, of retaining information--and of rapid decision-making to avoid predators and find prey. They have eyes and senses rivaling those of vertebrates like birds and fishes, they morph texture and body shape, and they change color faster than a chameleon. In short, they captivate us. From the long-armed mimic octopus--able to imitate the appearance of swimming flounders and soles--to the aptly named flamboyant cuttlefish, whose undulating waves of color rival the graphic displays of any LCD screen, there are more than seven hundred species of cephalopod. Featuring a selection of species profiles, Octopus, Squid, and Cuttlefish reveals the evolution, anatomy, life history, behaviors, and relationships of these spellbinding animals. Their existence proves that intelligence can develop in very different ways: not only are cephalopods unusually large-brained invertebrates, they also carry two-thirds of their neurons in their arms. A treasure trove of scientific fact and visual explanation, this worldwide illustrated guide to cephalopods offers a comprehensive review of these fascinating and mysterious underwater invertebrates--from the lone hunting of the octopus, to the social squid, and the prismatic skin signaling of the cuttlefish.


Chapter One
Cephalopod Anatomy
Advanced Invertebrates
Inside the Cephalopod
Emperor Nautilus
Giant Pacific Octopod
Pharaoh Cuttlefish
Bigfin Squid
Japanese Flying Squid
Rough Glass Squid
Chapter Two
Phylogeny & Evolution
500 Million Years of Evolution
Nautilus—Living Fossil?
Evolution of Coleoids
The Buoyancy Conundrum
Cephalopods & Fishes: Convergent Evolution
On Dwarfs & Giants
Evolution & Climate Change
Fuzzy Nautilus
Common Blanket Octopus
Two-toned Pygmy Idiosepiid
Caribbean Reef Octopus
Flamboyant Cuttlefish
Analogous Bobtail Squid
Opalescent Inshore Squid
Eye-flash Squid
Chapter Three
Peculiar Lifestyles
Age & Growth
Cephalopods of Various Biomes
Humboldt Squid
Greater Argonaut
Striped Pyjama Squid
Thumbstall Squid
Agassiz’s Whiplash Squid
Pacific Warty Octopod
Balloon Dumbo Octopod
Chapter Four
Behavior, Cognition & Intelligence
Decision Making
Rapid Adaptive Coloration
Nature’s Best Camouflage
When Camouflage Fails
Super Fights for Mates
Sneaky Males & Sneakier Females
Evaluating Intelligence in Such Bizarre Animals
Common Octopus
Day Octopus
Mimic Octopus
Common European Cuttlefish
Giant Australian Cuttlefish
Broadclub Cuttlefish
Long-finned Inshore Squid
Caribbean Reef Squid
Chapter Five
Cephalopods & Humans
World Fisheries & Human Consumption
A Rich History of Biomedical & Biological Advances
Bio-inspired Materials Science & Engineering
Horned Octopod
Lesser Two-spotted Octopod
Southern Blue-ringed Octopus
Hawaiian Bobtail
Cape Hope Squid
Veined Squid
Jewel Squid
Sparkling Enope Squid
Notes on Contributors

Resumen en: Inglés |
Resumen en inglés

Mexican management plans currently consider just two octopus species in the official regulations, Octopus maya and Octopus vulgaris. However, the common octopus of the southwestern Gulf of Mexico has been recently identified as Octopus insularis, a species with unique biological and ecological characteristics. In accordance, we sampled O. insularis artisanal catches from the marine protected area of the Veracruz Reef System (VRS) between November 2017 and October 2018 and described its population structure and reproductive dynamics to provide basic biological information for the sustainable management of the species in the region. The 1,007 sampled octopuses ranged from 48 to 2,063 g in body weight (BW) and from 26 to 163 mm mantle length (ML). Most males were mature while the majority of females were immature. Although fishing closures in January, February and August precluded data gathering, most mature and juvenile specimens were registered in March and June respectively, thus, suggesting a year-long life cycle with spawning and recruitment peaks during winter and summer months respectively. Overall, sex ratios did not significantly shift from the expected 1:1, however males were significantly more abundant in December, which could be related to female spawning migrations to deeper waters. This was also supported by the generalized scarcity of mature and spent females in the catches. Males mature at a smaller size (590 g BW; 90 mm ML) than females (870 g BW; 108 mm ML). Although size at maturity is lower than the current minimum legal size for both sexes, most of sampled octopuses were smaller anyway, raising concern about the future sustainability of the fishery.

Tesis - Doctorado
Revisión y aspectos ecológicos de la familia Eulimidae Philippi 1853 (Gasteropoda) de las costas del Pacífico oriental tropical y el Atlántico mexicano / Norma Emilia González Vallejo
González Vallejo, Norma Emilia (autora) ; León González, Jesús Ángel de (director) ; García Garza, María Elena (secretaria) ; Rodríguez Almaraz, Gabino Adrián (vocal) ;
San Nicolás de los Garza, Nuevo León, México : Universidad Autónoma de Nuevo León. Facultad de Ciencias Biológicas. Subdirección de estudios de Posgrado , 2018
Clasificación: TE/594.301209726 / G6
Bibliotecas: Chetumal
SIBE Chetumal
ECO030008731 (Disponible)
Disponibles para prestamo: 1
Índice | Resumen en: Español | Inglés |
Resumen en español

Los caracoles agrupados en la familia Eulimidae Philippi, 1853 son en su mayoría ectoparásitos de casi todos los grupos de equinodermos (crinoideos, erizos, estrellas, ofiuros y pepinos de mar); pocas especies son endoparásitos, completando su desarrollo en el interior del hospedero. La lista preliminar en molluscabase.org incluye unas 1,000 especies de eulimidos comprendidas en 105 géneros válidos. Las conchas en su mayoría son blancas o transparentes y lisas, se consideran micro moluscos porque su longitud es menos de 5 mm. El dimorfismo sexual ha sido confirmado en algunos géneros, con machos enanos que son 1- 7 veces menores que las hembras. En México los estudios sobre taxonomía de eulimidos se restringen a listas de especies, algunas se refieren a estudios de aspectos ecológicos de las asociaciones simbióticas. El objetivo del presente trabajo fue revisar los eulimidos presentes a lo largo de las costas mexicanas, estandarizar las diagnosis de los géneros mejor definidos, para la elaboración de una clave, preparar un catálogo de las especies y estudiar algunos aspectos ecológicos de relaciones simbióticas con erizos y pepinos de mar en el Caribe mexicano. Se visitaron 13 museos nacionales y del extranjero para revisar materiales tipo y no tipo. Para la recolecta de ejemplares vivos, se visitaron las siguientes playas en el Pacífico, Pichilingue, y La Paz, BCS, Los Pinitos, Mazatlán, Sinaloa y La Tijera y San Rafaelito, Oaxaca, en el Golfo de México Isla Verde, playa del acuario Veracruz; Lerma, Campeche; En el Caribe mexicano Isla Mujeres, Cozumel, Majahual y Xahuayxol, QR, adicionalmente se revisaron colecciones con organismos preservados en alcohol. La revisión taxonómica de la familia Eulimidae, resultó en un catálogo que inlcuye 14 géneros y 45 especies, se describen tres nuevas especies.

Las descripciones y redescripciones en algunos casos, fueron por comparación con los 25 holotipos, 6 sintipos y 5 paratipos, depositados en los distintos museos, que sirvió para elaborar una lista sistemática y una clave dicotómica para los géneros presentes de ambas costas mexicanas. De los estudios sobre aspectos ecológicos, se reporta la relación de Melanella eburnea y el pepino de mar Actinopyga agassizii por primera vez para el Caribe mexicano. La especie Melanella conoidea, está asociado a tres especies de pepinos de mar H. floridana, H. grisea, y H. glaberrima, en algunos solo está adherido por la probóscis a un tubo pedal, en otros está inmerso en la piel de su huésped. Se reporta por primera vez la simbiosis del ectoparásito Vitreolina cf. colini sobre el ofiuro Ophiothrix suensonii en Cozumel, QR. Monogamus minibulla y Monogamus sp. son ectoparásitos del erizo rojo Echinometra lucunter, ambos despliegan estrategias distintas de adhesión al huésped y un patrón de color del manto variable, número de larvas y movimiento de las mismas diferentes, la concha no sirvió para separar las especies y un análisis molecular podría confirmar sus diferencias ecológicas. Sabinella troglodytes y Nanobalcis worsfoldi son ectoparásitos del erizo espinas de lápiz Eucidaris tribuloides, el primero modifica la espina formando una agalla para vivir en el interior, y el otro es un comensal de la base de las espinas. La taxonomía y la amplia distribución de S. troglodytes es analizada y discutida. De acuerdo con este estudio, la taxonomía y la ecología presentan un panorama aún incompleto, el interés a nivel internacional para resolver la taxonomía de la familia está en curso, nuevas publicaciones e información relacionada con la taxonomía y preferencias de asociaciones ecológicas están siendo generadas, estos estudios podrían ayudar mejorar el conocimiento del grupo.

Resumen en inglés

The snails grouped in the family Eulimidae Philippi, 1853 are mostly ectoparasites of almost all groups of echinoderms (crinoids, sea urchins, stars, ophiurids and sea cucumbers); few species are endoparasites, completing their whole development inside their host. The preliminary list on molluscabase.org includes some 1,000 eulimid species comprised in 105 valid genera. Shells are mostly white or transparent, and smooth, they are regarded as micro mollusks because their length is less than 5 mm. Sexual dimorphism has been confirmed for some genera, with dwarf males being 1-7 times smaller than females. In Mexico studies on the taxonomy of eulimids are restricted to a few lists of species, some publications refer to studies of ecological aspects of their symbiotic associations. The objective of this work was to review the eulimids present along Mexican coasts, to standardize the diagnoses of the best defined genera, for the elaboration of a key, to prepare a catalog of the species, and to study some ecological aspects of symbiotic relationships with sea urchins and holoturians from the Mexican Caribbean. Thirteen national or foreing museums were visited to review type and non-type materials. For the collection of live specimens, the following beaches were visited in the Pacific, Pichilingue, La Paz, BCS, Los Pinitos, Mazatlan, Sinaloa and La Tijera and San Rafaelito, Oaxaca, in Gulf of Mexico; Verde Island, Veracruz aquarium; Lerma, Campeche. For the Mexican Caribbean Isla Mujeres, Majahual and Xahuayxol, QR, additionally some collections with organisms preserved in alcohol were reviewed. The taxonomic revision of the Eulimidae family resulted in a catalog that includes 14 genera and 45 species, 3 new species are reported.

The descriptions and redescriptions in some cases, were by comparison with the 25 holotypes, 6 syntypes and 5 paratypes, deposited in the different museums, which served to develop a systematic list and a dichotomous key for genera present in Mexican coasts. From studies on ecological aspects, the relationship of Melanella eburnea and the holothuriancucumber Actinopyga agassizii is reported for the first time in the Mexican Caribbean. The species Melanella conoidea, is associated with three species of holothurians (H. floridana, H. grisea, and H. glaberrima), in some it is only attached by the proboscis to a pedal tube, in others it is immersed in the skin of its host. The symbiosis of the ectoparasite Vitreolina cf colini is reported for the first time on the brittle starfish Ophiothrix suensonii in Cozumel. Monogamus minibulla and Monogamus sp. are ectoparasites of the red sea urchin Echinometra lucunter, both deploy different strategies for attachching themselves to the host, and a variable mantle color pattern, number of larvae and movement of the same, the shell did not serve to separate the species, a molecular analysis could confirm their ecological differences. Sabinella troglodytes and Nanobalcis worsfoldi are ectoparasites of the spiny pencil sea urchin Eucidaris tribuloides, the former modifies the spine by forming a gall to live inside it, and the other is a commensal of the base of the spines. The taxonomy and wide distribution of S. troglodytes is analyzed and discussed. According to this study, the taxonomic and ecological panorama are still incomplete, the interest at the international level to improve the taxonomy of the family is ongoing, new publications and information related to taxonomy and ecological association preferences are being generated, these studies will improve the knowledge of the group.


Índice de Figuras
6.1 Objetivo General
6.2 Objetivos Particulares
7.1 Taxonomía
7.2 Morfología
Área De Estudio
Material Y Métodos
10.1 Taxonomía. Lista sistemática
10.2 Clave para la identificación a género
10.3 Catálogo de las especies (POT
10.4 Catálogo de las especies (GMyC)
10.5 Aspectos ecológicos
10.5.1. Pepinos de mar
10.5.2 Simbiosis Melanella eburnea y Actinopyga agassizii
10.5.3 Melanella conoidea (Kurtz y Stimpson)
10.5.4 Simbiosis de Vitreolina cf. colini y el ofiuro Ophiothrix suensonii
10.5.5 Monogamus minibulla ectoparásito de Echinometra lucunter
10.5.6 Monogamus sp.
10.5.7 Simbiosis de Sabinella troglodytes
10.5.8 Simbiosis de Nanobalcis worsfoldi
Resumen Biográfico
Anexo I
Anexo II

Tesis - Maestría
Variación morfológica y molecular en quitones (Mollusca: Polyplacophora) de Quintana Roo / Astrid Estefanía Te Gómez
Te Gómez, Astrid Estefanía ; Salazar Vallejo, Sergio I. (director) ; Martínez Arce, Arely (asesora) ; Carrera Parra, Luis Fernando (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2018
Clasificación: TE/594.27097267 / T4
Bibliotecas: Chetumal
SIBE Chetumal
ECO030008727 (Disponible)
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Resumen en español

La clase Polyplacophora o quitones son un grupo de moluscos poco conocidos que comprende unas 900 especies vivientes, de las cuales sólo 21 especies han sido registradas para las aguas del Mar Caribe mexicano. Algunas especies de quitones presentan amplia variación en algunos caracteres morfológicos como la coloración. Para este estudio se recolectaron organismos de cuatro localidades de Quintana Roo. Como parte de los resultados, se realizó un artículo cuyo objetivo fue presentar las especies encontradas con una descripción ilustrada y una clave de identificación, ya que no había un esfuerzo similar para la región. Las especies Callistochiton shuttleworthianus e Ischnochiton pseudovirgatus, previamente reportadas para Campeche y Yucatán, respectivamente, son nuevos registros para Quintana Roo. En un segundo capítulo se presentan descripciones completas de las especies junto con un estudio de variación de algunas características de las valvas y el cinturón, encontrando mayor variación en la ornamentación y coloración del tegumento de las valvas. En el tercer capítulo se muestra un análisis de distancia genética utilizando el marcador mitocondrial de la sección I del Citocromo Oxidasa (COI). Como se esperaba se encontró que los especímenes pertenecientes a una misma especie tuvieron muy baja divergencia genética (< 1 %), mientras que las divergencias interespecíficas fueron mayores (16 % – 39 %), por lo que el COI resultó útil para la discriminación de especies. En un cuarto y último capítulo se estudió el polimorfismo de color de las especies y su relación con el sustrato, encontrándose que la mayoría de las especies tienen semejanza con el sustrato que ocupan.


Capítulo 1. Quitones (Mollusca: Polyplacophora) del Caribe Mexicano, incluyendo una clave de identificación
Capítulo 2. Descripción y variación morfológica de los quitones del Caribe mexicano
Capítulo 3. Análisis molecular de los quitones del Caribe mexicano con base en el gen COI
Capítulo 4. Relación de coloración espécimen-sustrato