Ciencias Marinas最新文献

{"title":"A simple method for the genetic identification of commercially important species in the Opisthonema genus Gill, 1861 in the southern Gulf of California","authors":"Carlos Iván Pérez-Quiñonez, C. Quiñonez-Velázquez, F. García-Rodríguez","doi":"10.7773/CM.V46I3.3059","DOIUrl":"https://doi.org/10.7773/CM.V46I3.3059","url":null,"abstract":"espanolSe aplico la tecnica de reaccion en cadena de la polimerasa-polimorfismos de longitud de fragmentos de restriccion (PCR-RFLP, por sus siglas en ingles) para identificar 3 especies del genero Opisthonema ( Opisthonema bulleri , Opisthonema medirastre y Opisthonema libertate ) en la region sur del golfo de California. Se disenaron 2 pares de iniciadores especificos para amplificar el gen mitocondrial COI y se seleccionaron 3 enzimas de restriccion ( Hpa II, Rsa I y Ava II) para comparar los patrones de RFLP entre las especies. Diferentes niveles de polimorfismo fueron detectados entre las muestras. Se generaron perfiles de restriccion especificos faciles de analizar, los cuales pudieran distinguir de manera inequivoca las 3 especies objetivo. El enfoque llevado a cabo aqui usando PCR-RFLP es relativamente barato, rapido y robusto, y proporciona una tecnica util para la identificacion de las especies del genero Opisthonema. . EnglishThe polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) technique was used to identify 3 species in the genus Opisthonema ( Opisthonema bulleri , Opisthonema medirastre , and Opisthonema libertate ) in the southern Gulf of California. Two specific primer pairs were designed to amplify the COI mitochondrial gene and 3 restriction enzymes ( Hpa II, Rsa I, and Ava II) were selected to compare the RFLP patterns among the species. Different polymorphism levels were detected among samples. Easily analyzed specific restric- tion profiles were created, which differentiated unequivocally among the 3 target species. The approach undertaken here using PCR-RFLP is relatively cheap, fast, and robust, providing a useful technique for the identification of species in the genus Opisthonema. .","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43430672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of frequency and feeding time on growth, food utilization, somatic indexes and survival of juvenile white snook Centropomus viridis","authors":"María Isabel Abdo-de la Parra, L. E. Rodríguez-Ibarra, L. Ibarra-Castro, J. M. Martínez-Brown, G. Velasco-Blanco","doi":"10.7773/CM.V46I3.3089","DOIUrl":"https://doi.org/10.7773/CM.V46I3.3089","url":null,"abstract":"espanolEl robalo blanco del pacifico, \"Centropomus viridis\", se considera como una especie con alto potencial para su cultivo en Mexico por su alto valor economico y gran demanda en el mercado nacional. El crecimiento de los peces en cultivo depende, en gran medida, del regimen alimenticio, el cual incluye, frecuencia, tasa, tiempo y ritmo de alimentacion. El presente trabajo tuvo como objetivo determinar la frecuencia y la hora apropiada de alimentacion de juveniles de C. viridis en cultivo para optimizar el crecimiento y la supervivencia. Se utilizaron juveniles de 0.36 ± 0.01 g para evaluar de 1 a 5 frecuencias de alimentacion ad libitum por dia, con intervalos de 3 a 24 h, durante 6 semanas. Se determino el peso ganado (PG), la tasa de crecimiento (TC), la tasa especifica de crecimiento (TEC), la tasa de conversion alimenticia (TCA), la tasa de eficiencia alimenticia (TEA), el coeficiente de variacion (CV), el indice hepatosomatico (IH), el indice de grasa peritonea l (IGP) y la supervivencia (S) de los juveniles. La TC y la TEC de los juveniles alimentados 3 veces al dia, independientemente de las horas de alimentacion, no presentaron diferencias significativas con respecto a los resultados obtenidos para los juveniles alimentados 5 veces al dia. La TCA fue significativamente mayor y la TEA significativamente menor en los tratamientos con juveniles alimentados una sola vez al dia en comparacion con el resto de los tratamientos. No se encontraron diferencias significativas en CV, IH y S entre los tratamientos. El IGP solo presento diferencias significativas entre los juveniles alimentados 1 y 5 veces al dia. Con base en los resultados obtenidos en el presente estudio, se sugiere que los juveniles de C. viridis se alimenten 3 veces al dia, con un intervalo de 6 h entre cada toma. Estos resultados ayudaran en el desarrollo de la biotecnologia de cultivo de esta especie. EnglishThe Pacific white snook, \"Centropomus viridis\", is considered a species with high farming potential in Mexico due to its high economic value and overall demand in the national market. Growth in farmed fish is largely determined by the dietary regimen, which includes feeding frequency, rate, time, and cycle. The aim of the present study was to determine the feeding frequency and appropriate feeding time for farmed C. viridis juveniles in order to optimize growth and survival. Juveniles weighing 0.36 ± 0.01 g were used to evaluate 1 and up to 5 ad-libitum feeding frequencies per day, with 3 to 24-h intervals, for 6 weeks. Gained weight (GW), growth rate (GR), specific growth rate (SGR), food conversion ratio (FCR), feeding efficiency rate (FER), coefficient of variation (CV), hepatosomatic index (HI), peritoneal fat index (PFI), and survival (S) were determined for juveniles. Regardless of the feeding hours, no significant differences were found in the GR and SGR values between juveniles fed 3 times a day and those fed 5 times a day. FCR was significantly higher and FER sig","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45551052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shell dimension-weight relationships in the blood cockle Larkinia grandis (Bivalvia: Arcidae) on the southeastern coast of the Gulf of California","authors":"M. I. Sotelo-Gonzalez, C. Sepúlveda, R. Sánchez-Cárdenas, L. A. Salcido-Guevara, M. García-Ulloa, A. Góngora-Gómez, J. A. Hernández-Sepúlveda","doi":"10.7773/CM.V46I3.3145","DOIUrl":"https://doi.org/10.7773/CM.V46I3.3145","url":null,"abstract":"espanolEl berberecho \"Larkinia grandis\" es un recurso comercialmente importante en el golfo de California, pero hay poca informacion disponible acerca de esta especie. En este estudio, se evaluaron las interacciones entre el peso corporal (BW) y la longitud (SL), la altura (SH) y el ancho (SW) de la concha en una poblacion de L. grandis en el golfo de California, Mexico. Se recolectaron a mano 80 berberechos mensualmente, desde agosto de 2017 hasta julio de 2018, de cerca y/o debajo de los arboles de mangle, en la costa sureste del golfo de California. El intervalo de medidas de las conchas (SL = 142.00–44.57 mm, SH = 85.50–31.15 mm, SW = 76.56–32.03 mm) indica que la poblacion muestreada estaba dominada por especimenes adultos. Solo el coeficiente de variacion para BW exhibio alta dispersion (23%–45%). Las relaciones potenciales de BW con SL, SH y SW no fueron lineales. La interaccion mas fuerte se encontro entre BW y SW (R² = 0.934); la relacion BW–SW describio mejor el crecimiento de este arcido. Todas las relaciones entre la dimension y el peso de la concha fueron significativas (P ≤ 0.05), lo cual indica tanto crecimiento alometrico negativo (SL–SW y SH–SW) como positivo (SL–SH, BW–SL, BW–SH y BW–SW). Los valores de b oscilaron entre 0.8950, para la relacion LogSH–LogSW, y 2.6240, para la interaccion LogBW–LogSH. Esta informacion preliminar es util para desarrollar estrategias de conservacion y explotacion sostenible para esta especie de importancia economica en la region estudiada. EnglishThe blood cockle \"Larkinia grandis\" is a commercially important resource in the Gulf of California, but little information is available on this species. In this study, the interactions between body weight (BW) and shell length (SL), height (SH), and width ( SW) were evaluated in a L. grandis population in the Gulf of California, Mexico. Eighty cockles were hand-picked monthly from August 2017 to July 2018 near and/or under mangrove trees on the southeastern coast of the Gulf of California. The range of shell measurements (SL = 14 2.00–44.57 mm, SH = 85.50–31.15 mm, SW = 76.56–32.03 mm) indicates that the sampled population was dominated by adult specimens. Only the coefficient of variation for BW exhibited high dispersion (23%–45%). The potential relationships between BW and SL, SH, and SW were non-linear. The strongest interaction was found between BW and SW (R² = 0.934), with the BW–SW relationship best describing the growth of this ark clam. All shell dimension–weight relationships were significant (P ≤ 0.05), indicating both negative (SL–SW and SH–SW) and positive (SL–SH, BW–SL, BW–SH, and BW–SW) allometric growth. The b values ranged from 0.8950, for the LogSH–LogSW relationship, to 2.6240, for the LogBW–LogSH interaction. This preliminary information is useful for developing conservation and sustainable exploitation strategies for this species, which is of economic importance to this region.","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43420619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physiological assessment of 2 color strains of Crassiphycus corneus (J. Agardh) Gurgel, J.N. Norris et Fredericq (Gracilariales, Rhodophyta): Effects of temperature and irradiance","authors":"J. Jofre, N. Navarro, E. Plastino","doi":"10.7773/cm.v46i2.3074","DOIUrl":"https://doi.org/10.7773/cm.v46i2.3074","url":null,"abstract":"Crassiphycus corneus (J.Agardh) Gurgel, J.N.Norris et Fredericq (Gracilariales, Rhodophyta) is a species with high-quality and high yields of polysaccharides and is therefore an important agarophyte on the west coast of the Atlantic Ocean. On the northeastern coast of Brazil, the populations of this species are mostly composed of individuals of the wild red color strain and by some individuals of the green color strain, the latter being scarcely studied. This work characterizes and compares the physiological performance of the wild red strain and the green variant under different temperature and irradiance conditions in the laboratory. The results indicate that the green and red strains are similarly tolerant to low temperatures (18 oC) but intolerant to high temperatures (35 oC). Both strains exhibited the highest growth rate at 25 oC and high irradiance (500 μmol photon·m–2·s–1). Under these conditions, photosynthetic rate and pigment content were similar in both color strains, but growth rates were higher in the red strain. Despite this difference, it is important to highlight that the green strain showed a growth rate of over 10%, which indicates that it could be used for cultures aiming to obtain products with added value.","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41507733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fibropapillomatosis in free-ranging green sea turtles (Chelonia mydas) off the central coast of Veracruz, Mexico","authors":"Emilio A Suárez-Domínguez","doi":"10.7773/cm.v46i2.3043","DOIUrl":"https://doi.org/10.7773/cm.v46i2.3043","url":null,"abstract":"espanolLa fibropapilomatosis (FP) es una enfermedad neoplasica que afecta a las tortugas marinas en aguas tropicales. Los individuos juveniles de tortuga verde (Chelonia mydas) parecen ser los mas afectados por los tumores cutaneos, que no son malignos, pero dependiendo de su numero, tamano y ubicacion, pueden comprometer la supervivencia. La prevalencia de la FP en tortugas marinas ha incrementado en las decadas pasadas en zonas como Espirito Santo (Brasil) y Texas (EUA), pero en Mexico pocos casos han sido documentados a la fecha. Durante 2017–2018 se registro por primera vez una prevalencia de FP del 12.2% en tortugas de vida libre en el Parque Nacional Sistema Arrecifal Veracruzano, un area sujeta a la presion ambiental y la presion antropica. De acuerdo con el analisis histopatologico de una muestra de tejido, los tumores fueron consistentes con las caracteristicas de fibropapilomas. Los tumores no fueron severos (0.01–7.16 cm), pero la mayoria tuvo una apariencia verrugosa y se encontraron en las aletas y los ojos, lo que podria representar un riesgo potencial para la salud de los juveniles. Se recomienda continuar el monitoreo de esta poblacion, y la informacion aportada aqui puede servir de base para estudios futuros en aguas mexicanas del golfo de Mexico, en donde la FP no habia sido reportada aun. EnglishFibropapillomatosis (FP) is a neoplastic disease affecting marine turtles around the tropics. Juvenile green sea turtles (Chelonia mydas) seem to be the most affected by the cutaneous tumors, which are not malignant but depending on their number, size, and location, can hamper survival. FP prevalence in sea turtles has increased over the past few decades in areas such as Espirito Santo (Brazil) and Texas (USA), but in Mexico few instances have been documented to date. Here we report a 12.2% FP prevalence in free-ranging turtles captured during 2017–2018 in the Veracruz Reef System National Park, a previously unreported site in Mexico, which is subject to environ-mental and anthropogenic pressures. Histopathological analysis of one tissue sample revealed tumors were consistent with the characteristics of fibropapillomas. They were not severe (0.01–7.16 cm), but the majority had a verrucous appearance and were mainly found on the flippers and eyes, being potentially detrimental to the health of juvenile turtles. We recommend continued monitoring of this population, and the information provided here can serve as a baseline for future studies in this area of the Gulf of Mexico, where FP had not been reported.","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46196051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of the octopus fishery on the American horseshoe crab population in the Ría Lagartos Biosphere Reserve, Mexico","authors":"J. S. Gío, G. A. Ramírez, Héctor Javier Ortiz León, R. Bustillos, Carmen Olivia Rosas Correa, José Manuel Castro Pérez","doi":"10.7773/cm.v46i2.2992","DOIUrl":"https://doi.org/10.7773/cm.v46i2.2992","url":null,"abstract":"espanolSe ha documentado que la cacerolita de mar Limulus polyphemus se captura de forma ilegal para uso como carnada de Octopus spp. en algunas localidades de la peninsula de Yucatan, Mexico. Para conocer si la pesqueria de pulpo pudiese tener una influencia negativa en las poblaciones de este limulo, se muestrearon organismos de L. polyphemus 2 veces al ano, antes y despues del comienzo de la temporada anual de pulpo, durante 4 anos consecutivos (2015–2018) en Rio Lagartos y San Felipe, situados en la Reserva de la Biosfera Ria Lagartos (RBRL), Yucatan. Se trazaron cuadrantes perpendiculares a la vera del manglar y se midieron los parametros fisicoquimicos del agua (profundidad, temperatura, oxigeno disuelto, pH, salinidad y conductividad electrica), asi como la granulometria del sedimento marino (mediante el tamizado de Folk). Se registro el numero de individuos vivos, el numero de hembras y la longitud promedio. No se encontraron diferencias significativas en los parametros fisicoquimicos del agua ni en la sedimentologia registrada (P > 0.05). Los muestreos evidenciaron pocos organismos por sitioestudiado: 22 en Rio Lagartos y 24 en San Felipe, ambos resultados antes de iniciada la temporada de pulpo de 2017. En los muestreos poste-riores al inicio de la temporada de pulpo de 2018, solo se observaron 2 organismos en Rio Lagartos y ninguno en San Felipe. Los resultados evidenciaron una disminucion significativa en el numero de ejemplares vivos de L. polyphemus despues de iniciada la temporada de pulpo, asi como tambien una disminucion en la longitud promedio de los organismos, lo que sugiere un efecto negativo en las poblaciones de la cacero-lita de mar derivado de las actividades propias de la pesca del molusco. Se requieren mas estudios que integren otros factores fisicoquimicos, biologicos y socioeconomicos para dilucidar la potencial amenaza de esta pesqueria sobre las poblaciones de este limulo en la RBRL. EnglishThe American horseshoe crab, Limulus polyphemus, has been reported to be illegally caught for use as Octopus spp. bait in some localities of the Yucatan Peninsula, Mexico. To learn if the octopus fishery could be negatively influencing the limulus populations in the area,L. polyphemus individuals were sampled twice a year, before and after the annual octopus fishing season, over 4 consecutive years (2015–2018) in Rio Lagartos and San Felipe, both in the Ria Lagartos Biosphere Reserve (RLBR), Yucatan. Quadrants were drawn perpendicular to the mangrove edge, physicochemical parameters in the water (depth, temperature, dissolved oxygen, pH, salinity, and electrical conductivity) were determined, and granulometry of marine sediments was measured (Folk technique). The number of live specimens, number of females, and average length were recorded. No significant differences were found for the physicochemical properties of water or the recorded sedimentology (P > 0.05). Samplings revealed a low number of organisms per site: 22 in Rio Lag","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43149401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trophic interactions between the 11 most abundant demersal fish species on the Pacific coast of central Mexico","authors":"J. F. Ortega, E. G. Domínguez, G. G. Sansón","doi":"10.7773/cm.v46i2.3056","DOIUrl":"https://doi.org/10.7773/cm.v46i2.3056","url":null,"abstract":"espanolSe realizo la descripcion de la dieta, la estrategia alimenticia y las interacciones troficas de las 11 especies de peces demersales con mayor abundancia en la costa central mexicana del Pacifico durante 2 periodos, el calido y el frio. En total se recolectaron 4,547 estomagos, de los cuales 1,921 estomagos vacios fueron descartados. En el analisis de los contenidos estomacales fueron identificados 95 entidades alimenta-rias, que fueron agrupados en 70 categorias alimentarias pertenecientes a crustaceos, moluscos, peces, poliquetos y equinodermos. De acuerdo a los valores del indice de Smith y la alta diversidad de presas, la estrategia alimenticia mostrada por las 11 especies en ambas temporadas de estudio fue generalista-oportunista. Se registraron valores bajos en la superposicion de la dieta y solamente se encontraron pocos casos signi-ficativos de superposicion de la dieta en la interaccion entre algunas especies de rayas de la familia Urotrygonidae y los lenguados del orden Pleuronectiformes. La disponibilidad y abundancia de recursos presa en el ambiente y la generalizacion de la amplitud del nicho permiten la coexistencia de la comunidad demersal de depredadores de fondos blandos someros sin competencia evidente por los recursos troficos. EnglishWe describe the diet, feeding strategy, and trophic interactions between the 11 most abundant demersal fish species on the Pacific coast of central Mexico during both the warm and cold seasons. A total of 4,547 stomachs were collected, with 1,921 empty stomachs being discarded. According to the stomach content analysis, 95 prey items were identified and grouped into 70 food categories belonging to crusta-ceans, mollusks, fish, polychaetes, and echinoderms. The Smith index value and high prey diversity indicated that the 11 fish species exhibited a generalist opportunistic feeding strategy in both survey seasons. Low values of dietary overlap were recorded, and only a few significant cases of dietary overlap were found in the interaction between some rays (Urotrygonidae) and flatfish species (Pleuronectiformes). The availability and abundance of prey resources in the environment and the generalization of niche breadth allows the demersal predator community of the soft shallow bottoms to coexist without any evident competition for trophic resources.","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42635492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of partial replacement of fish meal and fish oil with vegetable products on the growth and muscle cellularity of juvenile shi drum, Umbrina cirrosa","authors":"María Dolores Ayala Florenciano, D. Erades, S. Villafranca, M. Arizcun","doi":"10.7773/cm.v46i2.30911","DOIUrl":"https://doi.org/10.7773/cm.v46i2.30911","url":null,"abstract":"Seven-month-old shi drum (Umbrina cirrosa) specimens (mean weight 18.98 g, mean length 11.80 cm) were classified into 2 groups, a control group (C) fed a standard diet and a vegetal group (V) fed a diet with partial replacement of fish meal and fish oil by vegetable products. The body and muscle parameters were studied on days 0, 27, and 62 of the experiment. On day 27, body length was similar in both groups, but body weight was significantly lower in group V than in group C. The transverse area of the white muscle was also significantly lower in V than in C. Hypertrophy was higher in C than in V, whereas hyperplasia was higher in V than in C. On day 62, the body parameters showed similar results to those found on day 27. Muscle cellularity was different from that found on day 27, since hypertrophy was higher in V than in C and hyperplasia was higher in C than in V. The feed conversion rate and specific growth rate were similar in both groups, but the daily intake rate was lower in V than in C. Therefore, it seems that the percentage of vegetables in the vegetal feed was excessively high and this caused less acceptance by the fish. The hepatosomatic, viscerosomatic, and intestinal length indices were similar in both groups. Survival was nearly 100% in both groups.","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46446825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gene expression plasticity in Pocillopora corals from 2 locations on the Carrizales Reef, Pacific coast of Mexico","authors":"Manuel A. Delgadillo Nuño, Marco A. Liñán Cabello, Erick Delgadillo Nuño, Clara E. Galindo Sanchez, E. C. Ituarte","doi":"10.7773/cm.v46i2.3062","DOIUrl":"https://doi.org/10.7773/cm.v46i2.3062","url":null,"abstract":"espanolActualmente, la mayor amenaza que enfrentan los corales escleractinios es el cambio climatico acelerado. Suponiendo que la mayoria de los escleractinios son incapaces de una respuesta de adaptacion a los rapidos cambios globales, una respuesta alternativa seria la plasticidad fenotipica, que se describe clasicamente como aclimatacion. Con el fin de establecer una linea base para el estudio de la aclima-tacion en los corales de la costa mexicana del Pacifico, en el presente trabajo evaluamos la plasticidad de la respuesta fisiologica y molecular de 36 colonias pertenecientes a 3 morfoespecies del genero Pocillopora (Pocillopora cf. capitata, Pocillopora cf. damicornis y Pocilloporacf. verrucosa), ubicadas en 2 sitios (este y oeste) del arrecife Carrizales. Los datos ambientales revelaron mayor incidencia de luz y concen-traciones mas altas de clorofila en las muestras de agua del sitio oeste, lo que sugiere la presencia de al menos 2 microambientes con mayor y menor luz en el arrecife. Como respuesta, las morfoespecies del sitio oeste mostraron una mayor expresion genica y diferencias significativas en el contenido de pigmentos, la densidad de endosimbiontes y los marcadores metabolicos (ARN, ADN y proteinas). Dada la preocupacion por el futuro de los arrecifes, consideramos que el presente estudio puede servir como linea base para el estudio de la plasticidad fisiologica y molecular de los corales Pocillopora de Mexico, y con ello se podran desarrollar estrategias de conservacion para las morfoespecies clave en los arrecifes coralinos de la costa mexicana del Pacifico. EnglishThe greatest threat scleractinian corals face today is accelerated climate change. Assuming that most scleractinians are incapable of genetic adaptation to rapid global changes, the alternative response would be phenotypic plasticity, which is classically described as accli-matization. With the purpose of establishing a baseline for the study of acclimatization in corals of the Pacific coast of Mexico, we assessed the molecular and physiological response of 36 colonies of 3 Pocillopora morphospecies (Pocillopora cf. capitata, Pocillopora cf. damicornis, and Pocillopora cf. verrucosa) located at 2 sites (east and west) on Carrizales Reef. Our results show higher incidence of light and chlorophyll concentrations in seawater samples from the west side, suggesting the presence of at least 2 microenvironments with more and less light in the reef. In response, coral morphospecies from the west side showed higher gene expression and significant differences in pigment concentra-tions, endosymbiont densities, and metabolic markers (RNA, DNA, and proteins). Given the present concern about the future of coral reefs, we consider that the present study could be used as a baseline for the study of the physiological and molecular plasticity of Pocillopora corals in Mexican waters, so conservation strategies could be developed for key morphospecies in coral reefs on the Pacific coast","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48370177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short-term changes in demersal fish assemblages exploited by an artisanal set gill net fishery in the Caribbean Sea (Colombia)","authors":"C. Salazar-Pérez","doi":"10.7773/cm.v46i1.3041","DOIUrl":"https://doi.org/10.7773/cm.v46i1.3041","url":null,"abstract":"A basic input for implementing ecosystem-based management measures is the knowledge on fish assemblages exploited by multispecies fisheries, such as the set gill net artisanal fishery in the Gulf of Salamanca (GoS), Caribbean Sea (Colombia), which catches a large \u0000number of high-value demersal species. Assemblages of this type were identified in this study, and significant differences ( \u0000P < 0.01) between \u0000sampling periods (2008 and 2013) and seasons were found by means of a two-way permutational multivariate analysis of variance. These \u0000results were consistent with those obtained with the principal \u0000coordinates analysis, indicating the occurrence of short-term structural changes in \u0000these assemblages. Interannual and seasonal variations in discriminant and typifying species were also identified using similarity percentages, \u0000and a decreasing trend in landing per unit effort was established by the bootstrap method. On the other hand, both the geographic location of \u0000the fishing grounds and the characterization of historical changes in the set gill nets used in the GoS were determined using \u0000the traditional \u0000ecological knowledge of local fishermen, who reported a decrease in mesh sizes. In conclusion, temporal variations could be related to changes \u0000in the gill nets, the fishing trip schedules, and the spatial distribution of fishing effort, all which occurred in response to the decrease in catch \u0000rates in traditional fishing grounds.","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44972414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}