Hidrobiológica (E-Journal)
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Distribution of Sicydium Valenciennes 1837 (Pisces: Gobiidae) in Mexico and Central America
Get PDFGobies of the genus Sicydium Valenciennes are widespread in Mexico and Central America, but have a different distribution pattern on the Atlantic and Pacific slopes of the region. On the Pacific slope, where mountain ranges are found near the coast and the coastal plain is narrow, Sicydium is continuously distributed in rivers from Mazatlán, Sinaloa, Mexico, to central Panama. On the Atlantic slope, Sicydium is known from to three disjunct areas where coastal mountain ranges are present, central Mexico, northern Honduras, and northeastern Costa Rica and northern Panama, and has not been recorded from intervening areas with broad coastal plains. The amphidromous life history of Sicydium gobies may prevent them from occupying rivers flowing through broad coastal plains. Sicydium gobies spawn in rocky mountainous river reaches and their larvae drift downstream to the ocean where they begin feeding. In rivers crossing broad coastal plains the distance to the ocean is relatively long, and I hypothesize that newly hatched larvae might starve before they reached their marine feeding habitat or that post-larvae might starve on their return migration up river to adult habitat
First record of Axiopsis serratifrons (A. Milne Edwards, 1873) (Crustacea: Decapoda: Thalassinidea) in western Mexico
No full textThe thalassinid Axiopsis serratifrons (A. Milne Edwards, 1873) has been discovered in subtropical waters of the Gulf of California, Mexico, in the eastern Pacific. The large male specimen of this species, collected by scuba diving on rocky substrate, represents the first record north of Colombia along the coast of the Indo-Pacific and the morphology of its 4th and 5th thoracic stemite closely matches recent description by other authors
La Tribu Callithamnieae (Ceramiaceae, Rhodophyta) en la costa del Atlántico de México
Get PDFBibliographic revision of species from the Tribe Callithamnieae (Ceramiaceae, Rhodophyta) previously recorded from the Atlantic Mexico s shores was realized. We also checked herbariums specimens housed at different herbaria. In addition, some samples of Callithamnieae were carried out in twenty localities at the Atlantic coast of Mexico from 1983 to 2000. Analysis of this information showed us that this tribe contains three genera and five species. The best-represented genus of this Tribe was Aglaothamnion Feldmann-Mazoyer with three species. A. cordatum (Børgesen) Feldmann-Mazoyer is recorded from Cozumel island, Quintana Roo to Tampico, Tamaulipas, while A. boergesenii (Aponte et Ballantine) L Hardy-Halos et Rueness and A. herveyi (M. Howe) Aponte, Ballantine et Norris only were found in the Caribbean Sea. The distribution of Callithamnion Lyngbye and Seirospora Harvey, with one species each, is restricted to Quintana Roo and Veracruz. The taxa of this Tribe are not easily noticed because of their epiphytic habit, filamentous forms and small size. Morphological descriptions, drawings, distributional range, reproductive stage, substrate, tidal level, wave exposure, keys for determinations and specimens examinated are included.Se realizó una revisión bibliográfica y de ejemplares de herbario de los géneros y especies de la Tribu Callithamnieae (Ceramiaceae, Rhodophyta) que han sido registradas para la costa del Atlántico de México, así como material biológico recolectado en 20 localidades entre 1983 a 2000. Los resultados obtenidos indican que la Tribu Callithamnieae se encuentra representada por tres géneros y cinco especies. El género Aglaothamnion Feldmann- Mazoyer tiene tres especies, de las cuales A. cordatum (Børgesen) Feldmann-Mazoyer presenta la distribución más amplia desde Isla Cozumel, Quintana Roo hasta Tampico, Tamaulipas. Ejemplares de A. boergesenii (Aponte et Ballantine) L Hardy-Halos et Rueness y A. herveyi (M. Howe) Aponte, Ballantine et Norris se ubicaron solo en la región del Caribe. Callithamnion Lyngbye y Seirospora Harvey son uniespecificos y la distribución de ambos se restringe a Quintana Roo y Veracruz. Los integrantes de esta Tribu fácilmente pasan desapercibidos por su carácter filamentoso, hábito epífito y tamaño pequeño. Cada especie se acompaña con datos sobre su morfología, citología, estado reproductivo, distribución, esquemas, claves dicotómicas para su determinación y ejemplares representativos
The feeding habits of gafftopsail catfish Bagre marinus (Ariidae) in Paraiso Coast,Tabasco, Mexico
Get PDFThe gafftopsail catfish (Bagre marinus) is one of the species of most importance to fisheries in the Gulf of Mexico, particularly in the coastal region of Tabasco State, where it is captured abundantly almost all year round in shallow coastal zones. Although, there is neither ecological nor biological information about this species in the coastal zone of Tabasco State. This study aims to describe the feeding habits of gafftopsail catfish. Seasonal changes in the diet and its relation with reproductive period will also be discussed. Analyzes of stomachs contents of 430 individuals (97 females and 68 males for dry season, 100 females and 38 males for rainy season and 83 females and 44 males for nortes season) obtained from two commercial landings located in the Chiltepec municipality, Paraiso, Tabasco along one year (May 1996 to April 1997). The numerical percentage (%N), weight percentage (%W) and frequency occurrence indexes were calculated for the groups preys. These three indexes were comparing with the Kendall concordance coefficient, concluding that three indexes provide the same information about importance of prey inside diet, using the %F for posteriors analysis. Brachyurans were the more important preys inside the annual diet of species, reached a maximum frequency of occurrence during dry season (74.6 %F for females and 92.7 %F for males). Few seasonal changes in diet of both sexes were observed, with a progressive increase of occurrence of fishes and diminution of stomatopods and penaeid shrimps. No significant differences were finding in total diet between females and males. The variation of the proportion of fullness stomachs and fullness weight index along the year can be related with the reproductive behavior of species
Nuevos registros de escafópodos para las costas de Jalisco y Colima, México
Get PDFThe distribution of two species of scaphopods is extended south to the coast of Jalisco and Colima, México. Samples were taken with a Van Veen grab at depths between 41 and 75 m in medium sand, sandy silt and silty clay substrates. These species are: 1) Dentalium neohexagonum Sharp and Pilsbry, 1897, previouslyreported from Monterey Bay, California to Tiburón Island in the Gulf of California at depths of 7-256 m; it was collected in Jalisco at 72-75 m in sandy silt and silty clay; 2) Gadila fusiformis Pilsbry and Sharp,1898, recorded in Monterey, California, in San Carlos, Sonora and in Cabo San Lucas and the Gulf of California at depths of 7-365 m; it was collected in Colima and Jalisco, at 41 and 73 m in medium sand and silty clay substrata, respectively. The vertical distribution of another scaphopod species is also extended: Cadulus albicomatus Dall, 1890, previously registered between 733 and 3-050 m, it was collected in three localities at depths of 41, 48 and 73 m. The abundance and the frequency of occurrence of these species in the sampling stations is presented.Se informa sobre la ampliación del ámbito de distribución sur de dos especies de escafópodos hasta las costas de Jalisco y Colima, México. Las muestras fueron obtenidas con una draga Van Veen a profundidades entre 41 y 75 m en sustratos de tipo arena media, limo arenoso y limo arcilloso. Estas especies son: 1) Dentalium neohexagonum Sharp y Pilsbry, 1897, anteriormente con límites de distribución desde Bahía Monterey, California hasta Isla Tiburón, Golfo de California a profundidades de 7-256 m; se recolectó en tres localidades de la costa de Jalisco a profundidades de 72- 75 m en sustratos limo arenoso y limo arcilloso; 2) Gadila fusiformis Pilsbry y Sharp, 1898, antes registrada en Monterey, California, enSan Carlos, Sonora y en Cabo San Lucas y el Golfo de California a profundidades de 7-365 m; se recolectó en dos localidades de Colima y Jalisco, a profundidades de 41 y 73 m en sustratos de arena media y limo arcilloso, respectivamente. Además, se amplía la distribución vertical de Cadulus albicomatus Dall, 1890, anteriormente registrada entre los 733-3050 m, fue recolectada en tres localidades a 41, 48 y 73 m de profundidad. Se presentan valores de abundancia y frecuencia relativa en las estaciones para todas estas especies
Ensamble de macroinvertebrados acuáticos y estado ecológico de la microcuenca Dalí-Otún, Departamento de Risaralda, Colombia
Get PDFAquatic macroinvertebrates have been widely used as bioindicators of the response of aquatic ecosystems to human activities that affect them. Thus, their use as bioindicators is included in different protocols for the ecological assessment of streams. Goals. This study assessed the ensemble of aquatic macroinvertebrates in Dali Creek along with its ecological condition. Methods. Six surveys over seven reaches of the Creek were conducted from April 2012 through November 2013. The multihabitat method was used to collect the macroinvertebrates, and a visual assessment was used to study the state of the aquatic habitat and the riparian vegetation. Results. The results show that Aquatic macroinvertebrates are abundant and diverse, particularly at the reference points located upstream on the Dalí Creek and its tributary QR2. It was found significant differences between microhabitats sampled composition (K-W p<0.05). The BMWP index displayed a condition of high quality, with very clean water to clean condition. Similarly, the IHF index showed that all the sampling points present excellent condition except the QR3 point. Finally, the IMEERA index revealed that the ecological status of stream Dalí and QR2 tributary is very good to good; while for the sites QR3 the condition is very bad, despite the natural restoration process of the stream channel. Conclusions. The relationships between structural complexity of the physical habitat and the macroinvertebrates diversity are interesting aspects for studying streams in the Colombian Andes.Los macroinvertebrados acuáticos han sido ampliamente estudiados para evaluar la respuesta de los ecosistemas acuáticos a impactos antrópicos, razón por la cual hacen parte de diversos protocolos de valoración integral ecológica de corrientes. Objetivos. Este estudio evaluó el ensamble de los macroinvertebrados acuáticos presentes en la microcuenca Dalí, así como su estado ecológico estado ecológico de las corrientes. Métodos. Se realizaron seis muestreos entre abril de 2012 y noviembre de 2013, sobre siete tramos de las quebradas. Resultados. Se recolectaron macroinvertebrados mediante el método de multihábitats y se realizó la valoración visual del hábitat fluvial y bosque de ribera. Los macroinvertebrados acuáticos fueron abundantes y diversos, particularmente en los puntos de referencia ubicados aguas arriba sobre la quebrada Dalí y el tributario QR2. Se encontraron diferencias entre la composición por microhábitats muestreados (K-W; p< 0.05). El índice BMWP, reflejó una condición de calidad buena, con agua muy limpia a limpias; de igual manera el Índice IHF determinó que todas las estaciones presentan excelente condición, excepto la quebrada QR3. Finalmente, con el índice IMEERA la condición ecológica de Dalí y tributario QR2 es muy buena a buena, mientras que para la estación QR3 la condición es pésima, pese al proceso de restauración natural de su cauce. Conclusiones. Las relaciones entre la complejidad estructural del hábitat físico y la diversidad de los macroinvertebrados son un aspecto interesante para estudiar en los ríos andinos colombianos
La autodepuración en arroyos de planicie puede interrumpirse por el ingreso de desechos vitivinícolas según el biomonitoreo con macroinvertebrados
Get PDFMany streams of Uruguay suffer eutrophication and physical pollution due to intensive farming. The Colorado stream, in the coastal plain of the Rio de la Plata, is a particular case, which also receives winery debris. Macroinvertebrates give comprehensive information status of aquatic systems. Goals. To assess the overall environmental quality of the river Colorado, both water quality and the habitat and macroinvertebrate fauna was studied. Methods. Six sites were sampled: two on the Colorado stream and two on each headwater: Benitez and Rocha creeks. Results. Benitez creek receives effluents from wineries and presented high conductivity and low oxygen concentration. Rocha creek instead shows higher levels of nutrients and lower conductivity. We identified 787 invertebrates belonging to 3 orders of crustaceans and 6 of insects, 2 families of Diptera, 7 of molluscs and 2 of annelids. In Rocha creek taxonomic richness was below average. The study sites downstream in Rocha creek and Colorado river had richer and more equilibrated communities indicating a possible recovery. Conclusions. In all sites tolerant species to organic pollution dominated. Rocha creek suffers eutrophication, but still has some self-purification capacity downstream, while Benitez creek deteriorates perhaps from impact of wineries, which remains until it meets the Rocha creek, interrupting the recovery process.Muchos arroyos de Uruguay sufren el impacto de la eutrofización, así como alteraciones físicas, debido a la intensa actividad agropecuaria. Un caso especial es el del arroyo Colorado, localizado en la planicie costera del Río de la Plata, que también recibe desechos vitivinícolas. Los macroinvertebrados ofrecen información del estado integral de los sistemas acuáticos. Objetivos. Para evaluar la calidad ambiental integral del arroyo Colorado, se estudió tanto la calidad del agua como la del hábitat y la fauna de macroinvertebrados. Métodos. Se muestrearon seis sitios: dos en el arroyo Colorado y dos en sus nacientes, además de las cañadas Benítez y Rocha. Resultados. La cañada Benítez recibe efluentes de bodegas y presentó alta conductividad y poco oxígeno disuelto. La cañada Rocha, en cambio, mostró mayores niveles de nutrientes y menor conductividad. En total, se identificaron 787 invertebrados pertenecientes a 3 órdenes de crustáceos y 6 de insectos, 2 familias de dípteros, 7 de moluscos y 2 de anélidos. En la cañada Rocha la riqueza estuvo por debajo del promedio. Los sitios aguas abajo de la cañada Rocha y del arroyo Colorado presentaron comunidades más ricas y equilibradas, lo que indica una posible recuperación. Conclusiones. En los seis sitios dominaron especies de macroinvertebrados tolerantes a la contaminación orgánica. La cañada Rocha sufre eutrofización, pero aguas abajo presenta aún cierta capacidad de autodepuración, mientras que la cañada Benítez se deteriora tal vez por impacto de las bodegas; el deterioro se mantiene al reunirse con la cañada Rocha, lo cual interrumpe su recuperación
Evaluación de la calidad ecológica de los ríos en Puerto Rico: principales amenazas y herramientas de evaluación
Get PDFBackground. Stream ecosystems reflect human impacts on the environment. An understanding of the threats affecting these ecosystems and the development of tools to assess them is key for the conservation and management of aquatic ecosystems. Puerto Rico is an oceanic island with dense human presence and strong pressures over freshwater resources that result in the degradation of water bodies. Aquatic macroinvertebrates respond to pollution and are good indicators of anthropogenic impacts on streams. Goals. To describe major threats to the ecological condition of streams in Puerto Rico and introduce two biomonitoring indices based on macroinvertebrates that allow for the assessment of stream condition on the island. Methods. We proposed a standardized methodology for the use of the Biological Monitoring Working Party (BMWP) and Family Biotic Index (FBI) modified for Puerto Rico. Results. Major threats to aquatic ecosystems in Puerto Rico are associated with urbanization, water extraction, and untreated water discharges. For the elaboration of the indices, a tolerance value was assigned to each of the 87 taxonomic groups reported for Puerto Rico. Based on stream sampling, impact scales were developed for the BMWP-PR and FBI-PR. In addition, a standardized methodology is proposed to avoid sampling biases. Conclusions. The conservation status of rivers in Puerto Rico is relatively good compared with other tropical regions. The indices proposed (BMWP-PR, FBI-PR) are the first developed for the island with the goal of evaluating the ecological condition of streams. The indices are proposed as a starting point, future efforts should focus on the development of additional tools.Antecedentes. Los ecosistemas de río reflejan los impactos que los seres humanos tienen sobre el ambiente. Entender las amenazas a los que están expuestos estos ecosistemas y tener herramientas para evaluar estos impactos es esencial para la conservación y el manejo de los ecosistemas acuáticos. Puerto Rico es una isla oceánica con alta presencia humana y altas presiones de uso sobre sus recursos de agua dulce que resultan en impactos sobre los cuerpos de agua. Los insectos acuáticos responden claramente a la contaminación y son buenos indicadores de los impactos antropogénicos en ríos. Objetivos. Describir las principales amenazas a la condición ecológica de los ríos en Puerto Rico y proponer dos índices ecológicos basados en macroinvertebrados que permite la evaluación de la condición de los ríos en la isla. Métodos. Se propone una metodología estándar de muestreo para el uso adecuado de los índices Biological Monitoring Working Party (BMWP) e Índice Biótico de Familias (IBF) modificados para Puerto Rico. Resultados. Las mayores amenazas sobre los ecosistemas acuáticos de Puerto Rico están asociadas a la urbanización, la extracción de agua, y descargas de aguas residuales no tratadas. Para la elaboración de los índices, se le asignó un valor de tolerancia a cada uno de los 87 grupos taxonómicos de macroinvertebrados acuáticos reportados para Puerto Rico. Basados en muestreos, se desarrollaron escalas de impacto para el BMWP-PR y el IBF-PR. Además, se desarrolló una metodología estandarizada para evitar sesgos de muestreo. Conclusiones. El estado de conservación de los ríos en Puerto Rico es relativamente bueno comparado con otras regiones tropicales. Los índices propuestos (BMWP-PR, IBF-PR) representan las primeras herramientas desarrolladas para la isla con el objetivo de evaluar la condición ecológica de los ríos. Los índices se proponen como un punto de partida, futuros esfuerzos deben contemplar la elaboración de herramientas adicionales
Composición y distribución de la entomofauna acuática en arroyos de Tabasco, México
Get PDFBackground. Aquatic systems of Tabasco have been affected by various anthropogenic activities (Bueno-Soria, et al., 2005), however the knowledge of the aquatic insects is emerging, so it is important to know your current status in the state. Goals. To determine the distribution, abundance and diversity of aquatic insect fauna in streams of Tabasco. Methods. Samples were conducted at 38 locations during the years 2010 to 2013 in daytime and multihabitat effort. Results. Environmental variables as temperature, dissolved oxygen, conductivity and salinity showed significant differences between municipalities with p= 0.006. Principal component analysis ordination by municipalities showed 60% of the total variance explained by conductivity and dissolved oxygen for the first axis and the depth and the pH for the second factor. A total of 5,315 individuals, belonging to 11 orders and 56 families were collected. The highest diversity was recorded in Tacotalpa, Tenosique and Huimanguillo with H=2.87; H=1.09 and H=0.5, and richness were 42, 29 and 25 families respectively, and minimal richens was in Cardenas with six families. Tacotalpa and Tenosique represents 78% of the total density. In Tacotalpa dominated: Phylopotamidae, Chironomidae and Caenidae; Tenosique, Caenidae, Chironomidae and Coenagrionidae. While in Cardenas were Baetidae and Notonectidae. Conclusions. Highest riparian vegetation coberture presented in municipalities of Tacotalpa, Tenosique and Huimanguillo regulates insect composition. However the composition and structure of aquatic insects depends on multiple biotic and abiotic variables.Antecedentes. Los sistemas acuáticos de Tabasco han sido afectados por diversas actividades antropogénicas (Bueno-Soria, et al., 2005), sin embargo, el conocimiento de la entomofauna es incipiente, por tanto, es importante conocer su estado actual en la zona. Objetivos. Conocer la distribución, abundancia y diversidad de la entomofauna acuática en los arroyos de Tabasco. Métodos. Se realizaron muestreos puntuales, diurnos y multihábitat, con tres réplicas para cada arte de colecta, en 38 localidades durante los años de 2010 a 2013. Resultados. La temperatura, oxígeno disuelto, conductividad y la salinidad presentaron diferencias significativas entre municipios (p=0.006). La ordenación de los municipios mediante el análisis de componentes principales se dio primordialmente por la conductividad y el oxígeno disuelto para el primer eje y la profundidad y el pH para el segundo eje, con 60% de la variación total. Se colectaron 5,315 organismos, pertenecientes a 11 órdenes y 56 familias. La mayor diversidad se registró en Tacotalpa, Tenosique y Huimanguillo con una H=2.87; H=1.09 y H=0.5 y 42, 49 y 25 familias respectivamente. Tacotalpa y Tenosique representaron el 78% de la densidad total. En Tacotalpa dominaron: Phylopotamidae, Chironomidae y Caenidae; en Tenosique: Caenidae, Chironomidae y Coenagrionidae; mientras que Cárdenas registró solamente 6 familias, con dominancia de Notonectidae y Baetidae. Conclusiones. La mayor cobertura vegetal en Tacotalpa, Tenosique y Huimanguillo fue determinante para una mayor composición y diversidad de la entomofauna; sin embargo, su composición y estructura dependen de múltiples variables bióticas y abióticas
