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8 resultados encontrados para: AUTOR: Santana Piñeros, Ana María
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1.
Artículo
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Resumen en: Inglés |
Resumen en inglés

The oceanographic conditions of the Pacific Ocean are largely modified by El Niño (EN), affecting several ecological processes. Parasites and other marine organisms respond to environmental variation, but the influence of the EN cycle on the seasonal variation of parasitic copepods has not been yet evaluated. We analysed the relation between infection parameters (prevalence and mean intensity) of the widespread parasitic copepods Caligus bonito and Charopinopsis quaternia in the dolphinfish Coryphaena hippurus and oceanography during the strong 2015–16 EN. Fish were collected from capture fisheries on the Ecuadorian coast (Tropical Eastern Pacific) over a 2-year period. Variations of sea surface temperature (SST), salinity, chlorophyll a (Chl-a), Oceanic Niño Index (ONI), total host length (TL) and monthly infection parameters of both copepod species were analysed using time series and cross-correlations.

We used the generalised additive models for determine the relationship between environmental variables and infection parameters. The total body length of the ovigerous females and the length of the eggs of C. bonito were measured in both periods. Infection parameters of both C. bonito and Ch. quaternia showed seasonal and annual patterns associated with the variation of environmental variables examined (SST, salinity, Chl-a and ONI 1+2). Infection parameters of both copepod species were significantly correlated with ONI 1+2, SST, TL and Chl-a throughout the GAMLSS model, and the explained deviance contribution ranged from 16%-36%. Our results suggest than an anomaly higher than +0.5°C triggers a risen in infection parameters of both parasitic copepods. This risen could be related to increases in egg length, female numbers and the total length of the ovigerous females in EN period. This study provides the first evidence showing that tropical parasitic copepods are sensitive to the influence of EN event, especially from SST variations. The observed behaviour of parasitic copepods likely affects the host populations and structure of the marine ecosystem at different scales.


2.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

A new caligid copepod species, Pupulina mantensis sp. n. is described based on female and male specimens collected from the gills of the myliobatid elasmobranch Aetobatus cf. narinari Euphrasen, 1790 captured off the Pacific coast of Ecuador. The new species has a unique combination of characters that diverges from its known congeners, including: (i) weakly developed posterolateral processes on the genital complex; (ii) large spines on posterior surface of maxilliped basis (iii) abdomen slender, unsegmented, approximately 1/2 length and 1/5 width of genital complex; (iv) third exopodal segment of leg II with single long naked spine adjacent to minute, naked lateral spine; (v) velum of leg II with adjacent patch of denticles; (vi) caudal rami slightly less than half the length of genital complex; (vii) post-antennal process with robust, posteriorly directed tine, sclerotized stump posterolaterally, and two multi-sensillate papillae located on or near base of process (viii) post-oral process oval. The overall prevalence of P. mantensis sp. n. on its host was 37.5% and its mean abundance was 1.87 specimens per host. This is the second record of the genus Pupulina from Ecuador and the second record of Pupulina infecting rays of the Myliobatinae genus Aetobatus, of the subfamily Myliobatinae, after its discovery on A. ocellatus in Australia, thus confirming this expansion of its previously known host range to a new elasmobranch subfamily.


3.
- Artículo con arbitraje
Resumen en: Inglés |
Resumen en inglés

A new copepod species, Ergasilus curticrus n. sp. is described based on 14 female specimens collected from the gills of the characid teleost Bryconops giacopinii Fernández-Yépez, captured in the Vichada River Basin in Colombia. The new species has a unique combination of characters including: (i) 2-segmented endopods in legs 1 and 4; (ii) a semi-pinnate, falciform seta on the terminal segment of the first leg exopod; (iii) a 1-segmented fourth leg exopod; (iv) a reduced fifth leg with a single seta; and (v) a circular structure fused to a groove near the lateral margins of the second pedigerous tergite. Only two other known congeners have a 1-segmented leg 4 exopod, E. coatiarus Araujo & Varella, 1998 and E. iheringi Tidd, 1942. Among other characters, they differ from the new species by the lack of a semi-pinnate, falciform seta on the terminal exopodal segment of leg 1 and in the structure and armature of the fifth leg. The prevalence of E. curticrus n. sp. was 13.6% and its mean abundance was 0.4 specimens per host. This is the first new species of Ergasilus Nordmann, 1832 described from the Orinoco River Basin.


4.
Artículo
Caligus tenuifurcatus Wilson, 1937 (Copepoda, Siphonostomatoida), a parasite of Centropomid and Lutjanid teleosts from a coastal system of the Mexican Pacific
Suárez Morales, Eduardo ; Ho, Ju-shey (coaut.) ; Santana Piñeros, Ana María (coaut.) ;
Contenido en: Acta Parasitológica Vol. 53, no. 4, 397-403 ISSN: 1230-2821
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Resumen en: Inglés |
Resumen en inglés

Specimens of the parasitic siphonostomatoid copepod Caligus tenuifurcatus Wilson, 1937 were collected from the oral cavity of the yellowfin snook, Centropomus robalito Jordan et Gilbert; the white snook, C. viridis Lockington (Perciformes, Centropomidae), and the yellow snapper, Lutjanus argentiventris (Peters) (Perciformes, Lutjanidae), from a Pacific coastal system of Mexico. Infection was most intense on C. viridis. Caligus tenuifurcatus can be distinguished from its closest congener, C. bonito Wilson, by the body proportions and the basal ornamentation of the medial setae of the second exopodal segment of leg 1. Taxonomic illustrations are provided of both female and male. This is the third record of C. tenuifurcatus; hitherto, it was known only as a parasite of the roosterfish Nematistius pectoralis Gill (Perciformes, Nematistiidae) from Panama and the Gulf of California. Hence, the finding of C. tenuifurcatus as a parasite of two species of centropomids and one species of lutjanid represents a significant expansion of the known host range of this copepod in the eastern tropical Pacific.


5.
- Artículo con arbitraje
*En hemeroteca, SIBE-Chetumal
A new species and host range of Therodamas (Copepoda, Ergasilidae) from the eastern Tropical Pacific
Suárez Morales, Eduardo ; Santana Piñeros, Ana María (coaut.) ; González Solís, David (coaut.) ;
Contenido en: Crustaceana Vol. 81, no. 9 (Oct., 2008), p. 1107-1117 ISSN: 0011-216X
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
42112-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Chetumal
Resumen en español

Se describe detalladamente una especie nueva del género Therodamas Krøyer, 1863, uno de los tres géneros mesoparásitos de copépodos de la familia Ergasilidae. La descripción se basa en material recolectado en el robalo de aleta amarilla (Centropomus robalito Jordan & Gilbert, 1882) encontrado en un sistema lagunar de la costa mexicana del Pacífico Tropical Oriental. La nueva especie difiere de sus congéneres conocidos en la estructura general y proporciones del cuerpo y en detalles del armamento de las patas torácicas 1 y 4. Está más cercanamente relacionada con T. dawsoni Cressey, 1972 de Panamá, pero difiere de esta especie en varios caracteres que incluyen la presencia de procesos redondeados en las antenas, la ausencia de una espina en el primer segmento exopodal de la pata 4, la presencia de cuatro setas en el segundo segmento exopodal de la misma pata y de setas cortas y espiniformes en los segmentos terminales de las patas 2 y 3. Las especies Therodamas se han encontrado previamente en asociación con seis familias de teleósteos; el hallazgo de esta nueva especie en un miembro de la familia Centropomidae permite expandir el espectro de hospederos conocidos para este grupo de copépodos ergasílidos. Se confirma la baja especificidad de hospederos reconocida a nivel del género Therodamas; sin embargo, los datos disponibles sugieren que la especificidad es alta a nivel de especie. El género se restringe a la región Neotropical, pero no había sido registrado previamente al norte de América Central; su hallazgo en aguas tropicales del Pacífico de México marca un nuevo límite latitudinal para este género en la región Neotropical. Este es también el segundo registro de Therodamas en el Pacífico Tropical Oriental y el primero en aguas de México.

Resumen en inglés

A new species of the genus Therodamas Krøyer, 1863, one of the three mesoparasitic genera of the copepod family Ergasilidae, is described in detail. The description is based on material collected from the yellowfin snooker (Centropomus robalito Jordan & Gilbert, 1882) from a lagoonal system on the Mexican coast of the Eastern Tropical Pacific. The new species differs from its known congeners in the general structure and proportions of the body and details of the armature of legs 1 and 4. It is most closely similar to T. dawsoni Cressey, 1972 from Panama but differs from this species in several characters including the presence of rounded processes on the antennae, the lack of a spine on the first exopodal segment of leg 4, the presence of four setae on the second exopodal segment of the same leg, and short, spiniform setae on the terminal segments of legs 2 and 3. Species of Therodamas have been hitherto recorded from six teleost families; the finding of the new species from a member of the Centropomidae expands the known host range of this group of ergasilid copepods and confirms the low host specificity of the genus Therodamas, but data suggest that specificity is high at the species level. The genus is restricted to the Neotropical region, but it has not been previously reported from north of Central America; its finding in the tropical Pacific waters of Mexico marks a new latitudinal range for the genus in the Neotropics. It also represents the second record of Therodamas from the Eastern Tropical Pacific and the first notice of the genus in Mexican waters.


6.
Artículo
A new species of Ergasilus (Copepoda:Cyclopoida:Ergasilidae) from coastal fishes of the Mexican Pacific
Suárez Morales, Eduardo ; Santana Piñeros, Ana María (coaut.) ;
Contenido en: Folia Parasitologica Vol. 55 (September 2008), p. 224–230 ISSN: 0015-5683
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Resumen en: Inglés |
Resumen en inglés

A new species of the cyclopoid copepod genus Ergasilus von Nordmann, 1832 is described based on adult female specimens removed from the gills of the yellow snapper Lutjanus argentiventris (Peters) and the yellowfin snook Centropomus robalito Jordan et Gilbert from a Pacific coastal system of Mexico. The new species Ergasilus davidi sp. n. has a combination of characters that includes a two-segmented first leg endopod, a three-segmented fourth leg endopod, and the presence of a single seta on the first antennular segment. These characters are shared with 14 other congeners known mainly from Brazil and North America. It differs from these other species in the armature and ornamentation of legs 1 and 4, the shape of the body, and the structure and ornamentation of the antennae. Additional characters include a maxillar basis armed with blunt teeth, distally bent maxillular setae, and naked margins of first exopodal segments of legs 2-4. Previous regional records of Ergasilus sp. from both fish species are probably assignable to E. davidi. The prevalence and intensity of infection was estimated for both teleost species and agrees to previous data. Based on other records of the genus from several other teleost species in the surveyed area and adjacent zones of the Eastern Pacific, it is presumed that the new species could have a wider range of hosts. The new species represents the first Ergasilus described from Mexican waters of the Pacific. Overall, the genus remains poorly known in Central America and Mexico.


7.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

A new nematode species, Spirophilometra pacifica sp. n. (Philometridae), is described from gravid female specimens collected from the mouth cavity (the upper palate) of the fish (yellow snook) Centropomus robalito (Centropomidae, Perciformes) from the Chantuto-Panzacola system, Chiapas, in the Pacific coast of Mexico. Its morphology is very similar to that of the species originally described as Philometra centropomi Caballero, 1974, but the gravid females of S. pacifica are about three times longer (body length 11.63-18.17 mm); host species and the geographical distribution of both these forms also differ. Scanning electron microscope (SEM) examination of S. pacifica, used for the first time for a Spirophilometra species, confirmed the presence of numerous minute cuticular spines on the body surface, 14 cephalic papillae arranged in two circlets, and two small lateral papilla-like caudal projections. It is evident that some features of P. centropomi were incorrectly described (its types are not available) and this species is now transferred to Spirophilometra as S. centropomi (Caballero, 1974) comb. n.


8.
- Libro con arbitraje
El amanecer del siglo y la población mexicana (VI reunión nacional de investigación demográfica en México) / Fernando Lozano Ascencio, coordinador
Lozano Ascencio, Fernando (coordinador) ;
Distrito Federal, México : Universidad Nacional Autónoma de México. Centro Regional de Investigaciones Multidisciplinarias :: Sociedad Mexicana de Demografía , 2004
Clasificación: 304.60972 / A42
Bibliotecas: Villahermosa
Cerrar
SIBE Villahermosa
ECO050001554 (Disponible)
Disponibles para prestamo: 1
Resumen en: Español |
Resumen en español

El amanecer del nuevo siglo coincide con un conjunto de cambios en la población mexicana, que venían gestándose desde décadas atrás. El descenso de la mortalidad primero y la posterior disminución de la fecundidad, marcaron un cambio radical en el ritmo de crecimiento y en la estructura por edad de la población durante la última mitad del siglo XX. Lo paradójico es que esta “maduración” de la población mexicana no ha significado la eliminación de las graves desigualdades sociales y económicas que padece nuestra sociedad, ya que un creciente número de mexicanos continúa viviendo en condiciones de extrema pobreza, con empleos precarios y mal remunerados, y con la vista puesta en los Estados Unidos como una vía para obtener mejores oportunidades de empleo y de ingreso. Los textos reunidos en este libro constituyen un gran abanico de temas tradicionales de la demografía, y de nuevos enfoques en los estudios de población en México. Muestran no sólo el estado actual de la investigación sociodemográfica de nuestro país, sino también alertan sobre los grandes retos que enfrenta la sociedad mexicana en el combate a la vulnerabilidad demográfica y a la pobreza.