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21 resultados encontrados para: AUTOR: Franco Gordo, María del Carmen
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1.
Artículo
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Seasonal variability of stable isotope values and niche size in tropical calanoid copepods and zooplankton size fractions
Kozak, Eva Rose (autora) ; Franco Gordo, María del Carmen (autora) ; Godínez Domínguez, Enrique (autor) ; Suárez Morales, Eduardo (autor) ; Ambriz Arreola, Israel (autor) ;
Contenido en: Marine Biology Vol. 167, no. 3, article number 37 (March 2020), p. 1-13 ISSN: 1432-1793
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Resumen en: Inglés |
Resumen en inglés

The seasonal variability of stable isotope values (δ15N and δ¹³C), ∆15N values, and niche width of calanoid copepod species, three zooplankton size fractions and seston were assessed from samples obtained monthly between January and December 2012 at a coastal sampling site in the Eastern Tropical Pacific off Mexico (19°09′03′′ N, 104°44′50′′ W). Twenty calanoid copepod species were analyzed, 15 of which were sampled in both the cool, productive ‘mixed’ period and the warm, oligotrophic ‘stratified’ period. While copepod δ15N and ∆15N values were higher during the mixed period, seston δ15N values did not differ between periods. The δ¹³C values indicated a seasonal difference between a priori-defined groups of oceanic and coastal copepod species. The seasonal variations of both the isotopic niche (Bayesian ellipses) values and Layman metrics in tropical copepods and zooplankton fractions suggested an opportunistic feeding strategy responding to the local coupled physical–biological seasonal processes. During the productive mixed period, the trophic web was more robust and stable, and a wider niche was observed. Contrary to commonly reported responses to environmental conditions, we found a more complex mesozooplankton food web during the productive period and a shorter web during the oligotrophic period, highlighting the importance of researching trophic dynamics in coastal tropical ecosystems.


2.
- Artículo con arbitraje
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Seasonal succession of tropical community structure, abundance, and biomass of five zooplankton taxa in the central Mexican Pacific
Ambriz Arreola, Israel ; Gómez Gutiérrez, Jaime (coaut.) ; Franco Gordo, María del Carmen (coaut.) ; Plascencia Palomera, Viridiana (coaut.) ; Gasca, Rebeca (coaut.) ; Kozak, Eva Rose (coaut.) ; Lavaniegos Espejo, Bertha Eugenia (coaut.) ;
Contenido en: Continental Shelf Research Vol. 168 (September 2018), p. 54-67 ISSN: 0278-4343
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Resumen en: Inglés |
Resumen en inglés

The seasonal succession of species community structure, abundance and carbon biomass of five zooplankton taxa (Copepoda, Euphausiacea, Chaetognatha, Amphipoda and fish larvae) and their variability during different oceanographic conditions was investigated on the continental shelf of the central Mexican Pacific (19°N, 105°W) during a monthly time-series (1996–1998). These zooplanktonic taxa included 291 species, with maximum species richness during El Niño 1997–98, when 54 tropical oceanic species invaded the continental shelf. This typical offshore community was advected onshore by the anomalous intrusion of Subsurface Equatorial water mass which caused +7 °C temperature anomalies. Nineteen species comprised the bulk of the abundance (91%) and biomass (87%) of the five zooplankton taxa. Multivariate statistical analysis revealed four species assemblages associated with distinct oceanographic conditions: (1) mixed water column period (upwelling; February–June, non-El Niño period) characterized by high abundance and carbon biomass of omnivorous zooplankters (copepods Subeucalanus subcrassus, Centropages furcatus, Canthocalanus pauper, Temora discaudata, and Subeucalanus subtenuis, euphausiid Euphausia distinguenda, and fish larvae Bregmaceros bathymaster); (2) stratified water column period (July–January, non-El Niño period) with low-moderate abundance and biomass of the predominant species of the first group plus the euphausiid E. lamelligera, the chaetognaths Flaccisagitta enflata and Zonosagitta bedoti, and the tropical amphipod Hyperioides sibaginis; and (3 and 4) two highly diverse assemblages associated with El Niño-stratified conditions and post El Niño (July 1997–December 1998).

These last two assemblages were distinguished by a high numerical dominance of carnivores (F. enflata, Z. bedoti, and H. sibaginis) and a pronounced decline of abundances of omnivore copepods, euphausiids, and fish larvae. Both the seasonal upwelling dynamics and the interannual-scale El Niño events shaped the tropical zooplankton community structure succession of this neritic ecosystem. The local community structure modulates the function and productivity of this ecosystem, which sustains regional fisheries and ecotouristic activities. More frequent, intense or even longer El Niño events may significantly decrease zooplanktonic carbon biomass and trophic transfer through the neritic epipelagic food web, resulting in impoverishment of the shelf biota with negative economic implications.


3.
Artículo
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Annual egg production rates of calanoid copepod species on the continental shelf of the Eastern Tropical Pacific off Mexico
Kozak, Eva Rose (autora) ; Franco Gordo, María del Carmen (autora) ; Palomares García, Ricardo (autor) ; Gómez Gutiérrez, Jaime (autor) ; Suárez Morales, Eduardo (autor) ;
Contenido en: Estuarine, Coastal and Shelf Science Vol. 184 (January 2017), p. 138–150 ISSN: 0272-7714
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Resumen en: Inglés |
Resumen en inglés

We provide the first estimations of calanoid copepod egg production rates (EPR) in the Eastern Tropical Pacific over an annual cycle (January–December 2011). Gravid females were collected twice monthly and incubated for 12 h without food to estimate EPR, weight-specific fecundity (Gf), spawning success (SS, percentage of females to spawn out of the total species incubated per month and season) and egg hatching success (EHS). This study reports the average EPR of 10 species and the monthly EPR and Gf of four planktonic calanoid copepods (Centropages furcatus, Temora discaudata, Pontellina sobrina, and Nannocalanus minor) that spawned with enough frequency to infer their seasonal reproductive patterns. These species showed distinct seasonal reproductive strategies. Most copepod species spawned sporadically with large EPR variability, while three copepod species reproduced throughout the year (C. furcatus, T. discaudata and P. sobrina) and N. minor spawned only during the mixed period (Feb–May). The four species had relatively similar average EPR (C. furcatus 16, T. discaudata 18, P. sobrina 13, and N. minor 12 eggs fem−¹ day−¹). These are the first EPR estimations of P. sobrina and its previously known reproductive period is expanded. A Canonical Correspondence Analysis (CCA) was used to analyze EPR and species abundance of all calanoid copepods (40 spp.) collected throughout the time series in relation to temperature, salinity, mixed layer depth (MLD), dissolved oxygen, and chlorophyll a (Chl-a) concentrations to identify the variables that best explained the copepod abundance variability.

Temperature, Chl-a, and salinity had the strongest effect on the biological variables, linked to seasonal and episodic upwelling-downwelling processes in the surveyed area. As a result of moderate upwelling events and seasonal variation of environmental conditions, it appears relatively few species are capable of maintaining continuous reproduction under the relatively higher temperatures and strong fluctuations of food availability that exist in this coastal habitat of the Eastern Tropical Pacific.


4.
Tesis - Doctorado
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Acoplamiento de la abundancia, la tasa de producción de huevos, y la estructura trófica de copépodos (Calanoida) tropicales a la variabilidad hidrológica en la costa del Pacífico central mexicano / Eva Rose Kozak
Rose Kozak, Eva ; Suárez Morales, Eduardo (codirector) ; Franco Gordo, María del Carmen (codirectora) ;
Cihuatlán, Jalisco, México : Universidad de Guadalajara. Centro Universitario de la Costa Sur , 2014
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Resumen en español

Se investigó la respuesta de la abundancia de la comunidad, la tasa de producción de huevos, y la posición trófica de copépodos calanoides a la variabilidad hidroclimática en el Pacífico Central mexicano (PCM) (19° N, 105° W). En la región del PCM la hidrología de la columna de agua tiene una estacionalidad marcada, que se conforme con periodos de surgencias (febrero-mayo, frío) y hundimiento (julio-noviembre, cálido), intercambiados con periodos transicionales. El primer capítulo describe la composición taxonómica de los copépodos calanoides encontrados en el área de estudio en los periodos 1996-1998 y 2011. En total se registraron 63 especies del orden Calanoida. Durante el periodo de los años 1996-1998, se registraron 60 especies, siendo las más abundantes Subeucalanus subcrassus (25.8%), Centropages furcatus (23.5%), Canthocalanus pauper (9.7%), Temora discaudata (7.7%), S. subtenuis (4.8%), y Euchaeta indica (4.5%), sumando 75% de la abundancia total. En el periodo enero-diciembre del 2011, se registraron 40 especies. Las especies más abundantes fueron Acrocalanus andersoni (21.3%), C. furcatus (13.6%), Acartia tonsa (12.7%), C. pauper (9.8%), C. minor (9.0%), T. discaudata (6.1%) y Paracalanus aculeatus (5.3%). En el segundo capítulo se analizó la serie de tiempo de plancton (copépodos) realizada mensualmente durante 1996-1998 para entender la variabilidad de la estructura de la comunidad y diversidad. Durante el periodo de estudio la columna de agua fue influenciada por el evento El Niño (EN) 1997-98. Dos especies, S. subcrassus y C. furcatus, contribuyeron el 62% a la abundancia de la comunidad, con el 95% de la abundancia compuesta de 16 especies. La estructura de la comunidad mostró una variabilidad estacional, con mayor abundancia y menos diversidad en periodos de surgencias. En periodos de hundimiento la abundancia se disminuyó pero la diversidad de especies se incrementó.

Durante el evento del EN la abundancia de la comunidad se disminuyó pero se mantuvo el patrón estacional. El tercer capítulo describe la producción de huevos de cuatro especies abundantes y su correlación de variables ambientales. Se midieron la tasa de producción de huevos (TPH) y la producción de peso-especifica (Gf) de C. furcatus, T. discaudata, Pontellina sobrina, y Nannocalanus minor. Todas las especies reprodujeron por todo el año con la excepción de N. minor (solo durante el periodo de surgencias). Tenían la TPH relativamente parecido (C. furcatus 23, T. discaudata 22, P. sobrina 21, and N. minor 18 huevos hem-1 día-1). Gf fue relativamente bajo (0.06-0.20 C. furcatus 0.10-0.30, T. discaudata 0.02-0.08, P. sobrina 0.05-0.20, and N. minor 0.05-0.20 μg C). La TPH de P. sobrina fue significativamente correlacionada con la salinidad, la temperatura, Clo a, y peso corporal, también se reporta una expansión en su periodo reproductivo conocido. T. discaudata TPH fue correlacionada con la salinidad, y C. furcatus y N. minor no fueron correlacionados con ninguna variabilidad. En el cuarto capítulo se calculó el nivel trófico usando el δ13C y δ15N de 20 especies de copépodos calanoides, y el índice de borde de las mandíbulas de 13 especies. Se mostró que el nivel trófico medido por isotopos estables tuvo una variabilidad estacional, pero el promedio acordaba bien con los resultados de las mediciones de mandíbulas. C. furcatus, T. discaudata, C. pauper, N. minor, y Undinula vulgaris se reportan como omnívoras, y E. indica y E. rimana como carnívoras.

Resumen en inglés

The response of the calanoid copepod community abundance and diversity, egg production rates, and trophic position to hydroclimatic variability was investigated in the Mexican Central Pacific (PCM) (19°N, 105°W). In the region of PCM the hydrology of the water column has a marked seasonality, which is consistent with upwelling periods (February-May, cold) and downwelling (July-November, warm), interchanged with transitional periods. The first chapter describes the taxonomic composition of calanoid copepods found in the study area between 1996-1998 and 2011. A total of 63 species were recorded from the order Calanoida. During the years 1996-1998, 60 species were recorded, the most abundant being Subeucalanus subcrassus (25.8%), Centropages furcatus (23.5%), Canthocalanus pauper (9.7%), Temora discaudata (7.7%), S. subtenuis (4.8%), and Euchaeta indica (4.5%), equaling 75% of the total abundance. From January to December 2011, 40 species were recorded. The most abundant species were Acrocalanus andersoni (21.3%), C. furcatus (13.6%), Acartia tonsa (12.7%), C. pauper (9.8%), C. minor (9.0%), T. discaudata (6.1%) and Paracalanus aculeatus (5.3%). In the second chapter the calanoid copepod community from a monthly time series (1996-1998) was analyzed to understand the variability of the community structure and diversity. During the study period, the water column was influenced by an El Niño (EN) event from 1997-1998. Two species, C. furcatus and S. subcrassus contributed 62% to the total abundance, with 95% of the total abundance composed of 16 species. The community structure showed a seasonal variability, with greater abundance and lower diversity in upwelling periods. In periods of downwelling abundance decreased but species diversity increased. During the EN event community abundance was decreased but the seasonal pattern was maintained.

The third chapter describes the egg production rates (EPR) of four abundant species and correlation with environmental variables. The EPR and weight-specific production (Gf) of C. furcatus, T. discaudata, Pontellina sobrina and Nannocalanus minor were measured. All species reproduced throughout the year with the exception of N. minor (only during the upwelling period). They had relatively similar TPH (C. furcatus 23, T. discaudata 22, P. sobrina 21, and N. minor 18 eggs fem-1 day-1). Gf was relatively low (C. furcatus 0.10-0.30, T. discaudata 0.02-0.08, P. sobrina 0.05-0.20, and N. minor 0.05-0.20 μg C). The TPH of P. sobrina was significantly correlated with salinity, temperature, Chl a, and body weight; an expansion in its known breeding period is also reported. T. discaudata TPH was correlated with salinity, while C. furcatus and N. minor were not correlated with any variable. In chapter four, trophic level was calculated using the d13C and d15N of 20 species of calanoid copepods, and the edge index from mandible measurements of 13 species. The trophic level as measured by stable isotopes showed seasonal variability, but the annual average had good agreement with the trophic level based on mandible dimensions. C. furcatus, T. discaudata, C. pauper, N. minor, and Undinula vulgaris are reported as omnivores, and E. indica and E. Rimana as carnivorous.

Índice

Dedicatoria
Agradecimientos
Contenido
Resumen
Abstract
Lista de Tablas
Lista de Figuras
Introducción General
Introducción
Justificación del trabajo
Hipótesis
Objetivos
Literatura citada
Capítulo I. Composición Taxonómica de Copépodos Calanoides
Introducción
Método
Resultados
Discusión
Conclusiones
Literatura citada
Capítulo II. Variabilidad Estacional e Interanual de de Comunidad de Copépodos Calanoides Durante 1996-1998: Influencia de El Niño
Introducción
Método
Resultados
Discusión
Conclusiones
Literatura citada
Capítulo III. Tasa Anual de Producción de Huevos de los Cuatro Copépodos Calanoides Dominantes en Aguas Costeras Tropicales Mexicanas
Introducción
Método
Resultados
Discusión
Conclusiones
Literatura citada
Capítulo IV. Estructura Trófica de los Copépodos Calanoides Dominantes en Aguas Costeras de Jalisco
Introducción
Método
Resultados
Discusión
Conclusiones
Literatura citada
Apéndice


5.
- Artículo con arbitraje
Seasonal and interannual variability of the calanoid copepod community structure in shelf waters of the Eastern Tropical Pacific
Kozak, Eva Rose (autora) ; Franco Gordo, María del Carmen (autora) ; Suárez Morales, Eduardo (autor) ; Palomares García, Ricardo (autor) ;
Disponible en línea
Contenido en: Marine Ecology Progress Series Vol. 507 (July 2014), p. 95–110 ISSN: 0171-8630
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Resumen en: Inglés |
Resumen en inglés

The response of the calanoid copepod community structure and diversity to the variability of the oceanographic conditions was analyzed from January 1996 to December 1998 in the central Mexican Pacific. Interannual variability in the water column was marked by the influence of the 1997-98 El Niño (EN). However, seasonal variability was principally linked to the periodicity of coastal upwelling processes. Two species, Subeucalanus subcrassus and Centro - pages furcatus, contributed 62% to the copepod abundance over the 3 yr period, with 16 species making up 95% of the copepod community. Most species were subtropical-tropical (88%), but equatorial (8%) and cosmopolitan (2%) species were also present. Up to 17 species were recorded in 50% or more of samples, of which 10 were coastal or neritic forms. The calanoid copepod community structure varied seasonally, with increased abundance and reduced species richness during upwelling conditions. During upwelling relaxation, the abundance declined but the species richness increased. Additional community variations were related to the EN event, when copepod abundances were significantly lower than during non-El Niño (NEN) periods (F = 20.387, p < 0.05), but seasonal changes were still detectable. There was no increase of species richness in the area related to the influence of EN. These data suggest that the response of this tropical neritic copepod community diverges from that of other zooplankters and that the community is more stable than expected, keeping a seasonal pattern even during the influence of a strong EN.


6.
- Capítulo de libro sin arbitraje
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Anfípodos Hyperiidea de la costa sur de Jalisco y Colima
Gasca, Rebeca ; Franco Gordo, María del Carmen (coaut.) ;
Contenido en: Inventario de biodiversidad de la costa sur de Jalisco y Colima Autlán de Navarro, Jalisco, México : Universidad de Guadalajara, Centro Universitario de la Costa Sur, 2013 Vol. 1, p. 69-78 ISBN:978-607-7768-74-6
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7.
- Capítulo de libro sin arbitraje
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Copépodos de la costa sur de Jalisco y Colima
Kozak, Eva Rose ; Suárez Morales, Eduardo (coaut.) ; Palomares García, Ricardo (coaut.) ; Franco Gordo, María del Carmen (coaut.) ;
Contenido en: Inventario de biodiversidad de la costa sur de Jalisco y Colima Autlán de Navarro, Jalisco, México : Universidad de Guadalajara, Centro Universitario de la Costa Sur, 2013 Vol. 1, p. 79-91 ISBN:978-607-7768-74-6
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8.
- Artículo con arbitraje
Hyperiid amphipod community in the eastern Tropical Pacific before, during, and after El Niño 1997−1998
Gasca, Rebeca ; Franco Gordo, María del Carmen (coaut.) ; Godínez Domínguez, Enrique (coaut.) ; Suárez Morales, Eduardo (coaut.) ;
Contenido en: Marine Ecology Progress Series Vol. 455 (May, 2012), p. 123-139 ISSN: 0171-8630
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Resumen en: Inglés |
Resumen en inglés

To evaluate the hyperiid community’s response to the influence of oceanographic conditions related to ‘El Niño’ (EN) in the Mexican Tropical Pacific area, zooplankton samples collected over 27 mo between December 1995 and December 1998 were analyzed. The most abundant of the 80 species recorded were Hyperioides sibaginis and Lestrigonus bengalensis. Two different climatic yearly periods were revealed, including one from February to June, related to the strongest flow of the California Current (CC), with cooler (<25°C) and saltier (>34.5 psu) waters. In this period, hyperiids were more species-rich and diverse, with greater evenness, but had lower abundances. From July to December, the North Equatorial Countercurrent (NECC) was predominant, with warmer waters (>25°C) and lower salinity (<34.5 psu). H. sibaginis and L. bengalensis were dominant, particularly in the aftermath of EN (after June 1998). The influence of the Equatorial water during EN favored a greater abundance of warm-water hyperiid families and a greater evenness, particularly during 1998. During EN, higher hyperiid abundance and diversity but also a 30% increase of species richness and a greater abundance of the dominant species were observed. After the end of EN and for the rest of the sampling period, the oceanographic conditions returned to normality in the area, but the hyperiid community still showed relatively low diversity and high abundance values.


9.
Capítulo de libro
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Distribución espacial y temporal de larvas de peces de la costa de Jalisco y Colima
Franco Gordo, María del Carmen ; Godínez Domínguez, Enrique (coaut.) ; Rojo Vázquez, Jorge A. (coaut.) ; Suárez Morales, Eduardo (coaut.) ;
Contenido en: Ecosistemas marinos de la costa sur de Jalisco y Colima Guadalajara, Jalisco, México : Universidad de Guadalajara, Centro Universitario de la Costa Sur, 2010 p. 73-91 ISBN:678-607-4501-80-3
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10.
Libro
Ecosistemas marinos de la Costa Sur de Jalisco y Colima / editado por Enrique Godínez Domínguez, María del Carmen Franco Gordow, Jorge A. Rojo Vázquez, Francisco de Asís Silva Bátiz y Gaspar González Sansón
Godínez Domínguez, Enrique (ed.) ; Franco Gordo, María del Carmen (coed.) ; Rojo Vázquez, Jorge A. (coed.) ; Silva Bátiz, Francisco de Asís (coed.) ; González Sansón, Gaspar (coed.) ;
Autlán de Navarro, Jalisco, México : Universidad de Guadalajara. Centro Universitario de la Costa Sur , 2010
Clasificación: 574.526 / E25
Bibliotecas: Campeche , Chetumal
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SIBE Campeche
ECO040004214 (Disponible)
Disponibles para prestamo: 1
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SIBE Chetumal
ECO030007227 (Disponible)
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