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1.
Libro
The littoral and semi-parasitic cyclopoida, the monstrilloida and notodelphyoida / R. B. Seymour Sewell
Seymour Sewell, R. B. ;
s. l. : s. n. , s. f
Clasificación: 595.34 / S4
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030003554 (Disponible)
Disponibles para prestamo: 1

2.
Libro
Qué es la acuacultura? / Palemón Aguilera Hernández, Pedro Noriega Curtis, Jesús Guzmán Chan
Aguilera Hernández, Palemón ; Noriega Curtis, Pedro (coaut.) ; Guzmán Chan, Jesús (coaut.) ;
México : Secretaría de Pesca , s.f.
Clasificación: 639.3 / A4
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
QAA002717 (Disponible)
Disponibles para prestamo: 1

3.
Artículo
PDF
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.


4.
Artículo
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Advances in the study of Mexican fisheries with the social-ecological system (SES) perspective and its inclusion in fishery management policy
Peña Puch, Angelina del Carmen (autora) ; Pérez Jiménez, Juan Carlos (autor) ; Espinoza Tenorio, Alejandro (autor) ;
Contenido en: Ocean & Coastal Management Vol. 185, 105065 (2020), p. 1-6 ISSN: 0964-5691
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Resumen en: Inglés |
Resumen en inglés

This study describes the progress of the use of the SES perspective and/or the consideration of users’ participation in the scientific literature that study Mexican fisheries, and their inclusion in the fishery management policy. Since 2001, there have been 57 published investigations on 19 fisheries, mostly from the north Pacific (n= 39), focussed mainly on the governance of SES of benthic fisheries, and from the southern Gulf of Mexico and the Caribbean Sea (n= 14), where co-management and the spiny lobster fishery are the most studied. From 21 fisheries having a fishery management plan (FMP), only seven have an international sustainability standard, while another seven fisheries having a sustainability standard have no FMP. In addition, only nine fisheries, with literature that addresses the SES perspective and/or considers the user’s participation (out of a total of 19), have a FMP and only four of those fisheries have a sustainability standard. This reflects a mismatch between the interests of the academic, fishery, and government sectors. The SES perspective has been stable in the academic research since 2012, and has been implemented for some fisheries through participatory management processes of international fishery standards; however, this perspective needs to be fully included in Mexican fishery management instruments (e.g., FMPs) and its implementation could be a primary goal for Mexican fishery policy.


5.
Artículo
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Applicability of biodiversity databases to regional conservation planning in the tropics: a case study evaluation of the effect of environmental bias on the performance of predictive models of species richness
Vaca Genuit, Raúl Abel (autor) ; Rodiles Hernández, María del Rocío (autora) (1956-) ; Soria Barreto, Miriam (autora) ; Muñoz Alonso, Luis Antonio (autor) ; González Díaz, Alfonso Ángel (autor) ; Castillo Santiago, Miguel Ángel (autor) ;
Disponible en línea
Contenido en: Acta Oecologica Volumen 109, artículo número 103653 (November 2020), páginas 1-13 ISSN: 1146-609X
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Resumen en: Inglés |
Resumen en inglés

The biodiversity data typically available for fitting distributional models in the tropics come from museum and scientific collections which are often incomplete and prone to sampling and environmental biases. Nevertheless, most studies undertaken in tropical regions assume that collection data offers a satisfactory environmental coverage without any quantitative assessment. In this study, we investigate the effects of differences in environmental bias and coverage provided by distributional data when aggregated into different grid cell sizes, on the performance of species richness-environment models and predictions. We use an extensive data compilation, including national and regional collections, on the distribution of amphibians, reptiles and fishes in the hydrologic region of the Usumacinta River as a case study. General additive models and environmental variables are used to construct predictive models at 40, 20, 10 and 5 km grid resolutions, based on well-sampled cells. The best multivariate models included nonparametric interaction terms for the effects of precipitation and temperature and suggested an altitudinal shift in the relative importance of energy and water in determining the distribution of species richness.

For fishes, geomorphology accounted for fine scale variation in species richness along the hydrologic network, indicated by peaks in species diversity at the junction of the major rivers where major accumulation of water and sediments occurs. For all taxonomic groups, we found that sampling biases deviated most from the mean bias at the extremes of gradients accounting for important environmental factors. The pattern of environmental bias changed with grid size, with the form and amount of change being casespecific. Biases affected distribution predictions when compared with unbiased datasets. Moreover, not all models resulted best at coarser resolution as it is commonly assumed. Our results demonstrate that bias in the available data must be evaluated before mapping biodiversity distributions, irrespective of the choice of scale.


6.
Artículo
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A geographical cline in craniofacial morphology across populations of Mesoamerican lake-dwelling fishes
Powers, Amanda K. (autora) ; Garita Alvarado, Carlos A. (autor) ; Rodiles Hernández, María del Rocío (autora) (1956-) ; Berning, Daniel J. (autor) ; Gross, Joshua B. (autor) ; Ornelas García, Claudia Patricia (autora) ;
Disponible en línea
Contenido en: Journal of Experimental Zoology. Part A: Ecological and Integrative Physiology Vol. 333, no 3 (March 2020), p. 171-180 ISSN: 2471-5646
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Resumen en: Inglés |
Resumen en inglés

Together, the complex geological history and climatic diversity of Mesoamerica create a rich source of biodiversity from which evolutionary processes can be studied. Here, we discuss highly divergent morphs of lake‐dwelling fishes distributed across Mexico and Central America, originally recognized as members of different genera (Astyanax and “Bramocharax”). Recent phylogenetic studies, however, suggest these morphs group within the same genus and readily hybridize. Despite genetic similarities, Bramocharax morphs exhibit stark differences in cranial shape and dentition. We investigated the evolution of several cranial traits that vary across morphs collected from four lakes in Mexico and Nicaragua and discovered an ecomorphological cline from northern to southern lakes. Northern populations of sympatric morphs exhibit a similar cranial shape and tooth morphology. Southern populations of Bramocharax morphs, however, showed a larger disparity in maxillary teeth, length and frequency of unicuspid teeth, an elongated snout, and a streamlined cranium compared to Astyanax morphs. This divergence of craniofacial morphology likely evolved in association with differences in trophic niches. We discuss the morphological differences across the four lake systems in terms of geological history and trophic dynamics. In summary, our study suggests that Bramocharax morphs are likely locally adapted members derived from independent Astyanax lineages, highlighting an interesting parallel evolutionary pattern within the Astyanax genus.


7.
Artículo
Una nueva especie de halicyclops (Copepoda, cyclopoida, halicyclopinae) de un sistema estuarino de la costa caribe de Colombia
Fuentes Reinés, Juan Manuel (autor) ; Suárez Morales, Eduardo (autor) ;
Contenido en: Acta Biologica Colombiana Vol. 25, no. 1 (January-April 2020), p. 14-21 ISSN: 1900-1649
PDF
Resumen en: Español | Inglés |
Resumen en español

Muestras de plancton obtenidas de la Ciénaga Grande de Santa Marta, un extenso sistema estuarino en el norte de Colombia, produjeron especímenes machos y hembras de una especie no descrita del género Halicyclops. Los copépodos de la familia Cyclopidae son dominantes en los hábitats de agua dulce y transicionales. Los miembros de la subfamilia Halicyclopinae son predominantemente de hábitats salobres, con algunas especies de agua dulce. La nueva especie aquí descrita es asignable al grupo de especies denominado “F” de Halicyclops (sensu Pesce, 2018) con una fórmula de espinas exopodales (P1–4) = 2333. Actualmente, este grupo contiene cinco especies y una subespecie. Halicyclops gutierrezi sp. n. puede distinguirse de sus congéneres conocidos por la ausencia de un verdadero opérculo anal, la longitud relativa de las setas de la P5 de la hembra y del macho, la longitud relativa de las setas internas de P4EXP3 y por detalles de la anténula del macho. Esta es la quinta especie de Halicyclops registrada en Colombia y la primera del grupo “F” de Halicyclops descrita en la cuenca del Caribe. Con la adición de H. gutierrezi sp. n., aumentó a 20 el número de especies del género que se conocen en la región Neotropical. Se proporciona una clave para la identificación de las especies del género registradas en Colombia.

Resumen en inglés

Plankton samples obtained from the Ciénaga Grande de Santa Marta, an extensive estuarine system in northern Colombia, yielded adult male and female specimens of an undescribed halicyclopine cyclopid copepod of the genus Halicyclops. Cyclopid copepods are frequently found in freshwater and transitional habitats. Members of the subfamily Halicyclopinae are chiefly brackish water forms with a few freshwater species. The new species described herein is assignable to the group of species “F” of Halicyclops (sensu Pesce, 2018) with a 2333 exopodal spine formula. Currently, this group contains five species and one subspecies. Halicyclops gutierrezi sp. n. can be distinguished from its known congeners by the absence of an anal operculum, the relative length of setae of the female and male P5, the relative length of the inner setae of P4EXP3, and details of the male antennule. This is the fifth species of Halicyclops recorded from Colombia and the first one of Halicyclops group “F” described from the Caribbean region. With the addition of H. gutierrezi sp. n., the number of species of the genus known from the Neotropics increased to 20. A key to the species of the genus recorded in Colombia is also provided.


8.
Artículo
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Retention and dispersion of virtual fish larvae in the Mesoamerican Reef
Martínez, Samuel (autor) ; Carrillo Bibriezca, Laura Elena (autora) ; Sosa Cordero, Eloy (autor) ; Vásquez Yeomans, Lourdes (autora) ; Marinone, S. G. (autora) ; Gasca, Rebeca (autora) ;
Disponible en línea
Contenido en: Regional Studies in Marine Science Volumen 37, artículo número 101350 (May 2020), p. 1-10 ISSN: 2352-4855
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Resumen en: Inglés |
Resumen en inglés

Retention and dispersion of virtual fish larvae were compared in four regions of the Mesoamerican Barrier Reef System: Gulf of Honduras, Turneffe Atoll, southern coast of Mexico (Xcalak/Chinchorro channel) and northern Chinchorro Bank. The results indicated that in the Gulf of Honduras, 20 % of the surface particles can be retained for up to 40 days, this retention was longer at 50 m depth. The area of Turneffe Atoll showed southward dispersion during November and December; whilst between Chinchorro Bank and Turneffe Atoll, it passes 70% of the released particles of the system. In Xcalak/Chinchorro channel countercurrent area, particles can be retained at the surface and at 50 m depth from September through December, and at 100 m throughout the year. In the northern system, which includes the northern Chinchorro Bankand Cozumel Island, the Yucatan Current rapidly dispersed the particles towards the Gulf of Mexico. These results were partially in agreement with previous studies of connectivity and dispersion. Our results suggest that there tention of particles in the Gulf of Honduras and Xcalak/Chinchorro channel could be higher than it was previously estimated, and that the self-recruitment rates of these two regions could be underestimated with potential population repercussions for species with a planktonic life cycle.


9.
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.


10.
Artículo
Resumen en: Inglés |
Resumen en inglés

In this study, bone char (BC) from pleco fish (Pterygoplichthys spp.) was synthesized, and their textural and physicochemical properties, as well as its adsorption capacity towards fluoride and Cd(II) from single and binary aqueous solutions, were determined. The results showed that the properties of the BCs were independent of the type of bone used and the surface areas were close to 110 m² g−¹. The effect of solution pH revealed that the adsorption capacity of BC towards fluoride from water raised by decreasing the solution pH. This trend was attributed to the electrostatic interaction between the positively charged surface and the fluoride in aqueous solution. On the contrary, the capacity of BC for adsorbing Cd(II) was enhanced by increasing the solution pH, indicating that electrostatic interactions were also essential but with a contrary effect in comparison with fluoride adsorption due to the negatively charged surface at pH above the point zero charge (pHPZC = 8.16). The experimental data for binary adsorption of fluoride and Cd(II) were interpreted satisfactorily using the modified Freundlich multicomponent isotherm (EFMI), and the experimental data revealed that Cd(II) have an antagonistic effect on the adsorption of fluoride, whereas the presence of fluoride does not affect the capacity of BC for adsorbing Cd(II). Thermogravimetric, XRD diffraction and IR spectroscopy analysis corroborated that the adsorption of fluoride in BC is due to electrostatic attractions, ion exchange or chemisorption and physisorption. Besides, the removal of Cd(II) occurs by physical adsorption and ion exchange. It was concluded that BC is an alternative material for the removal of fluoride and Cd(II) from aqueous solutions, and it is a possible application for using the bones of this invasive fish species.