Ignacio Winfield

Lista actualizada de las especies de anfípodos (Peracarida: Gammaridea y Corophiidea) marinos invasores en México

An updated checklist of the marine invasive amphipod species from Mexico is documented. This list includes 11 species, belonging to the suborders Gammaridea and Corophiidea, and grouped in five families and six genera. Information about distribution, habitat, natural history, and dispersal mechanisms was added, according to the Sistema Nacional de Informacion sobre Biodiversidad and Analisis de Riesgo. The species Ampelisca abdita, A.burkei, A. schellenbergi, Melita nitida, Colomastix irciniae, C. tridentata, Ampithoe longimana, A. pollex, Apocorophium acutum, Monocorophium acherusicum, and M. insidiosum, were characterized as marine invasive species from Mexico.

Population study of the landhopper Talitroides topitotum (Crustacea: Amphipoda: Talitridae) in central Mexico.

A population of Talitroides topitotum discovered in Mexico City in 1992, was studied during a one year cycle. Abundance varied significantly during the study period, high population numbers occurred from June to October with a marked decrease from November to May. Maximum total length was 12.5mm and the size at first reproduction for females was 4.0 mm total length. Talitroides topitotum reproduced all year, with a peak in June. A female biased sex ratio was obtained in every sample with a maximum of 4:1 in May. Fecundity varied from one to nine eggs per female and mean fecundity varied significantly through time. The results show that T. topitotum exhibits little variation among widely separated populations and, 4 years after introduction, a life cycle adjusted to the local weather.

Cadmium, copper and lead in macroalgae from the Veracruz Reef System, Gulf of Mexico: Spatial distribution and rainy season variability

This study focused on the spatial distribution of trace metals in the Veracruz Reef System in the Southern Gulf of Mexico, and its variability in the early (July) and late (September) rainy season of 2008, by analyzing the concentration of Cd, Cu and Pb in benthic macroalgae. Mean concentrations are lower (Pb 295 ± 347 ng g(-1), Cd 17.9 ± 15.0 ng g(-1)), or similar (Cu 3.4 ± 4.5 μg g(-1)) to those reported from other coastal areas. Cd and Pb concentrations are influenced by the discharge of the Jamapa River, evidencing a fluvial control on coastal trace metal levels. Also, Cd and Cu concentrations were lower in the late rainy season, when there is a high load of suspended sediments derived from fluvial discharge, which probably adsorb dissolved metals decreasing their bioavailability. Pb concentrations have been decreasing in the last two decades in the SGM, after the banning of leaded-gasoline in the late 20th century.

Two New Species of Amphipods (Peracarida, Amphipoda, Leucothoidae) from the Veracruz Coral Reef System, S.W. Gulf of Mexico

Two new species of amphipods of the genus Leucothoe, L. ortizi and L. hendrickxi, are described from the Veracruz Coral Reef System, Veracruz, Mexico. The specimens were collected from artificial substrates placed at a depth of 13 m. The two new species are compared to other, closely similar species of Leucothoe. Se describen dos nuevas especies de anfipodos del genero Leucothoe, L. ortizi y L. hendrickxi, colectadas en el Sistema Arrecifal Veracruzano, Veracruz, Mexico. Los especimenes fueron colectados en sustratos artificiales colocados a 13 m de profundidad. Las dos nuevas especies son comparadas con otras especies cercanamente relacionadas de Leucothoe.

A New Commensal Species of the Genus Leucothoe Leach, 1814 (Amphipoda: Leucothoid

Abstract The description of a new species of amphipod crustacean (Gammaridea) of the genus Leucothoe found in a sponge, collected during the 3rd Joint Cuban-Spanish Expedition to the waters of Guanahacabibes Peninsula, at the Western Cuban Platform, in July 2008, is given. The main differences among L. luquei n. sp., and the other species known in the region, are also presented. Résumé On présente la description d’une nouvelle espèce de crustacé amphipode (Gammaridea) du genre Leucothoe, trouvé dans une éponge recueillies au cours de la 3eme expédition mixte cubaineespagnol dans les eaux de Guanahacabibes péninsule, à la plateforme occidentale de Cuba, en Juillet 2008. Les principales différences entre L. luquei n. sp., et les autres espèces déjà connues dans la région, sont également présentés. REZUMAT În lucrare se descrie o nouă specie de amfipode (Gammaridea) aparținînd genului Leucothoe care a fost găsită într-un spongier din Peninsula Guanahacabibes, din apele platformei cubaneză de vest, în timpul celei de a 3-a Expediție spaniolo-cubaneză, din iulie 2008. În plus, sunt prezentate diferențele mai importante dintre L. luquei n. sp. și speciile deja cunoscute din Golful Mexic și Marea Caraibilor.

A new genus and species of Cyproideidae (Crustacea: Peracarida: Amphipoda) from a tropical coral reef, SE Gulf of Mexico

Sisalia carricarti new genus, new species, is described on specimens collected from the Sisal Coral Reef System, Southern Gulf of Mexico, Mexico. The new genus is most morphologically similar to the genus Paracyproidea, but can be distinguished by the article 2 of antenna 2 peduncle, the peduncle of the uropods and length of rami, and telson. Also, the new genus can be distinguished from the rest 18 genera of the family Cyproideidae by the following characteristics: 3-articulate mandible palp, mandible molar big and triturative; palp on maxilla 2 uniarticulate; article 2 of pereopods 3-7 rectilinear, and urosomites 1-3 not elongated. Sisalia carricarti new genus, new species, represents the second known genus and third species of cyproideid amphipods documented from the Inter-American Sea (Gulf of Mexico and Caribbean Sea), and the 19th genus and 44th species of the world cyproideid fauna. The more significant morphological characters and the geographical distribution of the 19 known genera of cyproideid amphipods are also pointed out.

Curidia nunoi sp. nov. (Crustacea: Amphipoda: Ochlesidae), a new benthic species from a tropical coral reef southern Gulf of Mexico

A new species of Curidia is described based on material collected from Sisal Coral Reef System, south-east Gulf of Mexico, Mexico. It is the eighth species of this genus described worldwide. Curidia nunoi sp. nov. is morphologically similar to C. wakabarae and C. andreae. Curidia nunoi sp. nov., however, differs from these two species by a combination of several characters, including: the posteroventral spine of peduncle articles 1 and 2 of antenna 1, the distoventral spine of peduncle article 4 of antenna 2, the distal margin of coxa of gnathopod 1, the dactylus of gnathopod 2, the inner and outer plates of maxilla 1, and the distal margin of telson. The global geographical distribution of the genus Curidia is mostly from tropical to subtropical seas; five species are documented in the southern hemisphere and three in the northern hemisphere. Only C. debrogania, C. monicae , and C. nunoi sp. nov. are restricted to the Gulf of Mexico and the Caribbean Sea.

TRANSPORT OF FARFANTEPENAEUS AZTECUS POSTLARVAE IN THREE LAGOON-SYSTEM INLETS IN THE SOUTHWESTERN GULF OF MEXICO

[This study evaluates the night-time recruitment of Farfantepenaeus aztecus postlarvae and its relation with temperature, salinity, and velocity and flow direction of the current in the artificial inlet of the Camaronera lagoon of Alvarado, Veracruz, the Soto la Marina river inlet of Tamaulipas, and the Puerto Real inlet of Terminos lagoon, Campeche. Sampling was done during the night. A conical 243 μm mesh net was used for capture. The total catch of F. aztecus for the three coastal systems was 95,279 postlarvae. The average temperature was 28.23 ± 1.37°C, salinity 23.54 ± 7.10 psu, and stream velocity 0.39 ± 0.18 m s–1. During this study, the existence of recruitment peaks between 20:00 h and 02:00 h was established. The correlation coefficient between the density of postlarvae in the hours of sampling and environmental factors was significant (P 23 psu. Recruitment is related to the influx of seawater towards the coastal systems. There was no significant difference in postlarval density (P > 0.05) between consecutive sampling cycles. En este estudio se evaluo el reclutamiento de las postlarvas de Farfantepenaeus aztecus y su relacion con la temperatura, salinidad, velocidad y direccion de la corriente en la boca de comunicacion artificial de la laguna Camaronera de Alvarado, Veracruz, la boca del rio Soto la Marina, Tamaulipas y la boca de comunicacion Puerto Real de la laguna de Terminos, Campeche. Los muestreos se realizaron durante la noche. Para las capturas se utilizo una red conica de 243 micras de abertura de malla. La abundancia total de F. aztecus para los tres sistemas fue de 95 279 postlarvas. El promedio de temperatura fue de 28,23 ± 1,37°C, salinidad de 23,54 ± 7,10 ups y velocidad de corriente de 0,39 ± 0,18 m s–1. Durante la realizacion de este estudio se presentaron los picos de reclutamiento entre las 20:00 h y las 02:00. El coeficiente de correlacion entre la densidad de postlarvas y los factores ambientales fue significativo (P 0,05) entre los ciclos de muestreo consecutivos., This study evaluates the night-time recruitment of Farfantepenaeus aztecus postlarvae and its relation with temperature, salinity, and velocity and flow direction of the current in the artificial inlet of the Camaronera lagoon of Alvarado, Veracruz, the Soto la Marina river inlet of Tamaulipas, and the Puerto Real inlet of Terminos lagoon, Campeche. Sampling was done during the night. A conical 243 μm mesh net was used for capture. The total catch of F. aztecus for the three coastal systems was 95,279 postlarvae. The average temperature was 28.23 ± 1.37°C, salinity 23.54 ± 7.10 psu, and stream velocity 0.39 ± 0.18 m s–1. During this study, the existence of recruitment peaks between 20:00 h and 02:00 h was established. The correlation coefficient between the density of postlarvae in the hours of sampling and environmental factors was significant (P 23 psu. Recruitment is related to the influx of seawater towards the coastal systems. There was no significant difference in postlarval density (P > 0.05) between consecutive sampling cycles. En este estudio se evaluo el reclutamiento de las postlarvas de Farfantepenaeus aztecus y su relacion con la temperatura, salinidad, velocidad y direccion de la corriente en la boca de comunicacion artificial de la laguna Camaronera de Alvarado, Veracruz, la boca del rio Soto la Marina, Tamaulipas y la boca de comunicacion Puerto Real de la laguna de Terminos, Campeche. Los muestreos se realizaron durante la noche. Para las capturas se utilizo una red conica de 243 micras de abertura de malla. La abundancia total de F. aztecus para los tres sistemas fue de 95 279 postlarvas. El promedio de temperatura fue de 28,23 ± 1,37°C, salinidad de 23,54 ± 7,10 ups y velocidad de corriente de 0,39 ± 0,18 m s–1. Durante la realizacion de este estudio se presentaron los picos de reclutamiento entre las 20:00 h y las 02:00. El coeficiente de correlacion entre la densidad de postlarvas y los factores ambientales fue significativo (P 0,05) entre los ciclos de muestreo consecutivos.]

Coral reef tanaidacean assemblages along the SW and SE Gulf of Mexico: biodiversity, geographic distribution and community structure

ABSTRACT The biodiversity, geographic distribution, and community parameters of the benthic tanaidaceans associated with three coral reefs along the SW and SE Gulf of Mexico were analysed. A total of 15,525 specimens were grouped in 36 species. The highest value of abundance was found in the PNSAV with 6382 tanaidaceans. The PNSAV presented 30 species, the ANPT-L 16 species, and the SABS 17 species. The species with the widest distribution were Pseudonototanais sp., Condrochelia dubia, Leptochelia forresti, Synapseudes sp., Haplopolemius propinquus, Alloleptochelia longimana, and Paradoxapseudes bermudeus. In the Veracruz System Reef, the highest abundance was recorded for Condrochelia dubia and Pseudonototanais sp. The highest value of diversity was obtained in the SABS (3.08 bits/ind in the reef Bajo Diez), and the lowest value was found in the PNSAV (0.07 bits/ind in the reef Isla de Enmedio). The highest value of abundance was found in coral rubble and macroalgae. A significant relationship between depth and specific richness was found in the three reef systems. Using cluster analysis, three groups were found in each system, mainly related to the proximity to the coast and to urban areas. This is one of the first studies to show the specific substrate and attributes of three communities of tanaidaceans along the SE–SW coast of the Gulf of Mexico.

A new deep-sea Psammogammarus species (Crustacea: Amphipoda: Eriopisidae) from the continental slope of the SE Gulf of Mexico

ABSTRACT A new deep-sea species of amphipod collected at a depth of 1317 m from the soft bottom of the Bay of Campeche, SW Gulf of Mexico, is herein described. The sediment included a high proportion of silt and organic carbon. The specimen examined in this study was collected during the Oceanographic Expedition Xcambó-4, along the Bay of Campeche, aboard the RV Justo Sierra. The new species represents the sixteenth known species of the genus Psammogammarus worldwide. This new species is the second Psammogammarus recorded from the deep sea, and the first record of the genus for the Gulf of Mexico. Identification keys to males and females of Psammogammarus species are provided. Psammogammarus barrerai sp. nov. is characterised by head with anteroventral notch present; gnathopods 1 and 2 palmar margins oblique, and basis of pereopod 7 forming a wide serrated posterior lobe. www.zoobank.org/urn:lsid:zoobank.org:pub:C843777B-FF15-4AEC-B046-6513A96A9BFF