/pdf/coastal-habitats-of-the-gulf-of-mexico-1jpqdlsi3d.pdf

Coastal Habitats of the Gulf of Mexico

Composition and abundance of the ichthyofauna in estuarine and coastal lagoon systems of the South Pacific in Mexico have been scarcely studied. In particular, there is a lack of information on how environmental variables determine the spatio-temporal structure of fish assemblages in those habitats. In this study, fishes were sampled by drop net during twelve months (May 2004 - April 2005) in 22 sites distributed along the Carretas-Pereyra lagoon, located in the Biosphere Reserve La Encrucijada, Chiapas, Mexico. We recorded 11 797 individuals (40 species, in 30 genera and 21 families). Dormitator latifrons was the most dominant species in terms of the Importance Value index, IV (23.05 %), followed by Lile gracilis (10.31 %), Poecilia sphenops (8.60 %) and Poecilia butleri (7.30 %). D. latifrons also accounted for more than one half of the total biomass (50.14 %). Species richness and Shannon-Wiener?s diversity indexes showed similar temporal fluctuations, reaching their highest values during the dry season. The system evidenced temporal ariations in salinity, having observed four different regimes: freshwater, oligohaline, mesohaline and polyhaline. Mean richness and diversity indexes achieved their highest values during the mesohaline period. On the other hand, mean abundances (CPUE) were highest during the freshwater period. Canonical correspondence analysis (CCA) indicated that salinity and temperature were the most important environmental parameters affecting associations of fishes in terms of their abundances. Correlation analyses revealed that among the environmental variables measured in this study, transparency showed the most significant negative correlation with fish richness and Shannon-Wiener?s diversity index. At a local scale, results suggest that spatial and temporal distribution of fish assemblages are determined by differences in the regimes of salinity and transparency, primarily driven by freshwater input from rivers.

/pdf/spatial-and-temporal-variation-of-fish-assemblages-in-a-53r7jlwrlc.pdf

Spatial and temporal variation of fish assemblages in a coastal lagoon of the Biosphere Reserve La Encrucijada, Chiapas, Mexico.

The fish assemblages of Alvarado Lagoon Estuary (a complex of coastal lagoons in the state of V eracruz, Mexico) have been surveyed intermittently by different researchers over the last 40 years. Assessing long- term trends in fish assemblage composition for this ecosystem is problematic due to differences in sampling efforts among the survey periods (1966-1968, 1987-1988, 1989, 1989-1990, 1990-1991 and 2000-2001) and by the inherent ecological variability of estuaries. To overcome these data limitations and better understand fish assem- blage change over time, we used robust, simulation-based analyses to compare collections from the different sur- veys. The 107 fish species collected from the Alvarado Lagoon Estuary in these surveys represent 4 ecological guilds: marine stenohaline, marine euryhaline, estuarine, and freshwater fishes. The occurrence frequency of fish species representing each guild did not change significantly among the survey periods: the chi-square deviation sta- tistic ( 2 = 8.53) was not significantly larger than the average value for 1000 simulated matrices ( 2 = 138.64; P = 1.00). A non-metric multidimensional scaling (MDS) based on Bray-Curtis similarities of fish species presence- absence data showed that the 1966-1968 survey period was the least similar to the other survey periods. For the 1966-1968 survey, the range of Bray-Curtis inter-survey similarities was 40.4-58.6 (n = 5). By comparison, the remaining range of inter -survey similarities was 61.5-81.7 (n = 10). Average taxonomic distinctness () + ) and vari- ation in taxonomic distinctness (7 + ), two sample size-independent measures of diversity, were calculated for all sur- vey periods. Although ) + and 7 + for all survey periods were within the simulated 95% confidence limits for expect- ed values, these values for the 2000-2001 survey period were less than the average ) + and 7 + values for the entire species pool. This suggests that the fish assemblage collected during the latest survey reflects a loss of both wide- spread higher taxa (reduced ) + ) and that the higher taxa lost are those with only a few representative species in the assemblage (reduced 7 + ). These assemblage data show that fish assemblages of Alvarado Lagoon Estuary have not experienced significant changes over 40 years, but differences among the earliest (1966-1968), the latest (2000-2001), and the remaining survey periods indicate a recent decline in diversity.

/pdf/long-term-fish-assemblage-dynamics-of-the-alvarado-lagoon-4crsuvux49.pdf

Long-term fish assemblage dynamics of the alvarado lagoon estuary, veracruz, mexico

A systematic checklist of fishes from Tuxpan, Veracruz is presented in this paper, based in sampling done from 2007 to 2012 on coastal ecosystems. For this purpose, 282 visual censuses were done and 772 specimens were collected at coral reefs, as well as 132 fishes pertained to shrimp and tuna fisheries were studied. 372 fish species belonging to 221 genera and

https://dialnet.unirioja.es/descarga/articulo/4690112.pdf

Lista de los peces de Tuxpan, Veracruz, México

espanolTamiahua es uno de los sistemas lagunares-estuarinos mas extensos del Golfo de Mexico. Es de gran importancia economica y ecologica debido a su alta productividad pesquera y constituye un area de crianza, alimentacion y reproduccion para numerosas poblaciones de peces y crustaceos. Las variaciones espaciales y temporales de la diversidad de peces, abundancia, especies dominantes y componentes comunitarios fueron determinadas de muestras tomadas bimestralmente entre mayo de 1994 y marzo de 1995. De un total de 83 especies, 62 generos y 32 familias recolectadas, se registraron 14 especies, 8 generos y 3 familias por primera vez en el area. Basados en esta recoleccion y trabajos previos, se conoce que 136 especies utilizan el sistema lagunar en alguna etapa de su ciclo de vida. Durante la epoca de lluvias se presentaron valores altos de diversidad y abundancia (H′ n = 2.7, D = 7.1 y J′ = 0.6; biomasa = 59.3 g m¯², densidad = 5.8 ind m¯² y peso promedio = 10.2 g ind¯¹). Las fluctuaciones estacionales de estos parametros reflejan los ciclos de vida de diferentes especies (principalmente las especies dominantes) relacionados con la dinamica ambiental del sistema. Con base en un analisis grafico-estadistico utilizando datos de abundancia y frecuencia de 22,984 individuos, se clasificaron las especies que habitan en el sistema como residentes, en transito, irregulares y raras. Este analisis revelo la presencia de 9 especies residentes, representando 77% y 73% del numero total de individuos y biomasa, respectivamente. En orden de importancia, estas especies fueron Anchoa mitchilli, Membras vagrans, Hyporhamphus roberti, Bairdiella chrysoura, Eucinostomus melanopterus, Strongylura notata, Mugil curema, Achirus lineatus y Cynoscion nebulosus. EnglishTamiahua is one of the largest estuarine-lagoonal systems in the Mexican Gulf of Mexico. It has great economic and ecological importance due to high fisheries productivity and because it serves as a nursery, feeding and reproduction area for numerous populations of fishes and crustaceans. Spatial and temporal variations of fish diversity, abundance, dominant species and community inhabitants were determined based on samples taken on a bimonthly basis from May 1994 to March 1995. A total of 83 species, 62 genera and 32 families were collected, of which 14 species, 8 genera and 3 families were recorded for the first time in this area. Based on our collections and earlier reports, 136 species are known to use this lagoon system at some stage of their life cycle. The highest diversity and abundance values occurred during the rainy season (H′n = 2.7, D = 7.1, and J′ = 0.6; biomass = 59.3 g m¯² , density = 5.8 ind m¯², and average weight = 10.2 g ind¯¹). Seasonal fluctuation of these parameters reflects the life cycles of different species (mainly the dominant species) related to the environmental dynamics of the ecosystem. Based on a graph-statistical analysis of the abundance and frequency data of 22,984 individuals, the fish species inhabiting the system were classified into four groups: resident, transient, irregular and rare. This analysis revealed the presence of 9 resident species, representing 77% and 73% of the total number of individuals and biomass, respectively. In order of importance, these species were Anchoa mitchilli, Membras vagrans, Hyporhamphus roberti, Bairdiella chrysoura, Eucinostomus melanopterus, Strongylura notata, Mugil curema, Achirus lineatus, and Cynoscion nebulosus.

http://www.scielo.org.mx/pdf/ciemar/v29n4b/v29n4ba6.pdf

Characterization of fish assemblages in a tropical coastal lagoon in the northwest Gulf of Mexico

We analyze the origin of knowledge about fish species richness in the Tuxpan-Tampamachoco estuarine system, in Veracuz, Mexico. A complete inventory of the fish species known to date for this system (N=179) was elaborated from published lists and from sampling seagrass meadows of Tampamachoco Lagoon, which yielded 14 previously unknown species. W hen compared, the different Iists showed a low similarity that may reflect differences in sampling methods and collecting strategies. Current data suggest that fish species richness in Mexican coastal lagoons (Gulf of Mexico) is not related with iagoon surface area, as has been suggested, but with the number of inventories available for each lagoon, being these a reflection of the sampling effort. A sampling design for the assessment of fish species richness in estuarine systems should consider: a) using the highest possible variety of sampling fishing gears, b) col!ecting in al! microhabitat types and c) the preference of bimonthly or quarterly samplings for two or more years over monthly samplings in a single year

/pdf/evaluacion-de-la-riqueza-de-especies-de-peces-en-las-lagunas-4yeeasgqyi.pdf

Roberto E Torres-Orozco B

Papers

Evaluación de la riqueza de especies de peces en las lagunas costeras mexicanas: estudio de un caso en el Golfo de México