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Structure of the Community of Dominant Fish Species Associated to Soft-Bottoms in the Lagoon of La Paz, B.C.S., México

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Open Journal of Marine Science 2020年第3期10卷 79-92页

作者： Bruma R. Castillo-Rosas Emelio Barjau-González Juan Manuel López-Vivas abril karim romo-piñeda Eleonora Romero-Vadillo Jose Ángel Armenta-Quintana Departamento Académico de Ciencias Marinas y Costeras Universidad Autónoma de Baja California Sur La Paz México Departamento Académico de Ciencia Animal y Conservación del Hábitat Universidad Autónoma de Baja California Sur La Paz México

The study of fish communities from coastal lagoons allows a better understanding of role of these organisms in these systems, and the effect of anthropogenic impact. The aim of the present study was to determine the community structure, in particular dominance of fish species associated to soft bottoms in the lagoon of La Paz. Six bimonthly samplings were carried out in seven localities from November 2016 to September 2017 and physicochemical parameters were recorded. Analysis of temperature showed differences between two marked seasons, warm and cold. Species richness showed differences between months and localities. Shannon-Weaver index and pielou’s evenness showed significant differences only between months. Simpson’s index suggests a high diversity. According to the BVI, 15 species from the families Haemulidae, Sciaenidae and Gerreidae, were the most biologically important. Zoogeographic affinity analysis showed that 58% of the species prefer the Province of Cortez. Dominant species recorded in this study play a key role in soft-bottom systems like the lagoon of La Paz.

关键词： Coastal Lagoon Lagoon of La Paz Diversity Dominance

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Determination of the Fish Community Structure of an Intertidal Rocky Zone of the Pacific Coast of Baja California Sur

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Open Journal of Marine Science 2022年第1期12卷 1-18页

作者： Laura E. Cota-Ortega Emelio Barjau-Gonzalez Juan Manuel López-Vivas José Ángel Armenta-Quintana Javier Aguilar-Parra Elvia Esthela Aispuro-Felix abril karim romo piñera Departamento Académico de Ciencias Marinas y Costeras Universidad Autónoma de Baja California Sur La Paz B.C.S. Departamento Académico de Ciencia Animal y Conservación del Hábitat Universidad Autónoma de Baja California Sur La Paz B.C.S. Departamento Académico de Sistemas Computacionales Universidad Autónoma de Baja California Sur La Paz B.C.S.

The intertidal zone (also known as seashore) are transition areas between land and sea, that are greatly influenced by the tide cycle, therefore, environmental parameters, such as temperature and salinity, oscillate according to the periods in which these areas are exposed to air. Intertidal zones are highly diverse, which makes them key ecosystems for the development of sea life (both flora and fauna) exposed to drastic environmental change. The 59 visual censuses campaigns were carried out during the full moon of each month from 2015 to 2019. Temperature, salinity and dissolved oxygen were recorded during each visual census and showed variations between years. Temperature showed two distinct seasons, warm and cold. A total of 14,995 organisms were recorded, belonging to 30 species, 28 genera, 15 families, five orders and one class. Ecological indices like species richness (SR), Shannon-Wiener’s diversity (H') and Fisher’s alpha (α-Fisher) showed significant differences between years, 2015 and 2016 recorded as the most diverse years, while the lowest values were recorded in 2019. Therefore, fish communities of tide pools showed to be highly diverse, with 30 species recording similar relative abundances, and according to the BVI, only 11 species were dominant. Spatio-temporal variations of temperature, salinity and dissolved oxygen were highly correlated to changes in fish community structure, and the dominance of certain species, which are of great importance for the structure and dynamic of the

关键词： Rockpools Ecological Indices Fish Community Structure Intertidal Zone

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