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  1. Article ; Online: Ontogenetic shifts in feeding habits of orangemouth weakfish (Cynoscion xanthulus): From estuarine benthic feeder to marine nektivore top predator

    Muro‐Torres, Víctor M. / Amezcua, Felipe / Green, Lucinda / Payan, Jorge / Balart‐Páez, Eduardo F. / Amezcua‐Linares, Felipe

    Marine Ecology. 2023 Feb., v. 44, no. 1 p.e12735-

    2023  

    Abstract: Orangemouth weakfish is a highly important commercial and game fish species in the Tropical Eastern Pacific. However, studies assessing changes in its trophic ecology relevant to size, habitat (estuarine or marine), sex, and season are non‐existent. We ... ...

    Abstract Orangemouth weakfish is a highly important commercial and game fish species in the Tropical Eastern Pacific. However, studies assessing changes in its trophic ecology relevant to size, habitat (estuarine or marine), sex, and season are non‐existent. We assessed its feeding habits and trophic position (TP) according to the aforementioned factors. Its dietary breadth was composed of 33 types of prey. The feeding habits and isotopic values (δ¹⁵N and δ¹³C) registered differences between sizes and habitat, indicating ontogenetic changes in habitat as well as TP, as small organisms (TP 3.1) inhabited the estuarine area, feeding on benthic and demersal organisms, whilst large individuals (TP 4.1) were found in the marine environment, preying on nektonic fauna. No differences were found according to sex or season. The isotopic niche showed that the different sizes of this species are generalist consumers with a clear separation between them and between habitats, as estuarine juvenile and preadult organisms have a larger isotopic niche than adult marine organisms, being an opportunist tertiary estuarine consumers during their early stages, and a top marine predator during the adult phase.
    Keywords Cynoscion ; adults ; estuaries ; fauna ; fish ; game fish ; habitats ; juveniles ; marine environment ; marine science ; nekton ; ontogeny
    Language English
    Dates of publication 2023-02
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 2020745-1
    ISSN 1439-0485 ; 0173-9565
    ISSN (online) 1439-0485
    ISSN 0173-9565
    DOI 10.1111/maec.12735
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Spatiotemporal Variability in Fish Assemblages in a Coastal and Estuarine System in the Tropical Eastern Pacific during the Anthropause

    Hernández-Álvarez, Yareli / Ramírez-Ortiz, Georgina / Flores-de-Santiago, Francisco / Amezcua Linares, Felipe / Muro-Torres, Victor / Arceo-Carranza, Daniel / Amezcua, Felipe

    Diversity. 2023 Aug. 17, v. 15, no. 8

    2023  

    Abstract: Differences in fish assemblages’ composition and their relationship with the environmental variables were analyzed in the Urías estuarine system, Mexican North Pacific. Environmental variables and fish catches were recorded bimonthly between June 2018 ... ...

    Abstract Differences in fish assemblages’ composition and their relationship with the environmental variables were analyzed in the Urías estuarine system, Mexican North Pacific. Environmental variables and fish catches were recorded bimonthly between June 2018 and November 2021, including a period before and during the COVID-19 pandemic. Multivariate analyses were performed in the studied area to define zones based on their environmental, biotic, and abiotic characteristics and the effect of these on the fish assemblages. Two zones were identified, an estuarine with mangrove forest and a surf zone in the coastal area outside the estuarine system. Fish composition, biomass, and diversity (α and β) were evaluated among the factors of the period (before–during COVID-19), climatic seasons, and zones. A total of 5947 fish individuals of 41 species were collected using beach seines as fishing gear. The structure of the fish assemblages was different between zones and periods. Abiotic (temperature, salinity, and total matter suspended), biotic (mangrove area), and temporal (season and period before–during COVID-19) variables had an effect on fish biomass and α diversity, while the results of the β diversity only indicate changes in the nestedness component before–during the lockdown. These results indicate a change in fish assemblages’ structure and composition between periods, which might be a consequence of the limitation of human activities derived from the pandemic, climatic changes, or a combination of both effects. Our results show that fish assemblages in the estuarine systems of the Tropical Eastern Pacific are unique, and there is a need to establish local management strategies for these ecosystems.
    Keywords COVID-19 infection ; biomass ; coasts ; estuaries ; fish ; humans ; mangrove forests ; nestedness ; pandemic ; salinity ; temperature
    Language English
    Dates of publication 2023-0817
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article ; Online
    ZDB-ID 2518137-3
    ISSN 1424-2818
    ISSN 1424-2818
    DOI 10.3390/d15080934
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Are the Temporal Changes Observed in the Reproductive Biology of the Estuarine Conguito Sea Catfish Related to Increased Small‐Scale Fishing Effort on the Northwestern Pacific Coast of Mexico?

    Amezcua‐Linares, Felipe / Cruz‐González, Karen A. / Flores‐de‐Santiago, Francisco / Muro, Victor / Green, Lucinda / Amezcua, Felipe

    Marine and coastal fisheries. 2022 Aug., v. 14, no. 4

    2022  

    Abstract: Biological parameters relating to the reproductive biology of Conguito Sea Catfish Cathorops liropus were investigated in 1979–1984 and 2015–2018 from an estuarine system on the northwestern Pacific coast of Mexico. In the first period, the spawning ... ...

    Abstract Biological parameters relating to the reproductive biology of Conguito Sea Catfish Cathorops liropus were investigated in 1979–1984 and 2015–2018 from an estuarine system on the northwestern Pacific coast of Mexico. In the first period, the spawning season occurred during the dry–warm season (April–June), according with the percentage of mature females and the highest gonadosomatic index (GSI) values. Mean TL was 12.3 cm, two cohorts were found, length at maturity was 18.6 cm, and fecundity was 24.47 oocytes/organism. In the second period, the spawning season extended to the rainy–warm season (July–November), as reflected by the percentage of mature females and the GSI values. Mean TL was 11.6 cm, length at maturity decreased to 17.1 cm, and fecundity decreased to 20.67 oocytes/organism, indicating a reduction in the size‐based indicators and a change in the spawning period and reproductive effort as time passed. The number of fishing skiffs increased from 1,103 in 1980 to 2,434 in 2019, representing a 220% increase, and the landings increased from 400 to 3,432 metric tons in the same period. Temporal trends in surface water temperature, salinity, and the Oceanic Niño Index did not explain the observed changes between the study periods. These results suggest that the observed changes in the reproductive potential of Conguito Sea Catfish have been at least partially due to fishing.
    Keywords Cathorops ; catfish ; coasts ; estuaries ; fecundity ; gonadosomatic index ; oocytes ; salinity ; surface water temperature ; Mexico
    Language English
    Dates of publication 2022-08
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2483227-3
    ISSN 1942-5120
    ISSN 1942-5120
    DOI 10.1002/mcf2.10217
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Assessing the Spatiotemporal Relationship between Coastal Habitats and Fish Assemblages at Two Neotropical Estuaries of the Mexican Pacific

    Muro-Torres, Victor / Amezcua, Felipe / Ramírez-Ortiz, Georgina / Flores-de-Santiago, Francisco / Amezcua-Linares, Felipe / Hernández, Yareli

    Diversity. 2022 Aug. 02, v. 14, no. 8

    2022  

    Abstract: Differences in fish assemblages’ structures and their relations with environmental variables (due to the variations in sampled seasons, habitats, and zones) were analyzed in two adjacent estuaries on the north Pacific coast of Mexico. Environmental ... ...

    Abstract Differences in fish assemblages’ structures and their relations with environmental variables (due to the variations in sampled seasons, habitats, and zones) were analyzed in two adjacent estuaries on the north Pacific coast of Mexico. Environmental variables and fish catches were registered monthly between August 2018 and October 2020. Multivariate analyses were conducted to define habitats and zones based on their environmental characteristics, and the effect of this variability on fish assemblages’ composition, biomass, and diversity (α and β) was evaluated. A total of 12,008 fish individuals of 143 species were collected using different fishing nets. Multivariate analyses indicated that fish assemblages’ structures were different between zones due to the presence, height, and coverage of distinct mangrove species. Additionally, depth and salinity showed effects on fish assemblages’ diversity (α and β-nestedness), which presented higher values in the ocean and remained similar in the rest of the analyzed zones and habitats. These results and the differences in species replacement (β-turnover) indicate the singularity of fish assemblages at estuaries (even in areas close to the ocean) and the necessity to establish local management strategies for these ecosystems.
    Keywords Neotropics ; biomass ; coasts ; fish ; salinity ; Mexico
    Language English
    Dates of publication 2022-0802
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2518137-3
    ISSN 1424-2818
    ISSN 1424-2818
    DOI 10.3390/d14080619
    Database NAL-Catalogue (AGRICOLA)

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