Ichthyoplankton

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Hui Zhang - One of the best experts on this subject based on the ideXlab platform.

  • assemblage structure of the Ichthyoplankton and its relationship with environmental factors in spring and autumn off the pearl river estuary
    Frontiers in Marine Science, 2021
    Co-Authors: Gang Hou, Jinrun Wang, Limei Liu, Yanying Chen, Chuanhao Pan, Jianbin Lin, Hui Zhang
    Abstract:

    Ichthyoplankton assemblages and their relationship with environmental variables are investigated in waters off the Pearl River Estuary in spring and autumn of 2019. Of 80 Ichthyoplankton taxa identified using DNA barcode and morphological methods, 61 are identified to species. The most abundance families (Carangidae, Trichiuridae, Mullidae and Scombridae) account for 61.34% of the horizontal total catch in spring, while Menidae and Carangidae are the most abundant families identified in autumn, accounting for 89.72% of the horizontal total catch. Cluster analysis identifies three species assemblages in spring, and four in autumn based on horizontal trawls. Relationships between assemblage structure and environmental variables (in situ and remote sensed) are determined by canonical correspondence analysis. Ichthyoplankton assemblage structure appears to be strongly influenced by sea level anomalies, salinity, water depth, temperature at 10m depth, and distance from shore. We demonstrate the efficacy of using DNA barcode to identify Ichthyoplankton, and suggest how these data can be used to protect fish spawning grounds in waters off the Pearl River Estuary.

  • modelling the potential impacts of climate change on the distribution of Ichthyoplankton in the yangtze estuary china
    Diversity and Distributions, 2020
    Co-Authors: Zhixin Zhang, Wei-wei Xian, Stefano Mammola, Hui Zhang
    Abstract:

    AIM: Species distribution models (SDMs) are an effective tool to explore the potential distribution of terrestrial, freshwater and marine organisms; however, SDMs have been seldom used to model Ichthyoplankton distributions, and thus, our understanding of how larval stages of fishes will respond to climate change is still limited. Here, we developed SDMs to explore potential impacts of climate change on habitat suitability of Ichthyoplankton. LOCATION: Yangtze Estuary, China. METHODS: Using long‐term Ichthyoplankton survey data and a large set of marine predictor variables, we developed ensemble SDMs for five abundant Ichthyoplankton species in the Yangtze Estuary (Coilia mystus, Hypoatherina valenciennei, Larimichthys polyactis, Salanx ariakensis and Chelidonichthys spinosus). Then, we projected their habitat suitability under present and future climate conditions. RESULTS: The ensemble SDMs had good predictive performance and were successful in estimating the known distributions of the five species. Model projections highlighted two contrasting patterns of response to future climates: while C. mystus will likely expand its range, the ranges of the other four species will likely contract and shift northward. MAIN CONCLUSIONS: According to our SDM projections, the five Ichthyoplankton species that we tested in the Yangtze Estuary are likely to respond differently to future climate changes. These projected different responses seemingly reflect the differential functional attributes and life‐history strategies of these species. To the extent that climate change emerges as a critical driver of the future distribution of these species, our findings provide an important roadmap for designing future conservation strategies for Ichthyoplankton in this region.

  • Seasonal variations of the Ichthyoplankton assemblage in the Yangtze Estuary and its relationship with environmental factors
    PeerJ Inc., 2019
    Co-Authors: Hui Zhang, Wei-wei Xian, Shu-de Liu
    Abstract:

    Seasonal variations of the Ichthyoplankton assemblage and its relationship with the environment were analyzed based on four seasonal surveys during 2012. Historical data was collected to be compared with results from previous years in order to indicate the seasonal and inter-annual variation of the Ichthyoplankton assemblage in the Yangtze Estuary and the adjacent waters. A total of 3,688 individuals belonging to 5 orders, 9 families, and 15 species were collected. No samples were collected in the winter cruise. In 2012, all samples were separated into four ecotypes, which is comparable with the historical data from previous years. The Engraulis japonicus was the most abundant species of all teleost fishes. The E. japonicus was captured in every season and contributed the most to the abundance of Ichthyoplankton, which was greater than that of previous years. This result may be due to the periodic fluctuations of E. japonicus or from the displacement of spawning grounds offshore for environmental reasons. The diversity indices of the assemblage were significantly different among seasons, with the number and abundance of the species peaking in the spring, while richness, evenness and diversity indices peaked in the autumn. The species richness of the Ichthyoplankton varied from 0.74 to 1.62, the Pielou evenness index varied from 0.10 to 0.49 and the Shannon–Wiener index varied from 0.19 to 1.04. The results of CCA analysis showed that the major factors affecting the Ichthyoplankton assemblage differed throughout the seasons. Chla was the key factor affecting the Ichthyoplankton in 2012. These seasonal and inter-annual variations likely resulted from migrations associated with fish spawning as well as the environment. Compared with data from previous studies, the relationship between the assemblage structure of Ichthyoplankton and corresponding environmental variables have undergone a decline

  • Autumn Ichthyoplankton assemblage in the Yangtze Estuary shaped by environmental factors
    PeerJ Inc., 2016
    Co-Authors: Hui Zhang, Wei-wei Xian, Shu-de Liu
    Abstract:

    This study investigated the response of the Ichthyoplankton community to environmental changes in the Yangtze Estuary using canonical correspondence analysis. Ichthyoplankton community and environmental data were recorded during the autumns of 1998, 2000, 2002, 2003, 2004, 2007 and 2009. Among the Ichthyoplankton, the dominant larval and juvenile families were the Engraulidae, Gobiidae and Salangidae, and the most common eggs were from Trichiurus lepturus. The Ichthyoplankton was identified via canonical correspondence analysis to three assemblages: an estuary assemblage dominated by Chaeturichthys stigmatias, a coastal assemblage dominated by Engraulis japonicus and Stolephorus commersonii, and an offshore assemblage dominated by Trichiurus lepturus. Regarding environmental factors in the Yangtze Estuary, suspended matter and surface seawater salinity were the main factors influencing the distributions of the different assemblages, while sediment from the Yangtze River during the rainy season and chlorophyll a were the principle drivers of the annual variances in the distribution of Ichthyoplankton assemblages. Our aims in this study were to provide detailed characterizations of the Ichthyoplankton assemblage in the autumns of seven years, examine the long-term dynamics of autumn Ichthyoplankton assemblages, and evaluate the influence of environmental factors on the spatial distribution and inter-annual variations of Ichthyoplankton assemblages associated with the Yangtze Estuary

  • Ichthyoplankton assemblage structure of springs in the yangtze estuary revealed by biological and environmental visions
    PeerJ, 2015
    Co-Authors: Hui Zhang, Wei-wei Xian, Shu-de Liu
    Abstract:

    The Ichthyoplankton assemblage structure in the Yangtze Estuary was analyzed based on four springs in 1999, 2001, 2004 and 2007 in order to provide detailed characterizations of the Ichthyoplankton assemblage in springs, examine the long-term dynamics of spring Ichthyoplankton assemblages, and evaluate the influence of environmental factors on the spatial distribution and inter-annual variations of Ichthyoplankton assemblages associated with the Yangtze Estuary. Forty-two Ichthyoplankton species belonging to 23 families were collected. Engraulidae was the most abundant family, including six species and comprising 67.91% of the total catch. Only four species (Coilia mystus, Engraulis japonicus, Trachidermis fasciatus and Allanetta bleekeri) could be considered dominant, accounting for 88.70% of total abundance. The structure of the Ichthyoplankton spring assemblage persisted on an annual basis, with the dominant species reappearing consistently even though their abundance fluctuated from year to year. This inter-annual variation probably reflects variable environmental conditions influenced by jellyfish blooms, declining river flow, and overfishing. Canonical correspondence analysis indicated aspatial structure of the Ichthyoplankton assemblage in three areas: (1) an inner assemblage dominated by C. mystus; (2) a central assemblage dominated by A. bleekeri and T. fasciatus; and (3) a shelf assemblage featuring E. japonicus. The observed Ichthyoplankton assemblage structure appears to be strongly influenced by depth, salinity and suspended particulate matter gradients.

Shu-de Liu - One of the best experts on this subject based on the ideXlab platform.

  • Seasonal variations of the Ichthyoplankton assemblage in the Yangtze Estuary and its relationship with environmental factors
    PeerJ Inc., 2019
    Co-Authors: Hui Zhang, Wei-wei Xian, Shu-de Liu
    Abstract:

    Seasonal variations of the Ichthyoplankton assemblage and its relationship with the environment were analyzed based on four seasonal surveys during 2012. Historical data was collected to be compared with results from previous years in order to indicate the seasonal and inter-annual variation of the Ichthyoplankton assemblage in the Yangtze Estuary and the adjacent waters. A total of 3,688 individuals belonging to 5 orders, 9 families, and 15 species were collected. No samples were collected in the winter cruise. In 2012, all samples were separated into four ecotypes, which is comparable with the historical data from previous years. The Engraulis japonicus was the most abundant species of all teleost fishes. The E. japonicus was captured in every season and contributed the most to the abundance of Ichthyoplankton, which was greater than that of previous years. This result may be due to the periodic fluctuations of E. japonicus or from the displacement of spawning grounds offshore for environmental reasons. The diversity indices of the assemblage were significantly different among seasons, with the number and abundance of the species peaking in the spring, while richness, evenness and diversity indices peaked in the autumn. The species richness of the Ichthyoplankton varied from 0.74 to 1.62, the Pielou evenness index varied from 0.10 to 0.49 and the Shannon–Wiener index varied from 0.19 to 1.04. The results of CCA analysis showed that the major factors affecting the Ichthyoplankton assemblage differed throughout the seasons. Chla was the key factor affecting the Ichthyoplankton in 2012. These seasonal and inter-annual variations likely resulted from migrations associated with fish spawning as well as the environment. Compared with data from previous studies, the relationship between the assemblage structure of Ichthyoplankton and corresponding environmental variables have undergone a decline

  • Autumn Ichthyoplankton assemblage in the Yangtze Estuary shaped by environmental factors
    PeerJ Inc., 2016
    Co-Authors: Hui Zhang, Wei-wei Xian, Shu-de Liu
    Abstract:

    This study investigated the response of the Ichthyoplankton community to environmental changes in the Yangtze Estuary using canonical correspondence analysis. Ichthyoplankton community and environmental data were recorded during the autumns of 1998, 2000, 2002, 2003, 2004, 2007 and 2009. Among the Ichthyoplankton, the dominant larval and juvenile families were the Engraulidae, Gobiidae and Salangidae, and the most common eggs were from Trichiurus lepturus. The Ichthyoplankton was identified via canonical correspondence analysis to three assemblages: an estuary assemblage dominated by Chaeturichthys stigmatias, a coastal assemblage dominated by Engraulis japonicus and Stolephorus commersonii, and an offshore assemblage dominated by Trichiurus lepturus. Regarding environmental factors in the Yangtze Estuary, suspended matter and surface seawater salinity were the main factors influencing the distributions of the different assemblages, while sediment from the Yangtze River during the rainy season and chlorophyll a were the principle drivers of the annual variances in the distribution of Ichthyoplankton assemblages. Our aims in this study were to provide detailed characterizations of the Ichthyoplankton assemblage in the autumns of seven years, examine the long-term dynamics of autumn Ichthyoplankton assemblages, and evaluate the influence of environmental factors on the spatial distribution and inter-annual variations of Ichthyoplankton assemblages associated with the Yangtze Estuary

  • Ichthyoplankton assemblage structure of springs in the yangtze estuary revealed by biological and environmental visions
    PeerJ, 2015
    Co-Authors: Hui Zhang, Wei-wei Xian, Shu-de Liu
    Abstract:

    The Ichthyoplankton assemblage structure in the Yangtze Estuary was analyzed based on four springs in 1999, 2001, 2004 and 2007 in order to provide detailed characterizations of the Ichthyoplankton assemblage in springs, examine the long-term dynamics of spring Ichthyoplankton assemblages, and evaluate the influence of environmental factors on the spatial distribution and inter-annual variations of Ichthyoplankton assemblages associated with the Yangtze Estuary. Forty-two Ichthyoplankton species belonging to 23 families were collected. Engraulidae was the most abundant family, including six species and comprising 67.91% of the total catch. Only four species (Coilia mystus, Engraulis japonicus, Trachidermis fasciatus and Allanetta bleekeri) could be considered dominant, accounting for 88.70% of total abundance. The structure of the Ichthyoplankton spring assemblage persisted on an annual basis, with the dominant species reappearing consistently even though their abundance fluctuated from year to year. This inter-annual variation probably reflects variable environmental conditions influenced by jellyfish blooms, declining river flow, and overfishing. Canonical correspondence analysis indicated aspatial structure of the Ichthyoplankton assemblage in three areas: (1) an inner assemblage dominated by C. mystus; (2) a central assemblage dominated by A. bleekeri and T. fasciatus; and (3) a shelf assemblage featuring E. japonicus. The observed Ichthyoplankton assemblage structure appears to be strongly influenced by depth, salinity and suspended particulate matter gradients.

  • Characteristics of Ichthyoplankton assemblages in Yangtze Estuary and adjacent waters in spring
    Ying yong sheng tai xue bao = The journal of applied ecology, 2008
    Co-Authors: Shu-de Liu, Wei-wei Xian, Dong Liu
    Abstract:

    Based on the investigation data of Ichthyoplankton assemblages and environmental factors in Yangtze Estuary and adjacent waters in May 1999 and 2001, the characteristics of Ichthyoplankton assemblages in these areas in spring were studied by using TWINSPAN (two-way indicator species analysis) and CCA (canonical correspondence analysis). A total of 11 540 Ichthyoplankton individuals were taxonomically identified, belonging to 11 orders, 18 families and 32 species, of which, Coilia mystus, Engraulis japonicus, Chaeturichthys hexanema, Allanetta bleekeri, and Trachidermis fasciatus were the dominant species. The Ichthyoplankton communities were classified into three assemblages by using TWINSPAN, i.e., estuarine assemblage dominated by C. mystus, coastal assemblage dominated by A. bleekeri and T. fasciatus; and shelf assemblage featured by E. japonicus and C. hexanema. The CCA ordination of the interrelations among the three assemblages and their correlations to the environmental variables revealed that salinity, depth, dissolved oxygen, and total suspended particulate matter were the major factors affecting the Ichthyoplankton assemblages in the study areas.

Richard D Brodeur - One of the best experts on this subject based on the ideXlab platform.

  • responses of Ichthyoplankton assemblages to the recent marine heatwave and previous climate fluctuations in several northeast pacific marine ecosystems
    Global Change Biology, 2021
    Co-Authors: Jens M Nielsen, Janet T Duffyanderson, Richard D Brodeur, Lauren A Rogers, Andrew R Thompson, Toby D Auth, Alison L Deary, Moira Galbraith, Anthony J Koslow, Ian R Perry
    Abstract:

    The effects of climate warming on ecosystem dynamics are widespread throughout the world's oceans. In the Northeast Pacific, large-scale climate patterns such as the El Nino/Southern Oscillation and Pacific Decadal Oscillation, and recently unprecedented warm ocean conditions from 2014 to 2016, referred to as a marine heatwave (MHW), resulted in large-scale ecosystem changes. Larval fishes quickly respond to environmental variability and are sensitive indicators of ecosystem change. Categorizing Ichthyoplankton dynamics across marine ecosystem in the Northeast Pacific can help elucidate the magnitude of assemblage shifts, and whether responses are synchronous or alternatively governed by local responses to regional oceanographic conditions. We analyzed time-series data of Ichthyoplankton abundances from four ecoregions in the Northeast Pacific ranging from subarctic to subtropical: the Gulf of Alaska (1981-2017), British Columbia (2001-2017), Oregon (1998-2017), and the southern California Current (1981-2017). We assessed the impact of the recent (2014-2016) MHW and how Ichthyoplankton assemblages responded to past major climate perturbations since 1981 in these ecosystems. Our results indicate that the MHW caused widespread changes in the Ichthyoplankton fauna along the coast of the Northeast Pacific Ocean, but impacts differed between marine ecosystems. For example, abundances for most dominant taxa were at all-time lows since the beginning of sampling in the Gulf of Alaska and British Columbia, while in Oregon and the southern California Current species richness increased as did abundances of species associated with warmer waters. Lastly, species associated with cold waters also increased in abundances close to shore in southern California during the MHW, a pattern that was distinctly different from previous El Nino events. We also found several large-scale, synchronized Ichthyoplankton assemblage composition shifts during past major climate events. Current climate projections suggest that MHWs will become more intense and thus our findings can help project future changes in larval dynamics, allowing for improved ecosystem management decisions.

  • Ichthyoplankton community in the columbia river plume off oregon effects of fluctuating oceanographic conditions
    2008
    Co-Authors: Maria M Parnel, Robert L Emmett, Richard D Brodeur
    Abstract:

    Ichthyoplankton samples were collected at approximately 2-week intervals, primarily during spring and summer 1999−2004, from two stations located 20 and 30 km from shore near the Columbia River, Oregon. Northern anchovy (Engraulis mordax) was the most abundant species collected, and was the primary species associated with summer upwelling conditions, but it showed significant interannual and seasonal fluctuations in abundance and occurrence. Other abundant taxa included sanddabs (Citharichthys spp.), English sole (Parophrys vetulus), and blacksmelts (Bathylagidae). Two-way cluster analysis revealed strong species associations based primarily on season (before or after the spring transition date). Ichthyoplankton abundances were compared to biological and environmental data, and egg and larvae abundances were found to be most correlated with sea surface temperature. The Pacific Decadal Oscillation changed sign (from negative to positive) in late 2002 and indicated overall warmer conditions in the North Pacific Ocean. Climate change is expected to alter ocean upwelling, temperatures, and Columbia River flows, and consequently fish eggs and larvae distributions and survival. Long-term research is needed to identify how Ichthyoplankton and fish recruitment are affected by regional and largescale oceanographic proces

  • regional variation in springtime Ichthyoplankton assemblages in the northeast pacific ocean
    Progress in Oceanography, 2002
    Co-Authors: Miriam J Doyle, Kathryn L Mier, Morgan S Busby, Richard D Brodeur
    Abstract:

    The coastal regions of the northeast Pacific support large, economically valuable fishery resources and provide nursery areas for many fish species. Over the last few decades, there have been dramatic shifts in species abundance and composition in this area. In this paper, we examine the springtime spatial patterns in the Ichthyoplankton of three oceanographically different regions, the Southeast Bering Sea, the Gulf of Alaska and the U.S. West Coast. The data examined are a subset of a larger database (comprising data from cruises conducted from 1972 to 1997) that is being used to investigate spatial, seasonal and interannual patterns in Ichthyoplankton of the northeast Pacific in relation to environmental conditions. Ichthyoplankton were collected during seven cruises using 60-cm bongo nets. Spatial patterns of Ichthyoplankton were examined using both classification and ordination techniques. Relative Bray-Curtis dissimilarity coefficients calculated from the log 10 (n+1) of abundance data were used as input to the numerical classification of species and stations. Nonmetric multidimensional scaling was also applied to the abundance data to examine geometric patterns in the data. The numerical analyses of the species abundance data sets for each cruise revealed spatial patterns in the Ichthyoplankton that suggest the occurrence of geographically distinct assemblages of fish larvae in each region. For all three sampling regions, the assemblage structure is primarily related to bathymetry, and Shelf, Slope, and DeepWater assemblages are described. This shallow to deep-water gradient in species occurrence and abundance reflects the habitat preference and spawning location of the adult fish. Another degree of complexity is superimposed on this primary assemblage structure in each region and seems to be related to local topography and the prevailing current patterns. The patterns in Ichthyoplankton assemblages of the three regions in the northeast Pacific Ocean described here form the basis for future investigations of spatial and temporal patterns in the Ichthyoplankton of the subarctic Pacific. Regional Index Terms: Northeast Pacific Ocean, Southeast Bering Sea, Gulf of Alaska, U.S. West Coast.  2002 Published by Elsevier Science Ltd.

Wei-wei Xian - One of the best experts on this subject based on the ideXlab platform.

  • modelling the potential impacts of climate change on the distribution of Ichthyoplankton in the yangtze estuary china
    Diversity and Distributions, 2020
    Co-Authors: Zhixin Zhang, Wei-wei Xian, Stefano Mammola, Hui Zhang
    Abstract:

    AIM: Species distribution models (SDMs) are an effective tool to explore the potential distribution of terrestrial, freshwater and marine organisms; however, SDMs have been seldom used to model Ichthyoplankton distributions, and thus, our understanding of how larval stages of fishes will respond to climate change is still limited. Here, we developed SDMs to explore potential impacts of climate change on habitat suitability of Ichthyoplankton. LOCATION: Yangtze Estuary, China. METHODS: Using long‐term Ichthyoplankton survey data and a large set of marine predictor variables, we developed ensemble SDMs for five abundant Ichthyoplankton species in the Yangtze Estuary (Coilia mystus, Hypoatherina valenciennei, Larimichthys polyactis, Salanx ariakensis and Chelidonichthys spinosus). Then, we projected their habitat suitability under present and future climate conditions. RESULTS: The ensemble SDMs had good predictive performance and were successful in estimating the known distributions of the five species. Model projections highlighted two contrasting patterns of response to future climates: while C. mystus will likely expand its range, the ranges of the other four species will likely contract and shift northward. MAIN CONCLUSIONS: According to our SDM projections, the five Ichthyoplankton species that we tested in the Yangtze Estuary are likely to respond differently to future climate changes. These projected different responses seemingly reflect the differential functional attributes and life‐history strategies of these species. To the extent that climate change emerges as a critical driver of the future distribution of these species, our findings provide an important roadmap for designing future conservation strategies for Ichthyoplankton in this region.

  • Seasonal variations of the Ichthyoplankton assemblage in the Yangtze Estuary and its relationship with environmental factors
    PeerJ Inc., 2019
    Co-Authors: Hui Zhang, Wei-wei Xian, Shu-de Liu
    Abstract:

    Seasonal variations of the Ichthyoplankton assemblage and its relationship with the environment were analyzed based on four seasonal surveys during 2012. Historical data was collected to be compared with results from previous years in order to indicate the seasonal and inter-annual variation of the Ichthyoplankton assemblage in the Yangtze Estuary and the adjacent waters. A total of 3,688 individuals belonging to 5 orders, 9 families, and 15 species were collected. No samples were collected in the winter cruise. In 2012, all samples were separated into four ecotypes, which is comparable with the historical data from previous years. The Engraulis japonicus was the most abundant species of all teleost fishes. The E. japonicus was captured in every season and contributed the most to the abundance of Ichthyoplankton, which was greater than that of previous years. This result may be due to the periodic fluctuations of E. japonicus or from the displacement of spawning grounds offshore for environmental reasons. The diversity indices of the assemblage were significantly different among seasons, with the number and abundance of the species peaking in the spring, while richness, evenness and diversity indices peaked in the autumn. The species richness of the Ichthyoplankton varied from 0.74 to 1.62, the Pielou evenness index varied from 0.10 to 0.49 and the Shannon–Wiener index varied from 0.19 to 1.04. The results of CCA analysis showed that the major factors affecting the Ichthyoplankton assemblage differed throughout the seasons. Chla was the key factor affecting the Ichthyoplankton in 2012. These seasonal and inter-annual variations likely resulted from migrations associated with fish spawning as well as the environment. Compared with data from previous studies, the relationship between the assemblage structure of Ichthyoplankton and corresponding environmental variables have undergone a decline

  • Autumn Ichthyoplankton assemblage in the Yangtze Estuary shaped by environmental factors
    PeerJ Inc., 2016
    Co-Authors: Hui Zhang, Wei-wei Xian, Shu-de Liu
    Abstract:

    This study investigated the response of the Ichthyoplankton community to environmental changes in the Yangtze Estuary using canonical correspondence analysis. Ichthyoplankton community and environmental data were recorded during the autumns of 1998, 2000, 2002, 2003, 2004, 2007 and 2009. Among the Ichthyoplankton, the dominant larval and juvenile families were the Engraulidae, Gobiidae and Salangidae, and the most common eggs were from Trichiurus lepturus. The Ichthyoplankton was identified via canonical correspondence analysis to three assemblages: an estuary assemblage dominated by Chaeturichthys stigmatias, a coastal assemblage dominated by Engraulis japonicus and Stolephorus commersonii, and an offshore assemblage dominated by Trichiurus lepturus. Regarding environmental factors in the Yangtze Estuary, suspended matter and surface seawater salinity were the main factors influencing the distributions of the different assemblages, while sediment from the Yangtze River during the rainy season and chlorophyll a were the principle drivers of the annual variances in the distribution of Ichthyoplankton assemblages. Our aims in this study were to provide detailed characterizations of the Ichthyoplankton assemblage in the autumns of seven years, examine the long-term dynamics of autumn Ichthyoplankton assemblages, and evaluate the influence of environmental factors on the spatial distribution and inter-annual variations of Ichthyoplankton assemblages associated with the Yangtze Estuary

  • Ichthyoplankton assemblage structure of springs in the yangtze estuary revealed by biological and environmental visions
    PeerJ, 2015
    Co-Authors: Hui Zhang, Wei-wei Xian, Shu-de Liu
    Abstract:

    The Ichthyoplankton assemblage structure in the Yangtze Estuary was analyzed based on four springs in 1999, 2001, 2004 and 2007 in order to provide detailed characterizations of the Ichthyoplankton assemblage in springs, examine the long-term dynamics of spring Ichthyoplankton assemblages, and evaluate the influence of environmental factors on the spatial distribution and inter-annual variations of Ichthyoplankton assemblages associated with the Yangtze Estuary. Forty-two Ichthyoplankton species belonging to 23 families were collected. Engraulidae was the most abundant family, including six species and comprising 67.91% of the total catch. Only four species (Coilia mystus, Engraulis japonicus, Trachidermis fasciatus and Allanetta bleekeri) could be considered dominant, accounting for 88.70% of total abundance. The structure of the Ichthyoplankton spring assemblage persisted on an annual basis, with the dominant species reappearing consistently even though their abundance fluctuated from year to year. This inter-annual variation probably reflects variable environmental conditions influenced by jellyfish blooms, declining river flow, and overfishing. Canonical correspondence analysis indicated aspatial structure of the Ichthyoplankton assemblage in three areas: (1) an inner assemblage dominated by C. mystus; (2) a central assemblage dominated by A. bleekeri and T. fasciatus; and (3) a shelf assemblage featuring E. japonicus. The observed Ichthyoplankton assemblage structure appears to be strongly influenced by depth, salinity and suspended particulate matter gradients.

  • Characteristics of Ichthyoplankton assemblages in Yangtze Estuary and adjacent waters in spring
    Ying yong sheng tai xue bao = The journal of applied ecology, 2008
    Co-Authors: Shu-de Liu, Wei-wei Xian, Dong Liu
    Abstract:

    Based on the investigation data of Ichthyoplankton assemblages and environmental factors in Yangtze Estuary and adjacent waters in May 1999 and 2001, the characteristics of Ichthyoplankton assemblages in these areas in spring were studied by using TWINSPAN (two-way indicator species analysis) and CCA (canonical correspondence analysis). A total of 11 540 Ichthyoplankton individuals were taxonomically identified, belonging to 11 orders, 18 families and 32 species, of which, Coilia mystus, Engraulis japonicus, Chaeturichthys hexanema, Allanetta bleekeri, and Trachidermis fasciatus were the dominant species. The Ichthyoplankton communities were classified into three assemblages by using TWINSPAN, i.e., estuarine assemblage dominated by C. mystus, coastal assemblage dominated by A. bleekeri and T. fasciatus; and shelf assemblage featured by E. japonicus and C. hexanema. The CCA ordination of the interrelations among the three assemblages and their correlations to the environmental variables revealed that salinity, depth, dissolved oxygen, and total suspended particulate matter were the major factors affecting the Ichthyoplankton assemblages in the study areas.

J. F. Renno - One of the best experts on this subject based on the ideXlab platform.

  • Metabarcoding by capture using a single COI probe (MCSP) to identify and quantify fish species in Ichthyoplankton swarms
    PLoS ONE, 2018
    Co-Authors: C. Mariac, Y. Vigouroux, F. Duponchelle, E. Desmarais, J. Nunez, C. García-dávila, J. F. Renno
    Abstract:

    The ability to determine the composition and relative frequencies of fish species in large Ichthyoplankton swarms could have extremely important ecological applications However, this task is currently hampered by methodological limitations. We proposed a new method for Amazonian species based on hybridization capture of the COI gene DNA from a distant species (Danio rerio), absent from our study area (the Amazon basin). The COI sequence of this species is approximately equidistant from all COI of Amazonian species available. By using this sequence as probe we successfully facilitated the simultaneous identification of fish larvae belonging to the order Siluriformes and to the Characiformes represented in our Ichthyoplankton samples. Species relative frequencies, estimated by the number of reads, showed almost perfect correlations with true frequencies estimated by a Sanger approach, allowing the development of a quantitative approach. We also proposed a further improvement to a previous protocol, which enables lowering the sequencing effort by 40 times. This new Metabarcoding by Capture using a Single Probe (MCSP) methodology could have important implications for ecology, fisheries management and conservation in fish biodiversity hotspots worldwide. Our approach could easily be extended to other plant and animal taxa.

  • DNA Metabarcoding of Amazonian Ichthyoplankton Swarms
    PLoS ONE, 2017
    Co-Authors: M.e. Maggia, Y. Vigouroux, J. F. Renno, F. Duponchelle, E. Desmarais, J. Nunez, C. García-dávila, F. M. Carvajal-vallejos, E. Paradis, Jean-françois Martin
    Abstract:

    Tropical rainforests harbor extraordinary biodiversity. The Amazon basin is thought to hold 30% of all river fish species in the world. Information about the ecology, reproduction, and recruitment of most species is still lacking, thus hampering fisheries management and successful conservation strategies. One of the key understudied issues in the study of population dynamics is recruitment. Fish larval ecology in tropical biomes is still in its infancy owing to identification difficulties. Molecular techniques are very promising tools for the identification of larvae at the species level. However, one of their limits is obtaining individual sequences with large samples of larvae. To facilitate this task, we developed a new method based on the massive parallel sequencing capability of next generation sequencing (NGS) coupled with hybridization capture. We focused on the mitochondrial marker cytochrome oxidase I (COI). The results obtained using the new method were compared with individual larval sequencing. We validated the ability of the method to identify Amazonian catfish larvae at the species level and to estimate the relative abundance of species in batches of larvae. Finally, we applied the method and provided evidence for strong temporal variation in reproductive activity of catfish species in the Ucayalí River in the Peruvian Amazon. This new time and cost effective method enables the acquisition of large datasets, paving the way for a finer understanding of reproductive dynamics and recruitment patterns of tropical fish species, with major implications for fisheries management and conservation.