Seasonal changes in fish diversity, density, biomass, and assemblage alongside environmental variables in the Yangtze River Estuary

Kindong, Richard; Wu, Jing; Gao, Chunxia; Dai, Libin; Tian, Shu; Dai, Xiaojie; Chen, Jinhui

doi:10.1007/s11356-020-08674-8

Cited by 24 publications

(15 citation statements)

References 47 publications

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“…The sustainable use and protection of the Yangtze Estuary has become the focus of attention [1]. Understanding and monitoring its fish resources are prerequisites for the estuary's protection [3]. However, because of the large range of many marine fishes and the changeable aquatic environment, their occurrence and distribution are not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variation and Assessment of Fish Resources in the Yangtze Estuary Based on Environmental DNA

Jia

Wang

Yoshizawa

et al. 2020

Water

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In the past few years, environmental DNA (eDNA) techniques have been used to monitor marine communities. Research indicates that eDNA is an effective tool for monitoring fishery resources. This study analyzed the seasonal variations in fish resources in the Yangtze Estuary, China, using eDNA. A total of 103 water samples were collected from the Yangtze Estuary across the four seasons in 2019—27 samples in February, 20 in May, 28 in August and 28 in November. Our research successfully detected the fishery resources of the Yangtze Estuary. We found significant differences according to the season. The results showed that 59 species were identified in 2019 (20 in February, 16 in May, 5 in August and 45 in November) and fish species varied widely over the four seasons. Furthermore, our samples revealed significant differences in annual fish stocks in the Yangtze Estuary, compared with eDNA data from 2018 and with traditional surveys from past years. Overall, eDNA is a useful emerging tool to assist with monitoring and protecting fish resources for the Yangtze Estuary.

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Section: Introductionmentioning

confidence: 99%

Seasonal Variation and Assessment of Fish Resources in the Yangtze Estuary Based on Environmental DNA

Jia

Wang

Yoshizawa

et al. 2020

Water

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“…1592 had stronger fronts (Figures 8 and 9) and higher Chl a concentrations (Figure 10) in 2017 as compared to other years. Usually, a strong front is characterized by abundant nutrients and high primary productivity [61][62][63][64], which provides a suitable habitat for fish [48,65]. Figure 12 shows the interannual variation in nighttime light intensity, average SST, front intensity, and Chl a concentrations for area B over the period 2013-2019.…”

Section: Discussionmentioning

confidence: 99%

Unusual Fish Assemblages Associated with Environmental Changes in the East China Sea in February and March 2017

Ding

Zhang

et al. 2021

Remote Sensing

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Two large fish assemblages were recorded in the overwintering fishing grounds of the East China Sea in February and March 2017. In this study, available time series of satellite-derived sea surface temperature, wind, chlorophyll a, and reanalysis data were used to explore the relationships between the observed large fish aggregations and environmental factors. The bottom waters of the fishing grounds were abnormally warm in winter 2017, and then experienced significant cooling due to the eastward movement of the Yellow Sea Cold Current, which was driven by the increased northwesterly wind from January to mid-March 2017. Fishing areas in the affected region, including No. 1891, which was abnormally warm, and No. 1592, which had a strong thermal front and high chlorophyll a concentration, might have provided suitable environments for the warm-temperature fish, resulting in the observed large fish assemblages. The abnormal temperature changes between winter and early spring 2017 may have been associated with changes in local ocean circulation.

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“…A grande proporção de O. oglinum foi em decorrência de alguns fatores, o primeiro e já anteriormente mencionado foi em relação ao petrecho (seletividade e eficiência), o segundo diz respeito ao conhecimento empírico dos pescadores em relação à dinâmica no CSC, que conseguem detectar os cardumes de O. oglinum, espécie alvo das capturas na localidade. Além disso, as assembleias de peixes em ambientes estuarinos são dominadas por espécies que incluem as famílias Clupeidae e Engraulidae (MONTELEONE, 1992;RAMOS et al, 2006;KINDONG et al, 2020). Na família Engraulide, a espécie A. clupeoides foi a que mais se destacou e larvas dessa família foram dominantes no CSC (EKAU et al, 2001), o que justifica o aparecimento de algumas espécies entre as mais capturadas, apesar de elas não serem alvo, o que muitas vezes acarreta capturas subaproveitadas ou mesmo descartes no porto por não terem valor comercial (LIMA, observação pessoal).…”

Section: Discussionunclassified

“…A clara dominância da espécie O. oglinum afetou as estimativas dos índices de diversidade, tanto nos estratos temporais quanto nos espaciais. Na diversidade de Shannon-Weaver, geralmente, os valores calculados são subestimados em situações em que as comunidades de peixes têm espécies dominantes (SALAS et al 2006;KAMRANI et al, 2015;KINDONG et al, 2020). Os valores dos índices de Simpson e Pielou foram baixos neste trabalho, principalmente nas ocasiões em que O. oglinum predominou, assim evidenciando a dominância desta e a baixa equidade da distribuição entre as espécies, respectivamente.…”

Section: Discussionunclassified

Diversidade das pescarias realizadas com rede de emalhar em um estuário tropical do nordeste do Brasil

et al. 2021

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O objetivo neste trabalho foi estudar a diversidade da ictiofauna capturada com a rede de emalhar mais utilizada no estado de Pernambuco. No total foram realizadas 14 coletas no Canal de Santa Cruz (CSC) entre os meses de julho de 2013 e junho de 2014. As amostras foram obtidas com rede de emalhar de malha de 30 mm. Os peixes capturados foram retirados e separados na posição margem e centro, e na posição vertical da rede (superior, meio e inferior). Quanto à frequência de ocorrência, as espécies foram classificadas como comuns, acessórias ou ocasionais. Foram realizadas análises de diversidade alfa e beta. No total foram capturadas 19 espécies, sendo Opisthonema oglinum e Anchovia clupeoides as únicas constantes. As diversidades alfa estimadas não apresentaram diferenças significativas nos estratos temporais e espaciais. Na diversidade beta dois grupos se distinguiram, sendo que no maior ocorreu geralmente grandes abundâncias de O. oglinum. A rede avaliada foi eficiente para a espécie alvo O. oglinum e as capturas de outras espécies corresponderam a menos de 13% da icitiofauna já encontrada no CSC. Portanto, medidas de gestão que visem restringir o uso do petrecho para a proteção da diversidade, considerando a sazonalidade e espacialidade no canal, não são recomendadas.

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Seasonal changes in fish diversity, density, biomass, and assemblage alongside environmental variables in the Yangtze River Estuary

Cited by 24 publications

References 47 publications

Seasonal Variation and Assessment of Fish Resources in the Yangtze Estuary Based on Environmental DNA

Seasonal Variation and Assessment of Fish Resources in the Yangtze Estuary Based on Environmental DNA

Unusual Fish Assemblages Associated with Environmental Changes in the East China Sea in February and March 2017

Diversidade das pescarias realizadas com rede de emalhar em um estuário tropical do nordeste do Brasil

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