Dataset Information

Age, growth, mortality and recruitment of thin sharpbelly Toxabramis swinhonis Gunther, 1873 in three shallow lakes along the middle and lower reaches of the Yangtze River basin, China.

ABSTRACT: Despite being the most dominant and widespread small fish species in the lakes along the middle and lower reaches of the Yangtze River basin, Toxabramis swinhonis has been paid little attention by fisheries scientists and little is known about its population characteristics. For this reason, we estimated age, growth, mortality and recruitment of this species based on three shallow lakes, Biandantang Lake, Shengjin Lake and Kuilei Lake (BDT, SJH and KLH, respectively) in this region. A total of 13,585 (8,818 in BDT, 2,207 in SJH and 2,560 in KLH) individuals were collected during monthly sampling from July 2016 to September 2017. The results revealed that the age structures of T. swinhonis consisted of four age groups (0⁺-3⁺), with 0⁺-1⁺ year old fish comprising more than 98% of the samples. Allometric growth patterns were displayed by fish from all sampling sites and the von Bertalanffy growth functions estimated were L _t = 173.25 (1 - e^{-1.20 (t + 1.09)}): BDT; L _t = 162.75 (1 - e^{-1.20 (t + 1.08)}): SJH and L _t = 215.25 (1 - e^{-1.20 (t + 1.12)}): KLH, respectively. The rates of total mortality (Z), natural mortality (M) and fishing mortality (F) at BDT, SJH and KLH were computed as 5.82, 5.50 and 4.55 year^-1; 1.89, 1.87 and 1.75 year^-1; 3.93, 3.63 and 2.80 year^-1, respectively. Meanwhile, growth performance indices (?') were 0.68 (in BDT), 0.66 (in SJH) and 0.62 (in KLH), which indicated that T. swinhonis were overfished slightly in all study areas. Area-specific recruitment patterns were similar to each other, displaying evidence of batch spawning, with major peaks in April and August, accounting for 92.21% (BDT), 88.21% (SJH) and 88.73% (KLH) of total recruitment, respectively. These results showed that brief generation-time, fast growth rate, relatively high natural mortality rate and strong reproductive capacity (r-strategies) are reasons why this species became the most dominant species in many lakes of China.

SUBMITTER: Dong X

PROVIDER: S-EPMC6464026 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Publications

Age, growth, mortality and recruitment of thin sharpbelly <i>Toxabramis swinhonis</i> Günther, 1873 in three shallow lakes along the middle and lower reaches of the Yangtze River basin, China.

Dong Xianghong X Xiang Tao T Ju Tao T Li Ruojing R Ye Shaowen S Lek Sovan S Liu Jiashou J Grenouillet Gaël G

PeerJ 20190412

Despite being the most dominant and widespread small fish species in the lakes along the middle and lower reaches of the Yangtze River basin, <i>Toxabramis swinhonis</i> has been paid little attention by fisheries scientists and little is known about its population characteristics. For this reason, we estimated age, growth, mortality and recruitment of this species based on three shallow lakes, Biandantang Lake, Shengjin Lake and Kuilei Lake (BDT, SJH and KLH, respectively) in this region. A tot ...[more]

PMID: 31011492

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Project description:The revolution of molecular techniques has revealed that the composition of natural bacterial communities normally includes a few abundant taxa and many rare taxa. Unraveling the mechanisms underlying the spatial assembly process of both abundant and rare bacterial taxa has become a central goal in microbial ecology. Here, we used high-throughput sequencing to explore geographic patterns and the relative importance of ecological processes in the assembly of abundant and rare bacterial subcommunities from 25 lakes across the middle and lower reaches of Yangtze River basin (MLYB), located in Southeast China, where most of the lakes are interconnected by river networks. We found similar biogeographic patterns of abundant and rare subcommunities which could significantly distinguish the community compositions of the two lake groups that were far from each other but which could not distinguish the community compositions of the nearby lakes. Both abundant and rare bacteria followed a strong distance-decay relationship. These findings suggest that the interconnectivity between lakes homogenizes the bacterial communities in local areas, and the abundant and rare taxa therein may be affected by the same ecological process. In addition, based on the measured environmental variables, the deterministic processes explain a small fraction of variation within both abundant and rare subcommunities, while both neutral and null models revealed a high stochasticity ratio for the spatial distribution patterns of both abundant and rare taxa. These findings indicate that the stochastic processes exhibited a greater influence on both abundant and rare bacterial subcommunity assemblies among interconnected lakes.IMPORTANCE The middle and lower Yangtze Plain is a typical floodplain in which many lakes connect with each other, especially in the wet season. More importantly, with the frequent change of regional water level in the wet season, there is a mutual hydrodynamic exchange among these lakes. The microbial biogeography among these interconnected lakes is still poorly understood. This study aims to unravel the mechanisms underlying the assembly process of abundant and rare bacteria among the interconnected lakes in the middle and lower Yangtze Plain. Our findings will provide a deeper understanding of the biogeographic patterns of rare and abundant bacterial taxa and their determined processes among interconnected aquatic habitats.

Dataset Information

Age, growth, mortality and recruitment of thin sharpbelly Toxabramis swinhonis Gunther, 1873 in three shallow lakes along the middle and lower reaches of the Yangtze River basin, China.

Publications

Age, growth, mortality and recruitment of thin sharpbelly <i>Toxabramis swinhonis</i> Günther, 1873 in three shallow lakes along the middle and lower reaches of the Yangtze River basin, China.

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