Formation of Adaptive Trophic Niches of Euryphagous Fish Species in Response to Off-Seasonal Water Level Regulation in Hongze Lake
Off-seasonal water level regulations disrupt the biological traits and phenological rhythms of native fish species, yet their impacts on interspecific trophic interactions remain understudied. This study employed stable isotope analysis to assess the trophic dynamics of three fish species (<i>...
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2024-12-01
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| author | Si Luo Zexin Wang Shengyu Zhang Huan Mu Yubin Jiao Xiao Qu Qishuo Wang Ruiqi Yang Yanxia Zuo Shiyu Jin |
| author_facet | Si Luo Zexin Wang Shengyu Zhang Huan Mu Yubin Jiao Xiao Qu Qishuo Wang Ruiqi Yang Yanxia Zuo Shiyu Jin |
| author_sort | Si Luo |
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| description | Off-seasonal water level regulations disrupt the biological traits and phenological rhythms of native fish species, yet their impacts on interspecific trophic interactions remain understudied. This study employed stable isotope analysis to assess the trophic dynamics of three fish species (<i>Parabramis pekinensis</i>, <i>Carassius auratus</i>, and <i>Toxabramis swinhonis</i>) across different water periods in Hongze Lake. The findings revealed that all three species occupied similar mid-level trophic positions, with no significant difference among water periods (<i>p</i> > 0.05). During high-water periods, <i>P. pekinensis</i> and <i>T. swinhonis</i> exploited broader niches, while <i>C. auratus</i> relied on a narrower diet. In contrast, during low-water periods, <i>C. auratus</i> expanded its niche, while <i>P. pekinensis</i> and <i>T. swinhonis</i> reduced their isotopic niche widths. Niche overlap analysis showed minimal trophic overlap among the three species during high-water periods, with increased overlap during low-water periods, except for the highest overlap between <i>C. auratus</i> and <i>T. swinhonis</i> during mid-water periods. This variation in niche overlap aligns with shifts in dietary reliance, as POM was the predominant dietary component for all three species, but its contribution varied significantly across different water periods. These findings indicated that adaptive trophic niche facilitated the coexistence of these fish species, while off-seasonal water level regulation may intensify interspecific competition. These insights are essential for refining water management policies and developing sustainable fishery management strategies of Hongze Lake and other water-level-regulated systems. |
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| institution | Kabale University |
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| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-815079f35f7c4d40a8c545b51102d8f52025-01-10T13:13:56ZengMDPI AGAnimals2076-26152024-12-011515910.3390/ani15010059Formation of Adaptive Trophic Niches of Euryphagous Fish Species in Response to Off-Seasonal Water Level Regulation in Hongze LakeSi Luo0Zexin Wang1Shengyu Zhang2Huan Mu3Yubin Jiao4Xiao Qu5Qishuo Wang6Ruiqi Yang7Yanxia Zuo8Shiyu Jin9School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huai’an 223003, ChinaSchool of Life Science and Food Engineering, Huaiyin Institute of Technology, Huai’an 223003, ChinaHongze Lake Fisheries Management Committee Office, Huai’an 223003, ChinaHongze Lake Fisheries Management Committee Office, Huai’an 223003, ChinaSchool of Life Science and Food Engineering, Huaiyin Institute of Technology, Huai’an 223003, ChinaState Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, ChinaState Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, ChinaSchool of Life Science and Food Engineering, Huaiyin Institute of Technology, Huai’an 223003, ChinaState Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, ChinaSchool of Life Science and Food Engineering, Huaiyin Institute of Technology, Huai’an 223003, ChinaOff-seasonal water level regulations disrupt the biological traits and phenological rhythms of native fish species, yet their impacts on interspecific trophic interactions remain understudied. This study employed stable isotope analysis to assess the trophic dynamics of three fish species (<i>Parabramis pekinensis</i>, <i>Carassius auratus</i>, and <i>Toxabramis swinhonis</i>) across different water periods in Hongze Lake. The findings revealed that all three species occupied similar mid-level trophic positions, with no significant difference among water periods (<i>p</i> > 0.05). During high-water periods, <i>P. pekinensis</i> and <i>T. swinhonis</i> exploited broader niches, while <i>C. auratus</i> relied on a narrower diet. In contrast, during low-water periods, <i>C. auratus</i> expanded its niche, while <i>P. pekinensis</i> and <i>T. swinhonis</i> reduced their isotopic niche widths. Niche overlap analysis showed minimal trophic overlap among the three species during high-water periods, with increased overlap during low-water periods, except for the highest overlap between <i>C. auratus</i> and <i>T. swinhonis</i> during mid-water periods. This variation in niche overlap aligns with shifts in dietary reliance, as POM was the predominant dietary component for all three species, but its contribution varied significantly across different water periods. These findings indicated that adaptive trophic niche facilitated the coexistence of these fish species, while off-seasonal water level regulation may intensify interspecific competition. These insights are essential for refining water management policies and developing sustainable fishery management strategies of Hongze Lake and other water-level-regulated systems.https://www.mdpi.com/2076-2615/15/1/59SEAcniche overlapwater level fluctuationsspecies coexistencestable isotope analysis |
| spellingShingle | Si Luo Zexin Wang Shengyu Zhang Huan Mu Yubin Jiao Xiao Qu Qishuo Wang Ruiqi Yang Yanxia Zuo Shiyu Jin Formation of Adaptive Trophic Niches of Euryphagous Fish Species in Response to Off-Seasonal Water Level Regulation in Hongze Lake Animals SEAc niche overlap water level fluctuations species coexistence stable isotope analysis |
| title | Formation of Adaptive Trophic Niches of Euryphagous Fish Species in Response to Off-Seasonal Water Level Regulation in Hongze Lake |
| title_full | Formation of Adaptive Trophic Niches of Euryphagous Fish Species in Response to Off-Seasonal Water Level Regulation in Hongze Lake |
| title_fullStr | Formation of Adaptive Trophic Niches of Euryphagous Fish Species in Response to Off-Seasonal Water Level Regulation in Hongze Lake |
| title_full_unstemmed | Formation of Adaptive Trophic Niches of Euryphagous Fish Species in Response to Off-Seasonal Water Level Regulation in Hongze Lake |
| title_short | Formation of Adaptive Trophic Niches of Euryphagous Fish Species in Response to Off-Seasonal Water Level Regulation in Hongze Lake |
| title_sort | formation of adaptive trophic niches of euryphagous fish species in response to off seasonal water level regulation in hongze lake |
| topic | SEAc niche overlap water level fluctuations species coexistence stable isotope analysis |
| url | https://www.mdpi.com/2076-2615/15/1/59 |
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