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Assessing vulnerability of freshwater minnows in the Gangetic floodplains of India for conservation and management: Anthropogenic or climatic change risk?
Climate Risk Management ( IF 4.4 ) Pub Date : 2021-05-18 , DOI: 10.1016/j.crm.2021.100325
Uttam Kumar Sarkar , Koushik Roy , Malay Naskar , Gunjan Karnatak , Mishal Puthiyottil , Singdha Baksi , Suman Kumari , Lianthuamluia Lianthuamluia , Basanta Kumar Das

Minnows are the most ignored yet indispensable group of freshwater fishes in Asian inland waters. The reproductive resilience of minnows facing climatic variability, using a wetland inhabiting species Amblypharyngodon mola (Mola carplets) in lower Indo-Gangetic floodplains, was validated. Results revealed that spawning decision in females (threshold gonadosomatic index ≥ 5 units) is neither cued by water temperature nor rainfall. They can maintain pre-spawning fitness (condition factor 1.12–1.25 units) within a broad temperature (22–33 °C) and rainfall (0–800 mm) window by active feeding, thus no risk of skipped spawning decisions while facing future climatic variabilities. Present breeding phenology (May-December) might have prolonged in the recent decade, especially the tail-end, concomitant with increasingly hot and rainy monsoon (May-August) and warmer post-monsoon months (September-December). Minnows are expected to prosper in a future climatic scenario, contributing to ecosystem balance (algal grazers) and regional food security. Female first maturity (♀ puberty) was encountered at 4.7–5.1 cm total length, hinting at a probable increase in the recent decade. Climate-favored prolonged recruitment window, in absence of extreme fishing pressure (currently), might have led to such pattern. However, this state might be temporary and labile. Minnows may soon get altered to earlier puberty (=warning sign of stock collapse) if fishing pressure intensifies under a reproductively favoring climate progression. Threshold body girth for spawning females was estimated at 3.2–3.4 cm (+17% than non-breeding ones). Fishing nets having mesh sizes (=total circumference) at least > 32–34 mm will most likely be the key to minnows’ endurance or survival in the coming decades.



中文翻译:

评估印度恒河泛滥平原淡水min鱼的脆弱性,以进行保护和管理:人为或气候变化风险?

now鱼是亚洲内陆水域中最被忽视但必不可少的淡水鱼类。利用湿地栖息物种Amblypharyngodon mola面对气候变化的min鱼的生殖适应力印支江下游平原上的(莫拉carp鱼)得到了验证。结果表明,雌性(阈值性腺机体指数≥5个单位)的产卵决定不受水温和降雨的影响。他们可以通过主动喂养在较宽的温度(22–33°C)和降雨量(0–800 mm)的范围内维持产卵前适应度(条件因子1.12–1.25单位),因此在面对未来气候时不会有跳过产卵决策的风险变异性。目前的育种物候(5月至12月)可能已在最近十年中延长,尤其是尾端,同时伴随着越来越炎热多雨的季风(5月至8月)和季风后的几个月(9月至12月)变暖。now鱼有望在未来的气候环境中繁荣发展,为生态系统平衡(藻类放牧者)和区域粮食安全做出贡献。女性首次成熟(青春期)的全长为4.7-5.1 cm,这暗示着最近十年的可能增长。在目前没有极端捕鱼压力的情况下,气候有利的延长征聘窗口可能导致了这种情况。但是,这种状态可能是暂时的并且不稳定。如果在有利于繁殖的气候发展条件下捕捞压力加剧,now鱼可能很快就会转变为早熟的青春期(=种群崩溃的警告信号)。产卵雌性的门槛周长估计为3.2-3.4 cm(比非繁殖性雌虾高17%)。网眼尺寸(=总周长)至少> 32-34 mm的渔网很可能是未来几十年小鱼生存或生存的关键。在目前没有极端捕鱼压力的情况下,气候有利的延长征聘窗口可能导致了这种情况。但是,这种状态可能是暂时的并且不稳定。如果在有利于繁殖的气候发展条件下捕捞压力加剧,now鱼可能很快就会转变为早熟的青春期(=种群崩溃的警告信号)。产卵雌性的门槛周长估计为3.2-3.4 cm(比非繁殖性雌虾高17%)。网眼尺寸(=总周长)至少> 32-34 mm的渔网很可能是未来几十年小鱼生存或生存的关键。在目前没有极端捕鱼压力的情况下,气候有利的延长征聘窗口可能导致了这种情况。但是,这种状态可能是暂时的并且不稳定。如果在有利于繁殖的气候发展条件下捕捞压力加剧,now鱼可能很快就会转变为早熟的青春期(=种群崩溃的警告信号)。产卵雌性的门槛周长估计为3.2-3.4 cm(比非繁殖性雌虾高17%)。网眼尺寸(=总周长)至少> 32-34 mm的渔网很可能是未来几十年小鱼生存或生存的关键。如果在有利于繁殖的气候发展条件下捕捞压力加剧,now鱼可能很快就会转变为早熟的青春期(=种群崩溃的警告信号)。产卵雌性的门槛周长估计为3.2-3.4厘米(比非育种雌鸟的门槛高17%)。网眼尺寸(=总周长)至少> 32-34 mm的渔网很可能是未来几十年小鱼生存或生存的关键。如果在有利于繁殖的气候发展条件下捕捞压力加剧,now鱼可能很快就会转变为早熟的青春期(=种群崩溃的警告信号)。产卵雌性的门槛周长估计为3.2-3.4 cm(比非繁殖性雌虾高17%)。网眼尺寸(=总周长)至少> 32-34 mm的渔网很可能是未来几十年小鱼生存或生存的关键。

更新日期:2021-05-24
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