Albacore tuna(Thunnus alalunga)is one of the target species of tuna longline fishing,and waters near the Cook Islands are a vital albacore tuna fishing ground.Marine environmental data are usually presented with diffe...Albacore tuna(Thunnus alalunga)is one of the target species of tuna longline fishing,and waters near the Cook Islands are a vital albacore tuna fishing ground.Marine environmental data are usually presented with different spatial resolutions,which leads to different results in tuna fishery prediction.Study on the impact of different spatial resolutions on the prediction accuracy of albacore tuna fishery to select the best spatial resolution can contribute to better management of albacore tuna resources.The nominal catch per unit effort(CPUE)of albacore tuna is calculated according to vessel monitor system(VMS)data collected from Chinese distantwater fishery enterprises from January 1,2017 to May 31,2021.A total of 26 spatiotemporal and environmental factors,including temperature,salinity,dissolved oxygen of 0–300 m water layer,chlorophyll-a concentration in the sea surface,sea surface height,month,longitude,and latitude,were selected as variables.The temporal resolution of the variables was daily and the spatial resolutions were set to be 0.5°×0.5°,1°×1°,2°×2°,and 5°×5°.The relationship between the nominal CPUE and each individual factor was analyzed to remove the factors irrelavant to the nominal CPUE,together with a multicollinearity diagnosis on the factors to remove factors highly related to the other factors within the four spatial resolutions.The relationship models between CPUE and spatiotemporal and environmental factors by four spatial resolutions were established based on the long short-term memory(LSTM)neural network model.The mean absolute error(MAE)and root mean square error(RMSE)were used to analyze the fitness and accuracy of the models,and to determine the effects of different spatial resolutions on the prediction accuracy of the albacore tuna fishing ground.The results show the resolution of 1°×1°can lead to the best prediction accuracy,with the MAE and RMSE being 0.0268 and 0.0452 respectively,followed by 0.5°×0.5°,2°×2°and 5°×5°with declining prediction accuracy.The results suggested that 1)albacore tuna fishing ground can be predicted by LSTM;2)the VMS records the data in detail and can be used scientifically to calculate the CPUE;3)correlation analysis,and multicollinearity diagnosis are necessary to improve the prediction accuracy of the model;4)the spatial resolution should be 1°×1°in the forecast of albacore tuna fishing ground in waters near the Cook Islands.展开更多
目的对比加速康复外科(enhanced recovery after surgery,ERAS)方案和常规康复外科(conventional recovery after surgery,CRAS)方案在腹腔镜泌尿外科上尿路手术中的安全性和有效性。方法收集本中心2016年6月至2017年9月行腹腔镜泌尿外...目的对比加速康复外科(enhanced recovery after surgery,ERAS)方案和常规康复外科(conventional recovery after surgery,CRAS)方案在腹腔镜泌尿外科上尿路手术中的安全性和有效性。方法收集本中心2016年6月至2017年9月行腹腔镜泌尿外科上尿路手术治疗的患者共62例,其中2016年6月至2017年5月,33例采用CRAS方案,2017年5月至2017年9月29例采用ERAS方案。两组患者年龄、体质量指数、中位查尔森合并症指数、中位麻醉评分及术前实验室检查等差异均无统计学意义。对两组患者的围术期资料和术后30 d内的合并症进行比较。结果所有手术均顺利完成。两组患者在术中入晶体液量[1 000(525~1 100) mL vs 1 100(1 000~1 350) mL]、术中入胶体液量[500(500~500) mL vs 500(500~1 000) mL]、胃管拔出时间[0 d vs 1(1~1) d]、恢复普食时间[1(1~2) d vs 2(1~3) d]差异有统计学意义(P <0. 05)。在手术时间、术中出血量、引流管拔出时间、术后住院时间、腹腔镜术式构成比例等方面均差异无统计学意义(P> 0. 05)。ERAS方案组和CRAS方案组分别有3例(10. 3%)和5例(15. 2%) Clavien-Dindo 1级合并症,差异不具有统计学意义(P=0. 573)。两组均无患者术后再入院。结论 ERAS方案对比CRAS方案可以在不增加合并症的基础上缩短患者恢复普通饮食时间,推进患者术后康复,在腹腔镜泌尿外科上尿路手术中的应用是安全和可行的,但还需要大样本量随机对照研究进行全面评估。展开更多
基金the National Natural Science Foundation of China(No.32273185)the National Key R&D Program of China(No.2020YFD0901205)the Marine Fishery Resources Investigation and Exploration Program of the Ministry of Agriculture and Rural Affairs of China in 2021(No.D-8006-21-0215)。
文摘Albacore tuna(Thunnus alalunga)is one of the target species of tuna longline fishing,and waters near the Cook Islands are a vital albacore tuna fishing ground.Marine environmental data are usually presented with different spatial resolutions,which leads to different results in tuna fishery prediction.Study on the impact of different spatial resolutions on the prediction accuracy of albacore tuna fishery to select the best spatial resolution can contribute to better management of albacore tuna resources.The nominal catch per unit effort(CPUE)of albacore tuna is calculated according to vessel monitor system(VMS)data collected from Chinese distantwater fishery enterprises from January 1,2017 to May 31,2021.A total of 26 spatiotemporal and environmental factors,including temperature,salinity,dissolved oxygen of 0–300 m water layer,chlorophyll-a concentration in the sea surface,sea surface height,month,longitude,and latitude,were selected as variables.The temporal resolution of the variables was daily and the spatial resolutions were set to be 0.5°×0.5°,1°×1°,2°×2°,and 5°×5°.The relationship between the nominal CPUE and each individual factor was analyzed to remove the factors irrelavant to the nominal CPUE,together with a multicollinearity diagnosis on the factors to remove factors highly related to the other factors within the four spatial resolutions.The relationship models between CPUE and spatiotemporal and environmental factors by four spatial resolutions were established based on the long short-term memory(LSTM)neural network model.The mean absolute error(MAE)and root mean square error(RMSE)were used to analyze the fitness and accuracy of the models,and to determine the effects of different spatial resolutions on the prediction accuracy of the albacore tuna fishing ground.The results show the resolution of 1°×1°can lead to the best prediction accuracy,with the MAE and RMSE being 0.0268 and 0.0452 respectively,followed by 0.5°×0.5°,2°×2°and 5°×5°with declining prediction accuracy.The results suggested that 1)albacore tuna fishing ground can be predicted by LSTM;2)the VMS records the data in detail and can be used scientifically to calculate the CPUE;3)correlation analysis,and multicollinearity diagnosis are necessary to improve the prediction accuracy of the model;4)the spatial resolution should be 1°×1°in the forecast of albacore tuna fishing ground in waters near the Cook Islands.
文摘目的对比加速康复外科(enhanced recovery after surgery,ERAS)方案和常规康复外科(conventional recovery after surgery,CRAS)方案在腹腔镜泌尿外科上尿路手术中的安全性和有效性。方法收集本中心2016年6月至2017年9月行腹腔镜泌尿外科上尿路手术治疗的患者共62例,其中2016年6月至2017年5月,33例采用CRAS方案,2017年5月至2017年9月29例采用ERAS方案。两组患者年龄、体质量指数、中位查尔森合并症指数、中位麻醉评分及术前实验室检查等差异均无统计学意义。对两组患者的围术期资料和术后30 d内的合并症进行比较。结果所有手术均顺利完成。两组患者在术中入晶体液量[1 000(525~1 100) mL vs 1 100(1 000~1 350) mL]、术中入胶体液量[500(500~500) mL vs 500(500~1 000) mL]、胃管拔出时间[0 d vs 1(1~1) d]、恢复普食时间[1(1~2) d vs 2(1~3) d]差异有统计学意义(P <0. 05)。在手术时间、术中出血量、引流管拔出时间、术后住院时间、腹腔镜术式构成比例等方面均差异无统计学意义(P> 0. 05)。ERAS方案组和CRAS方案组分别有3例(10. 3%)和5例(15. 2%) Clavien-Dindo 1级合并症,差异不具有统计学意义(P=0. 573)。两组均无患者术后再入院。结论 ERAS方案对比CRAS方案可以在不增加合并症的基础上缩短患者恢复普通饮食时间,推进患者术后康复,在腹腔镜泌尿外科上尿路手术中的应用是安全和可行的,但还需要大样本量随机对照研究进行全面评估。
