Background:Fiber length is one of the primary quality parameters for the cotton industry when considering the textile performance and end-use quality of cotton.Currently,many decisions regarding cotton fiber length ut...Background:Fiber length is one of the primary quality parameters for the cotton industry when considering the textile performance and end-use quality of cotton.Currently,many decisions regarding cotton fiber length utilize the industry standard measurement device,i.e.,the High Volume Instrument(HVI).However,it is documented that complete fiber length distributions hold more information than the currently reported HVI length parameters,i.e.,upper half mean length(UHML)and uniformity index(UI).An alternative measurement device,the Advanced Fiber Information System(AFIS),is able to capture additional information about fiber length distribution.What is currently not known is how much additional information the AFIS length distribution holds.Results:The stability of differences in within-sample variation in fiber length captured by the AFIS length distribution by number characterizing differences between samples was deemed stable across the extended testing period.A diverse breeding population was evaluated and four significant sources of within sample variation in length were identified.A comparison of the ability between HVI length parameters and AFIS fiber length distribution to correctly categorize breeding lines to their family was performed.In all cases,the AFIS fiber length distribution more accurately identified germplasm families.Conclusions:The long-term stability test of the AFIS fiber length distribution by number shows that the measurement is stable and can be used to assess differences across samples.However,more information about within-sample variation in fiber length than that can be captured by length parameters is needed to assess differences across samples in many applications.Four length parameters outperform two length parameters when trying to identify the familial background of the samples in this set.These parameters characterize distributional shape differences that are not captured by the standard AFIS length parameters,UQL and short fiber content by number(SFCn).These findings suggest that additional types of variation in cotton fiber length are not captured and are therefore not currently used in most cotton breeding programs.展开更多
布兰斯菲尔德海峡为南极磷虾主要捕捞区域,为了进一步研究该海域南极磷虾资源分布及生物学特征,基于2018/19渔季中国南极磷虾商业捕捞数据,从时间和空间两个维度对南极磷虾CPUE(catch per unit fishing effort,CPUE)、体长及年龄组成进...布兰斯菲尔德海峡为南极磷虾主要捕捞区域,为了进一步研究该海域南极磷虾资源分布及生物学特征,基于2018/19渔季中国南极磷虾商业捕捞数据,从时间和空间两个维度对南极磷虾CPUE(catch per unit fishing effort,CPUE)、体长及年龄组成进行了分析。结果表明,布兰斯菲尔德海峡南极磷虾CPUE月间差异显著(P<0.001),4—7月平均CPUE整体呈下降趋势;CPUE沿海峡呈东北-西南向分布,高值区多分布在海峡东北海域(58°45′00"~59°45′00"W、62°52′30"~63°07′30"S)。空间冷热点分析结果表明,CPUE热点主要位于海峡东北海域,核心冷点和次冷点主要分布在海峡西南海域和东南海域。不同月间南极磷虾体长差异显著(P<0.001),平均体长变化范围为39.72~44.51 mm;平均体长低值区沿东北-西南走向平行分布于海峡西缘的南设得兰群岛近岸海域,高值区多分布在海峡中部及海峡东缘的南极半岛近岸海域。不同月间南极磷虾年龄组成差异较大,5月年龄组成以3~+龄为主,其余月份以2~+龄为主;年龄组成整体上由西北向东南增大,海峡西缘的南设得兰群岛近岸海域年龄组成略低于海峡中部及海峡东缘的南极半岛近岸海域。展开更多
基金Funds for this research were provided by Cotton Incorporated and the Cotton Incorporated Fellowship Program project number 17–539。
文摘Background:Fiber length is one of the primary quality parameters for the cotton industry when considering the textile performance and end-use quality of cotton.Currently,many decisions regarding cotton fiber length utilize the industry standard measurement device,i.e.,the High Volume Instrument(HVI).However,it is documented that complete fiber length distributions hold more information than the currently reported HVI length parameters,i.e.,upper half mean length(UHML)and uniformity index(UI).An alternative measurement device,the Advanced Fiber Information System(AFIS),is able to capture additional information about fiber length distribution.What is currently not known is how much additional information the AFIS length distribution holds.Results:The stability of differences in within-sample variation in fiber length captured by the AFIS length distribution by number characterizing differences between samples was deemed stable across the extended testing period.A diverse breeding population was evaluated and four significant sources of within sample variation in length were identified.A comparison of the ability between HVI length parameters and AFIS fiber length distribution to correctly categorize breeding lines to their family was performed.In all cases,the AFIS fiber length distribution more accurately identified germplasm families.Conclusions:The long-term stability test of the AFIS fiber length distribution by number shows that the measurement is stable and can be used to assess differences across samples.However,more information about within-sample variation in fiber length than that can be captured by length parameters is needed to assess differences across samples in many applications.Four length parameters outperform two length parameters when trying to identify the familial background of the samples in this set.These parameters characterize distributional shape differences that are not captured by the standard AFIS length parameters,UQL and short fiber content by number(SFCn).These findings suggest that additional types of variation in cotton fiber length are not captured and are therefore not currently used in most cotton breeding programs.
文摘布兰斯菲尔德海峡为南极磷虾主要捕捞区域,为了进一步研究该海域南极磷虾资源分布及生物学特征,基于2018/19渔季中国南极磷虾商业捕捞数据,从时间和空间两个维度对南极磷虾CPUE(catch per unit fishing effort,CPUE)、体长及年龄组成进行了分析。结果表明,布兰斯菲尔德海峡南极磷虾CPUE月间差异显著(P<0.001),4—7月平均CPUE整体呈下降趋势;CPUE沿海峡呈东北-西南向分布,高值区多分布在海峡东北海域(58°45′00"~59°45′00"W、62°52′30"~63°07′30"S)。空间冷热点分析结果表明,CPUE热点主要位于海峡东北海域,核心冷点和次冷点主要分布在海峡西南海域和东南海域。不同月间南极磷虾体长差异显著(P<0.001),平均体长变化范围为39.72~44.51 mm;平均体长低值区沿东北-西南走向平行分布于海峡西缘的南设得兰群岛近岸海域,高值区多分布在海峡中部及海峡东缘的南极半岛近岸海域。不同月间南极磷虾年龄组成差异较大,5月年龄组成以3~+龄为主,其余月份以2~+龄为主;年龄组成整体上由西北向东南增大,海峡西缘的南设得兰群岛近岸海域年龄组成略低于海峡中部及海峡东缘的南极半岛近岸海域。
