Flood pulse characteristics and physicochemical influences on harvested Procambarus clarkii and Procambarus zonangulus populations in the Atchafalaya River basin, Louisiana

IF 0.8 Q4 MARINE & FRESHWATER BIOLOGY Freshwater Crayfish Pub Date : 2019-02-28 DOI:10.5869/FC.2019.V24-1.23
Lauren Kong, Alex Ballinger, C. Bonvillain
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引用次数: 3

Abstract

The majority of Louisiana’s wild crayfish landings are harvested from the Atchafalaya River Basin (ARB) during floodplain inundation from the annual flood pulse. Spatial and temporal heterogeneity in ARB physicochemical characteristics are associated with flood pulse characteristics and floodplain inundation, and extensive areas of the ARB experience environmental hypoxia (dissolved oxygen [DO] < 2.0 mg·L-1) for several weeks to months during the annual flood pulse. The purpose of this research was to evaluate the effects of flood pulse characteristics and physicochemistry on harvested crayfish populations at 14 sites in the ARB that were sampled biweekly during the 2016 and 2017 crayfish seasons. Despite dissimilar 2016 and 2017 flood pulse characteristics, red swamp crawfish Procambarus clarkii and southern white river crawfish P. zonangulus carapace length and CPUE were similar between sample years. Comparisons of P. clarkii populations among physicochemical location groupings indicated that DO concentration, particularly chronically hypoxic water, is the principal abiotic variable influencing P. clarkii population characteristics. Although not significant, normoxic locations produced larger crayfish and yielded higher CPUE values for the majority of both crayfish seasons. Furthermore, hemolymph protein concentrations in P. clarkii from normoxic areas were significantly and consistently higher than individuals from chronically hypoxic locations.
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路易斯安那州Atchafalaya河流域洪水脉冲特征及其对收获的克氏原江豚和带状原江豚种群的物理化学影响
路易斯安那州的大多数野生小龙虾都是在每年的洪水脉冲淹没泛滥平原期间从阿特查法拉亚河流域(ARB)捕捞的。ARB物理化学特征的时空异质性与洪水脉冲特征和泛滥平原淹没有关,在年度洪水脉冲期间,ARB的大片地区经历了数周至数月的环境缺氧(溶解氧[DO]<2.0 mg·L-1)。本研究的目的是评估洪水脉冲特征和物理化学对ARB 14个地点收获的小龙虾种群的影响,这些地点在2016年和2017年小龙虾季节每两周取样一次。尽管2016年和2017年的洪水脉冲特征不同,但红沼泽小龙虾克氏原螯虾和南部白河小龙虾P.zonangulus甲壳长度和CPUE在样本年份之间相似。理化位置分组中克氏疟原虫种群的比较表明,DO浓度,特别是长期缺氧的水,是影响克氏疟原虫群体特征的主要非生物变量。尽管不显著,但在这两个小龙虾季节的大部分时间里,常氧地区产下了更大的小龙虾,并产生了更高的CPUE值。此外,来自常氧地区的克氏疟原虫血淋巴蛋白浓度显著且持续高于来自慢性缺氧地区的个体。
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Freshwater Crayfish
Freshwater Crayfish MARINE & FRESHWATER BIOLOGY-
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2.70
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