{"title":"根据密西西比河上游的长期监测数据估计的每年夏季淹没的大型植物存量。","authors":"D. Drake, E. Lund, R. M. Kreiling","doi":"10.3996/jfwm-21-063","DOIUrl":null,"url":null,"abstract":"System-scale restoration efforts within the Upper Mississippi River National Wildlife and Fish Refuge have included annual monitoring of submersed aquatic vegetation (SAV) since 1998 in four representative reaches spanning ~440 river km. We developed predictive models relating monitoring data (site-scale SAV abundance indices) to diver-harvested SAV biomass, used the models to back-estimate annual standing stock biomass between 1998 and 2018 and compared biomass estimates to previous abundance measures. Two morphologically distinct groups of SAV with differing sampling efficiencies were modeled and estimated separately: the first category included only wild celery Vallisneria americana, which has long, unbranched leaves and dominates lotic environments, while the second category included 17 branched morphology species (e.g., hornwort Ceratophyllum demersum and Canadian water weed Elodea canadensis) and dominates lentic environments. Wild celery accounted for approximately half of total estimated total biomass in the four reaches, combined branched species accounted for half, and invasive species (Eurasian watermilfoil Myriophyllum spicatum and curly-leaf pondweed Potamogeton crispus), a fraction of the branched species, accounted for <1.5%. Site-scale SAV estimates ranged from 0 to 535 g m-2 (dry mass). Increases in biomass were observed in most areas between 1998 and 2009 and substantial increases (e.g., from <10 g m-2 to ~125 g m-2) in wild celery observed in extensive impounded areas between 2002 and 2007. Analyses also indicate a transitional period in 2007-2010 during which changes in biomass trajectories were evident in all reaches, and included the start of a nine-year, ~70% decrease in wild celery biomass in the southernmost impounded area. Biomass estimates provided new insights and illustrated scales of change that were not previously apparent using traditional metrics. The ability to estimate biomass from LTRM monitoring data improves conservation efforts through better understanding of changes in habitat and food resources for biota, improved goal setting for restoration projects and improved quantification of SAV-mediated structural effects such as anchoring of sediments and feedbacks with water quality.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":" ","pages":""},"PeriodicalIF":0.9000,"publicationDate":"2022-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Annual summer submersed macrophyte standing stocks estimated from long-term monitoring data in the Upper Mississippi River.\",\"authors\":\"D. Drake, E. Lund, R. M. 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Two morphologically distinct groups of SAV with differing sampling efficiencies were modeled and estimated separately: the first category included only wild celery Vallisneria americana, which has long, unbranched leaves and dominates lotic environments, while the second category included 17 branched morphology species (e.g., hornwort Ceratophyllum demersum and Canadian water weed Elodea canadensis) and dominates lentic environments. Wild celery accounted for approximately half of total estimated total biomass in the four reaches, combined branched species accounted for half, and invasive species (Eurasian watermilfoil Myriophyllum spicatum and curly-leaf pondweed Potamogeton crispus), a fraction of the branched species, accounted for <1.5%. Site-scale SAV estimates ranged from 0 to 535 g m-2 (dry mass). Increases in biomass were observed in most areas between 1998 and 2009 and substantial increases (e.g., from <10 g m-2 to ~125 g m-2) in wild celery observed in extensive impounded areas between 2002 and 2007. Analyses also indicate a transitional period in 2007-2010 during which changes in biomass trajectories were evident in all reaches, and included the start of a nine-year, ~70% decrease in wild celery biomass in the southernmost impounded area. Biomass estimates provided new insights and illustrated scales of change that were not previously apparent using traditional metrics. 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引用次数: 2
摘要
自1998年以来,密西西比河上游国家野生动物和鱼类保护区内的系统规模恢复工作包括对跨越约440河公里的四个代表性河段的淹没水生植被(SAV)进行年度监测。我们开发了将监测数据(现场规模的SAV丰度指数)与潜水员收获的SAV生物量相关的预测模型,使用这些模型对1998年至2018年间的年度常备种群生物量进行了反向估计,并将生物量估计值与以前的丰度测量值进行了比较。分别对具有不同采样效率的两组形态上不同的SAV进行了建模和估计:第一类仅包括野生芹菜美洲苦草,它有长而不分枝的叶子,在乳液环境中占主导地位,而第二类包括17个分支形态物种(如角藻金鱼藻和加拿大水草Elodea canadensis),并在慢生环境中占主导地位。野生芹菜约占四个河段估计总生物量的一半,混合分支物种占一半,入侵物种(欧亚水杨和卷叶pondweed Potamogeton crispus)(分支物种的一部分)占<1.5%。现场规模的SAV估计值在0-535 g m-2(干质量)之间。1998年至2009年间,大多数地区的生物量都有所增加,2002年至2007年间,在大面积蓄水的地区,野生芹菜的数量也大幅增加(例如,从<10克m-2增加到~125克m-2)。分析还表明,2007-2010年是一个过渡期,在此期间,所有河段的生物量轨迹都发生了明显变化,其中包括最南端蓄水区的野生芹菜生物量开始了九年约70%的下降。生物量估计提供了新的见解,并说明了以前使用传统指标时不明显的变化规模。通过LTRM监测数据估计生物量的能力,通过更好地了解生物群栖息地和食物资源的变化,改进恢复项目的目标设定,以及改进SAV介导的结构效应的量化,如沉积物的锚定和水质反馈,改进了保护工作。
Annual summer submersed macrophyte standing stocks estimated from long-term monitoring data in the Upper Mississippi River.
System-scale restoration efforts within the Upper Mississippi River National Wildlife and Fish Refuge have included annual monitoring of submersed aquatic vegetation (SAV) since 1998 in four representative reaches spanning ~440 river km. We developed predictive models relating monitoring data (site-scale SAV abundance indices) to diver-harvested SAV biomass, used the models to back-estimate annual standing stock biomass between 1998 and 2018 and compared biomass estimates to previous abundance measures. Two morphologically distinct groups of SAV with differing sampling efficiencies were modeled and estimated separately: the first category included only wild celery Vallisneria americana, which has long, unbranched leaves and dominates lotic environments, while the second category included 17 branched morphology species (e.g., hornwort Ceratophyllum demersum and Canadian water weed Elodea canadensis) and dominates lentic environments. Wild celery accounted for approximately half of total estimated total biomass in the four reaches, combined branched species accounted for half, and invasive species (Eurasian watermilfoil Myriophyllum spicatum and curly-leaf pondweed Potamogeton crispus), a fraction of the branched species, accounted for <1.5%. Site-scale SAV estimates ranged from 0 to 535 g m-2 (dry mass). Increases in biomass were observed in most areas between 1998 and 2009 and substantial increases (e.g., from <10 g m-2 to ~125 g m-2) in wild celery observed in extensive impounded areas between 2002 and 2007. Analyses also indicate a transitional period in 2007-2010 during which changes in biomass trajectories were evident in all reaches, and included the start of a nine-year, ~70% decrease in wild celery biomass in the southernmost impounded area. Biomass estimates provided new insights and illustrated scales of change that were not previously apparent using traditional metrics. The ability to estimate biomass from LTRM monitoring data improves conservation efforts through better understanding of changes in habitat and food resources for biota, improved goal setting for restoration projects and improved quantification of SAV-mediated structural effects such as anchoring of sediments and feedbacks with water quality.
期刊介绍:
Journal of Fish and Wildlife Management encourages submission of original, high quality, English-language scientific papers on the practical application and integration of science to conservation and management of native North American fish, wildlife, plants and their habitats in the following categories: Articles, Notes, Surveys and Issues and Perspectives. Papers that do not relate directly to native North American fish, wildlife plants or their habitats may be considered if they highlight species that are closely related to, or conservation issues that are germane to, those in North America.