评估人类活动对 Babine 湖营养动态的影响:对红鲑产量的影响

IF 2.4 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Cécilia Barouillet , Kathleen R. Laird , Brian F. Cumming , Bruce P. Finney , Daniel T. Selbie
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引用次数: 0

摘要

不列颠哥伦比亚省的巴比内湖是加拿大最大的红鲑鱼(Oncorhynchus nerka)育苗湖,维持着众多生态系统服务(如渔业、娱乐、文化和精神利益)。自 20 世纪初以来,该湖及其流域经历了重大的人为和自然干扰,包括大面积伐木、松树甲虫灾害、采矿、渔业增产和气候变化。为了帮助了解当地和区域因素对这一大型淡水生态系统营养生态的累积影响,我们采用古气象学方法重建了过去 200 年间初级生产(亚化石色素、硅藻微化石)、次级生产(浮游动物微化石)和地球化学(碳和氮同位素、元素分析、有机物百分比)的变化。从约 1950 年到 2000 年期间,沉积物代用指标的变化与养分和溶解有机碳流入量的增加相一致,这可能是由于累积的景观干扰和降水量的增加造成的。这些变化包括 1950 年前后硅藻组成的变化,其丰度和类群的增加表明光的穿透力减弱和营养物质的富集。约 1975 年后,随着红鲑逃逸量的增加,δ15N(∼+1‰)和桡足类的浓度也随之增加。1975 年以后,随着红鲑逃逸量的增加,中上层鱼类产量也随之增加。藻类色素的最大、最突然的变化发生在约 2000 年之后,其特点是活动藻类和浮游藻类(即菊形藻、隐藻、群生蓝藻)的增加,此时区域气温升高,春秋季风力减弱,导致湖泊混合模式发生变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessment of anthropogenic impacts on the trophic dynamics of Babine Lake: Implications for the production of sockeye salmon
Babine Lake, British Columbia, is Canada’s largest sockeye salmon (Oncorhynchus nerka) nursery lake, sustaining numerous ecosystem services (e.g., fisheries, recreation, cultural and spiritual benefits). The lake and its watershed have experienced significant anthropogenic and natural disturbances since the early 1900’s, including extensive logging, pine beetle infestations, mining, fisheries enhancements, and climate change. To help understand the cumulative impacts of local and regional factors on the trophic ecology of this large freshwater ecosystem, we used the paleolimnological approach to reconstruct changes over the past ∼ 200 years of primary production (subfossil pigments, diatom microfossils), secondary production (cladoceran zooplankton microfossils) and geochemistry (carbon and nitrogen isotopes, elemental analyses, % organic matter). Between ca. 1950 and the 2000’s changes in the sedimentary proxies are consistent with an enhanced influx of nutrients and dissolved organic carbon likely due to the cumulative landscape disturbances and an increase in precipitation. These changes include shifts in diatom composition ca. 1950 to higher abundances and taxa indicative of decreased light penetration and nutrient enrichment. Increases in δ15N (∼ +1‰) and cladoceran concentrations, concurrent with increasing sockeye salmon escapement post ca. 1975, is indicative of a higher pelagic fish production that occurs concurrently with both fisheries enhancements and sustained higher precipitation. The largest and most abrupt change in algal pigments occurred post ca. 2000, characterized by increases in motile and buoyant algae (i.e., chrysophytes, cryptophytes, colonial cyanobacteria), a time of increasing regional air temperatures, reduced spring and autumn winds, and resultant changes in patterns of lake mixing.
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来源期刊
Journal of Great Lakes Research
Journal of Great Lakes Research 生物-海洋与淡水生物学
CiteScore
5.10
自引率
13.60%
发文量
178
审稿时长
6 months
期刊介绍: Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.
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