Investigating the effects of dreissenid mussel shells in streams post-invasion

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Darrin S. Hunt, Donna R. Kashian
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Abstract

The ecological impact of dreissenid mussel (e.g., quagga and zebra) populations and their empty shells on native fauna in large rivers and lakes has been extensively studied. However, there is limited information on their effects in small wadable streams. Although established mussel populations in these systems are uncommon, their shells are found in high densities in benthic environments and may adversely impact stream communities. Shell densities were quantified using quadrats in two wadable streams to assess impacts on native benthic macroinvertebrates and fish. Eight reaches of each river were sampled, four with dreissenids and four without, totaling 16 locations. Macroinvertebrate and fish communities were characterized using diversity and environmental tolerance indices. Shell densities were significantly higher in dreissenid-invaded sites compared to sites with only native bivalves in both rivers. Dense shell beds had degraded biological conditions with fewer sensitive macroinvertebrates, but bed density did not affect overall macroinvertebrate or fish diversity. These findings differ from lake and large river studies, which found a greater impact of dreissenid shell deposition on macroinvertebrate and fish diversity than we observed in small wadable streams. Thus, a different approach to management and restoration may be necessary to maintain a natural community composition in wadable streams.

Abstract Image

调查入侵后溪流中天红贻贝贝壳的影响
人们已经广泛研究了大型河流和湖泊中的裸裂颚贻贝(如嘎嘎贻贝和斑马贻贝)种群及其空壳对本地动物的生态影响。然而,关于它们对可涉水小溪流的影响的资料却很有限。虽然在这些水系中已形成的贻贝种群并不常见,但它们的贝壳在底栖环境中的密度很高,可能会对溪流群落产生不利影响。为了评估贻贝对本地底栖大型无脊椎动物和鱼类的影响,我们在两条可涉水溪流中使用四分法对贻贝密度进行了量化。对每条河流的 8 个河段进行了取样,其中 4 个河段有泥沙,4 个河段没有,共 16 个取样点。利用多样性和环境耐受性指数对大型无脊椎动物和鱼类群落进行了特征描述。在这两条河流中,与仅有本地双壳类动物的地点相比,受狄森虫侵袭地点的贝类密度明显更高。密集的贝床导致生物条件恶化,敏感的大型无脊椎动物减少,但贝床密度并不影响大型无脊椎动物或鱼类的整体多样性。这些研究结果与湖泊和大河的研究结果不同,湖泊和大河的研究发现,与我们在可涉水的小溪流中观察到的结果相比,沉积在湖泊和大河中的棘皮动物贝壳对大型无脊椎动物和鱼类多样性的影响更大。因此,可能需要采取不同的管理和恢复方法,以保持可涉水溪流的自然群落组成。
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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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