Department of Marine Sciences, University of Gothenburg, Carl Skottbergsgata 22B, 41319 Gothenburg, Sweden.
Department of Marine Sciences, University of Gothenburg, Carl Skottbergsgata 22B, 41319 Gothenburg, Sweden.
Mar Pollut Bull. 2017 Oct 15;123(1-2):227-231. doi: 10.1016/j.marpolbul.2017.08.056. Epub 2017 Sep 1.
Idefjord (Skagerrak, North Sea) has had a long pollution history due to a heavy exposure to effluents from sawmills and pulp and paper industry, which had a detrimental effect on fjord life. Earlier we presented a paper on the pollution history and benthic recovery in the fjord by studying sediment geochemistry (TOC and heavy metals) and benthic foraminifera in the sediment cores taken in the inner and the outer Idefjord. At that stage the foraminiferal (~benthic recovery) record was limited to years 2000 (inner fjord) and 2002 (outer fjord), in contrast to pollutant data reaching all the way up to 2014. In this short note we extend the foraminiferal record to year 2014 and fill the gap in the benthic recovery in the inner and the outer fjord over the last 12years. The results show that both inner and outer fjord inlets currently undergo a steady benthic recovery reflected in comeback of transitional and pre-pollution benthic foraminiferal species after 2000-2002 and towards 2014. The recovery is also supported by increasing faunal diversity, low dominance and since 2000-2002 re-appearance of calcareous foraminiferal species (Bulimina marginata, Elphidium spp., Epistominella vitrea, Hyalinea balthica and Lagena spp), which all disappeared during the period of maximum effluent discharges. At the same time, detection of opportunistic newcomers (e.g. Stainforthia fusiformis) and persisting absence of some transitional species such as Ammoscalaria tenuimargo suggests a recolonization by foraminiferal population with a different species composition as compared to the original pre-pollution community either due to changed environmental conditions or/and increased competition.
伊菲杰（斯卡格拉克，北海）由于受到锯木厂和纸浆造纸工业排放物的大量影响，长期受到污染，这对峡湾的生物造成了不利影响。早些时候，我们通过研究取自内伊菲杰和外伊菲杰的沉积物核心中的沉积物地球化学（TOC 和重金属）和底栖有孔虫，介绍了该峡湾的污染历史和底栖生物恢复情况。在当时，有孔虫（~底栖生物恢复）记录仅限于内伊菲杰（2000 年）和外伊菲杰（2002 年），而污染物数据则一直追溯到 2014 年。在这篇简短的说明中，我们将有孔虫记录延长至 2014 年，并填补了内伊菲杰和外伊菲杰过去 12 年来底栖生物恢复的空白。结果表明，目前内伊菲杰和外伊菲杰入口都在进行稳定的底栖生物恢复，这反映在 2000-2002 年之后以及 2014 年，过渡性和污染前底栖有孔虫物种的回归。这种恢复也得到了增加的动物群多样性、低优势度的支持，并且自 2000-2002 年以来，钙质有孔虫物种（边缘扁形虫、Elphidium spp.、Epistominella vitrea、Hyalinea balthica 和 Lagena spp.）再次出现，这些物种在最大污水排放期间都消失了。与此同时，机会主义新物种（例如 Stainforthia fusiformis）的出现以及一些过渡性物种（例如 Ammoscalaria tenuimargo）的持续缺失表明，与原始污染前群落相比，有孔虫种群的再殖民化具有不同的物种组成，这可能是由于环境条件的变化或/和竞争的增加。
