Multi-year monitoring shows higher species richness and diversity of fish assemblages in a Danish seagrass meadow as compared to neighbouring non-vegetated areas

IF 1.5 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY
Søren Lundgaard Olesen, Michael Hansen, Jens Peder Jeppesen, Michael Kühl, Kasper Elgetti Brodersen
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引用次数: 0

Abstract

Seagrass meadows provide an important nursery and feeding habitat for fish, globally. However, limited data exist on how these vegetated coastal ecosystems affect local fish stocks over longer time periods. By means of beach seine hauling with a bio-monitoring seine net, we collected fish data in Kronborg Bay (Denmark) over 4 years. The bay contains both vegetated and bare sediment areas in close proximity to Kronborg Castle in Elsinore and is part of the Øresund strait; a dynamic marine environment linking the Baltic Sea with the inner Danish waters (Kattegat). We investigated the biodiversity and fish abundance in a healthy seagrass meadow and compared it with a bare adjacent sediment area. We show that seagrass is important for fish species like the Atlantic cod, the two-spotted goby, and the broadnosed pipefish. The seagrass meadow harboured more fish species and higher biodiversity, while the number of individuals was higher in the adjacent bare sediment area as a result of high abundances of lesser sand eel. Pilou's evenness and the Shannon-Wiener index showed 2–4-fold higher biodiversity in the seagrass meadow. The seagrass meadow harboured about 35% more fish species than the bare adjacent sediment. The Atlantic cod was almost entirely found in the seagrass meadow, while lesser sand eel that showed an overall increase in abundance in both habitats, represented the largest proportion of the total number of fish individuals (up to about 60%) and was mostly found on the bare adjacent sediment. Species abundance was analysed for changes over time, where, for example the European plaice showed an increase in abundance over the 4-year period of investigation. Seagrass meadows can thus be very important for the Atlantic cod population in the Øresund strait and generally for local fish productivity, abundance and diversity.

Abstract Image

多年监测显示,与邻近的非植被区域相比,丹麦海草草甸的鱼类物种丰富度和多样性更高
海草草甸为全球鱼类提供了重要的育苗和觅食栖息地。然而,关于这些植被丰富的沿海生态系统如何在较长时期内影响当地鱼类种群的数据却很有限。通过使用生物监测围网进行海滩围捕,我们在丹麦克伦堡海湾收集了 4 年的鱼类数据。该海湾既有植被区,也有裸露沉积物区,靠近埃尔西诺尔的克伦堡城堡,是厄勒海峡的一部分;厄勒海峡是连接波罗的海和丹麦内海(卡特加特海峡)的动态海洋环境。我们调查了健康海草草甸的生物多样性和鱼类数量,并将其与邻近的裸露沉积物区域进行了比较。结果表明,海草对大西洋鳕鱼、双斑鰕虎鱼和宽吻琵琶鱼等鱼类非常重要。海草草甸栖息着更多的鱼类物种和更高的生物多样性,而在相邻的裸露沉积物区域,由于小沙鳗的数量较多,其个体数量也较高。皮鲁均匀度和香农-维纳指数显示,海草草甸的生物多样性要高出 2-4 倍。海草草甸中的鱼类种类比邻近裸露的沉积物多出约 35%。大西洋鳕鱼几乎全部栖息在海草草甸中,而小沙鳗在两种栖息地中的丰度总体上都有所增加,在鱼类个体总数中所占比例最大(高达约 60%),且主要栖息在邻近的裸露沉积物中。对物种丰度随时间的变化进行了分析,例如,欧洲鲽的丰度在 4 年的调查期内有所增加。因此,海草草甸对厄勒海峡的大西洋鳕鱼种群以及当地鱼类的生产力、丰度和多样性都非常重要。
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来源期刊
Marine Ecology-An Evolutionary Perspective
Marine Ecology-An Evolutionary Perspective 生物-海洋与淡水生物学
CiteScore
2.70
自引率
0.00%
发文量
37
审稿时长
>12 weeks
期刊介绍: Marine Ecology publishes original contributions on the structure and dynamics of marine benthic and pelagic ecosystems, communities and populations, and on the critical links between ecology and the evolution of marine organisms. The journal prioritizes contributions elucidating fundamental aspects of species interaction and adaptation to the environment through integration of information from various organizational levels (molecules to ecosystems) and different disciplines (molecular biology, genetics, biochemistry, physiology, marine biology, natural history, geography, oceanography, palaeontology and modelling) as viewed from an ecological perspective. The journal also focuses on population genetic processes, evolution of life histories, morphological traits and behaviour, historical ecology and biogeography, macro-ecology and seascape ecology, palaeo-ecological reconstruction, and ecological changes due to introduction of new biota, human pressure or environmental change. Most applied marine science, including fisheries biology, aquaculture, natural-products chemistry, toxicology, and local pollution studies lie outside the scope of the journal. Papers should address ecological questions that would be of interest to a worldwide readership of ecologists; papers of mostly local interest, including descriptions of flora and fauna, taxonomic descriptions, and range extensions will not be considered.
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