Community turnover provides insight into variable invertebrate recovery between restored streams with different integrated catchment management plans     

Sharon Elizabeth Graham  John Martin Quinn 《新西兰海洋与淡水研究杂志》2020,54(3):467-489

ABSTRACT

Understanding temporal patterns in restored environments is important for identifying potential barriers to recovery and improved management of degraded habitats. In this paper, we use temporal beta diversity analyses to compare invertebrate community recovery trajectories in three restored agricultural stream sites under different integrated catchment plans, a native forest reference site, and two unmodified pasture control stream sites over 24 years. The restored sites diverged from their initial community composition over time and became more similar to the reference site community, which was relatively stable over time. Variation partitioning showed that prior to restoration beta diversity was primarily associated with environmental and spatial drivers, whereas post-restoration beta diversity was more influenced by temporal and environmental drivers, including changes in substrate size, fine sediments, water clarity, and nutrients, as well as temperature and flow regime. Species’ contributions to beta diversity varied between sites and years, with sensitive EPT taxa contributing more in reference and control sites. However, contributions of some EPT species, particularly mayflies, increased in restored sites post-ICM. In summary, after nearly two decades of ICM, restored stream sites show recovery towards reference conditions, yet differences persist, indicating that rehabilitation may take longer, depending on the restoration goals.  相似文献   

Temporal patterns in the structure of macrobenthic communities of an Australian estuary     

Sebastian Rainer 《Estuarine, Coastal and Shelf Science》1981,13(6):597-620

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The role of interannual environmental variations in the geographic range of spawning and feeding concentrations of redfish Sebastes mentella in the Irminger Sea     

Pedchenko  Andrey P. 《ICES Journal of Marine Science》2005,62(7):1501-1510

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Temporal change of clustered distribution of planktonic ciliates in Toyama Bay in summers of 1989 and 1990     

Toshikazu Suzuki  Akira Taniguchi 《Journal of Oceanography》1997,53(1):35-40

Temporal change of clustered distribution in vertical profiles of three nutritional groups of planktonic ciliates, e.g. heterotrophic naked ciliates, mixotrophic naked ciliates and heterotrophic loricated ciliates, was investigated by following a drifting buoy in Toyama Bay on the Japan Sea coast of central Japan in summers of 1989 and 1990. Clustered distribution, represented as the mode of population density in the vertical plane, occurred mainly in the oligotrophic upper layer (0–50 m depth) above the subsurface chlorophyll-a maximum layer. Its clustered degree was stronger when the mode of population density in the vertical plane was formed at shallower depth, while its longevity was shorter as mentioned above. Vertical distribution of ciliates during summer in Toyama Bay is characterized by ephemeral clustered distribution, or in other wards, by rapid alternations of appearance and disappearance of the clustered distribution.  相似文献   

杭州湾海域水体悬沙粒度统计分析     

茹荣忠 《海洋学研究》2002,20(4):13-18

利用2000年9月在杭州湾进行的原型水文泥沙测验所获取的648个悬沙粒度样品,进行了样品粒度统计分析,结果表明:在杭州湾测验区域,粒径为4.00～20.20μm的悬沙出现频率最高;悬沙的中值粒径值自东向西迅速增大;北岸海域悬沙的中值粒径值大于南岸海域悬沙的中值粒径值。  相似文献   

Evidence of temporal genetic change in wild Atlantic salmon, Salmo salar L., populations affected by farm escapees     

Skaala  Oystein; Wennevik  Vidar; Glover  Kevin A. 《ICES Journal of Marine Science》2006,63(7):1224-1233

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渤海的潮波系统及其变迁   总被引：3，自引：0，他引：3  

黄祖珂 《中国海洋大学学报(自然科学版)》1991,(2)

采用二维非线性潮波微分方程对渤海M_2、S_2、K_1、O_1四个分潮进行数值模拟,得出四个分潮的潮波图,椭圆长短轴图,同潮流时图以及潮汐、潮流性质图和S_2与M_2、K_1与O_1的迟角差图。依此可以系统地了解渤海潮波系统的分布变化规律。依据30～40年代测得的渤海海图以及假设数十年后渤海的岸形对渤海进行数值模拟,从而了解过去和现在渤海潮波的变化情况,以及对未来潮波的变化作出判断。计算表明,从30年代到70年代以来,渤海南部的半日分潮波发生了很大的变化,而日分潮的潮波变化较小。  相似文献   

台湾海峡微微型浮游植物的生态研究——Ⅰ.时空分布及其调控机制   总被引：10，自引：3，他引：10       下载免费PDF全文

黄邦钦  洪华生  林学举  陈纪新 《海洋学报》2003,25(4):72-82

1997年8月、1998年2～3月和1998年8月,调查分析了台湾海峡微微型浮游植物的时空分布(平面、垂直、总日和季节)及其调控机制。结果表明,微微型浮游植物丰度的平面分布不均匀,各类群具有不同的密集区,并存在明显的地理差异,垂直分布存在6种模式,以标准单峰和弱单峰为主,分布类型的多样化是由于微微型浮游植物固有的垂直分布模式和研究海域复杂的地形及水动力(如跃层等)条件相互作用的结果,微微型浮游植物的丰度存在明显的随时间变化现象;在季节变化方面,各类群存在较为明显的差异,温度是影响台湾海峡微微型浮游植物平面分布的重要因子,而光辐照度、温盐跃层是影响垂直分布的重要因子,微微型浮游植物不同类群在时空分布上存在“位移”现象,此与不同类群对温度敏感性不同、对光的利用能力不同以及生存空间的互补性等因素有关。  相似文献   

The effect of submarine groundwater discharge on nutrient and salinity regimes in a coastal lagoon off Perth, Western Australia     

R. E. Johannes  C. J. Hearn 《Estuarine, Coastal and Shelf Science》1985,21(6):789-800

Submarine groundwater discharge (SGD) into a coastal lagoon off Perth, Western Australia, contains nitrate and silicate in concentrations two orders of magnitude higher than those of the receiving waters. This discharge delivers enough nitrate to replace that dissolved in the lagoon water mass about every eight days and enough silicate to replace the lagoon silicate in about 48 days. The delivery rate of nitrate nitrogen by SGD is equal to about 48% of that required for observed growth rates of lagoon macrophytes. Surface salinity is lower close to the shore as a result of SGD. During calm conditions a salinity front was observed in the lagoon, with a nearshore pool of nutrient-enriched water floating above the more saline ocean water.  相似文献   

Temporal variation in an immune response gene (MHC I) in anadromous Salmo trutta in an Irish river before and during aquaculture activities     

Coughlan  James; McGinnity  Philip; O'Farrell  Brian; Dillane  Eileen; Diserud  Ola; de Eyto  Elvira; Farrell  Killian; Whelan  Ken; Stet  Rene J.M.; Cross  Thomas F. 《ICES Journal of Marine Science》2006,63(7):1248-1255

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