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Habitat values for artificial oyster (Crassostrea ariakensis) reefs compared with natural shallow-water habitats in Changjiang River estuary 总被引:1,自引:0,他引:1
studies have compared oyster reefs with adjacent natural shallow-water habitats.Here the resident benthic macroinvertebrate communities in an artificial oyster(Crassostrea ariakensis) reef and in adjacent natural estuarine shallow-water habitats(salt marsh,intertidal mudflat,and subtidal soft bottom) in the Changjiang(Yangtze) River estuary were described.The mean total densities and biomass,Margalef’s species richness,Pielou’s evenness and Shannon-Weaver biodiversity indices of the resident benthic macroinvertebrate communities differed significantly among the habitats.Significantly higher densities and biomass of benthic macroinvertebrates occurred in the oyster reef compared with the other three habitats.Ordination plots showed a clear separation in benthic macroinvertebrate communities among the four habitat types.The results demonstrated that the artificial oyster reef supported distinct and unique benthic communities,playing an important role in the complex estuarine habitat by supplying prey resources and contributing to biodiversity.In addition,the results suggested that the oyster reef had been restored successfully. 相似文献
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崇明东滩潮沟浮游动物数量分布与变动 总被引:3,自引:0,他引:3
根据2008年4-12月对上海市崇明岛东滩潮沟进行4个季节的浮游动物调查资料,研究了崇明东滩潮沟浮游动物的数量分布及变动。结果表明,调查区浮游动物总丰度较高,四季变化明显。受潮汐作用的影响,夏、秋、冬三季落潮时丰度大于涨潮时,春季涨潮时丰度则大于落潮时。浮游动物在6条潮沟的平面分布不均匀,春季东旺沙边滩区和北八边滩区的数量明显多于近团结沙边滩区,夏、秋季分别以东旺沙边滩区和北八滧边滩区的数量最多,冬季则以近团结沙边滩区的数量最多。主要优势种细巧华哲水蚤(Sinocalanus tenellus)、中华华哲水蚤(Sinocalanus sinensis)、火腿许水蚤(Schmackeria poplesia)、四刺窄腹剑水蚤(Limnoithona etraspina)和四刺破足猛水蚤(Mesochra quadrispinosa)等数量的季节、潮汐变化及各时期的空间分布格局差异明显,其数量分布情况决定了浮游动物总数量的分布。盐度是影响冬、春季涨潮时浮游动物总丰度分布的主要因子,水温则是影响夏、秋季涨潮时总丰度分布的主要因子。此外,径流及潮流等动力因素对潮沟浮游动物数量的时空分布也产生重要影响。 相似文献
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江苏小庙洪牡蛎礁大型底栖动物多样性及群落结构 总被引:1,自引:1,他引:0
基于2011年春季的生态调查资料,报道了江苏小庙洪自然潮间带牡蛎礁大型底栖动物的多样性及其群落结构。通过16SrDNA基因序列分析发现,在小庙洪牡蛎礁内分布有3种牡蛎(熊本牡蛎Crassostrea sikamea、近江牡蛎C.ariakensis和密鳞牡蛎Ostrea denselamellosa),其中分布于潮间带区的造礁活体牡蛎为熊本牡蛎,其平均密度和生物量分别为(2199±363)ind/m2和(12361±1645)g/m2。在该牡蛎礁内记录到定居性大型底栖动物(不包括3种牡蛎)共计43科66种,礁体大型底栖动物的总栖息密度和生物量分别达到(2830±182)ind/m2和(499.59±35.41)g/m2,显著高于邻近的软相潮间带泥(沙)质滩涂[密度(102±29)ind/m2;生物量(53.10±22.80)g/m2]和潮下带泥滩[密度(140±60)ind/m2;生物量(43.23±22.37)g/m2](P<0.001)。 相似文献
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