Culture and morphology of some New Zealand barnacles (Crustacea: Cirripedia)     

M. F. Barker 《新西兰海洋与淡水研究杂志》2013,47(1):139-158

The larval stages of the acorn barnacles Chamaesipho columna, Chamaesipho brunnea, Elminius plicatus, Elminius modestus, Balanus trigonus, and Tetraclita purpurascens are described from larvae reared in the laboratory. A key and a table are included for separating larval stages and species.

Skeletonema costatum appears to have a wide application as a food in the rearing of larvae of the Balanidae.

The two Chamaesipho species show typical chthamalid characters of hispid antennal setae and unilobed labrum. The similarity between the larvae of Elminius plicatus and Tetraclita purpurascens supports the classification of E. plicatus as a tetraclitid.  相似文献   

Upper tertiary rocks from the continental shelf and slope off Southern Hawkes Bay     

K. B. Lewis 《新西兰海洋与淡水研究杂志》2013,47(4):663-670

Sixteen rock samples were collected from the continental shelf and slope between Napier and Cape Turnagain, southern Hawkes Bay, most coming from offshore anticlinal ridges. Nine of the samples have a foraminiferal fauna of Upper Miocene and Pliocene age. The remainder cannot be dated, but most are probably of similar age. The foraminiferal. faunas are considered to have lived at depths ranging down to at least 1600 m deeper than the depth from which they were collected. Thus, the post‐depositional history of the samples includes tectonic uplift of similar magnitude since Upper Tertiary times. Because most of the samples arc very fine grained, unlike Recent sediments from ridges, it is suggested that the present regime of folding is largely post‐Pliocene in age.  相似文献   

海南三亚风景区潮间带软体动物的资源现状研究     

佟文天  李捷  王海艳  张涛  张素萍  徐凤山 《海洋科学》2013,37(8):11-15

于2012年5月和2012年10月对海南三亚几个典型海区潮间带软体动物进行了初步调查,分别于天涯海角、鹿回头、小东海、大东海进行采样,共采集标本1702号,经鉴定组成如下：多板纲1科1种,占1.47%;腹足纲18科46种,占67.65%;双壳纲8科21种,占30.88%。共计27科68种。与其他地点的潮间带软体动物资源相比,本处软体动物偏少,并提出了相关保护建议。  相似文献   

A new species of Eunice (Polychaeta: Eunicidae) from Hainan Island, South China Sea     

吴旭文  孙瑞平  刘瑞玉 《中国海洋湖沼学报》2013,31(1):134-139

Ataxonomic survey of benthic marine animals from coastal regions of Hainan Island, South China Sea, revealed specimens of a new species of Eunice (Polychaeta: Eunicida: Eunicidae), Eunice uschakovi n. sp., collected from the intertidal zone. The species belongs to the group of Eunice that has yellow tridentate subacicular hooks and branchiae scattered over an extensive region of the body. It resembles E. miurai and E. havaica in having both bidentate and tridentate falcigers, but can be readily distinguished by branchial features. Comparisons between E. uschakovi and the two related species are presented.  相似文献   

Analysis of multi-dimensional SAR for determining the thickness of thin sea ice in the Bohai Sea   总被引：1，自引：0，他引：1  

张晰  张杰  孟俊敏  苏腾飞 《中国海洋湖沼学报》2013,31(3):681-698

Flat thin ice (<30 cm thick) is a common ice type in the Bohai Sea, China. Ice thickness detection is important to offshore exploration and marine transport in winter. Synthetic aperture radar (SAR) can be used to acquire sea ice data in all weather conditions, and it is a useful tool for monitoring sea ice conditions. In this paper, we combine a multi-layered sea ice electromagnetic (EM) scattering model with a sea ice thermodynamic model to assess the determination of the thickness of flat thin ice in the Bohai Sea using SAR at different frequencies, polarization, and incidence angles. Our modeling studies suggest that co-polarization backscattering coefficients and the co-polarized ratio can be used to retrieve the thickness of flat thin ice from C- and X-band SAR, while the co-polarized correlation coefficient can be used to retrieve flat thin ice thickness from L-, C-, and X-band SAR. Importantly, small or moderate incidence angles should be chosen to avoid the effect of speckle noise.  相似文献   

Rock warming and drying under simulated intertidal conditions,part II: weathering and biological influences on evaporative cooling and near‐surface micro‐climatic conditions as an example of biogeomorphic ecosystem engineering     

Martin A. Coombes  L. A. Naylor 《地球表面变化过程与地形》2012,37(1):100-118

The way in which rocks and engineering materials heat‐up and dry‐out in the intertidal zone is of relevance to both weathering and ecology. These behaviours can be measured in the laboratory under controlled conditions designed to replicate those occurring in the field. Previous studies have demonstrated differences in thermal behaviours between rock types and through time as a result of soiling in terrestrial environments, but the influence of weathering and colonization on rock behaviours in the intertidal zone has not been previously assessed. We measured the warming and drying of blocks of rock (limestone and granite) and marine concrete during ‘low‐tide’ events simulated in the laboratory, before and after a period of exposure (eight months) on rock platforms in Cornwall, UK. As well as differences between the material types, temperatures of control (unexposed) and field‐exposed blocks differed in the order of 1 to 2 °C. Drying behaviours were also different after field exposure. Differences during the first few hours of exposure to air and heat were attributed to discolouration and albedo effects. Over longer periods of time, changes in the availability of near‐surface pore water as a result of micro‐scale bioerosion of limestone and the development of bio‐chemical crusts on marine concrete [observed using scanning electron microscopy (SEM)] are suggested as mechanisms enhancing and reducing, respectively, the efficiency of evaporative cooling. The retention of moisture by epilithic biofilms may also influence thermal and drying behaviours of granite. These observations represent one of the first examples of cross‐scalar biogeomorphic linkages in the intertidal zone. The significance of the results for the subsequent efficiency of weathering, and near‐surface micro‐climatic conditions experienced by colonizing organisms is discussed. The involvement of microorganisms in the creation of more (or less) ecologically stressful conditions through the alteration of substratum geomorphic properties and behaviours is suggested as an example of ‘biogeomorphic ecosystem engineering’. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

汶川地震不同场地反应谱平台值统计分析     

郭晓云  薄景山  巴文辉 《地震工程与工程振动》2012,32(4):54-62

加速度反应谱平台值表征地震动的强度特性,场地条件是影响反应谱平台值的一个重要因素.本文选取6组同一地区断层距相近而场地条件不同的强震记录,对其标准化的加速度反应谱形状及平台值进行分析;并以汶川地震中173个有详细地勘场地上的强震记录为基础,统计分析了不同场地类别和断层距区间内的加速度反应谱平台值.本文研究结果显示,场地条件对加速度反应谱平台值有较大影响,随着场地变软,加速度反应谱平台值增大.本文定义了场地影响系数,计算并给出了不同地面峰值加速度对应的场地影响系数.  相似文献   

淤泥质潮滩剖面冲淤演变数值模拟分析——以河北省沧州市为例     

韩晓庆  褚玉娟  李晶  朱伟龙  赵宇  高伟明 《海洋学报》2012,34(5):111-115

为全面剖析淤泥质潮滩变化规律及演变特征,运用修改后的输沙公式建立了淤泥质潮滩演变数值模型。经2000,2007年野外实测数据验证,表明该模型各参数设置准确,较真实地反演了滩涂剖面变化过程,可用于淤泥质潮滩的模拟计算。根据数值模型计算结果得出如下结论:1987-2010年河北省沧州市淤泥质潮滩坡度不断增大,但增长速率变化不大,为0.002×10-3。0 m等深线上部坡度逐渐变缓,年均降低0.021×10-3;下部坡度不断变陡,年均增长0.022×10-3。研究区潮滩未达平衡状态,其坡度将进一步变陡。该输沙模型及研究结论对淤泥质潮滩的保护具有重要的理论指导意义,为其科学开发管理提供实际参考依据。  相似文献   

Evidence of the restricted gene flow within a small spatial scale in the Japanese common intertidal goby Chaenogobius annularis     

Shotaro Hirase  Manami Kanno  Minoru Ikeda  Akihiro Kijima 《Marine Ecology》2012,33(4):481-489

Elucidating the scale of gene flow among populations is an important challenge for understanding the ecological dynamics and local adaptation of marine organisms. We assessed whether gene flow is restricted even at a small spatial scale in the Japanese common intertidal goby Chaenogobius annularis, using highly polymorphic DNA markers, involving the mitochondrial DNA (mtDNA) control region and 15 microsatellite DNA (msDNA), because past ecological studies have suggested low dispersal ability for rocky intertidal fishes. We found significant heterogeneities between four neighboring local populations by both mtDNA and msDNA analyses. In addition, no genetic heterogeneity was detected by either method across generations within a population; it was considered that such genetic differentiation is retained across generations and that the gene flow of this species is restricted to within a radius of a few kilometers. This is the first report showing a clear genetic subdivision in rocky intertidal fish.  相似文献   

Enoplus taipingensis, a new species of marine nematode from the rocky intertidal seaweeds in the Taiping Bay, Qingdao     

ZHANG Zhinan  ZHOU Hong 《海洋学报(英文版)》2012,31(2):102-108

One new species of free-living marine nematodes Enoplus taipingensis sp.nov.from the rocky intertidal seaweeds in the Taiping Bay,Qingdao is described and illustrated with scanning electron microscopy observation and 18S rRNA gene sequence analysis.Enoplus taipingensis is characterized by special arrangement of lateral setae on the tail,three cervical setae,distal structure on the supplement,and much longer body length with bigger De Man ratio "a".Type specimens are deposited in the College of Marine Life Science,Ocean University of China.  相似文献