First boganiine beetle in mid-Cretaceous amber from northern Myanmar (Coleoptera: Boganiidae)     

Chenyang Cai  Diying Huang 《Proceedings of the Geologists' Association. Geologists' Association》2019,130(1):81-86

Cretoboganium gei gen. et sp. nov., a new amber inclusion of the cucujoid family Boganiidae is described and figured based on a well-preserved adult from the mid-Cretaceous Burmese amber (Hukawng Valley, northern Myanmar), some 99 million years ago. Based on the presence of a pair of pronotal callosities, Cretoboganium can be firmly placed in the extant subfamily Boganiinae, a small group currently comprising two small austral genera. Our discovery represents the first fossil record for Boganiinae. It also demonstrates another example that an apparently austral group may have its sister group occurred in today’s northern hemisphere. Together with the other fossil boganiid known from the Middle Jurassic of China, the finding suggests that Boganiidae is an ancient and relict group. Moreover, the present biogeographic distribution of Boganiinae is indicative of an earlier origin of this subfamily, which likely originated before the breakup of the Gondwanan supercontinent.  相似文献   

关岭生物群和卡尼期早期裂谷     

陈金华  罗辉  祝幼华  蔡华伟  许波  周志澄 《地层学杂志》2012,(1):65-70

讨论晚三叠世卡尼期早期关岭生物群的生存环境和死亡埋葬特点,认为该生物群分布于裂谷地区;生物群的群体死亡并被迅速埋葬的原因是地震;贵州龙生物群与关岭生物群是同期生物群;"S形带"是一构造断陷带,在卡尼期早期是裂谷。  相似文献   

Xinghaiornis lini (Aves: Ornithothoraces) from the Early Cretaceous of Liaoning: An Example of Evolutionary Mosaic in Early Birds     

WANG Xuri  Chiappe M. LUIS  TENG Fangfang  JI Qiang 《《地质学报》英文版》2013,87(3):686-689

We describe a new species of Early Cretaceous bird from the Yixian Formation of Liaoning Province. Xinghaiornis lini gen. et sp. nov. is relatively large and characterized by a long, toothless rostrum and an elevated pedal digit I. The design of the skull and feet suggests that this bird was likely a mud-prober. This discovery provides strong support indicating that this avian trophic specialization originated at least 125 million years ago.  相似文献   

Vagrant birds ashore at the Prince Edward Islands,southern Indian Ocean,from 1987 to 2009     

《African Journal of Marine Science》2013,35(3):445-450

Vagrant birds recorded ashore at Marion Island and Prince Edward Island from 1987 to 2009 are documented. In total, 101 observations (including multiple sightings of potentially the same individual) of 29 species were made. Palaearctic and Holarctic migrants (17 species), African species (n = 6) and pelagic species with a predominantly Southern Ocean distribution (n = 6) were observed. The number of observations peaked during the austral autumn, which corresponded to both the northward migration of Palaearctic species and maximum observer effort. Ruddy turnstones Arenaria interpres, barn swallows Hirundo rustica, common house-martins Delichon urbicum and cattle egrets Bubulcus ibis were most frequently observed; ruddy turnstones and common house-martins apparently increasing in occurrence over the past two decades.  相似文献   

Temporal variation of ophiuroids associated with the macroalga Amphiroa fragilissima on a Southwest Atlantic coral reef     

Maria Lilian F. Lima  Hilda H. Sovierzoski  Monica D. Correia 《Marine Ecology》2013,34(4):420-431

The species of Ophiuroidea that commonly occur on coral reefs can be found on different substrates and associated with other organisms including algae, sponges, and corals. This study evaluated the temporal variability of the ophiuroid fauna associated with the alga Amphiroa fragilissima on the Ponta Verde coral reef on the coast of Maceió in Alagoas, Northeastern Brazil. Replicate samples of algal substrate were collected at low tide during in the dry and rainy seasons, over a 10‐year period, from 1998–2007. Eight species of Ophiuroidea were identified, with a total of 8736 individuals associated with A. fragilissima. The most dominant and frequent species of Ophiuroidea were Amphipholis squamata and Ophiactis savignyi; all other species were rare. Cluster analysis and nMDS detected four groups, with two groups each occurring only in summer or winter periods, as well as other groups occurring in both periods.  相似文献   

Benthic community and biological trait composition in respect to artificial coastal defence structures: A study case in the northern Adriatic Sea     

《Marine environmental research》2013

Biological Traits Analysis (BTA) is a method for addressing ecological functioning based on traits exhibited by members of biological assemblages. This study explores and compares species and biological trait patterns on either side (landward and seaward) of coastal breakwater structures in northwestern Adriatic Sea (Italy), with the aim of giving insights and knowledge for management of sandy beach systems affected by coastal development. Eight ecological traits of 96 benthic species were considered. Taxon composition evidenced differences in benthic assemblages across time and exposure: landward and seaward communities shared less than 50% of the total number of species. BTA suggested a no-management effect in the functioning of benthic assemblages. Dominant traits modalities were deposit-feeding, short life, small body size, short life span, iteroparity, gonocorism, with plankto-planktotrophic larvae. The results of BTA highlighted similarities and stability in trait composition contrary to species composition, suggesting a possible persistence in benthic functioning despite the occurrence of species replacements. To best of my knowledge, this study is one of the first attempts to investigate the effects of a management measure (submerged shore-parallel barriers with groynes) in a shallow marine system by means of BTA.  相似文献   

Methane gas Seeps Along the Oxic/Anoxic Gradient in the Black Sea: Manifestations, Biogenic Sediment Compounds and Preliminary Results on Benthic Ecology   总被引：2，自引：0，他引：2  

Claudia Luth  Ulf Luth  Audrey V. Gebruk  &Hjalmar Thiel 《Marine Ecology》1999,20(3-4):221-249

Abstract. Sediment parameters (grain size, organic content, chloroplastic pigments, Adenylates, Potential hydrolytic activity and electron transport system activity) and benthic biota were studied in methane seep area south-west of the Crimean Peninsula in the Black Sea over a depth range from 60 to 260m. A control transect with similar depths was performed in an adjacent nonseep area. Methane seepage in this region occurs from 35 to ˜ 85m depth, passing the oxic anoxic interface zone at 130 to 180m. The methane seep areas were characterized by abundant carbonate precipitates which occurred in various shapes from small, flat structures to tall chimneys with increasing anoxia. The carbonates were associated with distinct bacterial mats. Most of the measured biochemical parameters in the sediment were quite similar in the seep and nonseep areas. The content of organic matter was higher and grain size was more uniform in the nonseep areas. However, the seep areas were charaterized by highter proportions of the larger fauna (size classes 0.5–1 mm and ≥ 1mm) as well as increased total numbers of benthic fauna in the suboxic and upper anoxic zone. The animals did not show any seep-specific adaptations. In addition to methane seepage, highly variable hydrochemical and sedimentary conditions on the lower shelf and upper slope may also play an important role in structuring the composition and distribution of the benthic fauna.  相似文献   

河南信阳南湾湖鸟类调查与多样性分析     

林英华  杜志勇  溪波  苏化龙 《湿地科学与管理》2012,8(3):48-52

2010年冬季与2011年春夏季,采用样线法对位于豫鄂交界处的信阳南湾湖鸟类多样性进行调查。结合历史资料,南湾湖共记录到鸟类16目40科110种,其中4目5科9种均为国家重点Ⅱ级保护野生动物;特有种或主要分布在我国的鸟类2目2科2种。留鸟40种,夏候鸟38种,冬候鸟9种,旅鸟23种。古北界鸟类42种,东洋界鸟类35种,广布种33种。研究区具有古北界种与东洋界种混杂的特点,古北界种鸟类占优势,分布型以北方鸟类为主。基于科属水平上的G-F指数计算结果显示,南湾湖的F指数、G指数与F-G指数分别是29.26、4.57、0.84,低于邻近的伏牛山鸟类各指数,显示南湾湖在鸟纲科属水平上与伏牛山鸟类多样性相异,且具有相对较低的鸟类多样性。  相似文献   

Composition, structural characteristics and temporal patterns of fish assemblages in non-tidal Mediterranean lagoons: A case study   总被引：2，自引：0，他引：2  

S. Maci  A. Basset 《Estuarine, Coastal and Shelf Science》2009,83(4):602-612

The importance of transitional water ecosystems as nursery habitats and feeding grounds for fish species is well-known. Detailed studies of colonization patterns of fish guilds in response to biotic and abiotic drivers are however unevenly distributed among ecosystem types. We address here the temporal variability of fish assemblages in small non-tidal lagoons in the Mediterranean basin. The study was carried out at the Acquatina lagoon (Lecce, Italy) where four stations, situated in two habitat types along a confinement gradient, were sampled twice per month for one year with fyke nets. Forty-five taxa ranging across 20 families were collected, with the most abundant species, Atherina boyeri, accounting for more than 95% of total abundance. Pooling all species together (excluding sand smelt), the structural features of the assemblage, relative abundance of families, and abundance of individual species all showed significant temporal patterns. Mean abundance peaked in Summer and Autumn and fell in Winter, whereas taxonomic richness and diversity were highest in Summer and lowest in Spring. Within the fish assemblage, multivariate ordination showed temporal segregation of species belonging to the same family or genus and expected to be functionally similar, suggesting that they avoid competition for space and resources by timing inward migration and peak occurrence differently. Of the environmental driving forces, which also showed temporal patterns of variation, salinity was the main factor affecting the distribution of individuals and species. The catch of young individuals of several marine species confirmed the role of this small lagoon as a nursery and feeding area, and emphasized the need for further studies.  相似文献   

秦皇岛七里海潟湖湿地非繁殖期鸟类多样性          下载免费PDF全文

戴宇飞  吴福星  赵丽媛  雷威  曾千慧  王先艳 《应用海洋学学报》2019,38(4):569-577

2016年9月至2017年4月,采用样线法和可变大小样方法相结合,对七里海潟湖湿地非繁殖期鸟类进行了调查研究。调查共记录到鸟类13目27科60种,其中雀形目鸟类10科14种,占物种总数量的23. 33%;非雀形目鸟类17科46种,占物种总数量的76. 67%。湿地水鸟数量占全部鸟类总数量的95. 11%,水鸟类群主要为鸥类、雁鸭类、鸻鹬类和鹭类。鸟类居留类型主要为旅鸟和夏候鸟,分别占物种总数量的35. 00%和33. 33%。鸟类区系方面,以古北界鸟类和广布种鸟类为主,分别占物种总数量的63. 33%和26. 67%。经统计,鸟类多样性指数、均匀度指数和丰富度指数的平均值分别是1. 86、0. 39和2. 31。七里海潟湖湿地位于东亚—澳大利西亚迁徙路线上,是重要的鸟类迁徙停歇地和觅食地,鸟类尤其是水鸟资源丰富,应当受到关注和保护。  相似文献