石臼坨鸟类保护区规划探讨

通过对石臼坨岛群鸟类资源及其环境综合评价，阐述建立石臼坨鸟类保护区的重要性和迫切性，保护区的建设原则，保护区的范围和功能分区，以及保护与治理的措施。     

湿地来了新“客人”

近日,商丘市睢阳区南湖湿地迎来了一群特殊的“客人”——东方白鹳。东方白鹳属于大型涉禽,是国家一级保护动物,主要在东北地区中北部繁殖,被列为濒危物种,全球仅存4000余只,有“鸟界国宝”“鸟类大熊猫”之称。     

恐龙蛋的大小

恐龙的蛋大小不一,就像今天的鸟类的蛋那样。已知最小的恐龙蛋仅2厘米—3厘米大,这显然是很小的恐龙下的蛋。有些恐龙蛋大小如鸡蛋,下这种蛋的恐龙个子要大一点。大多数恐龙蛋平均直径在10厘米—20厘米之间,与鸵鸟蛋相近或比鸵鸟蛋大些。身长6米的慈母龙(一种鸭嘴龙)下的卵圆形的蛋长轴约20厘米。据老资料,法国曾发现一枚长轴30.48厘米,短轴25.4厘米的恐龙蛋化石。这枚与篮球尺寸相近的化石蛋,一度曾被誉为是世界上最大的恐龙蛋。但是,1993年在我国河南省南阳地区出土的大量恐龙蛋化石中,发现有极少数是巨型蛋,样子像个哈密瓜,长轴达50厘米,堪称世界之最。一般而言,恐龙蛋大小尺寸之间的差距不是太大的,     

The First Mesozoic Heterodactyl Bird from China

1 Introduction Enantiornithines were the dominant birds nearly worldwide throughout the entire span of the Cretaceous (Chiappe, 1995; Feduccia, 1996). The adaptive radiation of opposite birds is little known besides the disparity of rostral morphology in Boluochia (Zhou, 1995), Longipteryx (Zhang et al., 2001), Longirostravis ( Hou et al., 2004), and the presence of stomach contents that reflect a diversity of diets. Like the structure of rostrum, differentiation of the locomotor apparatu…     

扎陵湖-鄂陵湖国际重要湿地鸟类群落物种多样性北大核心CSCD

2019年8月至2020年10月,采用样线法和样点法,在扎陵湖-鄂陵湖国际重要湿地开展了鸟类调查,将调查结果与历史文献资料相结合,对在该湿地分布的鸟类进行了梳理和编目。研究结果显示,在扎陵湖-鄂陵湖国际重要湿地,共记录13目28科77种鸟类,其中,有雀形目鸟类11科23种(占总物种数量的29.87%),有非雀形目鸟类17科54种(占总物种数量的70.13%);有水鸟6目10科35种,占记录的总物种数量的45.45%,其个体数量占全部调查鸟类总个体数量的93.07%;在77种鸟类中,有8种为国家一级保护鸟类,有11种为国家二级保护鸟类;2019年8月鸟类群落的Shannon-Weaver多样性指数(2.67)和Pielou均匀度指数(0.51)都相对最大,即8月鸟类群落的多样性水平相对较高。扎陵湖-鄂陵湖国际重要湿地是中亚鸟类迁徙路线上重要的候鸟繁殖地和停歇地,应该完善该湿地的鸟类监测与保护网络。     

岩鹭在厦门海岸带的分布及其生态考察

岩鹭是我国二级保护鸟类,处于稀有的濒危状态。１９９３年３￣５月,１９９３年９月至１９９４年９月和１９９５年５￣１０月的考察结果。证实岩鹭在厦门的居留时间为１０月上旬至６月上旬。厦门的岩鹭分布于东部海岸,该区域人为干扰和污染少,潮间带底质以砂砾,岩石为主,厦门的岩鹭为灰黑色型,单独活动,种群总数量只有３￣５只,本文根据岩鹭的生态需求、行为习怀和种群数量特点,对岩鹭的保护也进行了讨论。     

泉州湾河口湿地鸟类的种类组成与分布

本文根据1988-1999年进行4次泉州湾河口湿地鸟类调查资料，研究了泉州湾河口湿地自然概况，首次报道了该区鸟类13目30科108种，指出泉州湾河口地区鸟类栖息地面临的威胁因素，建议建立泉州湾河口湿地保护区以保护该区的自然生态系统和鸟类资源。     

Geochemical and Sr-Nd isotopic study of alkaline syenites in Liangtun-Kuangdonggou, Liaoning Province, China： Evidence for enriched mantle before 1.86 Ga and implications

The 1.86 Ga Liangtun-Kuangdonggou complex (LKC) is one of the oldest alkaline syenite bodies so far discovered in China. This syenite suite has elevated contents of total alkali (K2O Na2O), with an average of 10.50%, and a mean Rittmann Index (σ) of 6.48. The intrusions have slightly higher concentrations of K2O than those of Na2O on a weight percent basis, indicating the rocks belong to potassium-rich alkaline syenite series. Total rare-earth element concentrations (∑REE ) of the rocks are relatively high, ranging from 324×10 -6 to 1314×10 -6, with a mean value of 666×10 -6. The REE patterns are subparallel and rightward steep with (La/Yb)N >33, showing mild negative to positive Eu anomalies (δEu: 0.63-1.15). All samples exhibit strong LILE and LREE enrichments and TNT (Nb, Ta, Ti) and P depletions in multi-element spidergrams. On the εSr(t)-εNd(t) correlation diagram, most analytical data points plot within the enriched mantle field with low ( 87Sr/86Sr)i ratios (0.7045-0.7051) and negative εNd(t) values (-3.72--3.97), falling among those kimberlites from Fuxian County, Liaoning Provinve, from Mengyin County, Shandong Province and the Ⅱ-type kimberlites from South Africa. These characteristics imply that the LKC-rocks may have the same source as the above-mentioned kimberlites, i.e., they have close connections to the materials derived from enriched mantle reservoirs, further revealing that the upper mantle beneath the northeastern part of the North China Plate had been highly enriched before 1.86 Ga. Geodynamically, the LKC-rocks were formed in a within-plate environment with close genetic connections to rift-related alkaline magma activities possibly controlled by ancient mantle plumes.     

宁德市东湖湿地鸟类资源调查与保护

2003年3月-2004年4月,在宁德三都湾东湖湿地及其周边地区进行了10次湿地鸟类资源连续调查。调查表明:宁德东湖湿地生物多样性丰富,特别是湿地水禽种类繁多,数量巨大,发现鸟类12目26科80种,计20119只。宁德东湖湿地是福建省鸟类资源的重要分布区,是各类水禽的理想栖息地、越冬地和迁徙地,但存在因开发建设湖面缩小、市区大量生活污水污染水质、湖体淤积、陆地化过快等问题。为此,保护和恢复东湖湿地、建立湿地公园已是势在必行。