Ostracod fauna of salt Lake Acıgöl (Acı Tuz) (Turkey)

Lakes and wetlands in Mediterranean regions are overexploited and contaminated without sufficient local governmental control. The biodiversity of Salt Lake Ac?göl (Turkey), an internationally recognized ecosystem, is presently endangered by management plans. This study aims to analyse the ostracod community to establish its ecological status as a base for future paleoecological studies using ostracods to reconstruct the recent evolution of this wetland. Samples were collected seasonally and 13 species were recorded. Multivariate classification and ordination statistical methods revealed a major difference between assemblages related to the relative abundance of species tolerant of desiccation vs. species preferring permanent waters. Cyprideis torosa, mainly found in saline, low diversity sites, is a euryhaline species regarded as an indicator of future lake conditions if inappropriate water resource management continues.     

杭州西溪河浮游甲壳动物的群落结构

本文研究了杭州西溪河浮游甲壳动物的种类组成、种群动态、生物量及其与环境因子的关系 .全年中 ,共发现浮游甲壳动物 32种 ,其中枝角类 2 2种 ,桡足类 10种 .浮游甲壳动物年平均密度为 82 .1ind .·L- 1.,生物量 0 .2 58mg·L- 1.水体中叶绿素a含量、硝基氮含量、水温与浮游甲壳动物生物量之间均有明显的正相关性 .西溪河沿着水流方向污染程度逐渐加重 .本文还从污染水体的生物治理角度 ,讨论了治理西溪河生态环境的两点看法     

Ciliate—decapod epibiosis in two areas of the north-west Mediterranean coast

A study was carried out of the protozoan ciliate epibionts present on diverse decapod crustaceans from two areas of the north-west Mediterranean. A total of 92 crustaceans was examined (65 brachyurans and 27 anomurans, belonging to 15 species). Seventeen ciliate species were identified (two heterotrichs, two chonotrichs, ten suctorians, and three peritrichs). This is the first record of the family of folliculinid ciliates as epibiont on crustaceans in Mediterranean waters. The suctorian Acinetides symbiotica, considered endemic to Lake Nyassa, was found in the sampling areas. Local variations, microlocation on the surface and anatomical units of the decapods, and differential distribution of epibionts were also considered.     

Microscopic morphology of the antennule and antenna of the marine isopod Cirolana harfordi

ABSTRACT

The use of scanning electron microscopy on the cuticle outgrowths called setae (that contain sensilla) in crustaceans is useful for, understanding how crustacean species sense their environment and for taxonomic studies. So far, most of the setal morphology studies have been performed on decapod crustaceans such as lobsters and shrimps and there has been a comparative lack of such research on marine isopods, from which terrestrial isopods such as woodlice or slaters have evolved. In the current study, electron microscopy was used to study the antennal setae of the marine isopod Cirolana harfordi using magnification powers of up to 40, 000. C. harfordi displayed a number of setal types including setae that had a sub-terminal pore that contained a cupule-shaped structure and plumose setae which are pennate in structure and have two rows of setules along the setal shaft in a fashion analogous to a palm leaf. These plumose setae may be useful to the animal in detecting water currents. Differences in the structure and placement of setae on the antennae of C. harfordi as compared to two other marine isopods, Bathynomus pelor and Natatolana borealis (that have had a comprehensive study of antennae setal morphology performed on them in previous studies) indicate that scanning electron microscopy of isopod setae may be useful in taxonomic studies of isopods.     

从虾、蟹壳制取壳聚糖的工艺研究

本文以虾、蟹的皮壳为原料,从中提取生物高分子甲壳素,再经浓碱处理得到其改性衍生物——壳聚糖.     

滤食性鲢鱼对浮游甲壳动物群落影响的实验研究

采用围隔实验的方法研究滤食性鲢鱼对浮游甲壳动物群落的影响。实验设置4个鲢鱼生物量水平；0（无鱼），116（低密度）、176（中等密度），316（高密度)g/m^2。枝角类和剑水蚤的生物量在无鱼围隔中显著较高，而哲水蚤的生物量在低密度围隔中显著较高，研究表明：滤食性鲢鱼的捕食，能有效抑制技角类和剑水蚤的生长；哲水蚤具有较强的逃避滤食性鱼类捕食的能力，但在高水平的捕食压力下，滤食性链鱼仍然能够有效抑制哲水蚤的生长。     

甲壳动物酚氧化酶分子结构与生物化学性质的研究进展

酚氧化酶是一种含铜金属酶,是酚氧化酶原激活系统级联反应链中的关键酶,通过催化黑化反应在无脊椎动物非特异性免疫中具有重要作用。本文综述了甲壳动物酚氧化酶的分子结构及其生物化学性质。     

The freshwater crustaceans (Cladocera: Copepoda) of Bering Island (Commander Islands,Russian Far East): species richness and taxocene structure

The crustaceans of the fresh waters of Bering Island and their link to the fauna of adjacent regions were studied. Based on original data and existing literature, the species composition of Cladocera and Copepoda was described. The compiled list includes 22 species of Cladocera and 30 species of Copepoda. In the original data, 35 species native to the Commander Islands were reported for the first time. Six species were newly reported in the Far East, and two were newly reported in Russia. The ecological peculiarities of several species and some biogeographical features of the freshwater zooplankton of the island are discussed. The main part of the fauna of the island form Holarctic widespread species (64.3%), another slightly smaller group of the fauna is comprised of Palaearctic species (20.1%), and the remainder comprise Nearctic (6.7%) and Beringian species (8.9%). Particular patterns in the distribution of freshwater zooplankton and the factors underlying the occurrence of these species on the island are considered.     

Aspects of the life history and origins of Nesolecithus africanus (cestoda: Amphilinidea)

Larvae of the amphilinidean platyhelminth Nesolecithus africanus are reported and described from the freshwater prawn Desmocaris trispinosa in Nigeria. The worms were found in the haemocoel of female prawns and appear to restrict ovarian development. Taxonomic, zoogeographical and evolutionary relationships of the species with its South American relative, N. janickii, are discussed. These species are very similar morphologically, and restricted to parts of the African and South American continents which were adjacent in Cretaceous times. They are probably vicariant Gondwanaland relicts, little changed over the past 100 million years. Two theories of amphilinidean origin are discussed.