Seasonal variation in biomarker responses of Donax trunculus from the Gulf of Annaba (Algeria): Implication of metal accumulation in sediments     

《Comptes Rendus Geoscience》2018,350(4):173-179

The aim of the present study was to test biomarker responses in an edible mollusk, Donax trunculus L. (Mollusca, Bivalvia) associated with environmental pollution in the Gulf of Annaba (northeastern Algeria). The biomarkers selected were glutathione S-transferase (GST), acetylcholinesterase (AChE) and metallothioneins (MTs). Samples were collected seasonally (September 2014, and January, April and July 2015) from two sites located over the Gulf of Annaba: El Battah and Sidi Salem. The results obtained reveal that autumn and winter were the two seasons that show an increase in GST activity, an inhibition of AChE activity and a high rate of MT. In addition, a decrease in AChE activity, an increase in both GST activity and MT levels in D. Trunculus collected from Sidi Salem in comparison with those of El Battah were observed. The biomarker responses at the Sidi Salem site reflect the presence of certain pro-oxidative compounds such as metals (Cd, Cu, Pb, Zn, Mn and Fe) determined in sediments in winter (January) 2015. Moreover, metal concentrations, except Fe, were higher at Sidi Salem than at El Battah. Overall, the Gulf of Annaba remains contaminated by heavy metal. However, this metallic contamination is relatively low and the risks for local population via this edible species were also low.  相似文献   

Changes in the dynamics of shallow sandy-bottom assemblages due to sand extraction in the Catalan Western Mediterranean Sea   总被引：6，自引：1，他引：6  

Sarda  R.; Pinedo  S.; Gremare  A.; Taboada  S. 《ICES Journal of Marine Science》2000,57(5):1446-1453

  相似文献   

分子遗传标记技术在双壳贝类研究中的应用   总被引：2，自引：0，他引：2  

吕红丽  侯林  张静  姚锋  王伟  高岩 《海洋湖沼通报》2004,(1):22-27

分子遗传标记是随着分子生物学技术的发展而出现的遗传学标记技术,它突破了形态和细胞水平上遗传标记的局限性,发挥着独特的优势.分子遗传标记目前已出现了几十种,本文主要介绍了同工酶、RFLP、SSR、RAPD这几种常用的分子遗传标记方法在双壳贝类的分类学、遗传多样性研究、遗传育种研究、病理学研究等方面的应用.通过本文可以看出,分子遗传标记多应用在分类学、遗传多样性、遗传育种方面,涉及的种类较广,但主要集中于珠母贝和牡蛎的研究上.  相似文献   

Study on impact of dinoflagellate Alexandrium tamarense on life activities of marine bivalves   总被引：2，自引：1，他引：2  

Yan Tian  Zhou Mingjiang  Fu Meng  Wang Liping 《海洋学报(英文版)》2003,22(1):103-109

The effects of a PSP producing dinoflagellate Alexandrium tamarense on marine bivalvesat their several important life stages: egg, D- shape larva, eyespot larva, juvenile and adult, were studied. The results show that the hatching, survival, activity, filtration and growth were adversely affected by the alga and the impact was significantly increased with the increase of algal density. The inhibitory effect on egg hatching was most significant, which the hatching rate was only 30% of the control when exposed to the alga at 100 cell/cm3 after 36 h. Further experiments show that the algal culture, re-suspended cells and cell fragments had the inhibitory effect, while no such effect was from the cell-free medium, cell contents and standard STX. The results indicate that the alga could produce unknown toxins, rather than PSP, associated with the cell surface.  相似文献   

Bedload abrasion and the in situ fragmentation of bivalve shells     

ANDREW J. NEWELL  DAVID J. GOWER†  MICHAEL J. BENTON‡  VALENTIN P. TVERDOKHLEBOV§ 《Sedimentology》2007,54(4):835-845

The aim of this study was to determine how Unio bivalve shells fragment within the channel of the Sakmara River (southern Urals, Russia). The Sakmara River has an abundant bivalve population and a highly variable flow regime which, at low flow, allowed much of the channel bed to be examined. A large data set of 1013 shells (Unio sp.) was examined and these were shown to have consistent patterns of orientation, aspect, shell abrasion, perforation and fracture. The close spatial relationship between areas of shell abrasion, shell perforation and shell fracture showed that they form part of a continuum whereby areas of abrasion evolve into perforations and perforations coalesce and enlarge into fractures. The mechanism of shell damage proposed is one of abrasion in place, whereby the shell remains stationary on the surface of the point bar and is impacted by bedload. Underpinning this process are the hydrodynamic properties of the bivalve shell, with consistency in the orientation and aspect of the valve in a flowing current producing consistency in the distribution of damage on the shell surface. Valves preferentially lie in a convex‐up position and orientate in the flow such that the umbo faces upstream. The elevated, upstream‐facing umbo region is exposed to particle impact and is the first to be abraded and perforated. The vulnerability of the umbo to perforation is greatly increased by the thinness of the shell at the umbo cavity. The in situ abrasion process is enhanced by the development of an armoured gravel bed which restricts valve mobility and maintains shells within the abrasion zone at the sediment–water interface. The in situ abrasion process shows that broken shells are not a reliable indicator of long distance transport. The study also raises the issue that tumbling barrel experiments, which are generally used to simulate shell abrasion, will not replicate the type of directionally focused sand‐blasting which appears to be the principal cause of shell fragmentation in the Sakmara River.  相似文献   

惠安南埔湾海水养殖区一次油污染的监测     

潘皆再  曾昭文 《台湾海峡》1994,13(4):400-403

对福建炼油厂１９９３年２月１２日溢油事故的监测结果表明，惠安县南埔湾的天竺，张俱，仑头一带养殖区域已受到溢油的严重污染。湾内养殖的主要经济贝类活体的油含量大大高于长江口以南沿岸海域同种类的生物样，其中养殖区域的牡蛎，缢蛏，花蛤活体内油含量分为（２３８－２２７０）×１０×－×６（ｍ／ｍ），２８４０×１０＾－＾６（ｍ／ｍ），（２７６－２９４）×１０＾－＾６（ｍ／ｍ），平均死亡率高达７０％以上，残活生物  相似文献   

Discovery of marine Upper Jurassic-Lower Cretaceous rocks in Uttaradit Province: a new approach for paleoenvironment and tectonic settings     

T. CHAROENTITIRAT  J. YINGYUEN  A. MEESOOK  P. CHARUSIRI 《地球学报》2009,30(Z1):4-4

The sedimentary rocks exposed in the study area, the Cham Bon reservoir and nearby area in Phichai District, Uttaradit Province, Thailand were grouped as non-marine Jurassic Phra Wihan Formation of the Khorat Group. After the previous reconnaissance by geologists of Department of Mineral Resources of Thailand, marine bivalves have been newly discovered in this area. This made us eagerly to examine the sedimentology, stratigraphy and geotectonic evolution of this region. The purpose of this research is to study in detail the sedimentary rocks in order to reconstruct the depositional environment. Two sections, the Cham Bon section and another section at 58 km-stone of Highway no.11, have been measured and 25 samples were petrographically examined. The Cham Bon sec-tion, which is 252 m thick, can be lithologically di-vided into 3 parts: the lower, middle and upper parts. The lower part is characterized by thick-bedded and massive quartz arenite.  相似文献   

西藏南部晚白垩世厚壳蛤的锶同位素年龄标定   总被引：11，自引：0，他引：11  

黄思静  石和  张萌  武文慧  沈立成  黄成刚 《地球科学》2005,30(4):437-442

沉积岩样品年龄的直接标定是沉积学与地层学研究的难点之一.由于锶在海水中的残留时间(≈106a) 大大长于海水的混合时间(≈103a), 因而同一时间全球海水的锶元素在同位素组成上是均一的, 并造成地质历史中海水的锶同位素组成是时间的函数, 这是锶同位素地层学(SIS) 的基本原理和利用锶同位素地层学进行海相地层定年的理论基础.本文根据锶同位素地层学的基本原理, 测试了西藏南部岗巴剖面上白垩统宗山组上段地层中厚壳蛤化石的锶同位素组成, 尝试对这些化石进行了年龄标定, 4个样品分别位于剖面累计厚度381, 362, 358和296m处, 其87Sr/86Sr比值分别为0.707832, 0.707769, 0.707768和0.707695, 年龄的标定结果分别是65.68, 69.34, 69.39和72.32Ma, 定年的平均误差为±1Ma左右.研究结果表明, 锶同位素地层学在海相地层定年方面具有潜在价值.   相似文献