Ostracods from water bodies in hyperarid Israel and Jordan as habitat and water chemistry indicators
Ostracods from water bodies in hyperarid Israel and Jordan as habitat and water chemistry indicators
复制标题
DOI：
10.1016/j.ecolind.2011.07.017
复制
发表时间：
2012-03
影响因子：
6.9
通讯作者：
S. Mischke;H. Ginat;B. Al-Saqarat;A. Almogi‐Labin
中科院分区：
文献类型：
--
作者：
S. Mischke;H. Ginat;B. Al-Saqarat;A. Almogi‐Labin
以色列和约旦的超干旱地区覆盖了大片地区，其中许多更新世湖泊沉积物表明，更新世期间的气候条件明显湿润。近几十年来，这一区域的干旱程度显著增加，现有的地表沃茨数量正在迅速减少。我们研究了介形虫壳从49个池塘和溪流网站，以确定物种分布和推断生态偏好，特别是在水的运动，电导率和离子组成的一般差异。共鉴定出介形类22种，其中12个类群分布于3个或3个以上的地点。在稀有物种中，Cyprinotus scholiosus是在也门和沙特阿拉伯的上新世和更新世遗址的两次记录后首次被确定的。此外，Paracypretta amati被记录，并讨论了其生态偏好的第一次描述的物种从其模式产地在苏丹。长体海蛞蝓（Cypridopsis elongata）是唯一典型的生活在湖泊栖息地的生物，严格地偏好淡水条件和碱度/钙比约为1的沃茨，阳离子以Ca 2+为主，阴离子以HCO 3 −为主。相反，Cyprideis torosa，Limnocythere inopinata和Heterocypris incongruens显然更喜欢以Na+与阳离子和Cl−与阴离子为主的沃茨。Heterocypris salina和C. torosa出现在宽的电导率（或盐度）范围内，并且在碱度/Ca比约为1并且具有显著碱度耗尽的沃茨中。半裂体Humphcypris subdrocea、Ilyocypris spp.和H.盐沼是唯一的类群，不显示任何偏好方面的阳离子和阴离子优势的沃茨。本文详细讨论了研究区水体中介形虫种类的生态偏好，并通过对更新世水生沉积物介形虫种类组成的分析，定性评价了当前极端干旱环境下原水体的水动力和水化学条件。
The hyperarid region of Israel and Jordan covers a large area where numerous sites of Pleistocene lake sediments suggest that climate conditions were significantly wetter during the Pleistocene. This region experienced a significant increase in aridity in recent decades and the number of existing surface waters is diminishing rapidly. We studied ostracod shells from 49 pond and stream sites to determine the species distribution and to infer ecological preferences especially with respect to general differences in water movement, conductivity and ion composition. Twenty-two ostracod species were identified in total of which 12 taxa occur at three or more sites. Among the rarer species, Cyprinotus scholiosus was identified for the first time after two records from Plio- and Pleistocene sites in Yemen and Saudi Arabia. Further, Paracypretta amati was recorded and its ecological preferences discussed for the first time following the description of the species from its type locality in Sudan. Cypridopsis elongata is the only typical inhabitant of lotic habitats, strictly preferring freshwater conditions and waters with an alkalinity/Ca ratio around 1 and cations dominated by Ca2+and anions by HCO3−. In contrast, Cyprideis torosa, Limnocythere inopinata and Heterocypris incongruens apparently prefer waters dominated by Na+associated with cations and Cl−associated with anions. Heterocypris salina and C. torosa occur over a wide conductivity (or salinity) range and in waters with alkalinity/Ca ratios around 1 and with significant alkalinity depletion. Humphcypris subterranea, Ilyocypris spp. and H. salina are the only taxa which do not show any preference with respect to both the cation and anion dominance of the waters. The ecological preferences of the ostracod species from water bodies in the study area are discussed in detail and can be used for a qualitative assessment of the hydrodynamical and hydrochemical conditions of former water bodies in the presently hyperarid environment based on ostracod species composition analysis of Pleistocene aquatic sediments.