干旱区生态环境知识资源中心(Arid): Tolerance to salinity and dehydration in the Sahara Desert blue-eyed turtle, Mauremys leprosa saharica (Testudines: Geoemydidae) from a brackish pond in the Lower Draa basin, southern Morocco

Arid

DOI	10.1080/21564574.2019.1645746
	Tolerance to salinity and dehydration in the Sahara Desert blue-eyed turtle, Mauremys leprosa saharica (Testudines: Geoemydidae) from a brackish pond in the Lower Draa basin, southern Morocco
	Loulida, Soumia 1,2; Znari, Mohammed 1,2; Naimi, Mohamed 2,3; Bendami, Safaa 1,2
通讯作者	Loulida, Soumia
来源期刊	AFRICAN JOURNAL OF HERPETOLOGY
ISSN	2156-4574
EISSN	2153-3660
出版年	2019
卷号	68 期号:1 页码:58-76
英文摘要	The marginal populations of the Sahara blue-eyed pond turtle, Mauremys leprosa saharica, in the southern-most species distribution range in the pre-Saharan areas of north-west Africa, are faced with extreme environmental conditions of arid climate and anthropogenic and climate change mediated water and land salinisation. In the current study, we investigated a small and isolated population of M. l. saharica at Sidi El Mehdaoui oasis in the Lower Draa River, southern Morocco, in order to assess its osmo- and iono-regulatory abilities and tolerance to salinity and dehydration. Upon capture, turtles were weighed and measured for shell dimensions and blood and voided urine were taken. Tests of exposure to different levels of water salinity (0%, 35%, and 50% seawater) and maintenance out of water (estivation simulation) were carried out. Osmolalities and Na+, Cl-, K+, and urea concentrations were determined in plasma and voided urine, and glycaemia was measured in blood, before and after tests. Turtles were able to survive in brackish waters with a salinity as high as 24% seawater (8.4 ppt). Their voided urine was hypotonic to plasma, which indicated that they could use their bladder water reserves for osmo- and iono-regulation until the iso-osmocity level beyond which osmotic and ionic anhomeostasy can occur. Experimental tests showed that the osmo- and iono-regulatory capacities of these turtles are relatively limited, and not enough effective to allow them to survive for long-term periods in brackish/saline waters or out of water, because of dehydration indicated by progressive weight loss to a critical threshold. The increased drought, water salinisation and habitat fragmentation related to anthropogenic activities and climate change, represent great threats that can create habitats exceeding the species' threshold for a long-term persistence of the vulnerable small marginal populations of the Saharan pond turtle. So, conservation measures of these populations and their habitats are urgently needed.
英文关键词	Aridity marginal populations plasma osmolality salinisation urine water deprivation
类型	Article
语种	英语
国家	Morocco
收录类别	SCI-E
WOS记录号	WOS:000483530500001
WOS关键词	TERRAPIN MALACLEMYS-TERRAPIN ; MUD TURTLE ; WATER ; ESTIVATION ; OSMOREGULATION ; SALINIZATION ; PHYSIOLOGY ; ESTUARINE ; RESPONSES ; SCRIPTA
WOS类目	Zoology
WOS研究方向	Zoology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/213919
作者单位	1.Cadi Ayyad Univ, Fac Sci Semlalia, Marrakech, Morocco; 2.Cadi Ayyad Univ, Nat Hist Museum Marrakech, Marrakech, Morocco; 3.Sultan Moulay Slimane Univ, Polidisciplinary Fac, Beni Mellal, Morocco
推荐引用方式 GB/T 7714	Loulida, Soumia,Znari, Mohammed,Naimi, Mohamed,et al. Tolerance to salinity and dehydration in the Sahara Desert blue-eyed turtle, Mauremys leprosa saharica (Testudines: Geoemydidae) from a brackish pond in the Lower Draa basin, southern Morocco[J],2019,68(1):58-76.
APA	Loulida, Soumia,Znari, Mohammed,Naimi, Mohamed,&Bendami, Safaa.(2019).Tolerance to salinity and dehydration in the Sahara Desert blue-eyed turtle, Mauremys leprosa saharica (Testudines: Geoemydidae) from a brackish pond in the Lower Draa basin, southern Morocco.AFRICAN JOURNAL OF HERPETOLOGY,68(1),58-76.
MLA	Loulida, Soumia,et al."Tolerance to salinity and dehydration in the Sahara Desert blue-eyed turtle, Mauremys leprosa saharica (Testudines: Geoemydidae) from a brackish pond in the Lower Draa basin, southern Morocco".AFRICAN JOURNAL OF HERPETOLOGY 68.1(2019):58-76.