Tanganyika Shells
نویسندگان
چکیده
منابع مشابه
Tropheus Evolution In Tanganyika Lake
African lakes have produced striking variation in cichlid fish fauna. Lake Tanganyika, whose age is estimated at 9 to 12,000,000 years, is the oldest East African lake and hides morphologically, genetically and behaviorally diverse group cichlid fish. Many of the more than 200 described species is divided into geographically and genetically distinct populations that differ primarily in their co...
متن کاملNutrient dynamics of Lake Tanganyika
The large and productive fishery of Lake Tanganyika is an important source of income and nutrition for the surrounding areas. This fishery, based primarily on pelagic clupeids (Kiswahili: dagaa), is very productive, and provides a readily available, nutritious, and inexpensive source of protein to the rapidly growing human populations in this area. The regional importance of the Lake Tanganyika...
متن کاملUpwellings recorded in Lake Tanganyika mussels
Biogenic productivity of Lake Tanganyika is highly dependent on seasonal upwellings of anoxic deep waters. We investigated the shell of freshwater bivalve Pleiodon spekii as a geochemical archive of these periodic hydrological changes tuned by the monsoon regime. The results of a 2-years-long geochemical survey of the coastal waters 5 performed on the dissolved and particulate fractions were pu...
متن کاملBiomechanics of turtle shells: how whole shells fail in compression.
Turtle shells are a form of armor that provides varying degrees of protection against predation. Although this function of the shell as armor is widely appreciated, the mechanical limits of protection and the modes of failure when subjected to breaking stresses have not been well explored. We studied the mechanical properties of whole shells and of isolated bony tissues and sutures in four spec...
متن کاملStudy of nova shells
We present Hα direct imaging and shell spectroscopic observations of two classical novae: FH Ser 1970 and QU Vul 1984. The distances, reddenings, luminosities at maximum, and the mass of the shell ejected by FH Ser are derived and discussed.
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ژورنال
عنوان ژورنال: Nature
سال: 1881
ISSN: 0028-0836,1476-4687
DOI: 10.1038/025101b0