Unusual massive phytoplankton bloom in the oligotrophic Lake Tanganyika
نویسندگان
چکیده
Background and aims – Massive algae growth resulting in a phytoplankton bloom is very rare event the meromictic oligotrophic Lake Tanganyika. Such was observed north of lake September 2018. Phytoplankton species composition during this compared to documented 1955, 2011–2013. Meteorological observations suggest hydrodynamics could explain occurrence 2018 bloom.Material methods net samples were taken pelagic littoral zone near Uvira five consecutive days For period 2011–2013, quantitative obtained weekly sampling at same sites. Samples analysed with an inverted microscope relative abundances algal compared. Key results Dolichospermum flosaquae (Cyanobacteria) initially dominated followed by high abundance Limnococcus limneticus on third day In increase Nitzschia asterionelloides (Bacillariophyta), Dictyosphaerium Lobocystis (Chlorophyta) while increasing dinophytes noted. also responsible for reported but only sporadically 2011–2013 samples. Although present it never reached as bloom. data indicate that experienced different conditions previous years: strong south-east winds from May more eastern direction wind, well-marked drop atmospheric pressure between August September.Conclusion After windy season, combination hydrodynamics, calmer conditions, solar radiation air temperature favourable massive Cyanobacteria
منابع مشابه
Unusual bacterioplankton community structure in ultra-oligotrophic Crater Lake
The bacterioplankton assemblage in Crater Lake, Oregon (U.S.A.), is different from communities found in other oxygenated lakes, as demonstrated by four small subunit ribosomal ribonucleic acid (SSU rRNA) gene clone libraries and oligonucleotide probe hybridization to RNA from lake water. Populations in the euphotic zone of this deep (589 m), oligotrophic caldera lake are dominated by two phylog...
متن کاملTropheus 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 کاملModeling the effect of invasive quagga mussels on the spring phytoplankton bloom in Lake Michigan
Index words: Numerical modeling Lake Michigan Phytoplankton Quagga mussels The disappearance of the spring phytoplankton bloom in Lake Michigan has been attributed in some studies to the direct effect of quagga mussel filter-feeding. We applied a biophysical model to test whether the observed reduction in the spring bloom can be explained by direct effects of quagga mussel grazing. We developed...
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 کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Plant Ecology and Evolution
سال: 2021
ISSN: ['2032-3921', '2032-3913']
DOI: https://doi.org/10.5091/plecevo.2021.1890