Phytoplankton and zooplankton abundance and seasonal distribution in Eighteenmile Creek, NY

The objective of this study workplan is to determine the health of the planktonic community in the Eighteenmile Area of Concern (AOC) and to establish the status of the Use Impairment Indicator in the Eighteenmile Creek Remedial Action Plan (RAP). Results from this study will be compared to results of previously studied community structure data from control / reference sites: an undisturbed creek on the south shore of Lake Ontario (Yanty Creek), the open waters of Lake Ontario, and from Braddock Bay on Lake Ontario

Identificación de diatomeas epilíticas asociadas a la calidad de agua del río Illuchi, cantón Latacunga, provincia de Cotopaxi, período octubre 2020 - marzo 2021.

In this research was possible to identify different species of epilithic diatoms associated with the water quality of the Illuchi river, where a total of 31 epilithic diatoms species were identified at the water resource; The sampling was carried out at three specific points along the river during November, December 2020 and January 2021; at the high point (Laguna de Salayambo) 29 species were found where 8 are abundant: Cyclostephanos invisitatus, Fragilaria arcus, Fragilaria ulna, Melosira varians, Nitzschia acicularis, Nitzschia linearis, Rhoicosphenia abbreviata, Tabellaria flocculosa; while at the midpoint (Hacienda Noelanda) 30 species were identified of which 9 are abundant: Achnanthidium minutissimum, Cyclostephanos invisitatus, Diatoma mesodon, Epithemia turgida, Fragilaria arcus, Grunowia sinuata, Melosira varians, Pinnularia maior, Rhoicosphenia abbreviata; finally in the low point (Barrio Saragosín) there were 31 species where 7 were considered abundant among which are: Cocconeis lineata, Diatoma mesodon, Epithemia turgida, Fragilaria arcus, Fragilaria ulna, Gomphonema clavatulum, Rhoicosphenia abbreviata; recognizing a total of 6228 individuals at the three sampling points. To calculate the Water Quality Index (ICA), 9 physical-chemical and microbiological parameters were used, among them: (pH, Temperature, Turbidity, Dissolved Oxygen, Total Dissolved Solids, Nitrates, Phosphates, Fecal Coliforms and Biochemical Oxygen Demand '' BOD5 ''), which were processed in the IQAData program, where point 1 obtained a result of 70.18 indicating a Regular rating, while point 2 indicated a Regular rating with a value of 52.2 and finally in point 3 had a value of 46.87 being its Bad rating. Subsequently, the Water Quality Trophic Index (ITCA) was compared through its tables; where point 1 obtained a value of 1.41 indicating that it is an oligotrophic value, that is, its contamination is negligible, at point 2 the value was 1.53 being β-mesotrophic, that is, it has moderate contamination and for point 3 it gave a value of 2.61 verifying an α-mesotrophic state that indicates strong contamination. Therefore, in this study, diatoms are related to the river water quality index, since while the parameters mentioned above vary, they will increase or decrease considerably; but in turn there will be climatic factors that alter the study, such as the rainfall that altered the chlorophyll level at point 1 during the month of December.En el presente proyecto de investigación se logró identificar diferentes especies de diatomeas epilíticas asociadas a la calidad del agua del río Illuchi, cantón Latacunga, provincia de Cotopaxi, en donde se identificó un total de 31 especies de diatomeas epilíticas en el recurso hídrico; se realizó el muestreo en tres puntos específicos a lo largo del río durante los meses de noviembre, diciembre 2020 y enero 2021; en el punto alto (Laguna de Salayambo) se encontró 29 especies donde 8 son abundantes: Cyclostephanos invisitatus, Fragilaria arcus, Fragilaria ulna, Melosira varians, Nitzschia acicularis, Nitzschia linearis, Rhoicosphenia abbreviata, Tabellaria flocculosa; mientras que en el punto medio (Hacienda Noelanda) se identificó 30 especies de las cuales 9 son abundantes: Achnanthidium minutissimum, Cyclostephanos invisitatus, Diatoma mesodon, Epithemia turgida, Fragilaria arcus, Grunowia sinuata, Melosira varians, Pinnularia maior, Rhoicosphenia abbreviata; finalmente en el punto bajo (Barrio Saragosín) existieron 31 especies donde 7 se consideraron abundantes entre las cuales están: Cocconeis lineata, Diatoma mesodon, Epithemia turgida, Fragilaria arcus, Fragilaria ulna, Gomphonema clavatulum, Rhoicosphenia abbreviata; reconociendo en los tres puntos de muestreo un total de 6228 individuos. Para calcular el Índice de calidad del agua (ICA) se utilizó 9 parámetros físico-químicos y microbiológicos entre ellos: (pH, Temperatura, Turbidez, Oxígeno Disuelto, Solidos Disueltos Totales, Nitratos, Fosfatos, Coliformes Fecales y Demanda Bioquímica de Oxígeno ‘‘DBO5’’), los cuales se procesaron en el programa IQAData, donde el punto 1 obtuvo un resultado de 70,18 indicando una calificación Regular, mientras que el punto 2 indicó una calificación Regular con un valor de 52,2 y por último en el punto 3 tuvo un valor de 46,87 siendo su calificación Mala. Posteriormente, se comparó el Índice Trófico de Calidad del Agua (ITCA) mediante sus tablas; donde el punto 1 obtuvo un valor de 1,41 indicando que es un valor Oligotrófico es decir su contaminación es despreciable, en el punto 2 el valor fue de 1,53 siendo β-mesotrófico es decir posee contaminación moderada y para el punto 3 dio un valor de 2,61verificando un estado α–mesotrófico que indica contaminación fuerte. Por lo tanto, en este estudio las diatomeas están relacionadas al índice de calidad del agua del río, ya que mientras varíen los parámetros mencionados anteriormente las mismas aumentarán o disminuirán considerablemente; pero a su vez existirán factores climáticos que alteren el estudio, tales como las precipitaciones que alteraron el nivel de clorofila en el punto 1 durante el mes de diciembre

Final Data Report: Sodus Bay Limnology, Lake Chemistry, Phytoplankton and Zooplankton Abundance and Nutrient and Soil Losses from the Watershed, 2004

During the spring, summer and fall of 2004, limnological and sub-watershed data were collected from Sodus Bay. In general, monitoring and analysis were designed to meet the following objectives: document current lake, sediment and nutrient conditions; document stream loading to the lake; characterize the bay\u27s community of phytoplankton and zooplankton to provide a benchmark against which the effectiveness of future management actions can be measured. This program will assist in developing a watershed enhancement plan and provide data for a simulation to determine the need for and likely success of adding alum to decrease phosphorus loss from the anoxic hypolimnion

The use of diatom records to establish reference conditions for UK lakes subject to eutrophication

A knowledge of pre-disturbance conditions is important for setting realistic restoration targets for lakes. For European waters this is now a requirement of the European Council Water Framework Directive where ecological status must be assessed based on the degree to which present day conditions deviate from reference conditions. Here, we employ palaeolimnological techniques, principally inferences of total phosphorus from diatom assemblages (DI-TP) and classification of diatom composition data from the time slice in sediment cores dated to similar to 1850 AD, to define chemical and ecological reference conditions, respectively, for a range of UK lake types. The DI-TP results from 169 sites indicate that reference TP values for low alkalinity lakes are typically 3 m mean depth) generally had lower reference TP concentrations than the shallow sites. A small group of shallow marl lakes had concentrations of similar to 30 mu g L-1. Cluster analysis of diatom composition data from 106 lakes where the key pressure of interest was eutrophication identified three clusters, each associated with particular lake types, suggesting that the typology has ecological relevance, although poor cross matching of the diatom groups and the lake typology at type boundaries highlights the value of a site-specific approach to defining reference conditions. Finally the floristic difference between the reference and present day (surface sample) diatom assemblages of each site was estimated using the squared chord distance dissimilarity coefficient. Only 25 of the 106 lakes experienced insignificant change and the findings indicate that eutrophication has impacted all lake types with > 50% of sites exhibiting significant floristic change. The study illustrates the role of the sediment record in determining both chemical and ecological reference conditions, and assessing deviation from the latter. Whilst restoration targets may require modification in the future to account for climate induced alterations, the long temporal perspective offered by palaeolimnology ensures that such changes are assessed against a sound baseline

New records and noteworthy data of plants, algae and fungi in SE Europe and adjacent regions, 14

This paper presents new records and noteworthy data on the following taxa in SE Europe and adjacent regions: diatom algae Cyclostephanos invisitatus, Cyclotella meduanae, and Stephanodiscus lacustris, mycorrhizal fungi Alessioporus ichnusanus and Amanita mairei, saprotrophic fungi Diaporthe oncostoma, Stropharia albonitens and Pseudomassaria chondrospora, lichenised fungus Acrocordia subglobosa, stonewort Chara connivens, mosses Buxbaumia viridis, Tortella fasciculata and Tortula protobryoides, monocots Epipactis pontica Gymnadenia frivaldii, and Orchis italica and dicots Callitriche brutia, Callitriche platycarpa and Epilobium nutans are given within SE Europe and adjacent regions