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Ecological Dynamics in the Kinneret Littoral Ecosystem

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Open Journal of Modern Hydrology 2017年第2期7卷 125-140页

作者： moshe Gophen Migal-Scientific Research Institute Kiryat Shmone Israel

A study of the Kinneret Littoral ecosystem is presented. Environmental parameters were integrated, aimed at evaluation of the Littoral ecosystem functioning: Water Level Fluctuations Index (WLFI), commercial fish landings with respect to stock assessment, fingerling food sources and density distribution, the beach vegetation impact, spawning intensity of nest builder-mouth breeder tilapias. It is concluded that WLFI is not affecting reproduction whilst long-term low WL altitude reduces the intensity of nesting by Sarotherodon galilaeus and Tristramella simonis simonis. Low WL did not affect reproduction of Coptodon zillii (Syn. Tilapia zillii). Density of fingerlings was not correlated with Inundated Beach vegetation during WL decline. Nevertheless, submerged macrophytes and shadowing Tamarix trees were preferably utilized by fingerling shoals as documented in the north-eastern half open lagoons of the lake shallows (Beteicha).

关键词： Kinneret Littoral Tilapias Water Level Vegetation

The Impact of Turbidity on Zooplankton Densities in Lake Kinneret (Israel)

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Open Journal of Modern Hydrology 2015年第4期5卷 87-94页

作者： moshe Gophen Migal Scientific Research Institute Kiryat Shmone Israel

Spatial survey of zooplankton community composition within the upper 10 m layer in Lake Kinneret was carried out. Samples were collected by plankton net (63 μ mesh size) and counted organisms were sorted by 2 groups: 1) Large-including Copepodite and adult Cyclopoid copepods and Cladocerans;2) Small nauplii and rotifers. It was found that in the northern part of the lake where turbidity is high, the density of small organisms is relatively lower, and in other parts of the lake where water is less turbid, large organisms are relatively less abundant. Speculative assumption about the impact of fish feeding behavior on that is presented.

关键词： Lake Kinneret Zooplankton Spatial Distribution

The Impact of Nitrogen and Phosphorus Dynamics on the Kinneret Phytoplankton: II: Chlorophyta, Cyanophyta, Diatoms and Peridinium

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Open Journal of Modern Hydrology 2017年第4期7卷 298-313页

作者： moshe Gophen Migal-Galilee Scientific Research Institute Kiryat Shmona Israel

Lake Kinneret long-term data of the epilimnetic concentrations (ppm) and loads (tones) of the total Nitrogen (TN), total Phosphorus (TP), total inorganic Nitrogen (TIN), total Dissolved Phosphorus (TDP), Phytoplankton groups’ biomass, water level (WL) and Jordan River Discharge were analyzed. Previously collected data compiled aimed at an insight into the causative background for the modification of Phytoplankton community change. The study was carried out by searching for relations between algal groups’ densities and nutrient conditions in the Epilimnion by the use of statistical methods (Simple and Fractional Polynomial Regressions). The study is aimed at analyzing the relations between algal biomass and nutrient contents. It was found that Nitrogen decline and slight increase of phosphorus were followed by Peridinium (Photo 1)?decline and biomass increase of non-peridinium algae. It is suggested that nitrogen supply for algal growth is mostly from external sources, and the reduction of nitrogen in the epilimnion was caused by external removal. Contrary to nitrogen, phosphorus sourcing is only partly external (dust deposition, drainage basin) and mostly internal through double channels: Microbial mineralization of bottom sediments and Peridinium cysts mediation. The resulted complexity of the Kinneret ecosystem structure is nitrogen limitation, and enhancement of Non-peridinium algal growth, mostly Cyanobacteria.

关键词： Chlorophyta Diatoms Cyanobacteria Nitrogen Phosphorus Kinneret

Covered nitinol stents for the treatment of esophageal strictures and leaks

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World Journal of Gastroenterology 2010年第18期16卷 2260-2264页

作者： Davide Bona Letizia Laface Luigi Bonavina Emmanuele Abate moshe Schaffer Ippazio Ugenti Stefano Siboni Rosaria Carrinola Department of Medical and Surgical Sciences Division of General SurgeryIRCCS Policlinico San DonatoUniversity of Milan Medical School

AIM:To compare 2 different types of covered esophageal nitinol stents(Ultraflex and Choostent) in terms of efficacy,complications,and long-term ***:A retrospective review of a consecutive series of 65 patients who underwent endoscopic placement of an Ultraflex stent(n = 33) or a Choostent(n = 32) from June 2001 to October 2009 was ***:Stent placement was successful in all patients without hospital *** significant differences in patient discomfort and complications were observed between the Ultraflex stent and Choostent *** median follow-up time was 6 mo(interquartile range 3-16 mo).Endoscopic reintervention was required in 9 patients(14%) because of stent migration or food *** significant difference in the rate of reintervention between the 2 groups was observed(P = 0.8).The mean dysphagia score 1 mo after stent placement was 1.9 ± 0.3 for the Ultraflex stent and 2.1 ± 0.4 for the Choostent(P = 0.6).At 1-mo follow-up endoscopy,the cover membrane of the stent appeared to be damaged more frequently in the Choostent group(P = 0.34).Removal of the Choostent was possible up to 8 wk without ***:Ultraflex and Choostent proved to be equally reliable for palliation of dysphagia and *** of the Choostent was easy and safe under mild sedation.

关键词： Dysphagia Esophageal neoplasms Endoscopy Palliative care Surgical anastomosis Stricture Neoadjuvant therapy Self-expanding metal stents

Partnerships between the Managements of Cranes (Grus grus) and Kinneret Water Quality Protection in the Hula Valley, Israel

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Open Journal of Modern Hydrology 2017年第2期7卷 200-208页

作者： moshe Gophen Migal Scientific Research Institute Kiryat Shmone Israel

The historical habitat of swamps and a lake in the Hula Valley was modified during the early 1950’s. The Swamps and the old Hula Lake were drained and the land was converted to an agricultural development. As a result of inappropriate cultivation, it was necessary to once more implement management improvement. It was done within the Hula Project. Part of the Hula Project was a modified usage of 10% of the area previously used for agriculture for eco-tourism. Independently, thousands of migratory Cranes attracted by peanut crop leftover started wintering in the valley. These bird flocks significantly improved the management objective to ensure prevention of nutrient flux into Lake Kinneret. Consequently, the partnerships between Kinneret water quality protection, nature conservation and agricultural utilization of the peat land is presently operated. Migratory wintered Cranes is a factor of management stability accompanied by costly artificial feeding for bird in a dedicated land block to prevent damage to adjacent crops.

关键词： Cranes Hula Kinneret Nutrients Water Quality

Temperature Impact on the Shannon-Wiener Biodiversity Index (BDI) of Zooplankton in Lake Kinneret (Israel)

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Open Journal of Modern Hydrology 2018年第2期8卷 39-49页

作者： moshe Gophen MIGAL-Scientific Research Institute Kiryat Shmona Israel

The Shannon-Wiener Biodiversity Index was implemented for Zooplankton Diversity (BDI) in Lake Kinneret (1970-2001). It was computed based on monthly mean densities in relation to Epilimnetic temperatures. 4, 5 and 9 species of Copepoda, Cladocera and Rotifera, respectively, were included. Direct relations between Epilimnetic temperatures and Zooplankton Bio-Diversity Indexes (BDI) were indicated: Matching was found between low BDI and the high summer temperature and between higher BDI and the low winter temperature as well. Similar correspondence did not indicate annual means of BDI values. Zooplankton density and temperature probably resulted from smoothed confound of the averaged temperature changes. Conclusively, in themonomicticLakeKinneret located in the temperate zone with a high degree of temperature fluctuation, causation of seasonal BDI fluctuations is possible. The consistence of global warming trend might, therefore, enhance the seasonality of BDI values changes with implications for water quality.

关键词： Shannon Index Biodiversity Zooplankton Temperature Kinneret

Experimental Study of the Feeding Habits of Tilapia zillii(Gervais) in Lake Kinneret

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Open Journal of Modern Hydrology 2017年第1期7卷 1-10页

作者： moshe Gophen Migal Scientific Research Institute Kiryat Shmone Israel

The feeding habits of the cichlid Tilapia zillii (Gervais) in Lake Kinneret (Israel) were experimentally studied in indoor glass containers (2.5 hrs) and two trials in outdoor 5 m3 tanks (20 - 25 days). The trait of food particle collection by adult fishes was measured. A survey was carried out in the littoral (0 - 1.0 m deep) zone and fingerlings were sampled by electro-chocker. The gut content of the fingerlings was analyzed. The feeding habits of T. zillii were indicated as planktivorous filtration with more enhancements of small zooplankters (Nauplius, Brachionid rotifers) and fewer of Cladocerans suppressions.

关键词： Tilapia zillii Kinneret Feeding Ecological Adaptation

Atmospheric CO2Increase: A Potential for Primary Production Enhancement in Lake Kinneret

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Open Journal of Modern Hydrology 2018年第2期8卷 50-65页

作者： moshe Gophen Migal-Scientific Research Institute Kiryat Shmone Israeli

Due to precipitation reduction, nutrient inputs into Lake Kinneret through Jordan river discharge declined. Nitrogen (N) supply into the Kinneret ecosystem is mostly external and that of Phosphorus (P) is partly internal and dust deposition. Therefore, decline of N and slight elevation of P concentrations occurred in the Kinneret Epilimnion. As a result, suppression of Peridinium biomass and enhancement of Cyanophyta, Chlorophyta and Diatoms were recorded. The Peridinium decline caused Primary Production (PP) reduction and although increased later, it accompanied the nano-plankton elevation. It is suggested that the PP enhancement is partly due to the natural photosynthetic capacity of nano-plankton and partly to global increase of atmospheric concentration of CO2. The suggestion of atmospheric CO2 increase and consequently PP, was supported by the pH (and obviously Alkalinity) increase. The enhancement of CO2 diffusion was an incentive factor which enhanced PP capacity.

关键词： Kinneret CO2 pH Primary Production Eutrophication

The Impact of Available Nitrogen Deficiency on Long-Term Changes in the Lake Kinneret Ecosystem

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Open Journal of Ecology 2015年第4期5卷 147-157页

作者： moshe Gophen Migal-Scientific Research Institute Kiryat Shmone Israel

Lake Kinneret Ecosystem structure has undergone significant modification since early 1990s. Scientists have indicated several causative factors for those long-term changes. The sharp decline of Peridinium and the upset of Cyanobacteria are the major changes. Several options were suggested as the reason for those changes. Among others are the followings: high amplitude of water level fluctuations, global warming, fisheries management, salts diversion, onset and offset of beach vegetation, anthropogenic operations in the drainage basin, allelopathic trait of algal competition, etc. It was suggested that the reduction of ammonia supply from the Hula Valley resulted in the conversion of the land from lake and swamps covered to agriculture followed by elimination of treated domestic sewage and fishponds effluents enhanced deficiency of available N in Lake Kinneret. This paper evaluates the impact of available Nitrogen decline which enhanced Kinneret ecosystem modifications.

关键词： Kinneret Peridinium Ammonia Hula Valley