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1
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Context-dependent consequences of Marenzelleria spp. (Spionidae: Polychaeta) invasion for nutrient cycling in the Northern Baltic Sea

100%
Maximov A., Bonsdorff E., Eremina T., Kauppi L., Norkko A., Norkko J.
Oceanologia
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2015
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tom 57
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nr 4
2
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Significance of nutrient fluxes via submarine groundwater discharge in the Bay of Puck, Southern Baltic Sea

100%
Szymczycha B., Klostowska Z., Lengier M., Dzierzbicka-Glowacka L.
Oceanologia
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2020
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tom 62
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nr 2
3
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Nutrient flux fuels the summer primary productivity in the oligotrophic waters of the Gulf of Aqaba, Red Sea

100%
Badran M. I., Rasheed M., Manasrah R., Al-Najjar T.
Oceanologia
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2005
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tom 47
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nr 1
The thermohaline characteristics of the Gulf of Aqaba, Red Sea, depict a welldefined seasonal pattern of winter mixing from December to April and summer stratification from May to November. This thermohaline structure is a major controlling factor of the nutrient, chlorophyll a and primary productivity seasonal cycles. The nitrate and chlorophyll a concentration records generated down to 200 m at a vertical resolution of 25 m – weekly during 1994, 1995 and every two weeks from April 1997 through to December 2000 – are employed to assess the nitrogen flux across the summer thermocline of the Gulf of Aqaba. The flux calculations are based on a simple diffusion model that incorporates the physical stress eddy diffusivity factor Kz and a biological stress factor k. Both Kz and k are calculated using the Michaelis-Menten equation and the nitrate concentration gradient. The total nitrate flux of the Gulf of Aqaba during the seven summer months (May–November) is estimated at 0.52 moleN m−2. In relation to established primary productivity values (75.5 gC m−2 (May November)−1) and the generated chlorophyll a records, this yields an f fraction of new to total primary production of 0.50. This relatively high f value is discussed with respect to the geophysical characteristics of the Gulf of Aqaba and similar oceanic basins. The remaining 50% is accounted for by cross-sectional flow from the relatively nutrientrich coral reef coastal habitat and rapid recycling, triggered by high irradiance and water temperature.
4

Growth and nutrition of restored Quercus castaneifolia C.A. Mey. versus native Celtis australis L. tree species: conservation perspectives of Hyrcanian forest (Iran)

80%
Hosseini S. M., Raouhi-Moghaddam E., Ebrahimi E., Rahmani A., Tabari M.
Polish Journal of Ecology
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2010
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tom 58
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nr 1
For native species, mixed plantation systems seem to be the most appropriate for providing a broader range of options such as production, protection, biodiversity conservation and restoration. After 11 years, growth and nutrition and soil properties were examined in young plantation of two indigenous tree species in Hyrcanian forests of Iran. Quercus castaneifolia C.A. Mey. (as target species) and Celtis australis L. (as native component species) were planted in five proportions (100Q, 70Q:30C, 60Q:40C, 50Q:50C, 40Q:60C) in Noor, Iran. Diameter at breast height of individual Quercus trees and total basal area were affected by the presence of Celtis. Percent retranslocation of nutrients in Quercus followed in order: K> P> N. Leaf-litter fall production ranged from 4.10 to 6.14 t ha⁻¹ year⁻¹. Ca and Mg concentrations in fully expanded leaves of Quercus, N and K retranslocation of Quercus, concentration of available P in soil were higher in some of the mixed plantations than in monoculture of Quercus. On the other hand, N concentration in fully expanded leaves of Quercus, N fluxes and soil C/N ratio were higher in monoculture of Quercus. Within the framework of this experiment, it appeared that production was maximized when these two species were grown together in the proportion of 60% Quercus and 40% Celtis.
5

The behavior and dynamics of some dominant herbaceous plants of Swiss deciduous forests

80%
Klotzli F., Walther G. R.
Fragmenta Floristica et Geobotanica
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2000
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tom 45
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nr 1-2
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