Dynamics of Common Sterna hirundo and Little Tern Sternula albifrons populations along the Sava River in North-western Croatia between 2002 and 2019

AbstractBetween 2002 and 2019, monitoring of Common Tern Sterna hirundo and Little Tern Sternula albifrons along the Sava River near Zagreb, Croatia was conducted. Natura 2000 site “Sava kod Hrušćice” was designated to protect colony at river islands, with estimated population sizes of 100–150 pairs of Common and 20 pairs of the Little Tern. Flooding of the colony caused breeding failure in several years. Common Terns moved to breed on islands in gravel pits with a total population around 150 pairs, while Little Tern did not breed after 2010. In the last few years, terns have not bred at Hrušćica and the only colony inside the Natura 2000 site is situated on a breeding platform at Siromaja gravel pit. Channelling of rivers and hydropower plants are the main threats, changing natural dynamics of water level and causing reduction of gravel sediment in rivers.

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Fish community changes due to the construction of cascade of five hydropower plants on in The Sava River river (Slovenia)

Frontiers in Marine Science ◽

10.3389/conf.fmars.2019.07.00138 ◽

2019 ◽

Vol 6 ◽

Author(s):

Daša Zabric ◽

Aljaz Jenič

Keyword(s):

Fish Community ◽

Hydropower Plants ◽

Sava River ◽

Community Changes ◽

The Sava River

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Lost Energy of Water Spilled over Hydropower Dams

Sustainability ◽

10.3390/su13169119 ◽

2021 ◽

Vol 13 (16) ◽

pp. 9119

Author(s):

Andrej Predin ◽

Matej Fike ◽

Marko Pezdevšek ◽

Gorazd Hren

Keyword(s):

Power Plants ◽

Flood Events ◽

Energy Potential ◽

Climate Conditions ◽

Hydropower Plants ◽

Hydropower Dams ◽

Sava River ◽

Analytical Assessment ◽

The Sava River

The present paper presents a view of water spilled over hydropower plants as an energy loss. In the current climate conditions, flood events are becoming more frequent due to human impact on the environment; water spills are also more frequent, which means more and more energy is lost. How much water is spilled and, consequently, how much energy is lost is shown in the present article on the chain of power plants on the Sava River in the five years from 2015 to 2019. An analytical assessment of the current situation in the lock was carried out, which showed that the available water through the locks could be used efficiently. The paper presents a case study of one overflow event lasting 48 h. The calculated theoretical losses of energy (of spilled water) and possible technical implementation for capturing losses are given. The proposed technical implementation is based on established technology, so we could expect that the approach is feasible. The results show that the estimated spilled water energy potential reaches about 40% of the actual spilled water or energy lost.

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Common Tern (Sterna hirundo)

10.2173/bna.618 ◽

2002 ◽

Cited By ~ 16

Author(s):

Ian C. T. Nisbet

Keyword(s):

Common Tern ◽

Sterna Hirundo

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Occurrence of the Green Shield-Moss Buxbaumia viridis (Moug.) Brid. in the Bieszczady Mountains of Poland

Forests ◽

10.3390/f12030374 ◽

2021 ◽

Vol 12 (3) ◽

pp. 374

Author(s):

Piotr Brewczyński ◽

Kamil Grałek ◽

Piotr Bilański

Keyword(s):

National Park ◽

Large Scale ◽

Conservation Status ◽

Natura 2000 ◽

Field Work ◽

Managed Forests ◽

Moss Species ◽

Microhabitat Preferences ◽

Natura 2000 Site ◽

Forest District

The small-sized gametophytes and sporophytes of the green shield-moss Buxbaumia viridis (Moug.) Brid. make it difficult to study. However, in Europe, there has been increasing interest in this species in the past few years, mostly as a result of the implementation of the Natura 2000 network. In Poland, B. viridis has only been reported in isolated studies that have been limited in terms of area and the number of participating workers. One of the Polish regions where B. viridis was recently recorded is the Bieszczady Mountains, but there have been no large-scale surveys of that region to date. The objective of the current work was to describe the B. viridis population in the Bieszczady Mountains in terms of its spatial distribution and abundance, investigate its selected microhabitat preferences, and evaluate the conservation status of this moss species within the Natura 2000 site Bieszczady PLC180001. The studied region encompassed 93,490.44 ha, including 69,056.23 ha of managed forests and 24,434.21 ha of forests belonging to the Bieszczady National Park. A preliminary survey was conducted in the Cisna Forest District (forest area of 19,555.82 ha) on 15–17 November 2017, while the main survey was performed in selected forest subcompartments of four forest districts—Baligród, Komańcza, Lutowiska, and Stuposiany—as well as the Bieszczady National Park from 5 to 16 November 2018. The field work consisted of searching for B. viridis sporophytes and setae and recording selected population and locality characteristics. The study led to the discovery of 353 new B. viridis localities in 202 study areas, with 9197 diploid individuals (sporophytes or setae only) growing in 545 microhabitats. The number of B. viridis localities discovered in the Bieszczady Mountains during 17 days of survey in 2017 and 2018 was two times higher than the combined number of localities previously found in Poland over more than 150 years (159 localities). Additionally, the number of sporophytes and setae identified was two times greater than their overall number in previous records. In addition, this study provides information about selected microhabitat preferences and the conservation status of this moss in the Bieszczady Natura 2000 site.

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Natura 2000 sites and fisheries in German offshore waters

ICES Journal of Marine Science ◽

10.1093/icesjms/fsn193 ◽

2008 ◽

Vol 66 (1) ◽

pp. 155-169 ◽

Cited By ~ 44

Author(s):

Søren Anker Pedersen ◽

Heino Fock ◽

Jochen Krause ◽

Christian Pusch ◽

Anne L. Sell ◽

...

Keyword(s):

Marine Mammals ◽

Fishery Management ◽

Conservation Status ◽

Natura 2000 ◽

Management Measures ◽

Favourable Conservation Status ◽

Management Plans ◽

Natura 2000 Site ◽

Environmentally Sound ◽

Fishing Impacts

Abstract Pedersen, S. A., Fock, H., Krause, J., Pusch, C., Sell, A. L., Böttcher, U., Rogers, S. I., Sköld, M., Skov, H., Podolska, M., Piet, G. J., and Rice, J. C. 2009. Natura 2000 sites and fisheries in German offshore waters.–ICES Journal of Marine Science, 66: 155–169. The principal objective of sites selected as part of Natura 2000 is to achieve or maintain a favourable conservation status of habitats and species named in the EU Birds and Habitats directives. In the German exclusive economic zone, the habitat types protected by this legislation are sandbanks and reefs; protected species include marine mammals, seabirds, and specific migratory fish species. The ICES project Environmentally Sound Fishery Management in Protected Areas (EMPAS) aims to answer two questions: (i) To what extent do specific fishing activities significantly threaten attainment of the conservation objectives of the Natura 2000 sites? (ii) What management measures would reduce these conflicts and how effective would they be at helping to ensure the favourable condition of these sites? Assessments of fishing impacts on Natura 2000 sites require basic data on the conservation status of individual habitats and species, as well as data for fine-scale distributions of ongoing fishing activities. This paper describes and discusses the process used by the EMPAS project in developing fishery-management plans for each Natura 2000 site in German offshore waters.

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Mothers under stress? Hatching sex ratio in relation to maternal baseline corticosterone in the common tern (Sterna hirundo)

Journal of Comparative Physiology A ◽

10.1007/s00359-013-0840-8 ◽

2013 ◽

Vol 199 (9) ◽

pp. 799-805 ◽

Cited By ~ 3

Author(s):

Juliane Riechert ◽

Olivier Chastel ◽

Peter H. Becker

Keyword(s):

Sex Ratio ◽

Common Tern ◽

Sterna Hirundo ◽

Baseline Corticosterone ◽

The Common

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Determination of Cd, Pb and As in sediments of the Sava river by electrothermal atomic absorption spectrometry

Journal of the Serbian Chemical Society ◽

10.2298/jsc1001113m ◽

2010 ◽

Vol 75 (1) ◽

pp. 113-128 ◽

Cited By ~ 8

Author(s):

Simona Murko ◽

Radmila Milacic ◽

Marjan Veber ◽

Janez Scancar

Keyword(s):

Nitric Acid ◽

Analytical Procedure ◽

Electrothermal Atomic Absorption Spectrometry ◽

Absorption Spectrometry ◽

Magnesium Nitrate ◽

Matrix Modifier ◽

Reliable Determination ◽

Sava River ◽

The Sava River

The applicability of nitric acid, palladium nitrate and a mixture of palladium and magnesium nitrate as matrix modifiers was estimated for the accurate and reproducible determination of cadmium (Cd), lead (Pb) and arsenic (As) in sediments of the Sava River by electrothermal atomic absorption spectrometry, ETAAS. Decomposition of the samples was done in a closed vessel microwave-assisted digestion system using nitric, hydrochloric and hydrofluoric acids, followed by the addition of boric acid to convert the fluorides into soluble complexes. The parameters for the determination of Cd, Pb and As in sediments were optimized for each individual element and for each matrix modifier. In addition, two sediment reference materials were also analyzed. In determination of Cd and Pb, nitric acid was found to be the most appropriate matrix modifier. The accurate and reliable determination of Cd and Pb in sediments was possible also in the presence of boric acid. The use of a mixture of palladium and magnesium nitrate efficiently compensated for matrix effects and enabled the accurate and reliable determination of As in the sediments. Quantification of Cd and As was performed by calibration using acid matched standard solutions, while the standard addition method was applied for the quantification of Pb. The repeatability of the analytical procedure for the determination of Cd, Pb and As in sediments was ?5 % for Cd, ?4 % for Pb and ?2 % for As. The LOD values of the analytical procedure were found to be 0.05 mg/kg for Cd and 0.25 mg/kg for Pb and As, while the LOQ values were 0.16 mg/kg for Cd and 0.83 mg/kg for Pb and As. Finally, Cd, Pb and As were successfully determined in sediments of the Sava River in Slovenia.

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