scholarly journals Plasticity in Reproductive Traits, Condition and Energy Allocation of the Non-Native Pyrenean Gudgeon Gobio lozanoi in a Highly Regulated Mediterranean River Basin

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 387
Author(s):  
Fátima Amat-Trigo ◽  
Mar Torralva ◽  
Daniel González-Silvera ◽  
Francisco Javier Martínez-López ◽  
Francisco José Oliva-Paterna
Keyword(s):  
River Basin ◽  
Reproductive Traits ◽  
Energy Allocation ◽  
Base Flow ◽  
Regulated River ◽  
High Plasticity ◽  
Fish Condition ◽  
Mediterranean River ◽  
Management Actions ◽  
Lipid Contents

The invasion success of non-native fish, such as Pyrenean gudgeon Gobio lozanoi in several Iberian rivers, is often explained by the expression of its life history traits. This study provides the first insights into the reproductive traits, fish condition, and energy allocation (protein and lipid contents of tissues) of this species, along a longitudinal gradient in one of the most regulated river basins in the Iberian Peninsula, the Segura river. Larger sizes of first maturity, higher fecundity and larger oocytes were found in fluvial sectors with the most natural flow regimes, characterised by a low base flow with high flow peaks in spring and autumn. A delay in the reproductive period, lower fish condition and no differences in sex-ratio were observed in fluvial sectors with a high increase in base flow and notable inversion in the seasonal pattern of flow regime. Lipid contents in the liver and gonads were stable during the reproductive cycle and decreases in muscle were noted, whereas ovarian and liver proteins increased. In relation to energy allocation for G. lozanoi, an intermediate energy strategy was observed between income and capital breeding. Our results support the hypothesis that the high plasticity of G. lozanoi population traits plays a significant role in its success in a highly regulated Mediterranean river basin. Understanding the mechanisms by which flow regulation shapes fish populations in Mediterranean type-rivers could inform management actions.

scholarly journals Emission factor estimation of ca. 160 emerging organic microcontaminants by inverse modeling in a Mediterranean river basin (Llobregat, NE Spain)

2015 ◽  
Vol 520 ◽  
pp. 241-252 ◽  
Author(s):  
Zoran Banjac ◽  
Antoni Ginebreda ◽  
Maja Kuzmanovic ◽  
Rafael Marcé ◽  
Martí Nadal ◽  
...  
Keyword(s):  
River Basin ◽  
Inverse Modeling ◽  
Emission Factor ◽  
Mediterranean River ◽  
Ne Spain ◽  
Factor Estimation

scholarly journals Landscape associations of globally threatened grassland birds in the Aguapey river Important Bird Area, Corrientes, Argentina

2009 ◽  
Vol 20 (1) ◽  
pp. 62-73 ◽  
Author(s):  
ADRIAN S. DI GIACOMO ◽  
PETER D. VICKERY ◽  
HERNAN CASAÑAS ◽  
OSCAR A. SPITZNAGEL ◽  
CHRISTIAN OSTROSKY ◽  
...  
Keyword(s):  
River Basin ◽  
Grassland Birds ◽  
Livestock Grazing ◽  
Tall Grass ◽  
Point Counts ◽  
Landscape Characteristics ◽  
Bird Populations ◽  
Management Actions ◽  
Land Use Plan ◽  
Near Threatened

SummaryThe Aguapey river basin in the Pampas grasslands of Argentina is the last refuge for a complete assemblage of globally threatened and Near Threatened birds. We evaluated the influence of landscape characteristics on the occurrence and abundance of six globally threatened and Near Threatened passerines. We used point counts to census birds and vegetation and quantified landscape characteristics 1,000 m from the count centres using remote sensing tools. Strange-tailed Tyrants Alectrurus risora were associated with higher percentages of tall-grass Andropogon lateralis in lowland areas. Saffron-cowled Blackbirds Xanthopsar flavus and Black-and-white Monjitas Heteroxolmis dominicana were associated with rolling landscape with wet lowland grasslands and marshes linked with dry upland grasslands. Marsh Seedeater Sporophila palustris and Chestnut Seedeater S. cinnamomea were associated with tall grasslands and marshes. Rufous-throated Seedeater S. ruficollis was not clearly associated with any type of habitat. The Aguapey grasslands are used mainly for livestock grazing and afforestation. Since 1995, approximately 50% of the original grassland habitat has been planted with exotic trees. If this trend continues, Saffron-cowled Blackbirds are likely to become extinct in the Aguapey river basin which currently supports the largest population of this species in Argentina. We recommend guidelines for establishing future reserves and wildlife management actions based on the landscape responses detected in this study. Future action should consider: maintaining connectivity between the Aguapey grasslands and the Ibera Nature Reserve, creating a protected area, designing a land use plan for the basin, avoiding afforestation in large blocks, removal of government incentives for large afforestation projects, and studying the viability of threatened bird populations in extensive cattle ranching areas.

A geomorphic approach to evaluate river recovery potential for regulated river basin

2020 ◽  
pp. 1805-1809
Author(s):  
C. Pradhan ◽  
Suresh Modalavalasa ◽  
S. Dutta ◽  
Rishikesh Bharti
Keyword(s):  
River Basin ◽  
Regulated River ◽  
Recovery Potential

scholarly journals A dynamic water accounting framework based on marginal resource opportunity cost

2015 ◽  
Vol 19 (3) ◽  
pp. 1457-1467 ◽  
Author(s):  
A. Tilmant ◽  
G. Marques ◽  
Y. Mohamed
Keyword(s):  
River Basin ◽  
Value Chain ◽  
Economic Value ◽  
River System ◽  
River Basins ◽  
Management Decision ◽  
Water Fluxes ◽  
Management Actions ◽  
Water Users ◽  
Water Accounting

Abstract. Many river basins throughout the world are increasingly under pressure as water demands keep rising due to population growth, industrialization, urbanization and rising living standards. In the past, the typical answer to meet those demands focused on the supply side and involved the construction of hydraulic infrastructures to capture more water from surface water bodies and from aquifers. As river basins have become more and more developed, downstream water users and ecosystems have become increasingly dependent on the management actions taken by upstream users. The increased interconnectedness between water users, aquatic ecosystems and the built environment is further compounded by climate change and its impact on the water cycle. Those pressures mean that it has become increasingly important to measure and account for changes in water fluxes and their corresponding economic value as they progress throughout the river system. Such basin water accounting should provide policy makers with important information regarding the relative contribution of each water user, infrastructure and management decision to the overall economic value of the river basin. This paper presents a dynamic water accounting approach whereby the entire river basin is considered as a value chain with multiple services including production and storage. Water users and reservoir operators are considered as economic agents who can exchange water with their hydraulic neighbors at a price corresponding to the marginal value of water. Effective water accounting is made possible by keeping track of all water fluxes and their corresponding hypothetical transactions using the results of a hydro-economic model. The proposed approach is illustrated with the Eastern Nile River basin in Africa.

Application of Methodologies for Environmental Flow Determination in an Andean and a Mediterranean Basin

2013 ◽  
pp. 296-314
Author(s):  
Yesid Carvajal-Escobar ◽  
Ziad Mimi ◽  
Saed Khayat ◽  
Saleh Sulieman ◽  
Wilson Garces ◽  
...  
Keyword(s):  
Mediterranean Basin ◽  
Significant Variation ◽  
Environmental Flows ◽  
Environmental Flow ◽  
Base Flow ◽  
Point Sources ◽  
Local Context ◽  
Mediterranean River ◽  
Hydrological Indices ◽  
Hydrological Parameter

The demand for sustainable water management has promoted the development of methodologies for estimating environmental flows (EF). In this paper, the EF in an Andean river (Pance, Colombia) for conservation and a Mediterranean river (Wadi-Zomar, Palestine) for restoration purposes is made. Different methodologies are applied given the objectives for each river. The authors used hydrological indices proposed for watersheds with different water regimes and adaptations and validations were made to the local context. These methods allow for estimating the EF at various points in the river and the assessment of disruption scenarios for decision-making. In the Wadi Zomar River, three sampling points were selected. The water samples were then examined for the presence of pathogens. No one indicator or simple hydrological parameter is entirely suitable for all environmental systems and pathogens. In the base flow conditions, the amount of pollutant load varied temporally according to the amount of load from point sources along the Wadi, and spatially with distance from the same sources. Significant variation was observed in response to the hydrological behavior of the catchment. The assessment for the water quality in the Zomar reflects a potentially serious threat to the environment. The results emphasize the need for regulating the seepage effluent from industries and sewage system along the stream.

scholarly journals Effects of Opened and Closed Spillway Operations of a Large Tropical Hydroelectric Dam on the Water Quality of the Downstream River

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Fiona-Annilow Wera ◽  
Teck-Yee Ling ◽  
Lee Nyanti ◽  
Siong-Fong Sim ◽  
Jongkar Grinang
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Aquatic Organisms ◽  
Quality Parameters ◽  
Regulated River ◽  
Land Uses ◽  
Hydroelectric Dam ◽  
Water Ph ◽  
The Impact

Water quality downstream of a hydroelectric dam is potentially affected by dam operations and other land uses in the river basin. Previous short-distance studies below the large Bakun Dam indicated poorer water quality during closed spillway. However, the extent of the impact is still unknown. Such knowledge is essential for mitigating the impact of the dam. Thus, the objectives of this study were to determine the water quality up to a distance of 210 km under two spillway operations, namely, closed and opened spillways, and also to determine the changes in water quality from the predam condition. Physicochemical parameters were measured at 15 stations along the Rajang River. Results of this preliminary study indicated that there were significant differences in eight out of nine water quality parameters between opened and closed spillway operations with opened spillway showing better water quality. During closed spillway, as we approached the dam, there was an increasing acidity and a decreasing oxygen content. Furthermore, as the water flows downstream, the unhealthy DO level (<5 mg/L) extended up to 165 km and the linear model showed an increasing DO rate of 0.09 mg/L per km. With opened spillway, DO decreased exponentially from 9.74 mg/L towards the downstream direction to 7.67 mg/L. The increasing turbidity and TSS in the downstream direction indicate contributions from erosion due to other land uses. The river is polluted with organics as indicated by COD of Class IV or V with sources from the dam and the activities in the river basin. Compared to the predam condition, the regulated river is less turbid but warmer and higher in ammonia. Closed spillway led to lower DO and acidic water. However, opened spillway water pH and DO were similar to those in the predam condition. Thus, it is recommended that DO be consistently high enough for the health of sensitive aquatic organisms downstream.

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