International Review of Hydrobiology最新文献

Understanding the effects of changes in land use patterns in the catchment area on water quality is crucial for effectively protecting aquatic resources. As transition zones between freshwater and the marine realm, Lagoon systems are especially vulnerable to anthropogenic influence due to their limited water exchange and challenging salinity regimes. To assess the environmental consequences of land use changes on water quality parameters under subtropical African conditions, 12 sites in Lagos Lagoon were sampled monthly over an entire year, covering the wet and dry seasons. The relationships between land use patterns and water quality were studied by combining seasonal water analysis results with GIS mapping based on satellite images. The results of the monthly water analysis showed a large degree of seasonality effects on almost all parameters but also some site-specific features pointing to local dominance of catchment area-related impacts. To unravel them, correlations between water parameters and land use patterns were analyzed based on a rough but robust classification. The land use forms were divided into five categories: waterbody, bare land, forest, urban area, and wetland. Independent of the restricted range of land use pattern variability covered by this study, several significant correlations between land use form and water quality parameters were found. Most of them are exclusively restricted to either the wet or dry season. Consistent season-independent significant correlations were found between the percentage of urban area and dissolved oxygen concentration. For wetlands, such consistent and significant correlations were found with nitrate, chemical oxygen demand, and turbidity. The findings provide first insights into the impact of land use changes on lagoon water quality under subtropical biodiversity of these systems and aquatic resources in general.

Introduction: in Lubumbashi, as in upscale areas where explorations of fertility are very clever, the spermogram remains the essential analysis in the diagnosis of male infertility. This is the cause of 40% of couple infertility. The spermogram is the first step in identifying seminal abnormalities. The objective of this study was to determine the epidemiological-clinical and seminal profile of the man consulting for the desire to procreate in Lubumbashi.

Methods: this was a cross-sectional study. We received 202 subjects in Lubumbashi, whose spermogram was performed from August 1^st, 2020 to July 31^st, 2021. The semen parameters were studied and interpreted according to WHO standards (2010) with studies of factors associated with their disturbance. Bivariate and multivariate analyzes had been carried out. The statistical significance threshold was set at p < 0.05.

Results: the epidemiological-clinical profile of the respondents was as follows: the most represented age group was 30 to 39 years; infertility was primary in 80.69% of cases; the duration of the desire for paternity was 2 years at most in 44.55% of cases. The sperm abnormalities found were: oligozoospermia (40.09%), azoospermia (11.38%), asthenozoospermia (18.31%) and teratozoospermia (10.39%). Oligozoospermia was significantly associated with varicocele (ORa = 10.9 [3.0-39.5]; p < 0.0001), genital infection (ORa =2.7 [1.0-7, 2]; p = 0.041) and obesity (ORa = 2.6 [1.0-7.9]; p = 0.020) while azoospermia was the cure for inguinal hernia (ORa = 4.2 [1.0-17.2]; p = 0.049) and malnutrition (ORa =6.0 [1.2-29.7]; p = 0.027). Asthenozoospermia was significantly associated with the age group of 40 to 49 years (ORa = 6.6 [1.2-37.4]; p = 0.034), tobacco (ORa =7.5 [2.7 -21.0]; p = 0.000), undernutrition (ORa = 7.7 [1.0-61.9]; p = 0.045) and overweight (ORa =3.8 [1.3-11, 5]; p=0.019). Teratozoospermia was significantly associated with smoking (ORa = 5.6 [1.8-17.7]; p = 0.003) and overweight (ORa =5.3 [1.2-23.3]; p = 0.027).

Conclusion: more than half of the respondents had, of the three main fertility parameters, at least one that was disturbed. Sperm count was the most affected parameter. Alcohol, tobacco, genital infection and malnutrition were the most common risk factors for the abnormalities observed.

Healthy populations of salmonids are integral for the functioning of ecosystems and a valuable part of sociocultural identities. Past declines were attributed to anthropogenic stressors, raising concern about the sustainability of populations. Accordingly, many salmonids are listed on red lists and protected by national legislation. One region where salmonid populations are threatened is Northern Spain, the most southern distribution of both the Atlantic salmon (protected under the EU Habitat Directive) and the brown trout. Here, we collated ~700 biomonitoring samples of both species collected across 177 sites over a 10-year period (2010–2019) to describe ongoing trends in these species and to relate them to site characteristics and potential drivers which may modulate these trends. We showed that both species have declined substantially, with stocked individuals constituting the majority of both populations. Natural reproduction was almost entirely absent for the brown trout (<1%), but present in the Atlantic salmon (~20%). Both species expressed distinct spatial patterns, likely related to their stocking and habitat preferences. As a result, we not only underline alarming conditions of both species, but also question the effectiveness of currently employed stocking efforts. Given that both species are of increasing conservation concern, river basin-specific analyses are required to identify limiting factors on which conservation actions can be taken. In the evaluated river systems, identified targets include dam removal and pollution reduction, concomitant to the implementation of more effective stocking practices to reduce dependency and maximise conservation benefits for aquatic populations.

Human activities, including the mining industry, have considerably degraded water habitats worldwide. Acidification has severely affected aquatic environments and biodiversity by altering food webs and reducing species richness. The study area in southern Poland is unique in addressing the effects of mining-related acidification on biodiversity in freshwater ecosystems along a broad pH gradient (2.4–9.6) in mining lakes. Study was designed to test for effect of human induced acidification. Using multivariate ordination techniques, we analyzed how variations in invertebrate composition are related to environmental factors. The results indicated that pH, hardness, total dissolved solids, and the content of ammonia and calcium were significantly associated with the distribution of invertebrates in the studied mining lakes. The highest iron content, relatively high values of conductivity, and chlorides were found in the extremely acidic mining lakes. A clear trend in decreasing density with decreasing pH was observed for taxa such as Oligochaeta, Chironomidae, Glossiphonidae, and certain taxa of snails. However, the density of other taxa such as Lestidae, Libellulidae, Caenidae, Sialidae, Helodidae, Hydrophilidae, and Polycentropodidae increased with decreasing pH. Specific communities were found with increasing acidity. Therefore, a further increase in acidity will probably cause a stronger decline in most of taxa and their density, and on water chemistry (e.g., calcium concentration, nitrites, and hardness). The data yielded offer an opportunity to fill knowledge gaps on acidic stress concerning less-studied environments such as mining lakes and link environmental pollution with communities, which is especially important, because aquatic forest habitats are especially exposed to different climatic factors and threats.