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Journal articles on the topic 'Lake ecology'
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1
Blanchette, Melanie L., Richard Allcock, Jahir Gonzalez, Nina Kresoje, and Mark Lund. "Macroinvertebrates and Microbes (Archaea, Bacteria) Offer Complementary Insights into Mine-Pit Lake Ecology." Mine Water and the Environment 39, no. 3 (November 8, 2019): 589–602. http://dx.doi.org/10.1007/s10230-019-00647-9.
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Abstract The broad objective of this research was to determine the environmental drivers of macroinvertebrate and microbial assemblages in acidic pit lakes. This is important because pit lake ecosystem development is influenced by prevailing environmental characteristics. Three lakes (Stockton, Kepwari, WO5H) within a larger pit-lake district in Collie, Western Australia were surveyed for spatial variability of benthic macroinvertebrate and microbe (Archaea, Bacteria) assemblage composition as well as potential environmental drivers (riparian condition, aquatic habitat, sediments, and aquatic chemistry) of assemblages. With the exception of sediment chemistry, biophysical variables were significantly different across lakes and reflected riparian condition and groundwater chemistry. Microbial assemblages in pit lakes were significantly different across lakes and correlated with water chemistry, particularly metals in Lake WO5H. However, the most abundant microbes were not readily identified beyond class, making it difficult to speculate on their ecological function. Macroinvertebrate assemblage composition and species richness were also significantly different across all lakes, and in Lake WO5H (a lake with low pH and high metal concentrations), taxa were correlated with benthic organic matter as well as water chemistry. Results indicated that despite poor water quality, input of nutrients from terrestrial leaf litter can support or augment pit lake ecosystems. This is a demonstration of the concept that connection of pit lakes to catchments can positively affect aquatic ecosystems, which can inform management actions for remediation.
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Wen, Chao, Qingming Zhan, De Zhan, Huang Zhao, and Chen Yang. "Spatiotemporal Evolution of Lakes under Rapid Urbanization: A Case Study in Wuhan, China." Water 13, no. 9 (April 23, 2021): 1171. http://dx.doi.org/10.3390/w13091171.
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The impact of urbanization on lakes in the urban context has aroused continuous attention from the public. However, the long-term evolution of lakes in a certain megacity and the heterogeneity of the spatial relationship between related influencing factors and lake changes are rarely discussed. The evolution of 58 lakes in Wuhan, China from 1990 to 2019 was analyzed from three aspects of lake area, lake landscape, and lakefront ecology, respectively. The Multi-Scale Geographic Weighted Regression model (MGWR) was then used to analyze the impact of related influencing factors on lake area change. The investigation found that the total area of 58 lakes decreased by 15.3%. A worsening trend was found regarding lake landscape with the five landscape indexes of lakes dropping; in contrast, lakefront ecology saw a gradual recovery with variations in the remote sensing ecological index (RSEI) in the lakefront area. The MGWR regression results showed that, on the whole, the increase in Gross Domestic Product (GDP), RSEI in the lakefront area, precipitation, and humidity contributed to lake restoration. The growth of population and the proportion of impervious surface (IS) in the lakefront area had different effects on different lakes. Specifically, the increase in GDP and population in all downtown districts and two suburb districts promoted lake restoration (e.g., Wu Lake), while the increase in population in Jiangxia led to lake loss. The growth of RSEI in lakefront area promoted the restoration of most lakes. A higher proportion of IS in lakefront area normally resulted in more lake loss. However, in some cases, the growth of IS was caused by lake conservation, which contributed to lake restoration (e.g., Tangxun Lake). The study reveals the spatiotemporal evolution of multiple lakes in Wuhan and provides a useful reference for the government to formulate differentiated protection policies.
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Newton, Ryan J., Stuart E. Jones, Matthew R. Helmus, and Katherine D. McMahon. "Phylogenetic Ecology of the Freshwater Actinobacteria acI Lineage." Applied and Environmental Microbiology 73, no. 22 (September 7, 2007): 7169–76. http://dx.doi.org/10.1128/aem.00794-07.
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ABSTRACT The acI lineage of freshwater Actinobacteria is a cosmopolitan and often numerically dominant member of lake bacterial communities. We conducted a survey of acI 16S rRNA genes and 16S-23S rRNA internal transcribed spacer regions from 18 Wisconsin lakes and used standard nonphylogenetic and phylogenetic statistical approaches to investigate the factors that determine acI community composition at the local scale (within lakes) and at the regional scale (across lakes). Phylogenetic reconstruction of 434 acI 16S rRNA genes revealed a well-defined and highly resolved phylogeny. Eleven previously unrecognized monophyletic clades, each with ≥97.9% within-clade 16S rRNA gene sequence identity, were identified. Clade community similarity positively correlated with lake environmental similarity but not with geographic distance, implying that the lakes represent a single biotic region containing environmental filters for communities that have similar compositions. Phylogenetically disparate clades within the acI lineage were most abundant at the regional scale, and local communities were comprised of more closely related clades. Lake pH was a strong predictor of the community composition, but only when lakes with a pH below 6 were included in the data set. In the remaining lakes (pH above 6) biogeographic patterns in the landscape were instead a predictor of the observed acI community structure. The nonrandom distribution of the newly defined acI clades suggests potential ecophysiological differences between the clades, with acI clades AI, BII, and BIII preferring acidic lakes and acI clades AII, AVI, and BI preferring more alkaline lakes.
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Beliaev, P. Yu, A. E. Rybalko, and D. A. Subetto. "Quaternary and geomorphological features of Lake Onego. Comparison with Lake Ladoga." Limnology and Freshwater Biology, no. 4 (2022): 1385–87. http://dx.doi.org/10.31951/2658-3518-2022-a-4-1385.
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Abstract. Lake Onego is a very important source of fresh water and traffic artery of Russian NW. In addition, it is a very significant source of paleogeographical and Quaternary geological information. Studies of geology, geomorphology, paleolimnology and ecology of Onego and Ladoga lakes are being conducted since 19th century by different institutes and research companies. At the modern stage of limnological research the most significant research centers are: Saint-Petersburg state university, Moscow state university, Limnological institute RAS, Northern Water problem institute RAS, PMGRE, VSEGEI, VNII Ocengeologia, and a lot of organizations with geology, ecology, limnology and hydrology specializations with Russian and foreign researchers. This article was written based on the results of field works conducted in 2014 - 2020. The article aimed to update the stratigraphy of Quaternary deposits of the Lake Onego bottom; describe bottom sediments and relief of Lake Onego; highlight stages of the Lake Onego bottom development according to geological and geomorphological features; compare Onego and Ladoga lakes bottom sediments and relief.
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Perales, K. Martin, Catherine L. Hein, Noah R. Lottig, and M. Jake Vander Zanden. "Lake water level response to drought in a lake-rich region explained by lake and landscape characteristics." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 11 (November 2020): 1836–45. http://dx.doi.org/10.1139/cjfas-2019-0270.
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Climate change is altering hydrologic regimes, with implications for lake water levels. While lakes within lake districts experience the same climate, lakes may exhibit differential climate vulnerability regarding water level response to drought. We took advantage of a recent drought (∼2005–2010) and estimated changes in lake area, water level, and shoreline position on 47 lakes in northern Wisconsin using high-resolution orthoimagery and hypsographic curves. We developed a model predicting water level response to drought to identify characteristics of the most vulnerable lakes in the region, which indicated that low-conductivity seepage lakes found high in the landscape, with little surrounding wetland and highly permeable soils, showed the greatest water level declines. To explore potential changes in the littoral zone, we estimated coarse woody habitat (CWH) loss during the drought and found that drainage lakes lost 0.8% CWH while seepage lakes were disproportionately impacted, with a mean loss of 40% CWH. Characterizing how lakes and lake districts respond to drought will further our understanding of how climate change may alter lake ecology via water level fluctuations.
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Huebner, J. D., D. F. Malley, and K. Donkersloot. "Population ecology of the freshwater mussel Anodonta grandis grandis in a Precambrian Shield lake." Canadian Journal of Zoology 68, no. 9 (September 1, 1990): 1931–41. http://dx.doi.org/10.1139/z90-272.
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Anodonta grandis grandis is found in about half of 50 Experimental Lakes Area lakes surveyed but is abundant in only some of these lakes, including lake 377. Lake 377 is a typical small Precambrian Shield lake, 27.7 ha in area and 17.9 m in maximum depth, with [Ca2+] of [Formula: see text], conductivity of 25 μmho∙cm−1 (1 mho = 1 S), and alkalinity of [Formula: see text]. The water renewal time of approximately 187 days is shorter than that of most Precambrian Shield lakes. Bottom sediments in the sublittoral zone ranged from fine sand through granules to cobbles and boulders. Several species of possible glochidial host fish including yellow perch were collected from lake 377. The size of the mussel population, estimated by depth-stratified random sampling, was 36 800 ± 12 000 (± 95% confidence interval). Mean density was 0.133 mussels/m2 lake surface, and maximum density was 4.3 mussels/m2. Mussels were most abundant in the 1.5- to 3.1-m depth stratum. Mean lengths and weights in collections ranged from 77 to 87 mm and from 43 to 56 g, respectively. Maximum length and weight were 117.9 mm and 109.6 g, respectively. Based on external annuli, mussels live to 15+ years in lake 377. Flesh and shell averaged 25.1 and 23.2% of live weight, respectively. Calcium constituted 44.7% of the ash weight of shell. We estimated a standing dry weight biomass of mussels of 330–390 mg∙m−2 and dry weight production of 60 mg∙m−2∙year−1. This is [Formula: see text] of the estimated annual dry weight algal production. The shells of live mussels contain [Formula: see text] of the total calcium in lake 377. Despite oligotrophic conditions and low [Ca2+], lake 377 supports a substantial population of A. g. grandis growing at a moderate rate. Lake 377 may be a favourable habitat for this species because of its short water-turnover time.
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Yang, Guishan, Qi Zhang, Rongrong Wan, Xijun Lai, Xia Jiang, Ling Li, Huichao Dai, Guangchun Lei, Jianchi Chen, and Yongjun Lu. "Lake hydrology, water quality and ecology impacts of altered river–lake interactions: advances in research on the middle Yangtze river." Hydrology Research 47, S1 (November 21, 2016): 1–7. http://dx.doi.org/10.2166/nh.2016.003.
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Water and mass exchange between rivers and lakes are key processes that maintain the health of the ecology of river–lake systems. Alteration to river–lake interactions have great impacts on water and mass balances. Naturally connected to the middle Yangtze River are the Poyang Lake and Dongting Lake, which are the largest and the second largest freshwater lakes in China. The operation of the Three Gorges Dam (TGD) in the upper Yangtze River was found to have substantial impacts on the middle Yangtze river–lake system. In the past decade, unusual seasonal dryness was evident in the two lakes. Considerable deviations in lake water quality and wetland ecosystem were also detected. In order to explore and distinguish the causal factors influencing the river–lake system, the Ministry of Sciences and Technology (China) launched a research project in 2012, the National Basic Research Program of China (973 Program) (2012CB417000). This article provides an overview of advances in this research, including the evolution of the river–lake interactions, the impacts of the TGD, and the influences on lake hydrology, water quality, and ecosystem. The 20 papers in this issue deliver part of the research outcomes of this project.
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Hampton, Stephanie E., Aaron W. E. Galloway, Stephen M. Powers, Ted Ozersky, Kara H. Woo, Ryan D. Batt, Stephanie G. Labou, et al. "Ecology under lake ice." Ecology Letters 20, no. 1 (November 27, 2016): 98–111. http://dx.doi.org/10.1111/ele.12699.
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Beamish, R. J., and J. Wade. "Critical Habitat and the Conservation Ecology of the Freshwater Parasitic Lamprey, Lampetra macrostoma." Canadian Field-Naturalist 122, no. 4 (October 1, 2008): 327. http://dx.doi.org/10.22621/cfn.v122i4.640.
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Lampetra macrostoma, the Cowichan Lamprey, is a freshwater parasitic lamprey that probably evolved from L. tridentata within the last 10 000 years. It is unique to the Cowichan Lake watershed on Vancouver Island, British Columbia, Canada. Larval rearing in Mesachie and Cowichan lakes occurs in shallow, silt-covered gravel areas at the mouths of rivers and streams flowing into the lakes. Spawning occurs over a protracted period from early May until about late July. Shallow areas with small gravel along the shore of the lakes, near the mouths of rivers are essential for successful spawning. Adults prey on a variety of salmonid species within the lake. There has been considerable development around Mesachie Lake and reported increased fishing pressure on prey in Mesachie and Cowichan lakes. It is not known if the size of the population of L. macrostoma has changed since an initial study in the early 1980s, but a study in 2008 captured very few spawning lamprey in Mesachie Lake, possibly indicating that the population is declining.
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Mills, Edward L., Ron M. Dermott, Edward F. Roseman, Donna Dustin, Eric Mellina, David Bruce Conn, and Adrian P. Spidle. "Colonization, Ecology, and Population Structure of the "Quagga'' Mussel (Bivalvia: Dreissenidae) in the Lower Great Lakes." Canadian Journal of Fisheries and Aquatic Sciences 50, no. 11 (November 1, 1993): 2305–14. http://dx.doi.org/10.1139/f93-255.
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An invasive dreissenid mussel given the working name of "quagga" has a present (spring 1993) distribution in the Laurentian Great Lakes from the western basin of Lake Erie to Quebec City. In Lake Erie, quaggas were collected as early as 1989 and now are most common in the eastern basin. In Lakes Erie and Ontario, proportions of quaggas increased with depth and decreasing water temperature. In the eastern basin of Lake Erie, quaggas outnumbered zebra mussel (Dreissena polymorpha) by 14 to 1 in deeper waters (>20 m). In Lake Ontario, quaggas were observed at depths as great as 130 m, and both quagga and zebra mussel were found to survive at depths (>50 m) where temperatures rarely exceed 5 °C. Quaggas were sparse or absent along inland waterways and lakes of New York State. Mean shell size of quagga mussel was larger than that of zebra mussel at sites in the Niagara River, Lake Ontario, and the St. Lawrence River. The largest quaggas (38 mm) were observed in the St. Lawrence River at Cape Vincent.
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Xu, Xia. "Dynamic Variation Analysis on Tibetan Lake Wetlands Based on RS." Advanced Materials Research 779-780 (September 2013): 1246–49. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.1246.
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The wetlands of Tibet plateau have typical characteristics of highest elevation, largest area and most concentrated distribution. Tibetan Plateau Lake Group is one of the main five lake groups in China. TM images of 2000 and 2010 are analyzed by ERDAS and ARCGIS. And Landscape Ecology theory is applied to analyze the spatial and dynamic characteristics of Tibetan lake wetlands. The results show: there are 66643 lakes in 2000 and 54655 lakes in 2010, which means there have disappeared 11988 lakes. Xigaze and Lhokas lakes patches presented decrease trend. The lake wetland of Nagri has increased 3.32%.The lake wetland of Lhoka and Xigaze has decreased 7.37% and 3.52%. MPS, MPE, PSCov and PSSD indexes can reflect the lake wetland dynamic changes than other indexes. Tibetan Plateau is very sensitive to global cliamte change, espectially in Nagqu.
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Singh, Alka, and Vishwambhar Nath Sharma. "Limno-geographical characteristics of Sarua Lake, Gorakhpur, India." National Geographical Journal of India 68, no. 4 (December 31, 2022): 240–49. http://dx.doi.org/10.48008/ngji.1813.
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Lakes have immense ecological, social, cultural and economic value, but eutrophication and siltation in the lake, reduction in area, and depleted water quality have led to a significant deterioration of the lake. This study found the cause-effect relationship between the increasing anthropogenic actions on lake beds to know about the status of lake ecology through limno-geogarphical studies. This study analyzed the spatio-temporal distribution of fifty years, ten types of utility, limno-geographical characteristics (area, average depth, circumference, volume, maximum length, and width), physical quality (EC, pH, TDS, water colour) of lake water lake ecology (TSI), causes and consequences of the deterioration of lake, and stewardship of Sarua Lake in the Gorakhpur district. The ecology of Sarua lake is eutrophic based on Secchi depth due to enter of surface runoff, agricultural runoff which came with a huge amount of nitrate and phosphate and increase the productivity in bottom deposits materials and flourished the immense coverage of littoral plants. The extent of Sarua lake is reduced by 1.65 kilometres squares within 50 years and the average depth decreased by 33 percent within 30 years due to the entry of natural surface runoff and the impact of anthropogenic activities (expansion of human habitat, entering of sewage, expansion of agricultural runoff, reduction of lake extent). These anthropogenic activities generated some opportunities and threats to local livelihoods and altered the social action which was dependent on lake beds from a very primitive time.
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Pothoven, Steven A., and Thomas F. Nalepa. "Feeding Ecology of Lake Whitefish in Lake Huron." Journal of Great Lakes Research 32, no. 3 (September 2006): 489–501. http://dx.doi.org/10.3394/0380-1330(2006)32[489:feolwi]2.0.co;2.
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Jones, Nicholas E. "Incorporating lakes within the river discontinuum: longitudinal changes in ecological characteristics in stream–lake networks." Canadian Journal of Fisheries and Aquatic Sciences 67, no. 8 (August 2010): 1350–62. http://dx.doi.org/10.1139/f10-069.
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Lakes and rivers are intimately connected in an alternating series of lentic and lotic reaches in many regions. The study of lakes and their outlets in hierarchical and branching river networks has not gained the attention of stream ecologists, and little effort has been focused on synthesizing the ecology of lake–stream interactions within a drainage network. Rapid and predictable changes in the ecological characteristics of streams occur at the interface with lakes. The influence that a lake might have on a stream is dependent on its position within the stream, stream type and size, lake size and shape, and the inlet and outlet positions. Little is known about the influences of multiple lakes within stream–lake networks and how these influences are determined by network shape and pattern. Fruitful collaborations and novel insights will come from the combined efforts of limnologists, stream ecologists, and landscape ecologists. Geographic information systems and network analyses will play an important role in summarizing aquatic landscape characteristics and creating a predictive science of aquatic networks. Lakes need to be more explicitly incorporated into ecological concepts in stream ecology, and reciprocally, streams need to be incorporated into ecological concepts involving lakes for the successful management and conservation of our aquatic resources.
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Papa, Rey Donne, and Jonathan Carlo Briones. "Climate and Human-induced Changes to Lake Ecosystems: What We Can Learn From Monitoring Zooplankton Ecology." Journal of Environmental Science and Management 17, no. 1 (June 30, 2014): 60–67. http://dx.doi.org/10.47125/jesam/2014_1/07.
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Long-term time-series data have been proven useful in analyzing the adaptability of zooplankton communities as a response to environmental change. The unique life history and importance of zooplankton in aquatic ecosystems, coupled with the capability of lakes to integrate changes in the surrounding watershed, has given each the recognition as “beacons and sentinels of climate change,” respectively. Aside from this, many lakes have undergone pollution through human-induced eutrophication attributed to extensive lake-shore town development, agricultural waste runoffs, and intensive aquaculture. Implementation of holistic lake management plans in many countries has resulted to the rehabilitation and even reversal of lake eutrophication, and this is, in part, due to regular monitoring and careful analysis of temporal zooplankton community data that came with implemented rehabilitation efforts. As such, monitoring lake zooplankton populations may give us clues as to how changes in the environment, either from human or climate induced changes have already affected lake ecosystems. It is unfortunate however, that such analysis is presently not available in our country due to lack of routine zooplankton monitoring programs. The paper reviewed several successfully implemented lake/zooplankton monitoring programs, highlighted their strong points. The researchers also suggest integrative feasible concepts that are applicable to the country.
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Arthington, AH, HB Burton, RW Williams, and PM Outridge. "Ecology of humic and non-humic dune lakes, Fraser Island, with emphasis on the effects of sand infilling in Lake Wabby." Marine and Freshwater Research 37, no. 6 (1986): 743. http://dx.doi.org/10.1071/mf9860743.
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Aspects of physicochemical limnology and the zooplankton, littoral invertebrates and fish of dune lakes on Fraser Island are described and compared. The comparisons highlight differences between perched, humic lakes and the non-humic Lake Wabby, a water-table window with some morphometric and biological features typical of dune barrage lakes. Lake Wabby has been partially infilled by a mobile sand dune moving mainly in a north-westerly direction across the northern end of the lake. The maximum rate of dune advance estimated from aerial photos was 5.03 m year-1, between 1948 and 1958. Sand infilling between 1975 and 1984 altered the morphometry and substrate characteristics of the lake's eastern region and reduced maximum depth from 13.0 to 11.5 m and volume by 43%. The number of benthic invertebrates was reduced from 14 taxa in 1975 to six taxa in 1984; there was also a significant decrease in abundance of benthic Chironomini during this period (ANOVA, P < 0.05). In both years, an undescribed species of Conochironomus was the most abundant benthic invertebrate in Lake Wabby (250-700 individuals m-2). A new genus of Chironomini (near Paralauter borniella) was discovered. Lake Wabby supported 11 species of fish in 1975 and 1984, but the perched lakes had only one or two species. The five most abundant species in Lake Wabby in 1975 showed evidence of partitioning of food resources, of which the main components were benthic invertebrates and filamentous algae. Allochthonous food resources were not important in fish diets. The possible long-term effects of sand infilling on food resources, fish diets and the composition of the zooplankton in Lake Wabby are discussed.
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Genkal, S. I., and E. Yu Mitrofanova. "Stephanocostis chantaicus (Bacillariophyta), a Rare Species for Russia (Morphology, Ecology, Distribution)." International Journal on Algae 25, no. 1 (2023): 35–42. http://dx.doi.org/10.1615/interjalgae.v25.i1.30.
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The re-examination of <i>Stephanocostis chantaicus</i> Genkal et Kuzmina micrographs from the iconotheca on lakes Khantaiskoye and Teletskoye. A scanning electron microscopy study of new materials from Lake Teletskoye, and analysis of the literature data make it possible to expand the diagnosis of a rare diatom species, <i>S. chantaicus</i>, and specify its ecology and range. The distribution of the species in Lake Teletskoye, and its role among small-celled centric diatoms in the littoral and pelagic zones are also shown.
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Sellers, Todd J., Brian R. Parker, David W. Schindler, and William M. Tonn. "Pelagic distribution of lake trout (Salvelinus namaycush) in small Canadian Shield lakes with respect to temperature, dissolved oxygen, and light." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 1 (January 1, 1998): 170–79. http://dx.doi.org/10.1139/f97-232.
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The distribution of lake trout (Salvelinus namaycush) with respect to water temperature, dissolved oxygen, and light intensity was surveyed in three small Canadian Shield lakes at the Experimental Lakes Area, northwestern Ontario. Based on hydroacoustic and gillnet surveys, there was considerable variation among lakes in temperatures occupied by lake trout during the summer. During the day, lake trout were concentrated at 4-8°C in Lake 375, broadly distributed from 6 to 15°C in Lake 442, and concentrated in the epilimnion at 19°C in Lake 468. At night, lake trout in all lakes occupied epilimnetic waters at 19-20°C. Lake trout inhabited highly oxygenated water, with 75-90% of fish at >6 mg dissolved oxygen ·L-1 throughout the spring and summer in all three lakes. Light intensity did not affect lake trout distribution in Lake 468 but may have contributed to lake trout daytime descent into cool waters in Lakes 375 and 442. We suggest that previously assumed niche boundaries of lake trout do not adequately describe critical habitat for the species in small lakes, the same lakes that are likely most sensitive to erosion of such habitat.
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Vareschi, E., and J. Jacobs. "The ecology of Lake Nakuru." Oecologia 65, no. 3 (February 1985): 412–24. http://dx.doi.org/10.1007/bf00378917.
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Yan, Norman D., Warren I. Dunlop, Trevor W. Pawson, and Lori E. MacKay. "Bythotrephes cederstroemi (Schoedler) in Muskoka Lakes: First Records of the European Invader in Inland Lakes in Canada." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 2 (February 1, 1992): 422–26. http://dx.doi.org/10.1139/f92-048.
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The large predaceous European zooplankter Bythotrephes cederstroemi is now present in eight large recreational lakes in south-central Ontario, Canada: Lake Muskoka, Lake Joseph, Lake Rosseau, Fairy Lake, Mary Lake, Peninsula Lake, Lake Vernon, and Go Home Lake. These observations represent the first evidence that B. cederstroemi has invaded inland lakes in Canada, and we suggest that close monitoring is now needed to establish whether or not pelagic food webs of the lakes will respond.
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Norris, RH, JL Moore, WA Maher, and LP Wensing. "Limnological characteristics of two coastal Dune Lakes, Jervis Bay, South Eastern Australia." Marine and Freshwater Research 44, no. 3 (1993): 437. http://dx.doi.org/10.1071/mf9930437.
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Limnological features of two permanent, closed, coastal dune lakes that are separated by only about 400 m are reported. The depth of Lake Windermere fluctuated by about 7 m during this study (1982- 1988); however, fluctuations up to 15 m were observed between 1970 and 1988. Lake Windermere is exposed to wind mixing, is transparent and is usually mixed, or only weakly stratified. Lake McKenzie is semi-perched, darkly coloured and strongly stratified with an anoxic hypolimnion during summer. It is about one fifth of the surface area and half the depth of Lake Windermere and protected from wind mixing. Both lakes are acidic and have low salinity, and the dominant ions are sodium and chloride probably from precipitation of marine aerosols. Oxygen depletion in the hypolimnion of both lakes indicates a substantial organic load, the source of which is allochthonous material from the catchment rather than autochthonous material. Lake Windermere had higher densities of zooplankton (mostly Calamoecia tasmanica) than Lake McKenzie, but the latter lake had higher numbers of the predaceous Chaoborus sp. Lake McKenzie had higher invertebrate densities than Lake Windermere and these fluctuated widely between years, corresponding with variation in rainfall. Mayflies and chironomids were numerically dominant in Lake McKenzie, and caddisflies and chironomids were numerically dominant in Lake Windermere. Turtle and odonate predators were more common in Lake McKenzie than in Lake Windermere. It is postulated that biological interactions are more important in shaping the communities in Lake McKenzie and physical factors such as wave action are more important in Lake Windermere.
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Levkov, Zlatko, Saúl Krstic Blanco, Teofil Nakov, and Luc Ector. "Ecology of benthic diatoms from Lake Macro Prespa (Macedonia)." Algological Studies 124 (July 1, 2007): 71–83. http://dx.doi.org/10.1127/1864-1318/2007/0124-0071.
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Dítě, Daniel, Pavol Eliáš Jr., Zuzana Dítě, Vladimír Píš, and Róbert Šuvada. "Vegetation classification and ecology of Pannonian salt lake bed." Phytocoenologia 47, no. 4 (December 1, 2017): 329–44. http://dx.doi.org/10.1127/phyto/2017/0137.
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Ding, Yi-fan, Shi-jun Sun, Jiang Feng, Peng Cui, Dan Zhang, and Zhen-yu Long. "An Assessment of Lake Ecology on the Basis of the Macrobenthos Multi-Metric Index (MMI) in 11 Lakes in the Western Region of Jilin, China." Water 13, no. 2 (January 19, 2021): 235. http://dx.doi.org/10.3390/w13020235.
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The western region of Jilin Province is located at the northeastern part of China. A large number of lakes are distributed in this region, where is one of five large lake regions within China, supporting both drinking water and agricultural water. The frequent human activities and scarce rainfall in this region have resulted in weaker lake connectivity and enrichment of the pollutants within the lakes. The lake ecosystems in the region have been degraded to varying degrees, and thus it is necessary to assess its ecological health. Macrobenthos multi-metric index (MMI) is a mature ecological health assessment method that has been widely used in the lake ecosystem assessment all over the world. However, it has not been well developed for assessing the lake water ecosystem in China. In this study, 11 lakes affected by human activities to different degrees were selected as the research objects. They were categorized into three types on the basis of trophic level. Through the comparison and screening of different biological indicators among different lake types, we selected appropriate indicators to construct the MMI. Four core indicators were selected from 58 candidate indicators to construct the MMI: the total number of taxa, Simpson index, percentage of Diptera + Mesogastropod, and percentage of pollution-intolerant species. MMI could distinguish lakes that are seriously and slightly disturbed by humans. The results of regression analysis also showed that the degree of lake eutrophication caused by human activities had a significant correlation with MMI, effectively explaining its changes. MMI can characterize the disturbance and influence of eutrophication on macrobenthos. The results of MMI can also be affected by the land use type and the coverage of aquatic vegetation around the lake, which are important factors affecting the ecological health of the lake. Research on the application of MMI method to assessment of the ecological health of lakes is very rare in Northeast China. This research can provide supplementary information beyond the traditional water environment assessment for the formulation of management strategies.
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Olden, Julian D., Olaf P. Jensen, and M. Jake Vander Zanden. "Implications of long-term dynamics of fish and zooplankton communities for among-lake comparisons." Canadian Journal of Fisheries and Aquatic Sciences 63, no. 8 (August 1, 2006): 1812–21. http://dx.doi.org/10.1139/f06-082.
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Understanding the environmental determinants of lake community composition has been a central pursuit in freshwater ecology. Previous studies have defined community composition based on temporally limited surveys, with the implicit assumption that interannual variation is negligible compared with among-lake variability. Using a long-term data set for fish and zooplankton communities in five north temperate lakes (Wisconsin, USA), we found that interannual, within-lake similarity in species composition (a measure of temporal stability in community composition) generally exceeded community similarity among lakes. Despite these differences, however, the strength of community–environment relationships were found to range widely (2%–99% explained variation) depending on the choice of single-year sample used in the analysis, a result of high temporal coherence in limnological and biological characteristics. Perhaps of greatest concern, interannual similarity in species composition showed consistent relationships with habitat variables commonly used to explain community differences among lakes. Decreasing lake area and shoreline perimeter (indicative of lower habitat heterogeneity) and seepage lakes were associated with low interannual similarity in community composition, thus confounding the ability to differentiate among lake communities according to their habitat characteristics. In light of our results, we offer a number of explicit recommendations for the selection and analysis of community data in future cross-lake studies.
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Greenfield, Ben K., Thomas R. Hrabik, Chris J. Harvey, and Stephen R. Carpenter. "Predicting mercury levels in yellow perch: use of water chemistry, trophic ecology, and spatial traits." Canadian Journal of Fisheries and Aquatic Sciences 58, no. 7 (July 1, 2001): 1419–29. http://dx.doi.org/10.1139/f01-088.
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Recent research suggests that wetland abundance surrounding lakes, fish trophic position, and fish community composition may influence the bioavailability of mercury (Hg) to fish. To compare the importance of these spatial and biological factors to chemical factors known to influence bioavailability, we determined the relationship between 24 lake traits and Hg concentrations in yellow perch (Perca flavescens; whole fish samples) for 43 northern Wisconsin lakes. Independent variables included biological traits such as fish trophic position and body condition, spatial traits such as lake hydrologic position and surrounding wetland abundance, and chemical traits such as pH and water color. The strongest predictor of fish Hg levels was pH (R2 = 0.42; p < 0.002). Of the biological traits measured, yellow perch body condition explained significant additional variation (final R2 = 0.54; p = 0.024). Trophic position explained limited variability and population abundance of planktivores and piscivores were not correlated to perch Hg levels. Regression tree models indicated that small lakes with greater than 6% wetland in their watershed have moderately elevated fish Hg levels. Our results indicate that within-lake chemistry and fish growth patterns are stronger correlates of Hg levels in yellow perch than spatial traits, trophic position, or fish community attributes.
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Lasco, Rodel, and Emil Javier. "Laguna De Bay: A Case Study for Sustainable Fisheries Development." Transactions of the National Academy of Science and Technology 39, no. 2017 (November 2021): 1–4. http://dx.doi.org/10.57043/transnastphl.2017.1060.
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Laguna Lake is the largest source of fish catch from all lakes in the country providing food and livelihood to millions of people. Recently, there were attempts to remove all fish pens and cages from the lake, presumably because of their adverse impact on water quality and pollution. In this paper, we provide an overview of the lake ecology and we identify ways to manage the lake sustainably. For some time, it has been clear that the lake’s ecosystem is deteriorating putting at risk the food source and livelihoods of millions of people. The LLDA, the local government units, and various stakeholders have formulated concrete steps to ensure sustained fish production in the lake.
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Hilberg, Sylke, Florian Sändler, and Florian Fürlinger. "Hydrogeology of alpine lakes in the Northern Calcareous Alps: a comparative study on the role of groundwater in Filblingsee and Eibensee." Austrian Journal of Earth Sciences 115, no. 1 (January 1, 2022): 199–212. http://dx.doi.org/10.17738/ajes.2022.0010.
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Abstract In the Northern Calcareous Alps (NCA) there are countless small lakes with small orographic catchments that are often located only slightly below the respective summit regions. On the one hand, the lakes are located in karstable aquifers and their existence is likely to be related to karstification. Then, they are expected to be directly connected to the karst water body. These lakes are classified as karst lakes. On the other hand, the alpine environment is also influenced by glacial processes and lakes might be related to glacial erosion and deposition. For these glacial lakes, the share of groundwater inflow and outflow is regarded as subordinate even within high permeable karst lithologies. Here we compare two alpine lakes of potentially different origin in the NCA in Salzburg with the aim to provide a basis for an aerial survey of the numerous small alpine lakes in the NCA region and their characterization using the guiding parameters elaborated here. We consider (a) the lake geometry, (b) potential inflow and outflow systems, and (c) physicochemical parameters and hydrochemistry of the Filblingsee and the Eibensee, both located in the Fuschlsee region. Filblingsee was initially considered as a typical karst lake and Eibensee as a moraine-dammed glacial lake. Some clear differences arise in lake geometry, which in the karst lake shows a nearly round surface and concentric depth profile, while the glacial lake is elongated in the direction of glacier flow and has the deepest areas just upstream of the moraine dam. Both lakes show very little to no surficial inflow. Inflow and outflow occur in groundwater in both cases but are not directly tied to a highly permeable karst system. The depth profiles of the field parameters of the two lakes differ only slightly and show a dominant groundwater inflow in mid-depth regions but no flow through at the lake bottom. Water chemistry in both lakes and their potential outflows correspond to the respective aquifer in terms of solution load. Filblingsee can be characterized as a hanging lake in a secondarily sealed doline, Eibensee lies in a glacially excavated depression sealed by glacial sediments. While the inflow and outflow conditions and the hydrochemistry of both lakes are very similar, the lake geometry is a clear distinguishing feature that can be attributed to the different genesis of the two lakes. This can therefore be used as a guiding parameter for the classification of the numerous small alpine lakes in the NCA.
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Dvoryankin, Gennady. "BIOLOGY, ECOLOGY AND FISHERY VALUE OF BREAM ABRAMIS BRAMA (LINNAEUS, 1758) KENOZERSKY NATIONAL PARK." Fisheries 2020, no. 5 (October 9, 2020): 76–79. http://dx.doi.org/10.37663/0131-6184-2020-5-76-79.
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Bream (Abramis Brama L.) on the territory of the Kenozero national Park occurs in the largest lakes of protected areas – Kenozere and Lekshmozere (Belomorsky basin), as well as in lake Maselgsky (Baltic basin), forming three independent, geographically and reproductively isolated populations. In its habitat, bream is the dominant species and, as a result, a permanent object of production for fishermen from among the local residents. This article publishes data on all three bream populations obtained in the course of their own research. Information about its biology, ecology, and population is provided. An assessment of the state of the stock and the role that bream plays in the life of local residents as an aquatic biological resource is given. It is shown that in the Kenozero lake and Lekshmozero lake bream formed a stable and prosperous population. These are the main fishing lakes of the Park, where more than 95% of all fish is extracted. In general, in 2019, the share of bream in the total fish production on the lakes of protected areas, according to official statistics, was about 14%. The current volume of bream catch does not harm the populations of this species and the biodiversity of water ecosystems in protected areas.
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Abell, Jonathan M., Deniz Özkundakci, David P. Hamilton, and Steven D. Miller. "Relationships between land use and nitrogen and phosphorus in New Zealand lakes." Marine and Freshwater Research 62, no. 2 (2011): 162. http://dx.doi.org/10.1071/mf10180.
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Developing policies to address lake eutrophication requires an understanding of the relative contribution of different nutrient sources and of how lake and catchment characteristics interact to mediate the source–receptor pathway. We analysed total nitrogen (TN) and total phosphorus (TP) data for 101 New Zealand lakes and related these to land use and edaphic sources of phosphorus (P). We then analysed a sub-sample of lakes in agricultural catchments to investigate how lake and catchment variables influence the relationship between land use and in-lake nutrients. Following correction for the effect of co-variation amongst predictor variables, high producing grassland (intensive pasture) was the best predictor of TN and TP, accounting for 38.6% and 41.0% of variation, respectively. Exotic forestry and urban area accounted for a further 18.8% and 3.6% of variation in TP and TN, respectively. Soil P (representing naturally-occurring edaphic P) was negatively correlated with TP, owing to the confounding effect of pastoral land use. Lake and catchment morphology (zmax and lake : catchment area) and catchment connectivity (lake order) mediated the relationship between intensive pasture and in-lake nutrients. Mitigating eutrophication in New Zealand lakes requires action to reduce nutrient export from intensive pasture and quantifying P export from plantation forestry requires further consideration.
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Houser, Jeffrey N. "Water color affects the stratification, surface temperature, heat content, and mean epilimnetic irradiance of small lakes." Canadian Journal of Fisheries and Aquatic Sciences 63, no. 11 (November 1, 2006): 2447–55. http://dx.doi.org/10.1139/f06-131.
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The effects of water color on lake stratification, mean epilimnetic irradiance, and lake temperature dynamics were examined in small, north-temperate lakes that differed widely in water color (1.5–19.8 m–1). Among these lakes, colored lakes differed from clear lakes in the following ways: (i) the epilimnia were shallower and colder, and mean epilimnetic irradiance was reduced; (ii) the diel temperature cycles were more pronounced; (iii) whole-lake heat accumulation during stratification was reduced. The depth of the epilimnion ranged from 2.5 m in the clearest lake to 0.75 m in the most colored lake, and 91% of the variation in epilimnetic depth was explained by water color. Summer mean morning epilimnetic temperature was ~2 °C cooler in the most colored lake compared with the clearest lake. In clear lakes, the diel temperature range (1.4 ± 0.7 °C) was significantly (p = 0.01) less than that in the most colored lake (2.1 ± 1.0 °C). Change in whole-lake heat content was negatively correlated with water color. Increasing water color decreased light penetration more than thermocline depth, leading to reduced mean epilimnetic irradiance in the colored lakes. Thus, in these small lakes, water color significantly affected temperature, thermocline depth, and light climate.
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Song, Tao, Yuntong Zhao, Min Wang, and Zhe Cheng. "The Implementation Effect of China’s River and Lake Chief System." Water 16, no. 6 (March 10, 2024): 815. http://dx.doi.org/10.3390/w16060815.
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The river and lake chief system offers a valuable policy toolkit to mitigate the degradation of water ecology, thereby bolstering water resource management for sustainable water development in China. To evaluate the effects of implementation and improve policy, this study took Beijing as a typical case and conducted a quantitative assessment using multidimensional data. The findings suggest that while the river and lake chief system in Beijing is effective and has significantly contributed to the ecological management of rivers and lakes, there are also notable regional disparities and urban–rural divergences. In addition, human activities are the main sources of environmental pollution in rivers and lakes, which should be the focus of the river and lake chief system. The river and lake chief system needs to embed more public participation and cooperative governance. This research aids in better understanding China’s river and lake chief system for both researchers and practitioners, facilitating the advancement of the knowledge body of global water policy and governance.
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Johnson, James H., James E. McKenna, Marc A. Chalupnicki, Tim Wallbridge, and Rich Chiavelli. "Feeding ecology of lake whitefish larvae in eastern Lake Ontario." Journal of Great Lakes Research 35, no. 4 (December 2009): 603–7. http://dx.doi.org/10.1016/j.jglr.2009.08.013.
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Minns, Charles K., James E. Moore, Brian J. Shuter, and Nicholas E. Mandrak. "A preliminary national analysis of some key characteristics of Canadian lakes." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 8 (August 2008): 1763–78. http://dx.doi.org/10.1139/f08-110.
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Knowledge of Canada’s lakes is needed to manage environmental stresses. Lake inventory and lake feature databases were used to build a national impact assessment template and assess regional typology. There are ~910 400 lakes with area ≥ 0.1 km2(10 ha), 37% of the Earth’s total. Lake features (number of lakes by size class, maximum depth, mean–maximum depth ratio, Secchi depth, pH, and total dissolved solids) were modeled regionally by secondary watershed (SWS) using linear regression models. Lake trout ( Salvelinus namaycush ) occurrence was analyzed as a cofactor to highlight regional links between lake characteristics and aquatic biota. Significant (R2from 0.231 to 0.492) regional models were obtained using area or maximum depth, lake trout occurrence, and their cross products as covariates. Analyses of fitted SWS coefficients showed that ecozones were a better predictor of lake characteristics than primary watersheds. The national typology was consistent with previous regional assessments. The regional models were used to estimate the number, area, and volume of lake trout lakes by size class and ecozone. There are ~66 500 lake trout lakes covering ~3 510 000 km2primarily on Boreal and Taiga Shield areas. Regional lake resource models will enable national assessment of stresses such as climate change and invasive species.
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Eckley, C. S., C. J. Watras, H. Hintelmann, K. Morrison, A. D. Kent, and O. Regnell. "Mercury methylation in the hypolimnetic waters of lakes with and without connection to wetlands in northern Wisconsin." Canadian Journal of Fisheries and Aquatic Sciences 62, no. 2 (February 1, 2005): 400–411. http://dx.doi.org/10.1139/f04-205.
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Rates of Hg methylation and demethylation were measured in anoxic hypolimnetic waters of two pristine Wisconsin lakes using stable isotopes of Hg as tracers. One of the lakes is a clear-water seepage lake situated in sandy terrain with minimal wetland influence. The other is a dark-water lake receiving channelized inputs from a relatively large terrestrial wetland. Methyl mercury (MeHg) accumulated in the anoxic hypolimnia of both lakes during summer stratification, reaching concentrations of 0.8 ng·L1 in the clear-water lake and 5 ng·L1 in the dark-water lake. The stable isotopic assays indicated that rate constants of Hg(II) methylation (Km) ranged from 0.01 to 0.04·day1 in the clear-water lake and from 0.01 to 0.09·day1 in the dark-water lake, depending on the depth stratum. On average, Km was threefold greater in the dark-water lake. Hypolimnetic demethylation rate constants (Kdm) averaged 0.03·day1 in the clear-water lake and 0.05·day1 in the dark-water lake. These methylation rates were sufficient to account for the observed accumulation of MeHg in hypolimnetic water during summer in both lakes. Despite substantial export of MeHg from the wetland to the dark-water lake, our study indicates that in-lake production and decomposition of MeHg dominated the MeHg cycle in both lakes.
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Moore, LS. "Water chemistry of the coastal saline lakes of the Clifton-Preston Lakeland system, south-western Australia, and its influence on stromatolite formation." Marine and Freshwater Research 38, no. 5 (1987): 647. http://dx.doi.org/10.1071/mf9870647.
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The water chemistry of Lake Clifton, the adjacent lakes and the regional ground water was investigated to aid in the elucidation of the factors responsible for the restriction of living stromatolites to Lake Clifton. The ionic composition of water in the lakes is proportionally similar to sea water, but the ground water is enriched in calcium and bicarbonate and is of lower salinity (1-2 g I-1). The salinities of the lakes ranged from 7 to 369 g l-1 during 1984 but, in contrast to the other lakes, Clifton remained less saline than sea water throughout the year. Ground waters from an unconfined aquifer on the eastern shore made a large contribution to the annual lake water budget of Lake Clifton, maintaining lake water salinity at less than 35 g l-1 and modifying the chemical composition of the sediment-water interface where stromatolites form. Living, lithified stromatolites occur along the eastern shore of Lake Clifton. They are formed by a benthic microbial community rich in Scytonema. The Stromatolites co-exist with an abundant metazoan fauna, but do not appear to be limited by grazing. Clearly defined zones of ground-water intrusion were found along the eastern foreshore and areas of differential ground-water discharge were associated with morphologically distinctive stromatolites. Occurrence of stromatolites and regions of ground-water discharge in Lake Clifton are consistently associated. It is suggested that the intruding ground waters in Lake Clifton provide a chemical environment conducive to the formation of calcified stromatolites.
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Donald, David B., and David J. Alger. "Geographic distribution, species displacement, and niche overlap for lake trout and bull trout in mountain lakes." Canadian Journal of Zoology 71, no. 2 (February 1, 1993): 238–47. http://dx.doi.org/10.1139/z93-034.
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Indigenous lacustrine populations of bull trout (Salvelinus confluentus) and lake trout (S. namaycush) are spatially separated within the southern part of the zone of distributional overlap (northern Montana, southwestern Alberta, and east-central British Columbia). In this area, lake trout occurred primarily in mountain lakes of 1032–1500 m elevation, while bull trout were found primarily in lakes between 1500 and 2200 m. Introductions of lake trout in the twentieth century and data obtained from beyond the study area indicated that both fishes can establish significant allopatric populations (more than 5% of the catch) in large, deep lakes (>8 ha in area and >8 m deep) over a wide elevation range. We tested the hypothesis that lake trout displace or exclude bull trout from lakes by determining the outcome of introductions of lake trout into two lakes that supported indigenous bull trout. Lake trout were introduced into Bow Lake in 1964, and by 1992 the bull trout population was decimated there and in another lake (Hector) situated 15 km downstream. Thus, lake trout can displace bull trout and may prevent bull trout from becoming established in certain low-elevation lakes. Population age-structure analyses also suggest that lake trout adversely affected bull trout. Bull trout populations in sympatry with lake trout, including the one extirpated from Hector Lake, had few old fish (18% were more than 5 years old; N = 40 fish from three lakes) compared with allopatric populations (49% were more than 5 years old; N = 235 fish from seven lakes). Niche overlap and the potential for competition between the two char species were substantial. In lakes with trophic structure ranging from simple to complex, bull trout and lake trout fed on similar foods and had similar ecological efficiencies (growth rates). Predation by lake trout on bull trout was not documented during the study.
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Trippel, Edward A., and F. William H. Beamish. "Multiple Trophic Level Structuring in Salvelinus–Coregonus Assemblages in Boreal Forest Lakes." Canadian Journal of Fisheries and Aquatic Sciences 50, no. 7 (July 1, 1993): 1442–55. http://dx.doi.org/10.1139/f93-165.
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Hypolimnetic trophic interactions were examined among lake trout (Salvelinus namaycush), cisco (Coregonus artedi), zooplankton, and macroinvertebrates in six northwestern Ontario lakes varying sevenfold in conductivity. Faster growth and larger body size of lake trout in high-conductivity lakes were associated with larger meal sizes, earlier entry of cisco into their diet, and consumption of relatively few, large-bodied prey. Cisco preyed on zooplankton and macroinvertebrates. Cisco were abundant, large bodied, and fast growing in high-conductivity lakes. In one low-conductivity lake (Greenwich Lake), lake trout were 12 times as abundant as cisco whereas in all other lakes, lake trout to cisco ratios were ~ 1:1 or less regardless of conductivity. In Greenwich Lake, lake trout consumed large quantities of age-0 cisco and Mysis relicta, which was associated with "top-down" trophic structuring. Food web analyses strongly suggest that in Greenwich Lake the high abundance of piscivores resulted directly in a low abundance of planktivores and indirectly in a large-bodied zooplankton community and planktivores with rapid growth rates.
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Choiński, Adam, and Artur Zieliński. "Transformation of the morphometry of Lake Osieckie – largest lake in the Holy Cross region." Limnological Review 21, no. 4 (December 1, 2021): 181–87. http://dx.doi.org/10.2478/limre-2021-0017.
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Abstract The paper presents the analysis of the transformation of Lake Osieckie, the largest lake in the Holy Cross region until 2016. It is a valley lake that according to cartographic materials had undergone no changes in the shoreline since ca. 1938. The nearby activity of a sulphur mine required building three dikes on the lake, dividing it into four independent water bodies. The paper presents the analysis of their morphometric properties in comparison to those of the original lake. Although the basins of the new lakes are of natural origin, the currently existing four lakes can be described as quasi-natural.
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Chen, Jiaqi, Jiming Lv, Ning Li, Qingwei Wang, and Jian Wang. "External Groundwater Alleviates the Degradation of Closed Lakes in Semi-Arid Regions of China." Remote Sensing 12, no. 1 (December 20, 2019): 45. http://dx.doi.org/10.3390/rs12010045.
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There are a large number of lakes with beaded distribution in the semi-arid areas of the Inner Mongolian Plateau, and some of them have degraded or even disappeared during the past three decades. We studied the reasons of the disappearance of these lakes by determining the way of replenishment of these lakes and the impact of the natural-social environment of the basin, with the aim of saving these gradually disappearing lakes. Based on remote sensing image and hydrological analysis, this paper studied the recharge of Daihai Lake and Huangqihai Lake. The deep learning method was used to establish the time-series of lake evolution. The same method was combined with the innovative woodland and farmland extraction method to set up the time-series of ground classification composition in the basins. Using relevant survey data, combined with soil water infiltration test, water chemical, and isotopic signature analysis of various water bodies, we found that the Daihai Lake area is the largest in dry season and the smallest in rainy season and the other lake is not satisfied with this phenomenon. In addition, we calculated the specific recharge and consumption of the study basin. These experiments indicated that the exogenous groundwater is recharged directly through the faults at the bottom of Daihai Lake, while the exogenous groundwater is recharged in Huangqihai Lake through rivers indirectly. Large-scale exploitation of groundwater for agricultural irrigation and industrial production is the main cause of lake degradation. Reducing the extraction of groundwater for agricultural irrigation is an important measure to restore lake ecology.
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Patalas, K., and A. Salki. "Spatial Variation of Crustacean Plankton in Lakes of Different Size." Canadian Journal of Fisheries and Aquatic Sciences 50, no. 12 (December 1, 1993): 2626–40. http://dx.doi.org/10.1139/f93-286.
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The patterns of spatial distribution of planktonic crustaceans changed with increasing lake size. Greatest abundances were often found offshore in smaller lakes but nearshore in larger lakes. Interstation similarity of plankton, measured with Jaccard's and Renkonen's indices, was higher in small- to middle-sized lakes and lower in very small and very large lakes, indicating that mechanisms existed at both ends of the size spectrum which prevented plankton from mixing horizontally. The information content of a single central lake sample was evaluated against a lake average from 9–10 stations. To capture at least 80% of the species present, one station was sufficient only in smaller lakes, three to six stations were needed in the smallest and medium-sized lakes, and more than nine stations were needed in the largest lake. The single central station in small- and medium-sized lakes represented average total plankton abundance and dominant species relatively well but underestimated rare species. In larger lakes, lake average plankton was not well characterized by a single station. In Lake Superior, the central station reflected the offshore but not the nearshore community. Neither plankton abundance nor the number of species appeared related to lake size in the series of lakes investigated.
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Hollister, Jeffrey, and Joseph Stachelek. "lakemorpho: Calculating lake morphometry metrics in R." F1000Research 6 (September 21, 2017): 1718. http://dx.doi.org/10.12688/f1000research.12512.1.
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Metrics describing the shape and size of lakes, known as lake morphometry metrics, are important for any limnological study. In cases where a lake has long been the subject of study these data are often already collected and are openly available. Many other lakes have these data collected, but access is challenging as it is often stored on individual computers (or worse, in filing cabinets) and is available only to the primary investigators. The vast majority of lakes fall into a third category in which the data are not available. This makes broad scale modelling of lake ecology a challenge as some of the key information about in-lake processes are unavailable. While this valuable in situ information may be difficult to obtain, several national datasets exist that may be used to model and estimate lake morphometry. In particular, digital elevation models and hydrography have been shown to be predictive of several lake morphometry metrics. The R package lakemorpho has been developed to utilize these data and estimate the following morphometry metrics: surface area, shoreline length, major axis length, minor axis length, major and minor axis length ratio, shoreline development, maximum depth, mean depth, volume, maximum lake length, mean lake width, maximum lake width, and fetch. In this software tool article we describe the motivation behind developing lakemorpho, discuss the implementation in R, and describe the use of lakemorpho with an example of a typical use case.
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Zhao, Zhilong, Zengzeng Hu, Jun Zhou, Ruliang Kan, and Wangjun Li. "Response of Two Major Lakes in the Changtang National Nature Reserve, Tibetan Plateau to Climate and Anthropogenic Changes over the Past 50 Years." Land 12, no. 2 (January 17, 2023): 267. http://dx.doi.org/10.3390/land12020267.
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Areal changes in alpine lakes on the Tibetan Plateau (TP) are reliable indicators of climate change and anthropogenic disturbance. This study used long-term Landsat images and meteorological records to monitor the temporal evolution patterns of lakes within the Changtang National Nature Reserve between 1972 and 2021 and examine the climatic and anthropogenic impacts on lake area changes. The results revealed that the area of Lake LongmuCo and Lake Jiezechaqia significantly expanded by 12.81% and 12.88% from 1972 to 2021, respectively. After 1999, Lake LongmuCo and Lake Jiezechaqia entered into a period of rapid expansion. During 1972–2021, the annual mean temperature significantly increased at a rate of 0.05 °C/a, while the change in annual precipitation was not significant. The temperature change was a major contributor to the observed changes of Lake LongmuCo and Lake Jiezechaqia between 1972 and 2021, while human intervention also played a vital role during 2013–2021. The glaciers around these two lakes decreased by 21.81%, and the increase in water supply from warming-triggered glacier melting was a reason of expansion of Lake LongmuCo and Lake Jiezechaqia. The areas of the two artificial salt lakes affiliated with Lake LongmuCo and Lake Jiezechaqia were 0.24 km2 and 2.67 km2 in 2013 and rose to 0.51 km2 and 9.80 km2 in 2021, respectively. In particular, the continuous exploitations of salt lakes to extract lithium resources have retarded the rate of expansion of Lake LongmuCo and Lake Jiezechaqia. The dams constructed by industrial enterprises have blocked the expansion of Lake LongmuCo to the south. This paper sheds new light on the influences of recent human intervention and climatic variation on alpine lakes within the TP. Due to the importance of alpine lakes in the TP, we need more comprehensive and in-depth efforts to protect the lake ecosystems within the national nature reserves.
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Anderson, Eric, Ayumi Fujisaki-Manome, James Kessler, Gregory Lang, Philip Chu, John Kelley, Yi Chen, and Jia Wang. "Ice Forecasting in the Next-Generation Great Lakes Operational Forecast System (GLOFS)." Journal of Marine Science and Engineering 6, no. 4 (October 21, 2018): 123. http://dx.doi.org/10.3390/jmse6040123.
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Ice Cover in the Great Lakes has significant impacts on regional weather, economy, lake ecology, and human safety. However, forecast guidance for the lakes is largely focused on the ice-free season and associated state variables (currents, water temperatures, etc.) A coupled lake-ice model is proposed with potential to provide valuable information to stakeholders and society at large about the current and near-future state of Great Lakes Ice. The model is run for three of the five Great Lakes for prior years and the modeled ice cover is compared to observations via several skill metrics. Model hindcasts of ice conditions reveal reasonable simulation of year-to-year variability of ice extent, ice season duration, and spatial distribution, though some years appear to be prone to higher error. This modeling framework will serve as the basis for NOAA’s next-generation Great Lakes Operational Forecast System (GLOFS); a set of 3-D lake circulation forecast modeling systems which provides forecast guidance out to 120 h.
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Herbst, Seth J., Bryan S. Stevens, Daniel B. Hayes, and Patrick A. Hanchin. "Estimating walleye (Sander vitreus) movement and fishing mortality using state-space models: implications for management of spatially structured populations." Canadian Journal of Fisheries and Aquatic Sciences 73, no. 3 (March 2016): 330–48. http://dx.doi.org/10.1139/cjfas-2015-0021.
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Fish often exhibit complex movement patterns, and quantification of these patterns is critical for understanding many facets of fisheries ecology and management. In this study, we estimated movement and fishing mortality rates for exploited walleye (Sander vitreus) populations in a lake-chain system in northern Michigan. We developed a state-space model to estimate lake-specific movement and fishery parameters and fit models to observed angler tag return data using Bayesian estimation and inference procedures. Informative prior distributions for lake-specific spawning-site fidelity, fishing mortality, and system-wide tag reporting rates were developed using auxiliary data to aid model-fitting. Our results indicated that postspawn movement among lakes was asymmetrical and ranged from approximately 1% to 42% per year, with the largest outmigration occurring from the Black River, which was primarily used by adult fish during the spawning season. Instantaneous fishing mortality rates differed among lakes and ranged from 0.16 to 0.27, with the highest rate coming from one of the smaller and uppermost lakes in the system. The approach developed provides a flexible framework that incorporates seasonal behavioral ecology (i.e., spawning-site fidelity) in estimation of movement for a mobile fish species that will ultimately provide information to aid research and management for spatially structured fish populations.
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Pickrell, J. "ECOLOGY: Scientists Begin Taming Killer Lake." Science 291, no. 5506 (February 9, 2001): 965b—967. http://dx.doi.org/10.1126/science.291.5506.965b.
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Fryer, Geoffrey. "Ecology: Lunar cycles in lake plankton." Nature 322, no. 6077 (July 1986): 306. http://dx.doi.org/10.1038/322306a0.
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Belk, Mark C., Evelyn Habit, Juan J. Ortiz-Sandoval, Catterina Sobenes, and Elias A. Combs. "Ecology ofGalaxias plateiin a depauperate lake." Ecology of Freshwater Fish 23, no. 4 (December 6, 2013): 615–21. http://dx.doi.org/10.1111/eff.12114.
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Schep, Sebastiaan, Gerard Ter Heerdt, Jan Janse, and Maarten Ouboter. "Possible effects of climate change on ecological functioning of shallow lakes, Lake Loenderveen as a case study." Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation 38, no. 1 (January 1, 2007): 95–104. http://dx.doi.org/10.2478/v10060-008-0026-1.
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Possible effects of climate change on ecological functioning of shallow lakes, Lake Loenderveen as a case study The European Water Framework Directive (WFD) requires all inland and coastal waters to reach "good ecological status" by 2015. The good ecological status of shallow lakes can be characterised by clear water dominated by submerged vegetation. The ecological response of shallow lakes on nutrients largely depends on morphological and hydrological features, such as water depth, retention time, water level fluctuations, bottom type, fetch etc. These features determine the "critical nutrient load" of a lake. When the actual nutrient load of a lake is higher than the critical nutrient load, the ecological quality of this lake will deteriorate, resulting in a turbid state dominated by algae. Climate change might lead to changes in both environmental factors and ecosystem response. This certainly will have an effect on the ecological status. As an illustration the results of a multidiscipline study of a shallow peaty lake (Loenderveen) are presented, including hydrology, geochemistry and ecology. Ground- and surface water flows, nutrient dynamics and ecosystem functioning have been studied culminating in an application of the ecological model of the lake (PCLake). Future scenarios were implemented through changing precipitation, evaporation and temperature. Climate change will lead to higher nutrient loads and lower critical nutrient loads. As a consequence lakes shift easier from clear water to a turbid state.
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Álvarez Cobelas, Miguel. "Ecology of an alluvial-seepage lake: El Campillo (SE Madrid, Spain)." Boletín de la Real Sociedad Española de Historia Natural 2023/117 (2023): 21–49. http://dx.doi.org/10.29077/bol.2023.117.alvarez.
Full textAbstract:
The gravel-pit lake number of Madrid County is high arising from the dramatically-growing building industry in the last decades, which has needed huge quantities of materials coming from nearby alluvial plains, giving rise to newly-formed lakes. Some of those lakes are close to streams and experience the indirect influence of riverine and alluvial environments, as is the case for Campillo lake, which is located in the lower Jarama catchment. This contribution reviews its available ecological knowledge, also supplying information previously unknown. In addition to the aforementioned water inputs, with the accompanying nutrient income, the occurrence of a Northern gypsum cliff is important because 1st it supplies runoff sulphate to the lake and 2nd summer dynamics in anoxic lake layers is associated with its partial reduction to sulphide and the behaviour of iron and manganese. This low transparency, stratifying lake is dominated by a stable phytoplankton in the long-term where the cyanobacterium Planktothrix agardhii prevails. Its status is hypertrophic, albeit long-term analyses suggest that the phosphorus concentration is declining, a fact that could arise from its recent partial abatement in the Jarama river. Finally, more updated and widened knowledge on lake biodiversity is necessary and some remedial actions to improve its environmental quality are suggested. El número de lagunas de gravera existentes en la Comunidad de Madrid es elevado, como resultado de la enorme actividad constructora en las últimas décadas, la cual ha necesitado gran cantidad de materiales de construcción extraídos de ellas. Algunas se encuentran muy próxi¬mas a los ríos y la influencia indirecta tanto del medio fluvial como del acuífero aluvial sobre las mismas es muy patente, como en el caso de la laguna del Campillo, situada en el tramo bajo del río Jarama. Este artículo revisa los conocimientos existentes sobre dicho ecosistema, aña¬diendo mucha información inédita. Además de la citada alimentación hídrica, que lleva aparejada la entrada de nutrientes al lago, resulta muy importante la presencia de un acantilado yesífero septentrional que aporta sulfato a la laguna por escorrentía y cuya dinámica estival en las zonas anóxicas de la laguna se asocia con su reducción parcial a sulfuros y con la de hierro y manga¬neso. El ecosistema, de escasa transparencia y térmicamente estratificado durante buena parte del año, está dominado por un fitoplancton estable a largo plazo donde reina la cianobacteria Planktothrix agardhii, y es hipertrófico, si bien los datos sugieren que las concentraciones de fósfo¬ro han disminuido desde hace unos años, lo cual podría deberse al reciente descenso de dichas concentraciones en el río Jarama. En cuanto a los organismos, el conocimiento de la biodiver¬sidad lacustre necesita ampliarse y actualizarse. Este artículo propone también algunas medidas para mejorar el ecosistema.