Download or read book The Effects of Salinity Pulses of Varying Duration and Intensity on Three Freshwater Submerged Aquatic Vegetation Species written by Rebecca Wright and published by . This book was released on 2012 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Literature Review of the Effects of Waves on Aquatic Plants written by Anne Kimber and published by . This book was released on 1994 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Salinity Changes on the Aquatic Vegetation on Lake Charm Lake Tutchewop and Cullens Lake written by J. F. Saunders and published by . This book was released on 1979 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Salinity Tolerance in Plants Mechanisms and Regulation of Ion Transport written by Vadim Volkov and published by Frontiers Media SA. This book was released on 2018-01-12 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Life presumably arose in the primeval oceans with similar or even greater salinity than the present ocean, so the ancient cells were designed to withstand salinity. However, the immediate ancestors of land plants most likely lived in fresh, or slightly brackish, water. The fresh/brackish water origins might explain why many land plants, including some cereals, can withstand moderate salinity, but only 1 – 2 % of all the higher plant species were able to re-discover their saline origins again and survive at increased salinities close to that of seawater. From a practical side, salinity is among the major threats to agriculture, having been one of the reasons for the demise of the ancient Mesopotamian Sumer civilisation and in the present time causing huge annual economic losses of over 10 billion USD. The effects of salinity on plants include osmotic stress, disruption of membrane ion transport, direct toxicity of high cytoplasmic concentrations of sodium and chloride on cellular processes and induced oxidative stress. Ion transport is the crucial starting point that determines salinity tolerance in plants. Transport via membranes is mediated mostly by the ion channels and transporters, which ensure selective passage of specific ions. The molecular and structural diversity of these ion channels and transporters is amazing. Obtaining the detailed descriptions of distinct ion channels and transporters present in halophytes, marine algae and salt-tolerant fungi and then progressing to the cellular and the whole organism mechanisms, is one of the logical ways to understand high salinity tolerance. Transfer of the genes from halophytes to agricultural crops is a means to increase salt tolerance of the crops. The theoretical scientific approaches involve protein chemistry, structure-function relations of membrane proteins, synthetic biology, systems biology and physiology of stress and ion homeostasis. At the time of compiling this e-book many aspects of ion transport under salinity stress are not yet well understood. The e-book has attracted researchers in ion transport and salinity tolerance. We have combined our efforts to achieve a wider, more detailed understanding of salt tolerance in plants mediated by ion transport, to understand present and future ways to modify and manipulate ion transport and salinity tolerance and also to find natural limits for the modifications.

Download or read book Salinity Tolerance in Plants Methods Mechanisms and Management written by B.K. Garg and published by Scientific Publishers. This book was released on 2011-03-01 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Salinity tolerance in plants is a complex problem encompassing numerous morphological, physiological and biochemical processes and adaptations at the cellular, sub-cellular and whole plant levels. The book comprising eleven chapters deals with diverse aspects of salt tolerance including plant response to salinity and sodicity, crop tolerance at different growth stages and criteria for evaluating the same. The mechanism of salt injury viz. osmotic, ionic and nutrient imbalance has been dealt with, adopting an integrated appraoch. Likewise, the recent information on photosynthesis, respiration, carbohydrate, nitrogen and protein metabolism, enzyme dynamics and plant hormones, as well as nodulation and symbiotic nitrogen fixation in legumes has been elaborated comprehensively. Special attention has been given to the interaction between essential nutrients and salinity as it is vital for alleviation of adverse effects of salt stress. The synthesis of knowledge on different mechanisms of salt resistance, including osmoregulation with organic and inorganic solutes has also been presented. Various methods of introducing salt tolerance in plants such as breeding, genetic variations, physiological approaches, tissue culture, somaclonal variation, somatic hybridation and recombinat DNA technology have been discussed. The nature and properties of salt affected soils and groundwaters and principles for amelioration and management of these critical problems have been included in this book. Furthermore, Afforestation and Agroforestry techniques for salt affected soils with emphasis on salt tolerant tree species and suitable tree crop combinations also find their much needed due space in the present book.

Download or read book The Effect of Salinity to Several Freshwater Aquatic Species of Southern Victoria written by G.J. Bacher and published by . This book was released on 1992 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aquatic Plant Control Research Program Effects of Salinity and Irradiance Conditions on the Growth Morphology and Chemical Composition of Submersed Aquatic Macrophytes written by Robert R. Twilley and published by . This book was released on 1990 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrilla verticillata, Myriophyllum spicatum, Potamogeton perfoliatus, and Vallisneria americana were compared among different salinity and light conditions. The culture solution in five pairs of tanks was gradually adjusted to salinities of 0, 2, 4,6, and 12 ppt. With the exception of H. verticillata, the sea plants may be considered eurysaline species that are able to salinities one third the strength of seawater. With increasing salinity, the influorescence production decreased in M. spicatum and P. perfoliatus, yet asexual reproduction in the latter species by underground buds remained constant. Stem elongation increased in response to shading in M. spicatum, while shaded P. perfoliatus has higher concentrates of chlorophyll a. In association with high epiphytic mass, chlorophyll a concentrations in all species were greatest at 12 ppt. The concentration of sodium increased in all four species examined, indicating that these macrophytes did not possess mechanisms to exclude this ion. The nitrogen content of the plants tested increased significantly with higher sodium concentrate, suggesting that nitrogen may be used in osmoregulation.

Download or read book Drought and Aquatic Ecosystems written by P. Sam Lake and published by John Wiley & Sons. This book was released on 2011-06-09 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Droughts are a major hazard to both natural and human-dominated environments and those, especially of long duration and high intensity, can be highly damaging and leave long-lasting effects. This book describes the climatic conditions that give rise to droughts, and their various forms and chief attributes. Past droughts are described including those that had severe impacts on human societies. As a disturbance, droughts can be thought of as “ramps” in that they usually build slowly and take time to become evident. As precipitation is reduced, flows from catchments into aquatic systems decline. As water declines in water bodies, ecological processes are changed and the biota can be drastically reduced, though species and populations may survive by using refuges. Recovery from drought varies in both rates and in degrees of completeness and may be a function of both refuge availability and connectivity. For the first time, this book reviews the available rather scattered literature on the impacts of drought on the flora, fauna and ecological processes of aquatic ecosystems ranging from small ponds to lakes and from streams to estuaries. The effects of drought on the biota of standing waters and flowing waters and of temporary waters and perennial systems are described and compared. In addition, the ways in which human activity can exacerbate droughts are outlined. In many parts of the world especially in the mid latitudes, global warming may result in increases in the duration and intensity of droughts. Drought and Aquatic Ecosystems is essential reading for freshwater ecologists, water resource managers and advanced students.

Download or read book The Effects of Fluid Flow and Epiphytes on Submerged Aquatic Vegetation written by Amy Therese Hansen and published by . This book was released on 2012 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Wetlands Newsletter written by and published by . This book was released on 1996 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interaction between marine invertebrates and symbiotic microbes in a changing environment Community structure and ecological functions written by Jie Li and published by Frontiers Media SA. This book was released on 2023-02-15 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Federal Register written by and published by . This book was released on 2012-04 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Rapid Salinity Change on Submersed Aquatic Plants written by Chanda Jones Littles and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrilla verticillata exhibited 100% mortality at 15 and 25 ppt, irrespective of exposure duration. Relative to controls, M. spicatum and V. americana exhibited declines in growth at 15 ppt after 1 and 2 day exposures; both exhibited significant mortality after a 7 day exposure. All three species experienced significant mortality at 25 ppt. Storm events are likely to have a marked influence on the vegetative structure of this tidally influenced system.

Download or read book The Structuring Role of Submerged Macrophytes in Lakes written by Erik Jeppesen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid growth of the discipline of aquatic ecology has been driven both by scientific interest in the complexities of aquatic ecosystems and by their enormous environmental importance and sensitivity. This book focuses on the remarkably diverse roles played by underwater plants, and is divided into three parts: 10 thematic chapters, followed by 18 case studies, and rounded off by three integrative chapters. The topics range from macrophytes as fish food to macrophytes as mollusc and microbe habitat, making this of interest to aquatic ecologists as well as limnologists, ecosystem ecologists, microbial ecologists, fish biologists, and environmental managers.

Download or read book Physical Habitat Modifications by Submerged Aquatic Vegetation written by Sofia Licci and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Submerged aquatic vegetation often grows in lotic systems in patches generated by scale-dependent feedbacks. As ecosystem engineers, plants modify the physical environment triggering positive feedbacks within the patch and negative feedbacks alongside the patch, resulting in regular pattern formation. These scale-dependent feedbacks enable to explain only the lateral expansion of patches, but not their longitudinal development. The objective was to study the processes that trigger positive and negative feedbacks for plants along patches and the consequences for patch dynamics. In situ coupled measurements of hydrodynamics, sediment characteristics, and plant morphology were performed along patches of increasing length. The results demonstrated that a minimum patch length was needed to induce in-patch velocity reduction and fine sediment accumulation. As a consequence of these modifications, patch length influenced the nutrient concentrations in interstitial water of the in-patch sediment, this effect being observed only over a certain threshold length. Over this threshold length, the sediment presented an accumulation of ammonium and depletion of nitrates. Plant height was related to patch length by a quadratic relationship, suggesting that negative feedbacks occur over a certain patch length, probably due to the high ammonium concentration that can be toxic for plants in the range measured. The threshold lengths over which patches influence the biogeochemical processes and negative feedbacks occur were reduced in the ecosystem presenting the highest nutrient level. The results also demonstrated that the physical habitat modifications induced by patches depend on the plant traits and patch characteristics. The plant-induced modifications of the physical habitat have cascading effects on the biogeochemical processes and plant growth, which depended on the environmental conditions, with consequences for patch dynamics and ecosystem functioning.

Download or read book Salinity Effects on Species Composition Productivity and Decomposition of Macrophytes in Coastal Peatlands written by Cheryl Costillas Batistel and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impact of salinity on coastal peatland vegetation was investigated. Phragmites australis is the most dominant emergent macrophyte in freshwater to mesohaline peatlands. Other common species include Typha latifolia, Carex spp. and Schoenoplectus tabernaemontani. P. australis and S. tabernaemontani are resilient to salinity and frequent salinity pulses while Carex sp. and T. latifolia are not. Litter decomposition rates of these macrophytes do not vary in freshwater and oligohaline peatlands.eng

Download or read book Ecology Abstracts written by and published by . This book was released on 1996 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coverage: 1982- current; updated: monthly. This database covers current ecology research across a wide range of disciplines, reflecting recent advances in light of growing evidence regarding global environmental change and destruction. Major ares of subject coverage include: Algae/lichens, Animals, Annelids, Aquatic ecosystems, Arachnids, Arid zones, Birds, Brackish water, Bryophytes/pteridophytes, Coastal ecosystems, Conifers, Conservation, Control, Crustaceans, Ecosyst em studies, Fungi, Grasses, Grasslands, High altitude environments, Human ecology, Insects, Legumes, Mammals, Management, Microorganisms, Molluscs, Nematodes, Paleo-ecology, Plants, Pollution studies, Reptiles, River basins, Soil, TAiga/tundra, Terrestrial ecosystems, Vertebrates, Wetlands, Woodlands.