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Author: Elena Blair Publisher: ISBN: Category : Droughts Languages : en Pages : 47
Book Description
Although most streams in California are intermittent, bioassessment protocols are designed for perennial streams, with sampling periods anytime between April and June. Sampling intermittent streams during this period may not provide an accurate assessment of stream health, because of the stream community dynamics related to the predictable drying of intermittent streams in Mediterranean climates. Furthermore, climate change may cause perennial streams to become intermittent and intermittent streams to cease flow entirely. The objectives of this study were to assess the recolonization process and community dynamics within and among three intermittent streams each with a different hydrologic regime (dry, isolated pools, and low flow in the summer/fall months) and to assess whether the current bioassessment protocol sampling period appropriately accounts for differences in community composition recovery of intermittent streams. Macroinvertebrates and environmental information were collected at three intermittent streams from August 2013 to July 2014 near Sunol, CA. Sampling was conducted at frequent intervals (1, 8, 15, and 22 days) once stream flow resumed after the dry season; after 22 days, samples were collected every three weeks until the streams dried. All streams exhibited rapid recolonization (especially San Antonio Creek, which only flowed for five weeks) once flow resumed, suggesting taxa were well adapted to the Mediterranean climate and may have resistant/resilient life history traits to survive drying in the summer months. Taxa richness was highest in isolated pool habitats (due to an increase in x predatory and air breathing taxa), contradicting most findings that increased connectivity is associated with higher taxa richness. Non Metric Multidimensional Scaling was used to assess community composition within and among the three streams. Communities became more similar during months of continuous flow (February, March, and early April), suggesting that an earlier sampling window than currently used would be useful for bioassessment. In conclusion, there is a need for more studies regarding macroinvertebrate community dynamics in relation to standard bioassessment sampling protocols and how the effects of floods, flow permanence, and drought influence community dynamics in Mediterranean climate intermittent streams.
Author: Elena Blair Publisher: ISBN: Category : Droughts Languages : en Pages : 47
Book Description
Although most streams in California are intermittent, bioassessment protocols are designed for perennial streams, with sampling periods anytime between April and June. Sampling intermittent streams during this period may not provide an accurate assessment of stream health, because of the stream community dynamics related to the predictable drying of intermittent streams in Mediterranean climates. Furthermore, climate change may cause perennial streams to become intermittent and intermittent streams to cease flow entirely. The objectives of this study were to assess the recolonization process and community dynamics within and among three intermittent streams each with a different hydrologic regime (dry, isolated pools, and low flow in the summer/fall months) and to assess whether the current bioassessment protocol sampling period appropriately accounts for differences in community composition recovery of intermittent streams. Macroinvertebrates and environmental information were collected at three intermittent streams from August 2013 to July 2014 near Sunol, CA. Sampling was conducted at frequent intervals (1, 8, 15, and 22 days) once stream flow resumed after the dry season; after 22 days, samples were collected every three weeks until the streams dried. All streams exhibited rapid recolonization (especially San Antonio Creek, which only flowed for five weeks) once flow resumed, suggesting taxa were well adapted to the Mediterranean climate and may have resistant/resilient life history traits to survive drying in the summer months. Taxa richness was highest in isolated pool habitats (due to an increase in x predatory and air breathing taxa), contradicting most findings that increased connectivity is associated with higher taxa richness. Non Metric Multidimensional Scaling was used to assess community composition within and among the three streams. Communities became more similar during months of continuous flow (February, March, and early April), suggesting that an earlier sampling window than currently used would be useful for bioassessment. In conclusion, there is a need for more studies regarding macroinvertebrate community dynamics in relation to standard bioassessment sampling protocols and how the effects of floods, flow permanence, and drought influence community dynamics in Mediterranean climate intermittent streams.
Author: Thibault Datry Publisher: Academic Press ISBN: 0128039043 Category : Science Languages : en Pages : 624
Book Description
Intermittent Rivers and Ephemeral Streams: Ecology and Management takes an internationally broad approach, seeking to compare and contrast findings across multiple continents, climates, flow regimes, and land uses to provide a complete and integrated perspective on the ecology of these ecosystems. Coupled with this, users will find a discussion of management approaches applicable in different regions that are illustrated with relevant case studies. In a readable and technically accurate style, the book utilizes logically framed chapters authored by experts in the field, allowing managers and policymakers to readily grasp ecological concepts and their application to specific situations. - Provides up-to-date reviews of research findings and management strategies using international examples - Explores themes and parallels across diverse sub-disciplines in ecology and water resource management utilizing a multidisciplinary and integrative approach - Reveals the relevance of this scientific understanding to managers and policymakers
Author: Royal Entomological Society of London. Symposium Publisher: CABI ISBN: 1845934334 Category : Aquatic insects Languages : en Pages : 344
Book Description
"Considers the challenges facing insect populations in aquatic environments and how they have adapted to achieve such prominence in virtually all habitats." SUMMARY.
Author: Publisher: Elsevier ISBN: 0124172105 Category : Science Languages : en Pages : 441
Book Description
Advances in Ecological Research is one of the most successful series in the highly competitive field of ecology. Each volume publishes topical and important reviews, interpreting ecology as widely as in the past, to include all material that contributes to our understanding of the field. Topics in this invaluable series include the physiology, populations, and communities of plants and animals, as well as landscape and ecosystem ecology. - Topical and important reviews - Interpreting ecology as widely as in the past, to include all material that contributes to our understanding of the field - Topics include the physiology, populations, and communities of plants and animals, as well as landscape and ecosystem ecology
Author: Jon E. Keeley Publisher: Cambridge University Press ISBN: 0521824915 Category : Nature Languages : en Pages : 523
Book Description
Explores the role of fire in Mediterranean-type climate ecosystems, providing unique insights into the assembly and evolutionary convergence of ecosystems.
Author: P. Sam Lake Publisher: John Wiley & Sons ISBN: 1444341790 Category : Science Languages : en Pages : 458
Book Description
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.
Author: Kate Roberts Publisher: ISBN: Category : Invertebrate communities Languages : en Pages : 0
Book Description
Natural stresses such as drought can cause changes in macroinvertebrate community composition over time. This study examines the relationship between low flows, macroinvertebrate habitat and the macroinvertbrate community. The sensitivity of AUSRIVAS biological monitoring methods to impacts associated with low flows are also examined. A flow threshold was used to define low flows and to test for changes in macroinvertebrate habitat and macroinvertebrate communities. Assessments of the biological condition of the macroinvertebrate community were performed using AUSRIVAS predictive models. Low flows reduced the available habitat for macroinvertebrates, thus altering resources for macroinvertebrates. However, macroinvertebrate abundance and community composition showed no significant response to the effects of low. AUSRIVAS assessments detected few reductions in biological condition of macroinvertebrate under low flow conditions. The threshold value used to define drought was useful for determining habitat change, but was appropriate for determinig levels at which changes to the macroinvertebrate community occur. Alternative methods such as a combination of low flow thresholds, low flow duration and channel characteristics may enable observations of biological impacts associated with low flow conditions.
Author: Elena Blair
Author: Elena Blair
Author: Leah Anne Bêche
Author: Thibault Datry
Author: Royal Entomological Society of London. Symposium
Author: Andrew John Boulton
Author: 
Author: Jon E. Keeley
Author: P. Sam Lake
Author: Kate Roberts
Author: Southern California Coastal Water Research Project