Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 774

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Book Description

Author: Duncan Peter Gray
Publisher: Science & Technical Publishing Department of Conservation
ISBN: 9780478143409
Category : Braided river ecology
Languages : en
Pages : 50

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Book Description
A braided river is one that, over some part of its length, flows in multiple, mobile channels across a gravel floodplain. In New Zealand, many braided rivers remain in a relatively unmodified condition, but increasing demands for hydro-electricity generation, irrigation, gravel extraction and flood protection works are placing pressure on these systems. However, apart from a limited number of studies on the ecology of individual species or reaches, there has been little coordinated ecological research to assess the overall values and function of braided river ecosystems in New Zealand. This review summarises the international and New Zealand literature on braided rivers, with particular emphasis on benthic invertebrate ecology. Braided rivers typically experience short-term channel migration within the active bed and greater lateral channel migration across the entire floodplain in the longer term. Channel migration occurs because steep headwater tributaries supply highly variable discharges and mobile erodable substrates to the mainstem. Braided rivers typically possess extended floodplains, which may contain a mosaic of floodplain habitats ranging from highly unstable main-stem channels to stable spring complexes. Main channel aquatic invertebrate communities are frequently low in diversity and dominated by the leptophlebiid mayfly Deleatidium spp., but also chironomids and elmid beetles. In contrast, floodplain springs can have highly diverse communities rich in amphipods, mayflies, caddis, snails and chironomids. Groundwater and floodplain pond habitats also occur frequently and can contain several specialist taxa. Braided rivers and their floodplains are spatially complex, temporally dynamic habitats with high landscape- and reach-scale biodiversity values. The challenge facing managers is to protect this biodiversity within the context of increasing human demands on the rivers. This report highlights the particular threats and management issues associated with braided rivers in New Zealand and identifies areas where future research is required.

Author: Johanne Fischer
Publisher: Food & Agriculture Organization of the UN (FAO)
ISBN:
Category : Nature
Languages : en
Pages : 120

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Book Description
This review provides an appraisal of existing, state-of-the-art fish identification (ID) tools (including some in the initial stages of their development) and shows their potential for providing the right solution in different real-life situations. The ID tools reviewed are: Use of scientific experts (taxonomists) and folk local experts, taxonomic reference collections, image recognition systems, field guides based on dichotomous keys; interactive electronic keys (e.g. IPOFIS), morphometrics (e.g. IPez), scale and otolith morphology, genetic methods (Single nucleotide polymorphisms [SNPs] and Barcode [BOL]) and Hydroacoustics. The review is based on the results and recommendations of the workshop "Fish Identification Tools for Fishery Biodiversity and Fisheries Assessments," convened by FAO FishFinder and the University of Vigo and held in Vigo, Spain, from 11 to 13 October 2011. It is expected that it will help fisheries managers, environmental administrators and other end users to select the best available species identification tools for their purposes.--

Author: Evald Ojaveer
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 428

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Book Description

Author: Jon S. Harding
Publisher:
ISBN:
Category : History
Languages : en
Pages : 826

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Book Description

Author: Michael R. Rosen
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 520

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Book Description
Groundwaters of New Zealand is the definitive new source for information on the groundwater resources of New Zealand. Written by many of New Zealand's leading experts, the book covers varied aspects of groundwater research, assessment, use, and management in New Zealand. This book is divided into two parts. The first part documents the history of groundwater development in New Zealand, and current research on interactions between groundwater systems and other components of the hydrological cycle such as health, processes (recharge and groundwater-surface water interaction) and techniques (isotopic methods). The second part of the book provides up-to-date regional summaries of groundwater resources and quality in every region of the country. Groundwater quality is explored in chapters on groundwater chemistry and microbiology, and the health aspects of groundwater. The book also contains detailed regional summaries, covering the location, use, quality, and management of groundwater resources, for the entire country.This book will be the essential reference text for all environmental, engineering, and resource management professionals working with groundwater, and students of the many scientific and engineering disciplines that contribute to groundwater investigations. Many groundwater users, both practicing and in school will find this book a valuable reference that adds significantly to their understanding of groundwater resources.-back cover.

Author: Gwendolyn A. Thunhorst
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 190

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Book Description
This guide provides current and available information (characteristics, appearance, wildlife benefits, and hydrology) for most of the trees, shrubs, herbaceous emergents, and submerged and floating aquatic vegetation that dominate the tidal and nontidal wetlands of the northeastern United States. It is organized to be of maximum utility to those individuals that are developing the designs (plans and specifications) for wetland construction, enhancement, and restoration projects.

Author: G.E. Petts
Publisher: Springer Science & Business Media
ISBN: 9400914911
Category : Science
Languages : en
Pages : 792

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Book Description
Fluvial Hydrosystems provides a unified approach to the study of running waters and aims to provide a scientific basis for sustainable management of rivers. It differs from traditional texts in viewing rivers as structured, four-dimensional systems and integrating ecological and geomorphological approaches to provide a holistic perspective on river dynamics. Advanced students of geomorphology, ecology, environmental science, land use and civil engineering will all benefit from this wide-ranging and stimulating textbook.

Author: Kathleen S. Cole
Publisher: Univ of California Press
ISBN: 0520947975
Category : Science
Languages : en
Pages : 643

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Book Description
Marine fishes represent astonishing diversity with respect to practically every aspect of their biology. Reproductive modes and sexual patterns are especially fascinating and provide deep insight into general evolutionary problems. In this volume, chapters focus on reproduction and sexuality among groups of fishes defined by habitat, taxon, and the reproductive processes that are critical for reproductive success. The book illustrates how knowledge of reproductive biology among marine fishes can help identify vulnerable and potentially vulnerable species in the face of changing environmental conditions and increasing human-based pressures.

Author: Robert R. Stickney
Publisher: John Wiley & Sons
ISBN: 9780471131540
Category : Technology & Engineering
Languages : en
Pages : 412

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Book Description
Aquaculture in the United States is a significant agribusiness industry, but it is also a troubled one whose future is clouded by doubt. Many aquaculture practices, such as deliberately introducing exotic species, hatcheries programs, and pen culture in protected waters have come under intense attack from environmentalists. Economic pressures on the industry from the value of coastal land, the unavailability of suitable supplies of water, and the legal costs of regulations have restricted growth. This book looks at the past, present and future of a troubled industry.