Author: Darcy Christine Pickard
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 130
Get Book Here
Book Description
Evaluating the effectiveness of different river habitat rehabilitation actions on salmonid populations is very difficult due to lack of replication, independence and effects occurring outside the river habitat. We evaluate several experimental designs to determine which designs are most likely to detect a difference in habitat creation (rather than population abundance) resulting from different mechanical rehabilitation actions. Fry-rearing habitat is believed to be the limiting type of habitat for Chinook (Oncorhynchus tshawytscha) in the Trinity River. This habitat is lost as growth of riparian vegetation forms permanent berms along the river edge. Cost is used as a simple measure of the complexity of a single mechanical action. We model the formation of berms using transition state matrices. The model allows for different probabilities given different rehabilitation actions, flow volumes and dependence on upstream conditions. The performance of alternative designs under different model conditions is compared and presented.
Author:
Publisher:
ISBN:
Category : Delta Region (Calif.)
Languages : en
Pages : 504
Get Book Here
Book Description
Author: Sean Patrick Gallagher
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 108
Get Book Here
Book Description
Author: Philip Roni
Publisher: Food & Agriculture Org.
ISBN: 9789251053546
Category : Business & Economics
Languages : en
Pages : 140
Get Book Here
Book Description
This technical paper reviews current information on the effectiveness of habitat rehabilitation techniques for inland fisheries, based on published evaluations of projects including studies on roads improvements and sediment reduction, riparian and floodplain rehabilitation, placement of habitat structures in lakes and streams, and the addition of nutrients to increase aquatic production. It also sets out information on planning, prioritising and monitoring rehabilitation projects.
Author: VTN Environmental Sciences (Firm)
Publisher:
ISBN:
Category : Wildlife conservation
Languages : en
Pages : 508
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 188
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Trinity River Watershed (Calif.)
Languages : en
Pages : 60
Get Book Here
Book Description
Author: Carson J. Watkins
Publisher:
ISBN:
Category : Fish communities
Languages : en
Pages : 174
Get Book Here
Book Description
The Kootenai River supports some of the Pacific Northwest's most important cultural and recreational fishery resources. Lotic fishes have been substantially influenced by alteration to the course and function of large rivers throughout the world. Like many large river systems, the Kootenai River has been degraded by extensive water development and land use activities that have disrupted its function and integrity. As such, managers have attempted to rehabilitate degraded lotic habitats to support a variety of fish assemblages. The Kootenai River is one such large river where managers are improving habitat conditions for native fishes. I investigated spatial variation in fish assemblage structure and the influence of habitat on fish assemblages and species-specific occurrence and relative abundance within the context of an ongoing habitat rehabilitation project. In addition, I evaluated the sampling effort required to estimate various levels of species richness to guide future monitoring efforts of fishes in the Kootenai River. Fishes were collected throughout the braided reach of the Kootenai River during the summers of 2012 and 2013 to evaluate patterns in fish assemblage and population structure among rehabilitation and reference sites. In general, I found that fish assemblage structure varied among sites and that native fishes had high spatial association with one another. I identified several environmental variables associated with the occurrence and relative abundance of native species and evaluated the effect of those variables. My research also provided insight on sampling effort requirements to achieve target levels of species richness that will help fishery scientists be efficient during monitoring efforts. My results provide guidance and valuable information on the spatial occurrence of fishes in the Kootenai River and on habitat use patterns that can be used to design future rehabilitation projects to benefit native species. In addition, my evaluation of sampling effort requirements will help managers to develop realistic sampling objectives and optimize protocols for evaluating the effects of habitat rehabilitation on fish assemblages in the Kootenai River.
Author: U.S. Fish and Wildlife Service. Division of Ecological Services. Sacramento Field Office
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 144
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Get Book Here
Book Description
