Download or read book Using Strontium Isotopes to Track Pacific Salmon Migrations in Alaska written by Sean Reiss Brennan and published by . This book was released on 2014 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pacific salmon (Oncorhynchus spp.) are an important cultural, ecological, and economic natural resource in Alaska. Not only do salmon maintain an important mechanism of nutrient transport between marine, aquatic, and terrestrial ecosystems, but they also provide a sustainable food and economic resource for human communities. A challenging issue in the management, conservation, and research of Pacific salmon is tracking their responses to perturbations across the multiple scales of population structure that characterize these species. Research has shown how the inherent biodiversity of Pacific salmon imparts resiliency to environmental change, and temporal stability to their overall productivity and the human systems dependent upon such productivity (e.g., fisheries). The vast biodiversity of salmon arises primarily via precise natal homing of adults to their rivers of origin, resulting in locally adapted populations. Thus, there have been considerable efforts to develop methods to effectively manage and monitor Pacific salmon biodiversity. One important example is using genetic differentiation among populations to discern the relative contributions of genetically distinct stocks in mixed stock fishery harvests. In the Bristol Bay region, sockeye salmon (O. nerka) harvests can be discerned at the watershed level (i.e., the nine major watersheds contributing to the fishery). However, tens to hundreds of locally adapted populations exist within each of these watersheds and methods to apportion fishery harvests to this finer scale population structure are lacking. This dissertation presents a new method in Alaska to discern fine-scale population structure (i.e., within watersheds) of Chinook salmon (O. tshawytscha) harvests using a naturally occurring geochemical tracer in rivers, strontium (Sr) isotopes (87Sr/86Sr). To this end, in Chapter 1, I characterize the statewide geographic variation on multiple spatial scales in 87Sr/86Sr ratios of Alaska's rivers and discuss the geochemical and geological controls of observed 87Sr/86Sr ratios. In Chapter 2, I approach the persistent problem of evaluating site-specific temporal variation, especially in remote Subarctic and Arctic regions, by employing the non-migratory behavioral ecology of slimy sculpin (Cottus cognatus). Finally, in Chapter 3, I demonstrate how the development of temporally and spatially robust 87Sr/86Sr baseline datasets within the Nushagak River was able to apportion a mixed stock fishery harvest of Chinook salmon conducted in Nushagak Bay back to natal sources at the sub-basin watershed level. Because of the conservative nature of the 87Sr/86Sr ratio during physical and biological processes, the development of this method is applicable not only to Chinook salmon, but also to other salmon species (e.g., sockeye and coho salmon, O. kisutch). Additionally, the development of baseline 87Sr/86Sr information (e.g., waters) and an overall research framework to employ this tracer in provenance studies, have statewide implications for the research and management of other migratory animals.

Download or read book A Golden Age for Strontium Isotope Research Current Advances in Paleoecological and Archaeological Research written by Brooke Crowley and published by Frontiers Media SA. This book was released on 2022-02-18 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Forecasting the Abundance and Timing of Sockeye Salmon Migrations to Chignik Alaska written by Steven S. Parker and published by . This book was released on 1986 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Regional and Climate driven Factors Affecting the Migrations of Sockeye Salmon Oncorhynchus Nerka Smolts in Alaska written by Christopher R. Dailey and published by . This book was released on 2020 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The downstream migration of salmon smolts is triggered by a combination of responses to multiple environmental indicators, imposed on internal circannual rhythms, that result in variation between populations in timing. Using long-term data on daily smolt counts and associated environmental variables from multiple sources across Alaska, I tested the hypothesis that variation in migration timing between different sockeye salmon populations could be explained by differences in local environmental conditions. I first analyzed the peak, width, and interannual variation of the smolt migration period for eight populations from southwestern and southcentral Alaska. I then modeled the median emigration date and width of the emigration period as a function of stream temperature, air temperature, and precipitation to assess how each population responds to combinations of seasonal environmental cues that serve as indicators for the onset of downstream migration or conditions in the recipient environment (sea surface temperature). Lastly, I used the results of my analysis to identify spatial variation in the response of distinct salmon populations to environmental factors and identify trends in the migration timing of those populations. Through my analysis, I found that sea surface temperature and freshwater temperature are the primary environmental factors that control median smolt emigration date, while the width of the smolt emigration window is influenced primarily by freshwater temperatures and precipitation, with significant site-by-site variation.

Download or read book Forecasting the Abundance of Sockeye Salmon Migrations to Chignik Alaska written by Steven S. Parker and published by . This book was released on 1987 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Review of Information on Salmon Migrations in Southeastern Alaska written by United States. Bureau of Commercial Fisheries. Alaska Region and published by . This book was released on 1959 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The importance of routes of migration, amount of time in the fishery, and fishing intensity in setting regulations has resulted in many salmon tagging experiments being performed in Southeastern Alaska. These experiments have been primarily with pink salmon, although the other four species have also been tagged in fewer numbers ... [T]he important experiments are summarized in the following discussion"--Introduction.

Download or read book Tracking Past Sockeye Salmon Oncorhyncus Nerka Population Dynamics in Alaska Using Paleolimnology written by Irene S. Gregory-Eaves and published by . This book was released on 2002 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Salmon Migrations in Southeastern Alaska written by Wallace H. Noerenberg and published by . This book was released on 1959* with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Migration of Sockeye Salmon in the Kodiak Archipelago written by Richard W. Tyler and published by . This book was released on 1986 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stable Isotopes in Ecological Research written by P.W. Rundel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis of stable isotope ratios represents one of the most exciting new technical advances in environmental sciences. In this book, leading experts offer the first survey of applications of stable isotope analysis to ecological research. Central topics are - plant physiology studies - food webs and animal metabolism - biogeochemical fluxes. Extensive coverage is given to natural isotopes of carbon, hydrogen, oxygen, nitrogen, sulfur, and strontium in both terrestrial and marine ecosystems. Ecologists of diverse research interests, as well as agronomists, anthropologists, and geochemists will value this overview for its wealth of information on theoretical background, experimental approaches, and technical design of studies utilizing stable isotope ratios.

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1967 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Conservation Paleobiology written by Gregory P. Dietl and published by University of Chicago Press. This book was released on 2017-11-17 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: In conservation, perhaps no better example exists of the past informing the present than the return of the California condor to the Vermilion Cliffs of Arizona. Extinct in the region for nearly one hundred years, condors were successfully reintroduced starting in the 1990s in an effort informed by the fossil record—condor skeletal remains had been found in the area’s late-Pleistocene cave deposits. The potential benefits of applying such data to conservation initiatives are unquestionably great, yet integrating the relevant disciplines has proven challenging. Conservation Paleobiology gathers a remarkable array of scientists—from Jeremy B. C. Jackson to Geerat J. Vermeij—to provide an authoritative overview of how paleobiology can inform both the management of threatened species and larger conservation decisions. Studying endangered species is difficult. They are by definition rare, some exist only in captivity, and for those still in their native habitats any experimentation can potentially have a negative effect on survival. Moreover, a lack of long-term data makes it challenging to anticipate biotic responses to environmental conditions that are outside of our immediate experience. But in the fossil and prefossil records—from natural accumulations such as reefs, shell beds, and caves to human-made deposits like kitchen middens and archaeological sites—enlightening parallels to the Anthropocene can be found that might serve as a primer for present-day predicaments. Offering both deep-time and near-time perspectives and exploring a range of ecological and evolutionary dynamics and taxa from terrestrial as well as aquatic habitats, Conservation Paleobiology is a sterling demonstration of how the past can be used to manage for the future, giving new hope for the creation and implementation of successful conservation programs.

Download or read book Tracking Animal Migration with Stable Isotopes written by and published by Academic Press. This book was released on 2008-04-09 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tracking Animal Migration with Stable Isotopes provides a consolidated overview of the current knowledge of stable isotopes in terrestrial migration research questions. It offers ecologists and conservation biologists provide a practical handbook for those considering using stable isotopes in their migration research. - Presents information for readers to understand how to apply isotopic methods for tracking - Critical information on areas for future research - Practical guidelines and discussions of sample collection, sample preparation, and data analysis - Enhanced understanding of data and statistical analysis in isotope-based studies of migratory animals

Download or read book Stable Isotopes in Ecology and Environmental Science written by Robert Michener and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights new and emerging uses of stable isotope analysis in a variety of ecological disciplines. While the use of natural abundance isotopes in ecological research is now relatively standard, new techniques and ways of interpreting patterns are developing rapidly. The second edition of this book provides a thorough, up-to-date examination of these methods of research. As part of the Ecological Methods and Concepts series which provides the latest information on experimental techniques in ecology, this book looks at a wide range of techniques that use natural abundance isotopes to: follow whole ecosystem element cycling understand processes of soil organic matter formation follow the movement of water in whole watersheds understand the effects of pollution in both terrestrial and aquatic environments study extreme systems such as hydrothermal vents follow migrating organisms In each case, the book explains the background to the methodology, looks at the underlying principles and assumptions, and outlines the potential limitations and pitfalls. Stable Isotopes in Ecology and Environmental Science is an ideal resource for both ecologists who are new to isotopic analysis, and more experienced isotope ecologists interested in innovative techniques and pioneering new uses.

Download or read book Oceanic Abstracts with Indexes written by and published by . This book was released on 1979 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oceanic Abstracts written by and published by . This book was released on 1997 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stable Isotopes as Indicators of Ecological Change written by and published by Academic Press. This book was released on 2011-09-21 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 20th century has experienced environmental changes that appear to be unprecedented in their rate and magnitude during the Earth's history. For the first time, Stable Isotopes as Indicators of Ecological Change brings together a wide range of perspectives and data that speak directly to the issues of ecological change using stable isotope tracers. The information presented originates from a range of biological and geochemical sources and from research fields within biological, climatological and physical disciplines covering time-scales from days to centuries. Unlike any other reference, editors discuss where isotope data can detect, record, trace and help to interpret environmental change. - Provides researchers with groundbreaking data on how to predict the terrestrial ecosystems response to the ongoing rapid alterations - Reveals how ecosystems have responded to environmental and biotic fluctuations in the past - Includes examples from research by a wide range of biological and physical scientists who are using isotopic records to both detect and interpret environmental change