Download or read book Genetic Differentiation of Commercially Important Alaskan Tanner Crab Chionoecetes Bairdi Populations written by Thomas Andrew Bunch and published by . This book was released on 1997 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Diversity and Population Genetic Structure of Tanner Crab Chionoecetes Bairdi in Alaskan Waters written by Genevieve M. Johnson and published by . This book was released on 2019 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tanner crab (Chionoecetes bairdi) is a large-bodied species of crab harvested in commercial, personal use, and subsistence fisheries across Alaska. The commercial fisheries were highly productive until the 1980s, when most stocks faced major declines and were closed to harvest. The recovery success of stocks throughout the state has been variable throughout the subsequent decades, leading managers to question whether there are aspects of the population dynamics that are not accounted for. There is limited information on the genetic population structure of C. bairdi in Alaskan waters, which has caused uncertainty about whether established management areas align well with distribution and migration patterns for this species. I applied novel high throughput sequencing methods to measure genetic diversity and investigate the genetic population structure of C. bairdi in Alaskan waters. Genomic DNA was isolated from samples collected from Southeast Alaska, Prince William Sound, and the Eastern Bering Sea, both east and west of 166°W longitude, and processed according to a Double-Digest Restriction-Associated DNA Sequencing protocol. The final genotype assembly included 89 individuals that were genotyped at 2,740 independent, neutral single-nucleotide polymorphism (SNP) sites, and contained 3.06% missing data. The average observed heterozygosity across SNP sites within regions was significantly lower than the average heterozygosity expected for populations in Hardy-Weinberg equilibrium. An analysis of molecular variance indicated that genetic variability was mostly found within individuals (90%), 10% of variability was observed between individuals within sampling regions, and no significant amount of variation was detected between sampling regions. Furthermore, pairwise FST estimates between sampling regions were low, and thus the null model of panmixia could not be rejected. Principal components analysis was also congruent with a model of no differentiation among regions. Bayesian analysis implemented in the program STRUCTURE did not support any population partitioning above K = 1 clusters, again indicating that there is not substantial genetic differentiation among the regions sampled from across the state of Alaska. These results indicate high gene flow throughout the distribution of Tanner crab across the Alaska continental shelf. Recognized stocks are genetically indistinguishable from each other. This may indicate that stocks exchange a substantial number of migrants, and may not operate independently. This new information can provide insights as management plans are evaluated and refined.

Download or read book Biology of the Tanner Crab Chionoecetes Bairdi in Alaska written by Daniel Urban and published by . This book was released on 1999 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kodiak Alaska Tanner Crab Chionoecetes Bairdi Research written by William E. Donaldson and published by . This book was released on 1977 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biological Field Techniques for Chionoecetes Crabs written by Luke S. Jadamec and published by Alaska Sea Grant College Program. This book was released on 1999 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This important publication enables standardization of data collection by fisheries observers and shoreline samplers, crab and shellfish biologists, and fishermen. Wide use of the book promises to improve data accuracy, and thus promote good management for these commercially important crabs. When data are collected citing this publication, there should be little or no ambiguity as to measurements made and definitions used. This guide is not all inclusive, but is intended to identify structures and organs, measurements and descriptions, and techniques that are commonly used in field studies"--p. vi.

Download or read book Defining Genetic Structure in Alaskan Populations of the Snow Crab Chionoecetes Opilio written by Sarah Mincks Hardy and published by . This book was released on 2011 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reconstruction of Historic Abundances of Kodiak Chignik and South Peninsula Tanner Crab written by Daniel Urban and published by . This book was released on 1999 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the estimation methods used to reconstruct historic population levels of Tanner crab (Chionoecetes bairdi) in the Kodiak, Chignik and South Peninsula management districts.

Download or read book Life History and Population Dynamics of Two Species of Tanner Crab written by David Somerton and published by . This book was released on 1981 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Defining Genetic Population Structure and Historical Connectivity of Snow Crab Chionoecetes Opilio written by Gregory T. Albrecht and published by . This book was released on 2011 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: The snow crab (Chionoecetes opilio) is a valuable commercial resource within the Bering Sea, as well as other areas in the North Pacific and Atlantic Oceans. Large populations are known to exist within the Chukchi and Beaufort Seas, including recently discovered commercial sized individuals (Beaufort). However, genetic connectivity throughout these regions has not been examined until now. Based on seven polymorphic microsatellite loci, relatively low population genetic structuring occurs throughout the Alaskan region (Gst = 0.001). This homogeneity is likely due to long-distance larval dispersal, adult migrations, and a possible recent population expansion following the last glacial maximum. Furthermore, meta-population analysis was conducted for Alaskan and Northwest Atlantic stocks. Although significant genetic divergence characterizes the West Greenland stock in relation to all other populations, low divergence (Gst = 0.005) was found between Atlantic Canada crabs and those from the Alaska region. Larval dispersal between regions is highly unlikely due to the transit distance. Therefore, low divergence is likely the result of a recent population expansion into the Northwest Atlantic

Download or read book 1981 Westward Region Tanner Crab Population Surveys written by William A. Colgate and published by . This book was released on 1981 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigations of Life History and Fishery for Tanner Crab Chionoecetes Bairdi in Alaska written by William A. Colgate and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling Workshop on Year class Strength of Tanner Crab Chionoecetes Bairdi written by Albert Vincent Tyler and published by . This book was released on 1997 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarizes a workshop on brood-strength formation of Tanner crabs held at the Juneau Center, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks. The workshop's purpose was to establish a synthesis of the biotic and abiotic relationships that may influence year-class strength of Tanner crabs in Bristol Bay.

Download or read book Population assessment trawl survey for the tanner crab Chionoecetes bairdi around Kodiak Island 1986 written by William E. Donaldson and published by . This book was released on 1988 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reproductive Potential of Female Eastern Bering Sea Tanner Crab written by Michael Knutson (Fishery biologist) and published by . This book was released on 2020 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Changes in abundance and sex ratio can contribute to variation in the reproductive potential of a population. The commercially important Bering Sea Tanner crab (Chionoecetes bairdi) are distributed throughout the north Pacific Ocean and display cyclical population dynamics. The goal of this study was to examine how fishing pressures and population dynamics affected the reproductive potential of Bering Sea Tanner crab to better inform sustainable fishery management. I quantified female stored sperm levels and fecundity for both primiparous (in their first reproductive cycle) and multiparous (in their second or later reproductive cycle) crab to examine spatial and temporal variation in reproductive potential. Multiparous female crab had higher spermathecal load than primiparous ones, but spermathecal load varied widely across female size. Higher sperm cell counts were associated with visual indication of fresh ejaculate for primiparous crab but not for multiparous crab. Sperm cell counts increased with increasing spermathecal load for both primiparous and multiparous crab, although the slope of the regression line varied for the two categories. Female fecundity was highest in crab in their second year after the terminal molt to maturity and was lower in the first year and in the third and subsequent years. Female fecundity (size-corrected) did not differ among management areas. Measures of mature female sperm storage and quantification of reproductive stage can provide fishery managers with an early warning of reproductive failures.

Download or read book Investigations of Life History and Fishery for Tanner Crab Chionoecetes Bairdi in the Westward Region Alaska 1983 written by William A. Colgate and published by . This book was released on 1985 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Ethogram and Description of Mating Behavior for the Tanner Crab Chionoecetes Bairdi M J Rathbun written by William E.. Donaldson and published by . This book was released on 1986 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Alaska Tanner Crab Chionoecetes Bairdi Investigations written by William E. Donaldson and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: