A full life history synthesis of Arrowtooth Flounder ecology in the Gulf of Alaska: Exposure and sensitivity to potential ecosystem change

2018 ◽  
Vol 142 ◽  
pp. 28-51 ◽  
Author(s):  
Miriam J. Doyle ◽  
Casey Debenham ◽  
Steven J. Barbeaux ◽  
Troy W. Buckley ◽  
Jodi L. Pirtle ◽  
...  
Keyword(s):  
Life History ◽  
Gulf Of Alaska ◽  
Ecosystem Change ◽  
Full Life ◽  
Arrowtooth Flounder

scholarly journals Comparing the roles of Pacific halibut and arrowtooth flounder within the Gulf of Alaska ecosystem and fishing economy

2019 ◽  
Author(s):  
James J. Ruzicka ◽  
Stephen Kasperski ◽  
Stephani Zador ◽  
Amber Himes‐Cornell
Keyword(s):  
Gulf Of Alaska ◽  
Pacific Halibut ◽  
Arrowtooth Flounder

scholarly journals Methods for Identifying Species Complexes Using a Novel Suite of Multivariate Approaches and Multiple Data Sources: A Case Study With Gulf of Alaska Rockfish

2021 ◽  
Vol 8 ◽  
Author(s):  
Kristen L. Omori ◽  
Cindy A. Tribuzio ◽  
Elizabeth A. Babcock ◽  
John M. Hoenig
Keyword(s):  
Life History ◽  
Best Practice ◽  
Gulf Of Alaska ◽  
Data Sources ◽  
Multivariate Techniques ◽  
Fishing Gear ◽  
Data Types ◽  
Species Complexes ◽  
Multivariate Approaches

International and national laws governing the management of living marine resources generally require specification of harvest limits. To assist with the management of data-limited species, stocks are often grouped into complexes and assessed and managed as a single unit. The species that comprise a complex should have similar life history, susceptibility to the fishing gear, and spatial distribution, such that common management measures will likely lead to sustainable harvest of all species in the complex. However, forming complexes to meet these standards is difficult due to the lack of basic biological or fisheries data to inform estimates of biological vulnerability and fishery susceptibility. A variety of cluster and ordination techniques are applied to bycatch rockfish species in the Gulf of Alaska (GOA) as a case study to demonstrate how groupings may differ based on the multivariate techniques used and the availability and reliability of life history, fishery independent survey, and fishery catch data. For GOA rockfish, our results demonstrate that fishing gear primarily defined differences in species composition, and we suggest that these species be grouped by susceptibility to the main fishing gears while monitoring those species with high vulnerabilities to overfishing. Current GOA rockfish complex delineations (i.e., Other Rockfish and Demersal Shelf Rockfish) are consistent with the results of this study, but should be expanded across the entire GOA. Differences observed across species groupings for the variety of data types and multivariate approaches utilized demonstrate the importance of exploring a diversity of methods. As best practice in identifying species complexes, we suggest using a productivity-susceptibility analysis or expert judgment to begin groupings. Then a variety of multivariate techniques and data sources should be used to identify complexes, while balancing an appropriate number of manageable groups. Thus, optimal species complex groupings should be determined by commonality and consistency among a variety of multivariate methods and datasets.

scholarly journals Generation time, life history and the substitution rate of neutral mutations

2014 ◽  
Vol 10 (11) ◽  
pp. 20140801 ◽  
Author(s):  
Jussi Lehtonen ◽  
Robert Lanfear
Keyword(s):  
Life History ◽  
Generation Time ◽  
Life Histories ◽  
Life History Traits ◽  
Theoretical Understanding ◽  
Substitution Rates ◽  
Demographic Theory ◽  
Full Life ◽  
Iteroparous Species ◽  
Neutral Mutations

Our understanding of molecular evolution is hampered by a lack of quantitative predictions about how life-history (LH) traits should correlate with substitution rates. Comparative studies have shown that neutral substitution rates vary substantially between species, and evidence shows that much of this diversity is associated with variation in LH traits. However, while these studies often agree, some unexplained and contradictory results have emerged. Explaining these results is difficult without a clear theoretical understanding of the problem. In this study, we derive predictions for the relationships between LH traits and substitution rates in iteroparous species by using demographic theory to relate commonly measured life-history traits to genetic generation time, and by implication to neutral substitution rates. This provides some surprisingly simple explanations for otherwise confusing patterns, such as the association between fecundity and substitution rates. The same framework can be applied to more complex life histories if full life-tables are available.

scholarly journals Sea-surface temperature used to predict the relative density of giant Pacific octopuses (Enteroctopus dofleini) in intertidal habitats of Prince William Sound, Alaska

2015 ◽  
Vol 66 (10) ◽  
pp. 866 ◽  
Author(s):  
D. Scheel
Keyword(s):  
Life History ◽  
Puget Sound ◽  
Negative Relationship ◽  
Gulf Of Alaska ◽  
Sea Surface ◽  
Prince William Sound ◽  
Larval Stages ◽  
Enteroctopus Dofleini ◽  
By Catch ◽  
Catch Statistics

Productivity linked to upwelling strength is an important environmental factor affecting the production and dynamics of octopus populations. This often takes the form of a negative relationship between octopus abundance and sea-surface temperatures (SST). Enteroctopus dofleini (giant Pacific octopuses) is caught as by-catch in several fisheries, but management for octopuses is data-poor. Visual surveys (in Prince William Sound (PWS) and Puget Sound) showed significant negative correlations of octopus counts with winter SST over the previous 30 months in the waters of eastern Gulf of Alaska, as expected on the basis of life-history parameters. In PWS, local octopus densities varied more than six-fold during the study, and correlations with SST accounted for 48–61% of the variance in counts. Octopus by-catch datasets were not similarly significantly correlated with SST. The negative correlation with SST suggests that octopus populations are influenced by factors regulating marine productivity during larval stages of life history far from the site of recruitment to benthic habitats. Targeted visual surveys for E. dofleini may be more predictable than by-catch statistics, and may be better estimators of variation in octopus abundance.

How long do whirligig mites live? A survey of lifespan in Anystidae (Acari: Trombidiformes)

Zoosymposia ◽  
2021 ◽  
Vol 20 ◽  
Author(s):  
ZHI-QIANG ZHANG
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Developmental Time ◽  
Predatory Mites ◽  
Immature Stages ◽  
Adult Males ◽  
Life History Data ◽  
Full Life Cycle ◽  
Full Life ◽  
Anystis Baccarum

The Anystidae are a family of over 100 species of predatory mites commonly seen in soils and on plants worldwide. A few species of genus Anystis have potential as biocontrol agents against some insect and mite pests. Herein I provide a review of the lifespan of the Anystidae as part of a series on the lifespans in the Acari. The full life cycle in this family includes six immature stages (the egg, prelarva, larva, protonymph, deutonymph and tritonymph) and adult males/females. Life history data are only available for a few species. Developmental times from eggs to adults (44 to 82 days at 21 or 22 °C) were reported for three Anystis species. The total lifespan was measured for only one species (Anystis agilis): 66 days at 21 °C. There are two to three generations per year for Anystis species in the field. Summer aestivation was reported for Anystis baccarum, either as eggs or tritonymphs; aestivating tritonymphs may have a developmental time and total lifespan of over 200 and 300 days, respectively.

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