Redesigning harvest strategies for sustainable fishery management in the face of extreme environmental variability

2021 ◽  
Author(s):  
Laura K. Blamey ◽  
Éva E. Plagányi ◽  
Trevor Hutton ◽  
Roy A. Deng ◽  
Judy Upston ◽  
...  
Keyword(s):  
Fishery Management ◽  
Environmental Variability ◽  
The Face ◽  
Sustainable Fishery

scholarly journals Phenotypic states become increasingly sensitive to perturbations near a bifurcation in a synthetic gene network

eLife ◽  
2015 ◽  
Vol 4 ◽  
Author(s):  
Kevin Axelrod ◽  
Alvaro Sanchez ◽  
Jeff Gore
Keyword(s):  
Gene Network ◽  
Environmental Variability ◽  
Synthetic Gene ◽  
Phenotypic Switching ◽  
Proper Function ◽  
Critical Transition ◽  
Environmental Perturbations ◽  
The Face ◽  
Synthetic Gene Network ◽  
Open Question

Microorganisms often exhibit a history-dependent phenotypic response after exposure to a stimulus which can be imperative for proper function. However, cells frequently experience unexpected environmental perturbations that might induce phenotypic switching. How cells maintain phenotypic states in the face of environmental fluctuations remains an open question. Here, we use environmental perturbations to characterize the resilience of phenotypic states in a synthetic gene network near a critical transition. We find that far from the critical transition an environmental perturbation may induce little to no phenotypic switching, whereas close to the critical transition the same perturbation can cause many cells to switch phenotypic states. This loss of resilience was observed for perturbations that interact directly with the gene circuit as well as for a variety of generic perturbations-such as salt, ethanol, or temperature shocks-that alter the state of the cell more broadly. We obtain qualitatively similar findings in natural gene circuits, such as the yeast GAL network. Our findings illustrate how phenotypic memory can become destabilized by environmental variability near a critical transition.

scholarly journals ISOLATION AND CHARACTERIZATION OF NEW MICROSATELLITE MARKERS FOR THE CORTÉS GEODUCK (Panopea globosa)

2016 ◽  
Vol 31 (1) ◽  
pp. 17
Author(s):  
Celia Isabel Bisbal -Pardo ◽  
Miguel Ángel Del Río -Portilla ◽  
Ana Yonori Castillo -Paéz ◽  
Axayácatl Rocha-Olivares
Keyword(s):  
Fishery Management ◽  
Genetic Research ◽  
Isolation And Characterization ◽  
Expected Heterozygosity ◽  
Tetranucleotide Repeats ◽  
Hardy Weinberg Equilibrium ◽  
Increasing Demand ◽  
Sustainable Fishery ◽  
Generation Technology

The geoduck Panopea globosa is a long-lived and large endemic infaunal clam sustaining a growing fishery in the Northwest coast of México that, in spite of its increasing demand in Asian markets very little is known about its biology. In order to provide genetic markers to support genetic research of wild populations, nine novel microsatellite loci (di-, tri-, and tetranucleotide repeats) were developed using shotgun sequencing with next generation technology (Illumina). The number of alleles per locus ranged from 3 to 16 and the observed and expected heterozygosity ranged from 0.286 to 0.650 and 0.504 to 0.906, respectively. Five loci were found to be significantly deviated from the Hardy-Weinberg equilibrium and three pairs showed evidence of linkage disequilibrium. Most loci are highly informative for population genetics and linkage analyses according to their polymorphism information content (> 0.5) and will be useful for increasing our understanding of the wild population structure and developing a sustainable fishery management. Aislamiento y caracterización de nuevos marcadores microsatelitales en la almeja generosa (Panopea globosa) La almeja generosa Panopea globosa es una especie infáunica longeva y de gran tamaño que mantiene una pesquería creciente en la costa del Noroeste de México. A pesar de su demanda creciente en los mercados asiáticos, se conoce muy poco acerca de su biología. Con la finalidad de proveer nuevos marcadores genéticos para la caracterización de poblaciones silvestres, se desarrollaron nueve marcadores microsatelitales nuevos (con patrones repetidos de di-, tri-, y tetranucleotídicos) utilizando secuenciación genómica aleatoria con tecnología de secuenciación de siguiente generación (Illumina). El número de alelos por locus varió de 3 a 16 y los valores de heterocigosidad observada y esperada variaron de 0.286 a 0.650 y 0.504 a 0.906, respectivamente. Cinco microsatelites se desvían del equilibrio de Hardy-Weinberg y tres pares de microsatélites mostraron evidencia de desequilibrio de ligamiento. La mayoría de los loci son altamente informativos para estudios poblacionales y análisis de ligamiento de acuerdo con su contenido de información de polimorfismos (> 0.5) y serán útiles para incrementar el conocimiento de la estructura genética de las poblaciones silvestres de esta almeja y para coadyuvar en su pesquería sustentable.

Experiences in Dealing with Maritime Disputes

2016 ◽  
Vol 4 (1) ◽  
pp. 85-98 ◽  
Author(s):  
Seokwoo Lee
Keyword(s):  
Fishery Management ◽  
Northeast Asia ◽  
The Yellow Sea ◽  
Law Of The Sea ◽  
Development Zone ◽  
Joint Development ◽  
Fishery Resources ◽  
Maritime Disputes ◽  
Sustainable Fishery ◽  
Japan And China

Maritime disputes in the Northeast Asia region are nothing new. The Exclusive Economic Zone (eez) regime under the u.n. Convention on the Law of the Sea (unclos) spurred many coastal states, including these countries, to declare eezs. This has led Korea to conclude bilateral fishery agreements with Japan and China, with the goals of achieving sustainable fishery management in the East Sea (Sea of Japan) and the Yellow Sea, and peacefully cooperating with these countries in sharing fishery resources in the region. While not without shortcomings, the agreements provide important procedures for cooperation in fisheries management and sustaining fishery resources. In addition to competition over fishery resources, Korea and Japan agreed to establish a Joint Development Zone (jdz) in 1974. Although the Korea-Japan jdz, however, has not produced oil so far, it nevertheless serves as a model for maritime dispute resolution.

Optimum Escapements in the Face of Alternative Recruitment Hypotheses

1981 ◽  
Vol 38 (6) ◽  
pp. 678-689 ◽  
Author(s):  
Carl J. Walters
Keyword(s):  
Dynamic Programming ◽  
Adaptive Management ◽  
Stochastic Models ◽  
Value Of Information ◽  
Fishery Management ◽  
Historical Experience ◽  
Active Probing ◽  
Adaptive Policy ◽  
The Face ◽  
Stock Recruitment

Available data are often inadequate to discriminate among alternative models that make different predictions about the consequences of allowing escapements outside the range of recent historical experience. Dynamic programming is used to show that the optimum policy in such situations can involve active probing or experimentation with escapements. The optimum adaptive policy is usually difficult to compute, but generally may be closely approximated by a "Bayes equivalent" policy that is simpler to estimate but does not account explicitly for the value of information associated with allowing more extreme escapements. While there are various practical difficulties in estimating and implementing an optimum policy, it is concluded that regular probing experiments should be included in every fishery management plan.Key words: stock-recruitment, optimization, adaptive management, stochastic models

Pollution Control and Sustainable Fishery Management in Southern Songkhla Lake, Thailand

2016 ◽  
pp. 155-183
Author(s):  
Kunlayanee Pornpinatepong ◽  
Sakchai Kiripat ◽  
Sinad Treewanchai ◽  
Sukampon Chongwilaikasaem ◽  
Chotima Pornsawang ◽  
...  
Keyword(s):  
Pollution Control ◽  
Fishery Management ◽  
Sustainable Fishery ◽  
Songkhla Lake

scholarly journals Growth pattern of freshwater bivalve mollusk Lamellidens marginalis (Lamarck, 1819) from the northwest Bangladesh

2019 ◽  
Vol 27 ◽  
pp. 121-132
Author(s):  
DA Nahar ◽  
MR Islam ◽  
MS Islam ◽  
S Jasmine ◽  
MMR Mondol
Keyword(s):  
Growth Pattern ◽  
Fishery Management ◽  
Freshwater Mussel ◽  
Freshwater Ecosystem ◽  
Allometric Growth ◽  
Freshwater Bivalve ◽  
Shell Weight ◽  
Tissue Weight ◽  
Length Width ◽  
Sustainable Fishery

Growth, morphometry and length-weight relationships of the freshwater mussel Lamellidens marginalis (Lamarck, 1819) was studied during January 2014 and May 2015. Sampling was carried out monthly and a total of 560 specimens were collected from Rajshahi district, northwest of Bangladesh. The recorded length -breadth and length-width relationships were B = 0.179 + 0.475L and W = 0.196 + 0.3163L respectively. The length-total weight, length-wet tissue weight, length-dry tissue weight, length-shell weight, length-dry shell weight relationships were W = 0.1241L2.9066, W = 0.0524L2.7377, W =0.0116L2.7849, W = 0.0533L2.9178 and W = 0.0391L3.0386 respectively. Monthly b values of length-lengths and length-weights relationships indicated a negative allometric growth pattern except length-shell weights relationships which showed an isometric growth of the mussel. This study is the first report on growth pattern of Lamellidens marginalis from Bangladesh and the results would be useful for fishery managers to impose adequate regulations for a sustainable fishery management of this species in the freshwater ecosystem in Bangladesh. J. bio-sci. 27: 121-132, 2019

scholarly journals Ecological Load and Balancing Selection in Circumboreal Barnacles

2020 ◽  
Author(s):  
Joaquin C B Nunez ◽  
Stephen Rong ◽  
Alejandro Damian-Serrano ◽  
John T Burley ◽  
Rebecca G Elyanow ◽  
...  
Keyword(s):  
Environmental Variability ◽  
Balancing Selection ◽  
Spatial Scales ◽  
Functional Variation ◽  
Ion Regulation ◽  
Juvenile Dispersal ◽  
Acorn Barnacle ◽  
The Pacific ◽  
Complex Population ◽  
The Face

Abstract Acorn barnacle adults experience environmental heterogeneity at various spatial scales of their circumboreal habitat, raising the question of how adaptation to high environmental variability is maintained in the face of strong juvenile dispersal and mortality. Here, we show that 4% of genes in the barnacle genome experience balancing selection across the entire range of the species. Many of these genes harbor mutations maintained across 2 My of evolution between the Pacific and Atlantic oceans. These genes are involved in ion regulation, pain reception, and heat tolerance, functions which are essential in highly variable ecosystems. The data also reveal complex population structure within and between basins, driven by the trans-Arctic interchange and the last glaciation. Divergence between Atlantic and Pacific populations is high, foreshadowing the onset of allopatric speciation, and suggesting that balancing selection is strong enough to maintain functional variation for millions of years in the face of complex demography.

scholarly journals Sustained exponential population growth of grey seals at Sable Island, Nova Scotia

2003 ◽  
Vol 60 (6) ◽  
pp. 1265-1274 ◽  
Author(s):  
W.D Bowen ◽  
J McMillan ◽  
R Mohn
Keyword(s):  
Nova Scotia ◽  
Statistical Model ◽  
Aerial Photography ◽  
Environmental Variability ◽  
Grey Seal ◽  
Confidence Limits ◽  
The World ◽  
The Face ◽  
Exponential Population Growth ◽  
Exponential Population

Abstract Grey seal pup production on Sable Island, Nova Scotia, has been monitored since the early 1960s. We estimated pup production on Sable Island in 1997 using aerial photography with a correction for detection of pups on the imagery and a statistical model to account for the proportion of pups not born at the time of the survey. A total of 20 863 pups were counted on the colour positives. When corrected for the proportion of pups seen on the imagery (0.96) and the proportion of pups born before the survey (east colony 0.94, west colony 0.66), estimated total pup production was 25 400 with approximate 95% confidence limits of 23 500 and 26 900. The 1997 estimate indicates that pup production in this population, now the largest grey seal colony in the world, has been increasing exponentially at an annual rate of 12.8% for four decades in the face of considerable environmental variability.

scholarly journals Sustainability Indicators For Fishery Management In Songkhla Lake, Thailand

2013 ◽  
Vol 17 (4) ◽  
pp. 185
Author(s):  
Narit Doungsuwan ◽  
Chatchai Ratanachai ◽  
Penjai Somgpongchaiyakul ◽  
Prapaporn Sangganjanavanich
Keyword(s):  
Decision Making ◽  
Focus Group ◽  
Fishery Management ◽  
Sustainability Indicators ◽  
Decision Making Process ◽  
Focus Group Discussions ◽  
Group Discussions ◽  
Minimum Number ◽  
Sustainable Fishery ◽  
Songkhla Lake

This paper describes the development of a set of indicators for monitoring sustainable fishery management in Songkhla Lake, Thailand. Data and information for developing these indicators were collected through questionnaires administered to fishermen, interviews of other stakeholders, and focus group discussions among experts. The results revealed ten significant monitoring indicators, which are grouped into four categories - five ecological, one economic, two community, and two legal and institutional. They were selected so as to obtain the minimum number of indicators and to obtain indicators that are understandable, applicable, precise, sensitive, and linked to sustainability. They are expected to provide a useful tool for supporting the decision-making process of relevant organizations and achieving sustainable fishery management in Songkhla Lake.

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