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1.
Open Life Sci ; 19(1): 20220876, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38947770

RESUMO

The common squid, Todarodes pacificus, is an important commercial species that inhabits the northwest Pacific Ocean, particularly the East Japan Sea, the Pacific coast of Japan, and the East China Sea. In this study, we chose 29 individuals from three areas: one type from the Sea of Japan and two types from the East China Sea. A total of 43,529 SNPs were obtained using genotyping-by-sequencing (GBS). Our analyses revealed low genetic diversity and genetic differentiation in each type. Heterozygote deficiency and inbreeding have caused this low level of genetic diversity. Population structure analysis indicated that the three types were genetically similar, which may be attributed to strong gene flow combined with the demographic history events during the last 2 million years. This new GBS application technique provides valuable information for the conservation of marine species genetics and could be useful for the effective management of this resource.

2.
Front Public Health ; 12: 1402780, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38932771

RESUMO

Aim: To explore the association between VPA and weight status in adolescents. Methods: The 2017/2018 Health Behavior in School-aged Children survey (HBSC) targeted children and adolescents aged 11, 13 and 15. A systematic multistage stratified cluster randomized sampling method was used in each participating country. The 2017/2018 survey enrolled over 240,951 adolescents across 45 countries and regions. Frequency of VPA, weight status and confounding factors were collected using a self-reported questionnaire. Results: Compared to daily VPA, less frequent VPA was linked to higher odds of obesity. For example, those who participating in VPA for 4-6 times a week (OR = 1.10, 95% CI = 1.06-1.13), 2-3 times a week (OR = 1.21, 95% CI = 1.17-1.25), or once a week (OR = 1.21, 95% CI = 1.16-1.25) all have higher odds of abnormal weight status. For boys, the frequency of 4-6 times a week (OR = 1.09, 95% CI = 1.04-1.13), 2-3 times a week (OR = 1.22, 95% CI = 1.17-1.27), or once a week (OR = 1.25, 95% CI = 1.19-1.32) were associated with higher odds of abnormal weight status. For girls, those who participating in VPA 4-6 times a week (OR = 1.11, 95% CI = 1.06-1.16), 2-3 times a week (OR = 1.20, 95% CI = 1.14-1.25), or once a week (OR = 1.17, 95% CI = 1.11-1.23) all have higher odds of abnormal weight status (i.e., overweight or obesity). Conclusion: This population-based study suggests that infrequent VPA participation is associated with unhealthy weight status in adolescents compared to their physically active counterparts. Additionally, this association remains consistent in both boys and girls.


Assuntos
Peso Corporal , Exercício Físico , Humanos , Masculino , Feminino , Estudos Transversais , Adolescente , Criança , Inquéritos e Questionários , Obesidade Infantil/epidemiologia , Autorrelato , Comportamentos Relacionados com a Saúde
3.
ACS Appl Mater Interfaces ; 15(33): 39448-39460, 2023 Aug 23.
Artigo em Inglês | MEDLINE | ID: mdl-37527438

RESUMO

It remains a great challenge to develop alternative electrocatalysts with high stability for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, a bifunctional electrocatalyst composed of hollow CoOx (Co3O4/CoO) nanoparticles embedded in lamellar carbon nanofibers is derived from a Co2+-anchored covalent-organic framework. The as-fabricated electrocatalyst (CoOx@NC-800) exhibits a half-wave potential (E1/2) of 0.89 V with ultrahigh long-term stability (100% current retention after 3000 CV cycles). Together with promising OER performance, the CoOx@NC-800 based reversible Zn-air battery displays a small potential gap (0.70 V), superior to that of the commercial 20% Pt/C + RuO2. The density functional theory (DFT) calculations reveal that the remarkable electrocatalytic performance and stability of CoOx@NC-800 are attributed to the optimized adsorption of the *OOH intermediate and reduced free energy of the potential-limiting step. This study establishes the functionalization of COF structure for fabrication of high-performance carbon-based electrocatalysts.

4.
BMC Neurol ; 23(1): 275, 2023 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-37464300

RESUMO

BACKGROUND: Stroke survivors suffer an overall loss of social participation. However, the interventions aiming at improving social participation have not yet been well-established. There is a need to synthesize existing knowledge on clinical interventions aiming at improving social participation among people with stroke. OBJECTIVE: To describe the patterns of intervention that have been applied to stroke survivors to improve social participation and to determine the preliminary effects of these patterns. METHODS: Eight online databases, including Cochrane Library, PubMed, Web of Science, Embase, Medline, CINAHL plus, PsycINFO, and Scoups were searched with predefined search terms from inception to September 22, 2022. References of included articles and previous reviews were also checked to identify additional studies. Two reviewers independently selected eligible studies and extracted data from the included articles. RESULTS: A total of 98 studies were included, of which only 25 studies considered social participation as primary outcome of clinical interventions. The patterns of intervention were various, consisting of exercise-based intervention, occupational therapy, self-management program, and complex intervention. Of the 25 studies, eight studies found a positive effect of relative clinical intervention on social participation for stroke survivors. Of note, the same modality of intervention such as exercise-based intervention and self-management program produced paradoxical conclusion on social participation. CONCLUSION: Exercised-based intervention, occupational therapy, self-management program, and complex intervention were important intervention modalities for the improvement of social participation among stroke survivors. Even though the preliminary effectiveness on social participation seems to be potentially positive, further high-quality researches are still required to reach a consensus to achieve optimal social participation among stroke survivors.


Assuntos
Reabilitação do Acidente Vascular Cerebral , Acidente Vascular Cerebral , Humanos , Participação Social , Acidente Vascular Cerebral/terapia
5.
Food Chem ; 426: 136507, 2023 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-37352712

RESUMO

This work investigated microplastic (MP) pollution in a commercially-important tuna species Katsuwonus pelamis (K. pelamis) from the Eastern Pacific and health implications. 125 MPs were extracted from gills, esophagus, stomachs, intestinal tracts, and muscle of K. pelamis. MPs in the esophagus was the highest, ∼7.6 times higher than that in the gill. Polyester and polyethylene terephthalate (PET) were dominant. Molecular docking implied that PET stabilized the complex via forming 4 new hydrogen bonds that interacted with Arg83, Gln246, Thr267, and Gly268, given that PET can enter glycerol kinase protein active pocket. Metabonomic results suggested that Glycerol 3-phosphate up expressed 1.66 more times that of control groups with no MPs in the muscle. This confirmed that MPs would lie in the glycerol kinase protein active pocket, which triggered menace to K. pelamis. The results provided insights into suggested the potential influence of MPs on the sustainability of fisheries and seafood safety.


Assuntos
Contaminação de Alimentos , Plásticos , Atum , Análise de Alimentos , Medição de Risco , Glicerol Quinase/química , Modelos Moleculares , Estrutura Terciária de Proteína
6.
Artigo em Inglês | MEDLINE | ID: mdl-36865741

RESUMO

Objective: Naringin is a flavonoid derived from Chinese herbs. According to earlier studies, naringin may have the potential to alleviate aging-induced cognitive dysfunction. Therefore, this study attempted to explore the protective effect and underlying mechanism of naringin on aging rats with cognitive dysfunction. Methods: After the construction of a model of aging rats with cognitive dysfunction through subcutaneous injection of D-galactose (D-gal; 150 mg/kg), intragastric administration of naringin (100 mg/kg) was performed for treatment. Behavioral tests, including Morris water maze test (MWM), novel object recognition test (NORT), and fear conditioning test, were used to measure the cognitive function; ELISA and biochemical tests were used to determine the levels of interleukin (IL)-1ß, IL-6, monocyte chemoattractant protein-1 (MCP-1), brain-derived neurotrophic factor (BDNF), nerve growth factor (NGF), malondialdehyde (MDA), and glutathione peroxidase (GSH-Px) in the hippocampus of rats in each group, respectively; H&E staining was used to observe the pathological changes in the hippocampus; Western blot was used to examine the expression of toll-like receptor 4 (TLR4)/NF-κB pathway-related proteins and endoplasmic reticulum (ER) stress-related proteins in the hippocampus. Results: The model was successfully constructed by subcutaneous injection of D-gal (150 mg/kg). The behavioral test results showed that naringin could ameliorate the cognitive dysfunction and alleviate the histopathological damage of hippocampus. Moreover, naringin significantly improve the inflammatory response (the levels of IL-1ß, IL-6, and MCP-1 were decreased), oxidative stress response (MDA level was increased while GSH-Px activity was decreased), and ER stress (the expression of glucose-regulated protein 78 (GRP78), C/-EBP homologous protein (CHOP), and transcription factor 6 (ATF6) expression was downregulated), and increased the levels of neurotrophic factors BDNF and NGF in D-gal rats. Besides, further mechanistic studies revealed the downregulation of naringin on TLR4/NF-κB pathway activity. Conclusion: Naringin may inhibit inflammatory response, oxidative stress, and ER stress by downregulating TLR4/NF-κB pathway activity, thereby improving cognitive dysfunction and alleviating histopathological damage of hippocampus in aging rats. Briefly, naringin is an effective drug for the treatment of cognitive dysfunction.

7.
Sci Total Environ ; 850: 157927, 2022 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-35963405

RESUMO

Commercial fisheries, especially pelagic longline fisheries targeting tuna and/or swordfish, often land silky sharks (Carcharhinus falciformis), which are currently listed as vulnerable by the International Union for Conservation of Nature (IUCN). Due to increasing fishing effort and the fact that they overlap in habitat with target species, the population trend of silky sharks is declining worldwide. Understanding their relationships with environmental variables that lead to their capture by fisheries is critical for their management and conservation. Nevertheless, little is known about their size distribution in relation to environmental variables in the Pacific Ocean. Using data from the Chinese Observer Tuna Longline fishery from 2010 to 2020, this study developed a species distribution model (SDM) to analyze the relationships between silky shark size distribution patterns and environmental variables and spatio-temporal variability at fishing locations. Observed sizes ranged from 36 to 269 cm fork length (FL). The final model suggests that sea surface temperature (SST), primary production (photosynthetically available radiation, PAR), and ocean surface winds were the key environmental variables shaping size distribution patterns of silky sharks in the Pacific. A high proportion of larger silky sharks has been predicted in areas associated with productive upwelling systems. In addition, the model predicted that larger specimens (>140 cm FL) occur near the equator, and smaller specimens farther from the equator but still in tropical regions. Two regions in the eastern Pacific (the coastal upwelling area off northern Peru and the waters around the Galapagos Islands) seem to be important locations for larger specimens. The size distribution patterns of silky sharks in relation to environmental variables presented in this study illustrate how this species segregates spatially and temporally and presents potential habitat preference areas. The information obtained in the present study is critical in the quest for management and conservation of menaced species such as the silky shark.


Assuntos
Conservação dos Recursos Naturais , Tubarões , Animais , Pesqueiros , Oceano Pacífico , Atum
8.
Environ Pollut ; 309: 119751, 2022 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-35835271

RESUMO

The silky shark Carcharhinus falciformis is a large pelagic species distributed in the global oceans and was recently listed as "Vulnerable" by the IUCN because of its decline in population due to overfishing. As an apex predator, the silky shark can accumulate elevated quantities of mercury (Hg), posing a potential risk to its remaining population. In this study, total Hg (THg) concentrations were determined in silky shark muscle, liver, dermis, red blood cells (RBC) and plasma sampled from the eastern tropical Pacific, and δ15N values were measured to explore the influence of feeding ecology on Hg accumulation. The highest THg concentrations were in muscle (7.81 ± 6.70 µg g-1 dry weight (dw) or 2.14 ± 1.83 µg g-1 wet weight (ww)) and liver (7.88 ± 10.22 µg g-1 dw or 4.66 ± 6.04 µg g-1 ww) rather than dermis, RBC and plasma. The THg concentrations in all tissue types were significantly correlated with fork length and showed faster accumulation rates after maturity. Maternal THg transfer was observed in silky sharks with embryos having 33.16% and 1.98% in muscle and liver compared with their respective mothers. The potentially harmful THg concentrations in silky shark tissues and embryos may lead to health problems of sharks and consumers. THg concentrations were negatively correlated with δ15N values for all tissues, indicating likely baseline variations in δ15N values that reflect changes in the foraging habitats or regions of silky sharks with size or age. Lastly, strong correlations were observed among THg concentrations of all tissue types, indicating that nonlethal sampling of muscle and dermis tissue can be used effectively to quantify THg concentration of other internal tissues.


Assuntos
Mercúrio , Tubarões , Poluentes Químicos da Água , Animais , Tamanho Corporal , Conservação dos Recursos Naturais , Monitoramento Ambiental , Pesqueiros , Mercúrio/análise , Poluentes Químicos da Água/análise
9.
Ying Yong Sheng Tai Xue Bao ; 32(6): 2014-2020, 2021 Jun.
Artigo em Chinês | MEDLINE | ID: mdl-34212606

RESUMO

Stable carbon and nitrogen isotope ratios (δ13C and δ15N, respectively) of multiple tissues with different turnover rates can provide trophic information at different timescales, and thus play an important role in tracing the changes of feeding, habitat utilization and trophic niche of consumers. The δ13C and δ15N contents of muscle, liver and blood of blue sharks (Prionace glauca), longfin mako sharks (Isurus paucus), crocodile sharks (Pseudocarcharias kamoharai) and shortfin mako sharks (I. oxyrinchus) from tropical Atlantic were measured, and the trophic niche was evalua-ted. The results showed that I. oxyrinchus, P. kamoharai, and P. glauca had similar δ15N values, higher than that of I. paucus. Feeding segregation was found between P. glauca and other species, showing unique trophic niche. The largest trophic niche width was observed in I. oxyrinchus, indicating the high diversity of prey and (or) feeding habitats. High trophic niche overlap was found in P. kamoharai and I. oxyrinchus, implying their potential competition for resources. There was no correlation between the differences among tissues in the δ13C or δ15N values and the body size of I. oxyrinchus, P. kamoharai and P. glauca, indicating no recent diet shifts for those species. I. paucus showed significant correlation between δ15N differences in liver, blood and muscle with the shark fork length, indicating its short-term diet shift. The similarity of δ13C and δ15N values and the higher metabolic rates of liver and blood were found in all four shark species, implying the similar incorporation rates of both tissues, which were considered as the short-term indicator of diet.


Assuntos
Tubarões , Animais , Tamanho Corporal , Isótopos de Carbono , Ecossistema , Isótopos de Nitrogênio/análise
10.
Environ Sci Pollut Res Int ; 28(10): 12628-12639, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33085010

RESUMO

This paper evaluates the performance of different observer coverage rates and 9 possible sampling designs to estimate via computer simulation the total catch of target and non-target species for Chinese tuna longline fisheries in the Pacific Ocean. The stratified random samplings include different stratification schemes (based on target species or fishing areas) with different strategies for allocating observers. The observer data from 103 vessels between 2010 and 2019 were assumed to be the "true" sampling population. We concluded that the accuracy of catch estimates had a significant positive relationship with species detectability and observer coverage rate. On average, the accuracy improved by 50% when the coverage rate increases from 5 to 20%. Current simple random sampling in Chinese tuna longline fisheries is less efficient for monitoring many species. Stratified sampling designs based on the target species tended to yield the most accurate estimates of the total catch. Allocating the observers based on the scale of the fleets in different stratum seemed to be less efficient. The proportion of observers between different fleets should be adjusted according to different monitoring objectives. In general, a large proportion of observers are recommended to be allocated onboard vessels targeting bigeye tuna (Thunnus obesus). This study has the potential to have a significant contribution to future designs of the observer monitoring programs in Chinese tuna longline fishery and many other fisheries.


Assuntos
Pesqueiros , Atum , Animais , China , Simulação por Computador , Oceano Pacífico
11.
J Fish Biol ; 97(6): 1651-1661, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-32892380

RESUMO

This study used data provided by the Chinese Longline Fishery Scientific Observer Programme from the tropical eastern Atlantic Ocean to estimate the reproductive parameters of the blue shark (Prionace glauca) and crocodile shark (Pseudocarcharias kamoharai). Sizes ranged from 80 to 298 cm fork length (FL) for blue sharks and from 48 to 99 cm FL for crocodile sharks. Sexual segregation was observed during different months for both sharks. The sex ratio for blue sharks was 1.38 F:1 M, and 1 F:2.79 M for crocodile sharks. The size of adult blue sharks ranged from 144 to 280 cm for males and from 174 to 298 cm for females; and that of crocodile sharks from 63 to 97 cm for males and 78-99 cm for females. The size at 50% of maturity for blue sharks was estimated at 191.7 cm FL for females and 197.5 cm FL for males, and that of crocodile sharks was assessed at 84.9 cm FL for females and 78.5 cm FL for males. Most sexually matured females were pregnant; their means were 207.2 ± 16.4 cm FL for blue sharks and 89.4 ± 4.3 cm FL for crocodile sharks. Mature sizes for both species were significantly different among months. Embryonic sizes also varied widely among months for crocodile sharks, but a slight change was recorded for those of blue sharks. The observed mean size at birth and litter size were 34.5 cm FL and 37 ± 12 for the blue sharks, and that of the crocodile sharks, 39.5 cm FL and a dominant four embryos in the uterus. Due to the observed increasing catch trend of blue sharks and the slow reproductive cycle of crocodile sharks, this study presents the need of implementing conservation measures to ensure the sustainability of both species in their habitat.


Assuntos
Reprodução/fisiologia , Tubarões/fisiologia , Animais , Oceano Atlântico , Tamanho Corporal/fisiologia , Conservação dos Recursos Naturais , Ecossistema , Feminino , Masculino , Razão de Masculinidade , Maturidade Sexual/fisiologia , Especificidade da Espécie
12.
Environ Sci Pollut Res Int ; 27(20): 25461-25474, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32350839

RESUMO

The present study used multivariate techniques, to analyze the fish species diversity and distribution patterns in order to determine the possible role of environmental parameters as drivers of fish community structure and composition in the Yangtze River Estuary (YRE). This analysis was conducted using data obtained in the YRE from February 2012 to December 2014. Analysis of the catch data showed that species composition, total density, and total biomass varied significantly between stations and seasons. Thirty-eight species belonging to 18 families were collected. Sciaenidae was the most dominant family accounting for 40.8% of total captured specimens. In descending order, Collichthys lucidus, Cynoglossus gracilis, Chaeturichthys stigmatias, and Lophiogobius ocellicauda dominated catches in the YRE. These four species constituted 64.2% of the total catches and showed average dissimilarities of 74.19% between stations and 81.3% between months. The highest number of fish specimens captured was recorded in August 2012 while the highest species richness was observed in December 2013. The mean fish density and biomass for the YRE was 0.35 individuals/m2 and 2.5 g/m2, respectively. The mean density and biomass for the most important and dominant species changed significantly between stations and seasons. Canonical correspondence analysis indicated that salinity and chlorophyll-a were the key variables that structured the fish assemblage in the YRE. High total species density and biomass were recorded in high saline stations (North Branch) of the YRE. This study confirms that most species captured in the YRE needs estuarine conditions to complete their growth and development. Hence, the findings in this study are important to understanding and developing suitable conservation plans for the management of fish resources in the YRE.


Assuntos
Estuários , Rios , Animais , Biomassa , Ecossistema , Peixes , Estações do Ano
13.
Environ Sci Pollut Res Int ; 26(16): 15894-15904, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30963434

RESUMO

Management procedures (MPs) based on data-limited methods (DLMs) recently developed to give management advices for data-limited stocks worldwide are scarce or yet to be implemented on freshwater species. In this study, case studies (CSs) were developed using length-frequency data (LFD) of common carp species harvested from Dianshan Lake to estimate life-history parameters from existing methods. These CSs were later used to examine their influences when tested with various MPs under scenarios when operating models (OMs) were subjected to observation and estimation uncertainties. The results after management strategy evaluation (MSE) was run for various defined OMs showed that three MPs emerged best for providing managing advice. For high yield to be maintained during short-term periods, MinlenLopt1 suggested the smallest length at full retention (sLFR) to be 42.11 cm; while Slotlim and matlenlim2 suggested that to maintain biomass and stable spawning biomass (SBMSY) and also avoid overfishing from occurring in this fishery, sLFR should be 56.1 cm. Values given by these MPs allowed the removal of species that spawned at least once. Also, life-history parameters derived from CS4 presented the best results, being more reliable in presenting better inputs for effective management of the said fishery.


Assuntos
Carpas/fisiologia , Pesqueiros/organização & administração , Animais , Biomassa , China , Conservação dos Recursos Naturais/métodos , Lagos , Modelos Teóricos , Dinâmica Populacional , Incerteza
14.
Ying Yong Sheng Tai Xue Bao ; 30(2): 644-652, 2019 Feb 20.
Artigo em Chinês | MEDLINE | ID: mdl-30915817

RESUMO

Yangtze River Estuary is the biggest estuarine ecosystem in the western Pacific Ocean. Evaluating fish community in this ecosystem can provide scientific basis for its restoration and mana-gement. Generalized additive model (GAM) and boosted regression tree (BRT) were built to examine the relationship between fish community diversity and environmental and spatio-temporal variables based on data collected during 2012-2014. Combined with linear regression analysis, a cross validation was used to evaluate the fitness and predictive performance of both models. We plotted the spatial distribution of fish community diversity and richness in each station of the Yangtze River Estuary in 2014. The results showed that salinity, pH and chlorophyll-a had the most contribution on diversity, while pH, dissolved oxygen and chlorophyll-a were the most contributive variables on richness. BRT models showed better fitness and lower prediction error than GAM models. In contrast to GAM models, BRT models could distinguish the fish community index in each station area with respect to the spatial prediction. The diversity index in external water was obviously greater than that in internal water. Meanwhile, the station at higher latitude had a higher diversity index in both external and internal water.


Assuntos
Rios , Animais , China , Estuários , Peixes , Oceano Pacífico
15.
Mitochondrial DNA A DNA Mapp Seq Anal ; 28(4): 575-578, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-27159690

RESUMO

Six hundred and ninety-seven base pairs of cytochrome b gene of mtDNA was sequenced and analyzed for 78 blue shark Prionace glauca individuals from three sampled locations in the central Pacific Ocean (CPO). In total, three polymorphic sites were detected which defined four haplotypes. The haplotype diversity (h) ranged from 0.517 to 0.768, and nucleotide diversity (π) was between 0.0007 and 0.0011. Analysis of molecular variance indicated a non-significant differentiation among subpopulations. Furthermore, pairwise FST score analysis revealed a non-significant differentiation among three sampled regions. Generally, low genetic differences were found between different geographic locations in the CPO. This study suggests a single panmictic population of P. glauca in the CPO.


Assuntos
Citocromos b/genética , Código de Barras de DNA Taxonômico/métodos , Tubarões/classificação , Animais , DNA Mitocondrial/genética , Proteínas de Peixes/genética , Haplótipos , Oceano Pacífico , Filogenia , Polimorfismo de Nucleotídeo Único , Tubarões/genética
16.
Artigo em Inglês | MEDLINE | ID: mdl-26680236

RESUMO

Toxabramis swinhonis is a one of the main bycatch species in China's freshwater fishery and an important food resource for the larger fishes in the main rivers and lakes in China. For better understanding the biology of this species, the complete mitochondrial genome of Toxabramis swinhonis was determined and analyzed in this study. The complete mitogenome of T. swinhonis is 16 622 bp in length, which contains 22 transfer RNAs, 2 ribosomal RNAs, 13 protein-coding genes and 2 non-coding regions: origin of light-strand replication (OL) and control region (D-loop). The determination of T. swinhonis mitogenome would play an important role in genetic diversity and evolution for Cyprinidae.


Assuntos
Cyprinidae/genética , Genes Mitocondriais , Genoma Mitocondrial , Filogenia , Animais , Sequência de Bases , China , DNA Mitocondrial , Variação Genética , Genômica , Análise de Sequência de DNA
17.
Ying Yong Sheng Tai Xue Bao ; 27(2): 622-8, 2016 Feb.
Artigo em Chinês | MEDLINE | ID: mdl-27396138

RESUMO

The blue shark, Prionace glauca, is the main by-catch species in tuna longline fishery. As one of top species in the oceanic food webs, the blue shark plays an important role in the marine ecosystem. Traditional stock assessment methods are difficult to accurately evaluate the population dynamic for this shark because of limited data. Based on life-history parameters of the blue shark in the North Atlantic, demographic analysis was employed to estimate the demographic parameters and evaluate the potential exploitation for the blue shark. Moreover, we discussed the relationship between age at first capture and critical value of fishing mortality corresponding to the value of intrinsic rate of natural increase 0. The results showed that the survival rate (S) of blue shark from 0.719 to 0.820, intrinsic rate of natural increase (r0) from 0.250 to 0.381, time of population doubling (tx2) from 1.819 to 2.773 years, reproduction rate per generation (R0) from 6.600 to 22.255, and generation time (G) from 8.498 to 10.162 years. The sensitivity analysis for the life history parameters revealed that the uncertainties of natural mortality existed in the first age class, age at maturity and maximum age had slight influence on the demographic parameters. Fishing mortality (Fc) increased with the age at first capture. When the age at first capture (tc) was more than five, there was no obvious relationship between Fc and tc.


Assuntos
Conservação dos Recursos Naturais , Tubarões , Animais , Oceano Atlântico , Ecossistema , Pesqueiros , Cadeia Alimentar , Densidade Demográfica , Crescimento Demográfico
18.
Mitochondrial DNA A DNA Mapp Seq Anal ; 27(5): 3481-2, 2016 09.
Artigo em Inglês | MEDLINE | ID: mdl-26258504

RESUMO

The complete mitogenome sequence of Taractichthys steindachneri was sequenced and analyzed in this study. The complete mitogenome of T. steindachneri is 16 723 bp in length, which contains 22 transfer RNAs, 2 ribosomal RNAs, 13 protein-coding genes and 2 non-coding region, a rep region and a control region (D-loop). This study will be useful for studying on the molecular systematic, taxonomic status and conservation genetics.


Assuntos
Mitocôndrias/genética , Perciformes/genética , Análise de Sequência de DNA/métodos , Animais , Composição de Bases , Tamanho do Genoma , Genoma Mitocondrial , Perciformes/classificação , Filogenia
19.
Mitochondrial DNA A DNA Mapp Seq Anal ; 27(4): 2809-10, 2016 07.
Artigo em Inglês | MEDLINE | ID: mdl-26258509

RESUMO

Taractes rubescens is a high vulnerable species which widely distributes in tropical and subtropical water in Pacific and Atlantic Ocean. The complete mitogenome sequence of T. rubescens was determined in this study. The complete mitogenome of T. rubescensis 16 720 bp in length, which contains 13 protein-coding genes, 22 transfer RNAs, 2 ribosomal RNAs and a control region (D-loop). Furthermore, base composition of A, C, G and T is estimated to be 27.6%, 30.9%, 15.8% and 25.7%, respectively. The complete mtDNA sequence of T. rubescens provides a useful data for studying on the molecular systematic, stock assessment and conservation genetics.


Assuntos
DNA Mitocondrial/genética , Genoma Mitocondrial/genética , Perciformes/genética , Animais , Composição de Bases/genética , RNA de Transferência/genética , Análise de Sequência de DNA
20.
Mitochondrial DNA A DNA Mapp Seq Anal ; 27(6): 4338-4339, 2016 11.
Artigo em Inglês | MEDLINE | ID: mdl-26465980

RESUMO

Hemiculter bleekeri bleekeri is a typical freshwater species that are mainly distributed in the river basins in China. The biological information of this species is very limited. In this study, we determined the complete mitogenome sequence of H. bleekeri bleekeri. The complete mitogenome of H. bleekeri bleekeri is 16 6173 bp in length, which contains 22 transfer RNAs, 2 ribosomal RNAs, 13 protein-coding genes and 2 non-coding region, a rep region (33 bp) and a control region (D-loop). This work provides new information which is helpful for comprehending the molecular systematic, taxonomic status and evolutionary biology of this species.


Assuntos
Cyprinidae/genética , DNA Mitocondrial/genética , Genoma Mitocondrial/genética , Animais , Composição de Bases/genética , Sequência de Bases/genética , Evolução Biológica , China , Água Doce , Genes Mitocondriais/genética , Genoma/genética , Mitocôndrias/genética , Filogenia , Rios , Análise de Sequência de DNA/métodos
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