Modelling the impacts of environmental variation on habitat suitability for Pacific saury in the Northwestern Pacific Ocean     

Yi‐Jay Chang  Kuo‐Wei Lan  William A. Walsh  Jhen Hsu  Chih‐hao Hsieh 《Fisheries Oceanography》2019,28(3):291-304

We developed habitat suitability index (HSI) models for two size classes of Pacific saury Cololabis saira in the Northwestern Pacific Ocean. Environmental data, including sea surface temperature, sea surface height, salinity, and net primary production, and catch and effort data from Taiwanese distant‐water stick‐held dip net fisheries during the main fishing season (August–October) during 2002–2015 were used. Habitat preferences and suitable habitat area differed between size classes. The suitable habitat was located between 40–47.5°N and 145–165°E for large‐sized Pacific saury but encompassed a greater area (35–47°N and 140–165°E) for medium‐sized Pacific saury. Both size classes were affected by substantial interannual variation in the environmental variables, which in turn can be important in determining the potential fishing grounds. We found a significant negative relationship between the suitable habitat area and the Niño3.4 indices with a time‐lag of 6 months for the large‐sized (r = ?0.68) and medium‐sized (r = ?0.42) Pacific saury, respectively, as well as the total landings of Pacific saury by all fishing fleets (r = ?0.46). As remotely‐sensed environmental data become increasingly available, HSI models may prove useful for evaluation of possible changes in habitat suitability resulting from climate change or other environmental phenomena and in formulating scientific advice for management.  相似文献   

Effects of structure design on resilience and acoustic absorption properties of porous flexible-foam based perforated composites     

Ching-Wen Lou  Shih-Yu Huang  Chen-Hung Huang  Yi-Jun Pan  Ruosi Yan  Chien-Teng Hsieh  Jia-Horng Lin 《Fibers and Polymers》2015,16(12):2652-2662

In this paper, perforated composite panel was combined with porous and resonance structures to investigate the influence on acoustic absorption and resilient properties. The perforated composite panel was fabricated based on highdensity flexible-foam via perforating and reinforcing with laminated hybrid nonwoven fabric. Effect of aperture size (AS) (ranging from 3 mm to 6 mm), perforation ratio (PR) (5 %, 10 %, 15 % and 20 %) and perforation depth (PD) (25 %, 50 %, 75 % and 100 %) on the compressive hardness, rebound resilience and acoustic absorption properties was explored. Multiply hybrid nonwoven fabric which was fabricated with low-melting point polyester (LMPET), flame-retardant polyester (FRPET) and recycled Kevlar fibers was utilized to reinforce the flexible composites and improve the acoustic property. Nonwoven that was fabricated with entangled LMPET fibers had porous structures which could reinforce the flexible foam and enhance the acoustic absorption properties. The result revealed that the continuity and supporting of porous flexible foam had directly influence the compressive hardness. The maximum hardness of the flexible-foam based perforated composites reached 420 N. The rebound resilience result showed that the sample had high resilient structure and the resilience was up to 48 %. The perforated flexible composites plate (PFP) with 4 mm-AS performed the highest acoustic absorption coefficient at 0.9. The acoustic absorption coefficient was higher than 0.8 in the frequency range from 800 to 1600 Hz and 1600 to 2400 Hz when perforated composites had 4 mm-AS at 5 % and 10 % perforation ratio. With the increase in perforation ratio, absorption peak moved from 3200 Hz to 4000 Hz. Hybrid nonwoven laminated layer help to broaden the frequency range of acoustic absorption of perforated high-density flexible foam based composites panel. Acoustic absorption coefficient was higher than 0.4 when frequency ranging from 900 Hz to 4000 Hz.  相似文献   

A spatial aggregation index for effective fallow decision in paddy irrigation demand planning     

Ming-Daw Su  Mei-Chun Lin  Chun-Hung Lin  Shih-Fu Wang  Tzai-Hung Wen  Hsin-I Hsieh 《Paddy and Water Environment》2012,10(1):31-39

As irrigation demands usually take the largest share of water supply, paddy fallow is considered as a drought relieving measure in some Asian paddy growing countries by transferring the water saved to the municipal and industrial sectors. But the relationship between fallow area and irrigation demand reduction is not necessarily linear, there may be more than dozens combinations of fallow farm that can meet the same amount of irrigation demand reduction requirement. The Joint Count Statistics (JCS), an index commonly used in spatial analysis to measure the spatial coherence among cells was modified as a spatial aggregation index for evaluating the irrigation demand reduction effectiveness from a spatial perspective. This Modified JCS is supposed to identify the degree of spatial aggregation by taking underlying irrigation network into considerations. The modified JCS was proved to be effective to identify better fallow pattern through a case study in Taiwan.  相似文献   

Three New Cembranoids from the Taiwanese Soft Coral Sarcophyton ehrenbergi     

SK Wang  MK Hsieh  CY Duh 《Marine drugs》2012,10(7):1433-1444

In order to search for new bioactive substances from marine organisms, we have investigated the acetone extracts of the soft coral Sarcophyton ehrenbergi collected at San-Hsian-Tai, Taitong County, Taiwan. Chromatographic fractionation of the extracts of the octocoral S. ehrenbergi led to the isolation of three new cembranoids, (+)-12-ethoxycarbonyl-11Z-sarcophine (1), ehrenbergol A and B (2 and 3). The structures of these isolated metabolites were elucidated through extensive spectroscopic analyses. Moreover, metabolites 1-3 were evaluated in vitro for their cytotoxicity towards selected cancer cell lines and antiviral activity against human cytomegalovirus (HCMV).  相似文献   

Affinity isolation and mass spectral analysis of 1,10-phenanthroline (OP)-stimulated UV-damaged-DNA binding proteins expressed in zebrafish (Danio rerio) embryos     

Lai YS  Hsieh FJ  Hsu T 《Fish physiology and biochemistry》2012,38(4):1117-1129

Our earlier studies indicated the high expression of a UV-damaged-DNA binding activity in zebrafish (Danio rerio) embryos at 12?h postfertilization (hpf). Two 30- to 35-kDa polypeptides homologous to the N-terminal lipovitellin 1 (Lv1) domain of the 150-kDa zebrafish vitellogenin 1 (zfVg1) were identified as the damage recognition factors in zebrafish extracts, and the metal-chelating agent 1,10-phenanthroline (OP) was found to inhibit the embryonic UV-damaged-DNA binding activity. This study further explored the DNA damage-sensing components in 12 hpf zebrafish extracts. UV-damaged-DNA binding proteins were enriched from zebrafish extracts by isoelectrofocusing. Both OP-sensitive and OP-stimulated, UV-damaged-DNA binding activities were detected in fractionated zebrafish extracts. Two-dimensional gel electrophoresis of proteins captured by an immobilized oligonucleotide carrying a UV-induced (6-4)photoproduct (6-4PP) revealed a 25-kDa polypeptide as the major 6-4PP-binding factor in an OP-stimulated fraction. Three 25-kDa factors that bound weakly to 6-4PPs were also isolated. The four polypeptides having pIs between 7.0 and 7.3 were unreactive to an anti-zfVg1 antibody targeting the Lv1 domain. Mass spectral analysis showed the appearance of amino acid sequences LPIIVTTYAK and IPEITMSK in all 25-kDa polypeptides and sequences exactly matching those contained in the four factors exist only in the C-terminal Lv2 domain of zfVg1, reflecting the origination of these factors from enzymatic cleavage of the Lv2 domain at slightly different positions. The OP-stimulated fraction produced a much stronger UV-dependent DNA incision activity in the presence than in the absence of OP, suggesting the association of these factors with DNA damage repair under metal-deficient conditions.  相似文献   

Effects of climate on temporal variation in the abundance and distribution of the demersal fish assemblage in the Tsushima Warm Current region of the Japan Sea          下载免费PDF全文

Chen‐Yi Tu  Yongjun Tian  Chih‐Hao Hsieh 《Fisheries Oceanography》2015,24(2):177-189

In the present study, we examined the effects of climate on temporal variation in the abundance and geographical distribution of demersal fishes at both interannual and decadal scales in the Tsushima Warm Current region of the Japan Sea using single‐trawler fishery data (1972–2002). This single‐trawler fishery targeted multiple species with different geographical affinities and life history traits. Thus, these data were suitable for examining the biological mechanisms that underlie how species respond to climate variability. Our results indicate that the distributional changes of species in response to decadal climate variability are best explained by asymptotic length, which indicates that warming has greater negative effects on larger fishes in the Japan Sea. However, none of the variables examined (including geographical affinity, asymptotic length and age at maturation) could explain the shift in abundance at interannual or decadal scales. It should be noted that life history traits and geographical affinities only provide partial explanations of the responses of species to environmental variability, thereby suggesting that other factors, such as interactions among species, may be involved in mediating species responses.  相似文献   

Real-Time Soil CO2 Respiration Rate Determination and the Comparison between the Infrared Gas Analyzer and Microrespirometer (MicroRes®) Methods     

Andrew Sparda  Robert O. Miller  Yuch-Ping Hsieh 《Communications in Soil Science and Plant Analysis》2017,48(2):214-221

Soil carbon dioxide (CO₂) respiration is one of the important soil health parameters that provides a general assessment of soil microbial activity and soil quality. Soil respiration rates, however, have not been widely applied in soil testing protocols mainly because the traditional methods are either inconvenient, technically cumbersome or too expensive. Currently, only two methods are available for a true real-time soil respiration rate determination (<2 h): the infrared gas analyzer (IRGA) and the microrespirometer (MR or MicroRes^®) methods. We analyzed the real-time soil respiration rates of 20 soil samples from fifteen states after various periods of incubation using the IRGA method and the MR method. The measured soil respiration rates ranged from 0.4 µL CO₂/h/g to 9.0 µL CO₂/h/g. Both methods show precision in soil respiration determinations (CV = 12.7% and 11.9%, respectively). Comparison of the results between the IRGA and MR methods indicates high degrees of agreement (r² = 0.914). This study shows that the MR method is a simpler and more cost-effective alternative for real-time soil respiration rate determinations.  相似文献   

Manufacture technique and electrical properties evaluation of bamboo charcoal polyester/stainless steel complex yarn and knitted fabrics   总被引：1，自引：0，他引：1  

Jia-Horng Lin  An-Pang Chen  Chin-Mei Lin  Ching-Wen Lin  Chien-Teng Hsieh  Ching-Wen Lou 《Fibers and Polymers》2010,11(6):856-860

There are derivative problems of electromagnetic wave radiation accompanying the advances of science and technology nowadays and secure protections are also emphasized gradually. To shield these electromagnetic wave radition jeopardizing people’s health, in this study, stainless steel wires were the core yarn and bamboo charcoal polyester textured yarns were the wrapped yarn. The bamboo charcoal polyester/stainless steel (BC/SS) complex yarns were manufactured using a rotor twister machine. The BC/SS complex knitted fabrics were woven with the complex yarns employing a circular knitting machine. Three manufacture parameters were the wrapped amount of the complex yarn (2 to 6 turns/cm), the lamination amount of the knitted fabrics (1 to 6 layers) and lamination angles of the knitted fabrics (0°/0°/0°/0°/0°/0°, 0°/45°/90°/−45°/0°/45°, and 0°/90°/0°/90°/0°/90°). The knitted fabric exhibited the lowest surface resistance 32.3 Ω/sq. Optimum electromagnetic shielding effectiveness (EMSE) was 45 dB when the knitted fabrics were with 0°/45°/90°/−45°/0°/45° laminating in 0.51 GHz.  相似文献   

Spread of seed-borne <Emphasis Type="Italic">Erwinia rhapontici</Emphasis> in bean,pea and wheat     

Ting-Fang Hsieh  Hung-Chang Huang  R. Scott Erickson 《European journal of plant pathology / European Foundation for Plant Pathology》2010,127(4):579-584

Studies were conducted in the laboratory and greenhouse to determine the distribution of Erwinia rhapontici in plants arising from naturally infected seeds of pea or artificially inoculated seeds of bean and wheat, and whether the pathogen is transmitted to the subsequent generation of seeds. Infected seeds were planted in pots of Cornell mix in the greenhouse, and sampled at specified intervals throughout the plant growth cycle (seedling stage, elongation stage, flowering stage, seed formation stage, and maturity). Plating of surface sterilized lateral roots, tap roots, basal stems, mid-stems, apical stems, petioles, pods, and seeds of pea and bean, and of lateral roots, sub-crown internodes, basal stems, mid-stems, apical stems, peduncles, glumes, and seeds of wheat revealed that the bacterial pathogen spread from infected seeds to the lower parts of the plant tissues, but failed to spread further to the seeds produced on these plants. The study concludes that E. rhapontici did not establish systemic infection throughout the plants. Possible mechanisms of infection of seeds are discussed.  相似文献   

Ameliorative Effects of Melatonin against Hydrogen Peroxide‐Induced Oxidative Stress on Boar Sperm Characteristics and Subsequent In Vitro Embryo Development     

HY Jang  YH Kim  BW Kim  IC Park  HT Cheong  JT Kim  CK Park  HS Kong  HK Lee  BK Yang 《Reproduction in domestic animals》2010,45(6):943-950

Melatonin, the major secretory product of the pineal gland, scavenges a variety of reactive oxygen and nitrogen species in vivo and in vitro, indicating that melatonin is a potent function as an antioxidant. The objective of this study was to investigate the effect of melatonin in the presence or absence of hydrogen peroxide (H₂O₂) on sperm characteristics (motility, viability, survival rate, membrane integrity, lipid peroxidation (LPO) and mitochondria activity) and also to examine the developmental rates to the blastocysts stage of porcine oocytes fertilized in vitro with semen treated with or without melatonin (100 nm ) in the presence or absence of H₂O₂ (250 μm ). The sperm were treated with melatonin in the presence or absence of H₂O₂ for 3, 6, 9 and 12 h at 37°C and then analysed for the sperm characteristics. The porcine embryos were produced by in vitro maturation and in vitro fertilization (IVM/IVF) using semen treated with or without melatonin (100 nm ) in the presence or absence of H₂O₂ (250 μm ) for 6 h. The semen characteristics, including motility, viability, survival rate, membrane integrity and mitochondria activity, were higher in the groups that were treated with melatonin in comparison to other groups, irrespective of incubation periods. Malondialdehyde levels in control, melatonin and melatonin + H₂O₂ groups were lower than H₂O₂ only group. A positive correlation was shown among motility, viability, survival rate and membrane integrity, but a negative correlation was observed between LPO and the other evaluation methods. The developmental rates to blastocysts of IVM/IVF porcine oocytes fertilized by semen treated with melatonin were significantly increased compared with any other groups, with the cell number of blastocysts shown to have a similar trend to the developmental rates. These results demonstrate that melatonin can improve the semen characteristics during in vitro storage and support the developmental ability of IVM/IVF embryos in pigs.  相似文献