Analysis of single nucleotide polymorphisms (SNPs) associated with antibiotic resistance genes in Chilean Piscirickettsia salmonis strains     

Jaime Figueroa  Diana Castro  Fernando Lagos  Carlos Cartes  Adolfo Isla  Alejandro J. Yez  Rubn Avendao‐Herrera  Denise Haussmann 《Journal of fish diseases》2019,42(12):1645-1655

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Juan Carlos Prez‐Rodríguez  Jaime Gmez‐Gutirrez  Laura Susana Lpez‐Greco  Edilmar Corts‐Jacinto 《Aquaculture Research》2019,50(11):i-i

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Insights into the horizontal movements,migration patterns,and stock affiliation of California swordfish     

Chugey A. Sepulveda  Michael Wang  Scott A. Aalbers  Jaime R. Alvarado-Bremer 《Fisheries Oceanography》2020,29(2):152-168

This study reports on the horizontal movements of swordfish (Xiphias gladius L.) tagged during deep‐set fishery trials off the California coastline. Position estimates from several electronic tag types were used to better understand swordfish stock structure and regional affiliation with current boundary hypotheses used to manage swordfish in the eastern north Pacific. Swordfish were outfitted with (a) satellite‐linked mark–recapture tags (n = 66), (b) electronic data storage tags that were recaptured (n = 16), (c) fin‐mounted Argos transmitters (n = 6), and (d) satellite‐linked archival tags (n = 4). Twenty‐six percent of tagged swordfish reported close to (<225 km) their deployment location within the southern California Bight (SCB). Of the 50 swordfish that moved outside the SCB, 76% exhibited affiliation to the Eastern Pacific Ocean (EPO) management unit, 20% moved into the Western and Central North Pacific (WCNP) and 4% spent time within both the EPO and WCNP boundaries. Mean displacement between deployment and reporting locations was 1,250 ± 1,375 km, with daily rates of movement up to 55 km/day. Seasonal migrations ranged from the equator (0.8°N.132.4°W) to the Hawaiian Islands (17.0°N/154.2°W), with multiple individuals returning to the initial tagging locations the subsequent season. Seasonal site fidelity exhibited by several individuals highlights the importance of the SCB foraging grounds. While no evidence of trans‐equatorial or trans‐Pacific crossing was documented, extensive movements validate the highly migratory nature of California swordfish and support the need for future inclusion of spatial distribution data in management. Findings suggest that SCB swordfish may exhibit a higher level of EPO connectivity than previously proposed.  相似文献   

DNA fragmentation in blue mussel (Mytilus edulis) sperm: aquaculture and fisheries implications          下载免费PDF全文

Michael E Kjelland  Carmen López‐Fernández  Cuca Perez‐García  Jaime Gosálvez 《Aquaculture Research》2017,48(6):2973-2980

The objective of this study was to assess sperm DNA longevity in blue mussels (Mytilus edulis) using a dynamic assessment of sperm DNA fragmentation (SDF) after sperm activation. Mature blue mussels (n = 57) in Vigo (Galicia, Spain) were obtained, specifically rope farmed blue mussels (n = 38) and wild blue mussels (n = 19). After the sperm collection, a subsample was assessed for SDF (0 h), while the rest of the sample was incubated for 6, 9, 12, 24 and 48 h at 15°C, assessing each time point using the Sperm‐Halomax kit (Halotech DNA, Madrid, Spain). The Kaplan–Meier estimator, log‐rank (Mantel–Cox) test and Mann–Whitney U‐test were used for statistical analyses (spss v. 16.0), α = 0.05. The rate of SDF (r‐SDF) between rope farmed and wild blue mussels over 0–6 h incubation was not significantly different (P = 0.278), but was for 6–24 h (P = 0.004). Differences in r‐SDF were observed when comparing the means between the two groups (P < 0.0001). Individual differences in r‐SDF existed among the rope farmed (P < 0.0001) and wild blue mussels (P < 0.0001). Wild blue mussels presented a higher DNA longevity than the farmed blue mussels. Selection of blue mussel males with a low level of sperm DNA damage and greater sperm DNA longevity may result in better fertilization and seed production.  相似文献   

Genetic Diversity and Wolbachia (Rickettsiales: Anaplasmataceae) Prevalence Within a Remnant Population of Regal Fritillary,Argynnis idalia (Lepidoptera: Nymphalidae), in South-Central Pennsylvania     

Ilga Rutins  Sarah Schannauer  Sharil Orellana  Harrison Laukhuff  Eric Lang  Timothy Becker  Erika McKinney  Kayli Thomas  Virginia Tilden  Mark Swartz  Jaime E Blair 《Journal of insect science (Online)》2022,22(1)

Eastern populations of the North American regal fritillary, Argynnis idalia Drury (1773), have been largely extirpated over the past half century. Here we report on the last remaining population of eastern regal fritillaries, located within a military installation in south-central Pennsylvania. Samples were obtained from field specimens during two years of annual monitoring, and from females collected for captive rearing over a five year period. Nuclear microsatellite and mitochondrial sequence data do not suggest subdivision within this population, but excess nuclear homozygosity indicates negative impacts on genetic diversity likely due to small population size and potential inbreeding effects. Molecular assays did not detect Wolbachia endosymbionts in field specimens of regal fritillary, but sympatric Argynnis sister species showed high prevalence of Wolbachia infected individuals. Our results inform ongoing conservation and reintroduction projects, designed to protect the last remaining regal fritillary population from extirpation in the eastern United States.  相似文献