Deep-Sea coral evidence for rapid change in ventilation of the deep north atlantic 15,400 years Ago   总被引：1，自引：0，他引：1  

JF Adkins  H Cheng  EA Boyle  ERM Druffel  RL Edwards 《Science (New York, N.Y.)》1998,280(5364):725-728

Coupled radiocarbon and thorium-230 dates from benthic coral species reveal that the ventilation rate of the North Atlantic upper deep water varied greatly during the last deglaciation. Radiocarbon ages in several corals of the same age, 15.41 +/- 0.17 thousand years, and nearly the same depth, 1800 meters, in the western North Atlantic Ocean increased by as much as 670 years during the 30- to 160-year life spans of the samples. Cadmium/calcium ratios in one coral imply that the nutrient content of these deep waters also increased. Our data show that the deep ocean changed on decadal-centennial time scales during rapid changes in the surface ocean and the atmosphere.  相似文献   

A novel use of social media to evaluate the occurrence of skin lesions affecting wild dusky grouper,Epinephelus marginatus (Lowe, 1834), in Libyan coastal waters          下载免费PDF全文

J Rizgalla  A P Shinn  H W Ferguson  G Paladini  N S Jayasuriya  J E Bron 《Journal of fish diseases》2017,40(5):609-620

The social media network Facebook^? was used to gather information on the occurrence and geographical distribution of dusky grouper dermatitis, a skin lesion affecting the dusky grouper, Epinephelus marginatus. Dusky grouper are common targets for spear fishermen in the Mediterranean and by monitoring spearfishing activity in Libyan waters, it was possible to document skin lesions from their entries on Facebook. Thirty‐two Facebook accounts and 8 Facebook groups posting from 23 Libyan coastal cities provided a retrospective observational data set comprising a total of 382 images of dusky grouper caught by spearfishing between December 2011 and December 2015. Skin lesions were observable on 57/362 fish, for which images were of sufficient quality for analysis, giving a minimal prevalence for lesions of 15.75%. Only dusky grouper exceeding an estimated 40 cm total length exhibited lesions. The ability to collect useful data about the occurrence and geographical distribution of pathological conditions affecting wild fish using social media networks demonstrates their potential utility as a tool to support epidemiological studies and monitor the health of populations of aquatic animals. To our knowledge, this represents the first time that such an approach has been applied for assessing health in a wild population of fish.  相似文献