![]() ![]() Another source where you can learn more about the effects that Fukushima had on Hawaiʻi is the State of Hawaiʻi Department of Health (DOH) at. If you are interested in learning about the propagation of these isotopes through the food chain and reading an interesting story on tuna migration, please see the special issue of Oceanus prepared by colleagues and collaborators from the Woods Hole Oceanographic Institution. These results report on radiocesium activities in ocean water. Cesium-134 and 137 activities in the central North Pacific Ocean after the Fukushima Dai-ichi nuclear power plant accident. The data presented here have been published in the Special Issue of Biogeosciences: Impacts of the Fukushima nuclear power plant discharges on the ocean and can be cited as follows:Ĭitation: Kamenik, J., H. The radioactive isotopes, or radionuclides, that escaped in the highest amounts were iodine-131 (I-131), cesium-137 (Cs-137), and cesium-134 (Cs-134). This was the largest accidental release of radioactivity into the ocean ever. There were several subsequent leaks of highly radioactive water into the ocean. To suppress further overheating they were cooled by sea water, which then drained into the ocean carrying radioactivity with it. Three reactors experienced partial core meltdown. Several reactor units and their containments were damaged by hydrogen explosions, which allowed radioactive gases to escape into the atmosphere. The Tohoku earthquake and subsequent tsunami on March 11, 2011, led to power failures that prevented the proper cooling of several reactors at the Fukushima Dai-ichi Nuclear Power Plant (NPP). This study highlights that the degree of genetic differentiation between ecologically-diverged populations can vary depending on the strength of natural selection in the very early phases of speciation.Authors: Henrietta Dulai, Jan Kamenik, and Kamila Stastnaĭepartment of Geology and Geophysics, University of Hawaiʻi at MānoaĮ-mail: than 1,000 gallons of sea water were processed for cesium analysis in Dulai’s lab between March 20. Interestingly, the three clusters recovered genetic connectivity coincidentally with a recent population bottleneck, in line with the weak reproductive isolation observed in the species. This ecological divergence possibly began before the species colonized the island of Hawaii. Our demographic modeling suggested that the glaberrima cluster in wet environments maintained a relatively large population size and two clusters split: polymorpha in the subalpine zone and incana in dry and hot conditions. The three genetic clusters showed signatures of selection in genomic regions encompassing genes relevant to environmental adaptations, including genes associated with light utilization, oxidative stress, and leaf senescence, which are likely associated with the ecological differentiation of the species. polymorpha forest stands on the island of Hawaii were differentiated into three genetic clusters, each of which grows in a distinctive environment and includes substantial genetic and phenotypic diversity. We analyzed the whole genomes of 70 plants collected throughout the island of Hawaii, which is the youngest island with the highest altitude in the archipelago and encompasses a wide range of environments. We focused on Metrosideros polymorpha, a unique example of the incipient radiation of woody species, to examine how an ecological divergence continues in the face of gene flow. Copy AbstractĮcological divergence in a species provides a valuable opportunity to study the early stages of speciation. ![]() Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species. Izuno, Ayako Onoda, Yusuke Amada, Gaku Kobayashi, Keito Mukai, Mana Isagi, Yuji Shimizu, Kentaro K (2022). ![]()
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