{"66050":{"#nid":"66050","#data":{"type":"news","title":"Jason Landrum (INTA PhD Student) publishes in \u0022Deep Sea Research\u0022","body":[{"value":"\u003Cp\u003E\u003C\/p\u003E\u003Cp\u003E\nJason Landrum, a PhD Student at The Sam Nunn School of International Affairs, publishes in \u003Cem\u003EDeep Sea Research\u003C\/em\u003E, \u0022Basin-scale distributions of stable nitrogen isotopes in the subtropical North Atlantic Ocean:  Contribution of diazotroph nitrogen to particulate organic matter and mesozooplankton.\u0022\u003C\/p\u003E\n\u003Cp\u003E\u003Cem\u003EAbstract: \u003C\/em\u003E New N inputs via biological N2-fixation play a critical role in supporting oceanic primary production and influencing global biogeochemical cycles. Numerous studies have documented significant N2-fixation rates in the North Atlantic, but relatively little is known of the pathways and fluxes of new N through planktonic food webs. Here, we report the natural abundance of 15N in, and contribution of diazotroph N (ND) inputs to, suspended particles and mesozooplankton collected along two transects in the subtropical North Atlantic Ocean (STNA). Samples were collected in April\u2013May 2000 along the two main transects to evaluate spatial trends of 15N within the Western Atlantic and across the basin. We found that N2-fixation is a key component in supporting both primary and secondary productions throughout the STNA. ND contribution was generally higher for suspended particles than for mesozooplankton, and we observed a high ND contribution to suspended particles over large spatial scales in the western and central STNA. Mesozooplankton ND incorporation suggests that diazotroph production supports oceanic food webs over longer timescales (e.g., weeks to months) than that of particle turnover (e.g., days). Larger mesozooplankton (1000\u20134000 \u03bcm) generally incorporated more ND than smaller mesozooplankton (250\u20131000 \u03bcm), and thus may exert a stronger influence on an ND movement within the water column. Spatial and vertical patterns of variation in mesozooplankton \u03b415N also suggest either broad geographical differences in an ND contribution to secondary production, or temporal variations in ND incorporation via mesozooplankton communities.\n\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E**View \u003Ca href=\u0022http:\/\/www.sciencedirect.com\/science?_ob=ArticleURL\u0026amp;_udi=B6VGB-52540N0-1\u0026amp;_user=10\u0026amp;_coverDate=05%2F31%2F2011\u0026amp;_alid=1745847267\u0026amp;_rdoc=1\u0026amp;_fmt=high\u0026amp;_orig=search\u0026amp;_origin=search\u0026amp;_zone=rslt_list_item\u0026amp;_cdi=6034\u0026amp;_sort=r\u0026amp;_st=13\u0026amp;_docanchor=\u0026amp;view=c\u0026amp;_ct=1\u0026amp;_acct=C000050221\u0026amp;_version=1\u0026amp;_urlVersion=0\u0026amp;_userid=10\u0026amp;md5=6d060740c1c1612277b249146f66ac6e\u0026amp;searchtype=a\u0022\u003EFull Publication\u003C\/a\u003E\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EJason Landrum holds a BA in Science of Earth Systems from Cornell University, as well as a PhD in Biological Oceanography from the Georgia Institute of Technology.  Landrum\u0027s research in the areas of both biology and international affairs at Georgia Tech has fostered a passion for the sensitive nature and consequences of international environmental policy, and as a Ph.D. student in the IAST program, he hopes to redirect his scientific goals in order to assess how the international community aims to solve future global environmental threats. Landrum is also interested in studying the role scientific communities play in the formation and implementation of domestic and international environmental policies.\u003C\/p\u003E\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EJason Landrum (INTA PhD Student) publishes in \u003Cem\u003EDeep Sea Research\u003C\/em\u003E, \u0022Basin-scale distributions of stable nitrogen isotopes in the subtropical North Atlantic Ocean:  Contribution of diazotroph nitrogen to particulate organic matter and mesozooplankton.\u0022\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Landrum also holds a PhD, Biological Oceanography (Georgia Tech)"}],"uid":"27184","created_gmt":"2011-05-09 00:00:00","changed_gmt":"2016-10-08 03:08:41","author":"Jene Gladstone","boilerplate_text":"","field_publication":"","field_article_url":"","dateline":{"date":"2011-05-08T00:00:00-04:00","iso_date":"2011-05-08T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"66051":{"id":"66051","type":"image","title":"INTA PhD Student - Jason Landrum","body":null,"created":"1449176916","gmt_created":"2015-12-03 21:08:36","changed":"1475894587","gmt_changed":"2016-10-08 02:43:07"}},"media_ids":["66051"],"related_links":[{"url":"http:\/\/www.inta.gatech.edu\/faculty-staff\/listing.php?uID=54","title":"Jason Landrum\u0027s BIO"},{"url":"http:\/\/www.sciencedirect.com\/science?_acct=C000050\u0026_alid=1745847267\u0026_cdi=6034\u0026_coverDate=05%2F31%2F2011\u0026_ct=1\u0026_fmt=high\u0026_ob=ArticleURL\u0026_orig=search\u0026_origin=search\u0026_rdoc=1\u0026_sort=r\u0026_st=13\u0026_udi=B6VGB-52540N0-1\u0026_user=10\u0026_zone=rslt_list_item\u0026view=c","title":"Jason Landrum\u0027s Publication"}],"groups":[{"id":"1281","name":"Ivan Allen College of Liberal Arts"}],"categories":[{"id":"129","name":"Institute and Campus"},{"id":"134","name":"Student and Faculty"},{"id":"154","name":"Environment"},{"id":"146","name":"Life Sciences and Biology"},{"id":"135","name":"Research"}],"keywords":[{"id":"277","name":"Biology"},{"id":"13095","name":"Deep Sea Research"},{"id":"109","name":"Georgia Tech"},{"id":"999","name":"IAC"},{"id":"851","name":"INTA"},{"id":"13094","name":"Jason Landrum"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003E\u003Cstrong\u003EMarilu Suarez\u003C\/strong\u003E\u003Cbr \/\u003ESam Nunn School of International Affairs\u003Cbr \/\u003E\u003Ca href=\u0022mailto:marilu.suarez@inta.gatech.edu\u0022\u003EContact Marilu Suarez\u003C\/a\u003E\u003Cbr \/\u003E\u003Cstrong\u003E404-894-3195\u003C\/strong\u003E\u003C\/p\u003E","format":"limited_html"}],"email":["marilu.suarez@inta.gatech.edu"],"slides":[],"orientation":[],"userdata":""}}}