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From: Gabrielle Boudreaux Bodin
Subject: Weekly Highlights, USGS National Wetlands Research Center, August 29, 2013

Departmental/Bureau News - Current

USGS Scientist Studies Factors Affecting Distribution of Neotropical Mangroves: USGS NWRC Ecologist Ken Krauss, along with collaborators from Universidad del Quindío (Quindío, Colombia) and Louisiana State University (Baton Rouge, Louisiana), co-authored a paper in the International Journal of Forestry Research entitled Leaf gas exchange and nutrient use efficiency help explain the distribution of two Neotropical mangroves under contrasting flooding and salinity. This study attempted to understand the field distribution of red mangrove (Rhizophora mangle) and white mangrove (Laguncularia racemosa) using ecophysiological metrics as influenced by salinity and hydroperiod in order to advance on-going forest simulation modeling efforts for the region. They found that salinity influences leaf gas exchange efficiency, might affect how gases are apportioned intercellularly, and accentuates different strategies for distributing leaf nitrogen to photosynthesis for these two species while growing competitively under field conditions. As a result, similar competitive physiological advantages might be afforded to white mangrove and red mangrove seedlings at high salinity and higher nitrogen availability, while white mangrove might oust red mangrove at high salinity and lower nitrogen availability within Neotropical floodplains because of more efficient usage of nitrogen. These data help explain processes that might be at play at the regeneration stage that influence the current distribution of these species along rivers, especially after major disturbances. (Ken Krauss, Lafayette, La.; 337-266-8882)

ACES Science Work Processes Team Meets to Finalize Report: On September 5, USGS NWRC Director Phil Turnipseed will meet with members of the USGS Achieving Cost Efficiencies for Science (ACES) Science Work Processes Team. The team was chartered with the goal of looking for ways to reduce some of the Bureau’s costs and provide recommendations on areas where USGS could increase efficiency. The team is currently working through comments and recommendations from the ACES review to finalize their report. (Jeniefer Pryor; Lafayette, La.; 337-266-8501)

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