第26回生態適応セミナー

 

 

山崎秀勝博士 (東京海洋大学教授)

Scott Gallager博士 (Woods Hole Oceanographic Institution研究員)

Amber York博士 (Woods Hole Oceanographic Institution助手)
     
 
 
 
     
 

日時 10月26日(月)15:00ー

 
  場所 農学部第5講義室  

講師:山崎秀勝博士 (東京海洋大学教授)

"Oceanic turbulence and phytoplankton dynamics"

I present the nature of oceanic turbulence making use of observed data and how microscale fluid motions affect planktonic organisms. Then Lagrangian simulations are introduced to model phytoplankton dynamics in turbulent water column. In order to link the models I also introduce observed patterns between mixing and phytoplankton dynamics. Finally, I present recent development in microstructure instrumentation to measure micro-scale fluorescence field. In addition to the fluorescence field, I have successfully mounted a mini-camera system that resolves less than mm scale optical images. These new findings are presented with a potential future simulation approach.

講師:Scott Gallager博士 (Woods Hole Oceanographic Institution研究員)

"The roll of upwelling and internal waves as forcing agents in ecosystem change along the Pacific coast of Panama"

This ongoing study seeks to understand how basin scale processes such as upwelling, influence local processes including internal waves, microstructure and plankton behavior leading to formation of plankton layers and changes in reef fish community composition. Mixing generated by breaking internal waves and plankton behavior was studied using an optical imaging sensor coupled with a cabled oceanographic observatory, PLUTO (Panama LJL Underwater Tropical Observatory) in the Gulf of Chiriqui, Panama.

講師: Amber York博士 (Woods Hole Oceanographic Institution助手)

"HabCam: An optical benthic habitat characterization system to quantify ecosystem change"

The HabCam (HABitat mapping CAMera system) is a towed vehicle originally designed to survey sea scallop stocks along the Northeastern Continental Shelf of the United States using optical imagery. Its scope was expanded to provide capabilities for habitat survey and characterization of ecosystem change over time. Six sentinel sites are being surveyed by HabCam with repeated visits seasonally to document change. Notably, discovery of areas impacted by the invasive tunicate Didemnum vexillum have been examples of drastic ecosystem change. Percent D. vexillum coverage is correlated to decreased density of much of the megafauna seen in HabCam images. Observations and data from the HabCam system provide information previously impossible to gain from standard dredge survey such as predator/prey interactions, calculations of nearest neighbor distances, and patchiness indices.