1 / 7

Overriding questions

Explore relevant time and space scales impacting plankton diversity and biogeochemical cycling in the Hawaii Ocean Time-series (HOT) program since 1988. Discover the dynamics of carbon, nitrogen, and phosphorus inventories, and the role of N2 fixation in nutrient dynamics. Influence of ocean-climate teleconnections on plankton population structure.

bsamuel
Download Presentation

Overriding questions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Overriding questions • What are the relevant time and space scales to study plankton diversity? • Are the time and space scales that regulate diversity the same as those that control biogeochemical cycling?

  2. The Hawaii Ocean Time-series (HOT) • Established in 1988 as part of the U.S. JGOFS program. • Primary objectives: characterize time-dependent dynamics in carbon, nitrogen, and phosphorus inventories and fluxes.

  3. What have we learned? • Prokaryote dominated ecosystem. • Ocean biology regulates nutrient stoichiometry and carbon export. • Chronically oligotrophic upper ocean (NO3- + NO2- <10 nM, PO43- <100 nM). • N2 fixation plays an important role in nutrient dynamics and carbon export. • Organization of plankton populations may be controlled by ocean-climate teleconnections.

  4. Time scales and processes driving biological variability in the oceans Global-scale climate variability Millennia PDO / NAO ~ 10-30 year period Decadal ENSO ~ 1-3 year period Interannual Intraannual Seasonal (light, temperature, nutrients) Diurnal Tidal, light, predation

  5. Are ocean-climate teleconnections reflected in plankton dynamics?

  6. Interdecadal and decadal scale dynamics in pigment biomarkers

  7. Summary • Plankton populations at Station ALOHA vary over a broad continuum of time scales ranging from seasonal, to decadal. • Plankton population structure in the central North Pacific Ocean appears linked to ocean-climate dynamics. • Understanding the mechanisms regulating temporal dynamics in plankton populations requires an integrated biogeochemical approach.

More Related