Project Title

MCM-LTER: MCM6: The Roles of Legacy and Ecological Connectivity in a Polar Desert Ecosystem

Summary

Event Number:
C-505-M
NSF / OPP Award 2224760

Program Director:
Dr. William Ambrose

ASC POC/Implementer:
Ryan Steiner / Jenny Cunningham

Principal Investigator(s)

Dr. Cristina Danielle Takacs-Vesbach
cvesbach@gmail.com
University of New Mexico
Department of Biology
Albuquerque, New Mexico

Project Web Site:
https://mcm.lternet.edu/

Location

Supporting Stations: McMurdo Station
Research Locations: McMurdo Dry Valleys

Description

In this iteration of the McMurdo Long-Term Ecological Research (MCM-LTER) project (MCM6), the team will test ecological connectivity and stability theory in a system subject to strong physical drivers (e.g., geological legacies, extreme seasonality, contemporary climate change) and driven by microbial organisms. The team hypothesizes that the structure and functioning of the McMurdo Dry Valleys ecosystem depends on legacies and the contemporary frequency, duration, and magnitude of ecological connectivity. This hypothesis will be tested with new and continuing monitoring, experiments, and analyses of long-term datasets to examine (1) the stability of these ecosystems as reflected by sentinel taxa; (2) the relationship between ecological legacies and ecosystem resilience; (3) the importance of material carryover during periods of low connectivity to maintaining biological activity and community stability; and (4) how changes in disturbance dynamics disrupt ecological cycles through the polar night. Tests of these hypotheses will occur in field and modeling activities using new and existing long-term datasets.

Field Season Overview

Five participants will deploy on the Long-Term Ecological Research (LTER) limno team between mid-October and mid-February. The team will rotate among Lake Fryxell, Lake Hoare, and Lake Bonney camps, conducting two to three rounds of limno runs. Antarctic Support Contract carpentry staff will set up Polarhavens on the ice of Lake Fryxell, Lake Bonney, and Lake Hoare for the team to work from, and the team will melt holes in the ice to access the water column. The team will also make day trips to other lakes in the Dry Valleys (e.g., lakes Miers, Vanda, Joyce, Trough, and Vida) to collect samples. Between each limno run, the team will return to Crary Lab to process samples.

Deploying Team Members