[{"awards": "2445119 Sumner, Dawn", "bounds_geometry": "POLYGON((163.02 -77.59,163.044 -77.59,163.068 -77.59,163.092 -77.59,163.116 -77.59,163.14 -77.59,163.164 -77.59,163.188 -77.59,163.212 -77.59,163.236 -77.59,163.26 -77.59,163.26 -77.59400000000001,163.26 -77.598,163.26 -77.602,163.26 -77.606,163.26 -77.61,163.26 -77.614,163.26 -77.618,163.26 -77.622,163.26 -77.62599999999999,163.26 -77.63,163.236 -77.63,163.212 -77.63,163.188 -77.63,163.164 -77.63,163.14 -77.63,163.116 -77.63,163.092 -77.63,163.068 -77.63,163.044 -77.63,163.02 -77.63,163.02 -77.62599999999999,163.02 -77.622,163.02 -77.618,163.02 -77.614,163.02 -77.61,163.02 -77.606,163.02 -77.602,163.02 -77.598,163.02 -77.59400000000001,163.02 -77.59))", "dataset_titles": null, "datasets": null, "date_created": "Thu, 16 Jul 2026 00:00:00 GMT", "description": "In the McMurdo Dry Valleys (MDV), the permanently ice-covered lakes are unusual aquatic environments that are home to unique communities of microbes. Mats of photosynthetic microbes grow on the floors of these lakes and are an important part of the ecosystems in MDV environments. They experience extreme seasonality that includes the challenge of months of winter darkness. Mats cannot photosynthesize during winter, but they do remain active, and this can impact their ability to respond when spring/summer conditions arrive. To understand these impacts, it is essential to study the seasonal differences in mat organism activity, particularly during winter and then during the transition to spring sunlight. This project aims to characterize winter season activity and chemistry in benthic microbial mats in Lake Fryxell, McMurdo Dry Valleys, Antarctica. To access winter-like conditions, temporary shades will be installed over mats to \u201cextend\u201d dark winter conditions into spring, when field access is possible. By sampling in extended winter and spring/summer this project will determine the changes in benthic mat community composition, identify interactions between cell activity and water chemistry, and understand the effects of spring photosynthesis initiation on mats that become anoxic over winter. The permanently ice-covered lakes of the McMurdo Dry Valleys (MDV) are home to unique communities of microbes. Benthic mats of photosynthetic cyanobacteria are present in these lakes and are an important part of the primary productivity for ecosystems in MDV environments. Winter darkness inhibits mat photosynthesis, leading to anoxic conditions, limited viable metabolisms, and changes in mat biogeochemistry. With the return of sunlight photosynthesis begins again and metabolism and biogeochemistry changes. To better understand the interdependencies and impacts of these transitions, the project will characterize seasonal microbial diversity and metabolic differences in benthic mats, and the ecosystem effects caused by spring oxygen production in Lake Fryxell, McMurdo Dry Valleys, Antarctica. To access winter-like conditions, temporary shades will be installed over mats to \u201cextend\u201d dark winter conditions into spring, when field access is possible. The project will characterize the metabolic changes in mat communities using metagenomic and metatranscriptomic methods, in conjunction with pore water dissolved oxygen and sulfide measurements from the environment during the winter/spring transition. This award reflects NSF\u0027\u0027s statutory mission and has been deemed worthy of support through evaluation using the Foundation\u0027\u0027s intellectual merit and broader impacts review criteria.", "east": 163.26, "geometry": "POINT(163.14 -77.61)", "instruments": null, "is_usap_dc": true, "keywords": "LAKE/POND; Transcriptome; Microbial Metabolism; Redox State; COMMUNITY DYNAMICS; ECOSYSTEM FUNCTIONS; Lake Fryxell; Photosynthetically Active Radiation (par); Microbial Mat", "locations": "Lake Fryxell", "north": -77.59, "nsf_funding_programs": "Antarctic Organisms and Ecosystems", "paleo_time": null, "persons": "Sumner, Dawn; Mackey, Tyler", "platforms": null, "repositories": null, "science_programs": null, "south": -77.63, "title": "Seasonal Metabolism Changes Across Redox Gradients in Photosynthetic Mats, Lake Fryxell, Antarctica", "uid": "p0010573", "west": 163.02}, {"awards": "0529087 Ross, Robin; 0528728 Vernet, Maria; 0529666 Fritsen, Christian", "bounds_geometry": "POLYGON((-69.08 -64.8,-68.632 -64.8,-68.184 -64.8,-67.736 -64.8,-67.288 -64.8,-66.84 -64.8,-66.392 -64.8,-65.944 -64.8,-65.496 -64.8,-65.048 -64.8,-64.6 -64.8,-64.6 -65.121,-64.6 -65.442,-64.6 -65.763,-64.6 -66.084,-64.6 -66.405,-64.6 -66.726,-64.6 -67.047,-64.6 -67.368,-64.6 -67.689,-64.6 -68.01,-65.048 -68.01,-65.496 -68.01,-65.944 -68.01,-66.392 -68.01,-66.84 -68.01,-67.288 -68.01,-67.736 -68.01,-68.184 -68.01,-68.632 -68.01,-69.08 -68.01,-69.08 -67.689,-69.08 -67.368,-69.08 -67.047,-69.08 -66.726,-69.08 -66.405,-69.08 -66.084,-69.08 -65.763,-69.08 -65.442,-69.08 -65.121,-69.08 -64.8))", "dataset_titles": "Expedition data of NBP0103; The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)", "datasets": [{"dataset_uid": "600048", "doi": "10.15784/600048", "keywords": "Bellingshausen Sea; Biota; Oceans; Phytoplankton; Southern Ocean", "people": "Vernet, Maria", "repository": "USAP-DC", "science_program": null, "title": "The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)", "url": "https://www.usap-dc.org/view/dataset/600048"}, {"dataset_uid": "600049", "doi": "10.15784/600049", "keywords": "Bellingshausen Sea; Biota; Oceans; Southern Ocean", "people": "Ross, Robin Macurda; Quetin, Langdon B.", "repository": "USAP-DC", "science_program": null, "title": "The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)", "url": "https://www.usap-dc.org/view/dataset/600049"}, {"dataset_uid": "600050", "doi": "10.15784/600050", "keywords": "Bellingshausen Sea; Cryosphere; Oceans; Photosynthetically Active Radiation (par); Sea Ice; Sea Surface; Southern Ocean; Total Integrated Exposure To PAR", "people": "Fritsen, Christian", "repository": "USAP-DC", "science_program": null, "title": "The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)", "url": "https://www.usap-dc.org/view/dataset/600050"}, {"dataset_uid": "002595", "doi": null, "keywords": null, "people": null, "repository": "R2R", "science_program": null, "title": "Expedition data of NBP0103", "url": "https://www.rvdata.us/search/cruise/NBP0103"}], "date_created": "Sat, 02 Apr 2011 00:00:00 GMT", "description": "This collaborative study between the Desert Research Institute, the University of California, Santa Barbara (0529087; Robin Ross), and the University of California, San Diego (0528728; Maria Vernet) will examine the relationship between sea ice extent along the Antarctic Peninsula and the life history of krill (Euphausia superba), by developing, refining, and linking diagnostic datasets and models of phytoplankton decreases in the fall, phytoplankton biomass incorporation into sea ice, sea ice growth dynamics, sea ice algal production and biomass accumulation, and larval krill energetics, condition, and survival. Krill is a key species in the food web of the Southern Ocean ecosystem, and one that is intricately involved with seasonal sea ice dynamics. Results from the Southern Ocean experiment of the Global Ocean Ecosystems Dynamics program (SO-Globec) field work as well as historical information on sea ice dynamics and krill recruitment suggest a shift in the paradigm that all pack ice is equally good krill habitat.\u003cbr/\u003e\u003cbr/\u003eSO-Globec is a multidisciplinary effort focused on understanding the physical and biological factors that influence growth, reproduction, recruitment and survival of Antarctic krill (Euphausia superba). The program uses a multi-trophic level approach that includes the predators and competitors of Antarctic krill, represented by other zooplankton, fish, penguins, seals, and cetaceans. It is currently in a synthesis and modeling phase. This collaborative project is concerned with the lower trophic levels, and will be integrated with other synthesis and modeling studies that deal with grazers, predators, and other higher trophic levels.", "east": -64.6, "geometry": "POINT(-66.84 -66.405)", "instruments": "IN SITU/LABORATORY INSTRUMENTS \u003e MAGNETIC/MOTION SENSORS \u003e GRAVIMETERS \u003e GRAVIMETERS; IN SITU/LABORATORY INSTRUMENTS \u003e PROFILERS/SOUNDERS \u003e ACOUSTIC SOUNDERS \u003e MSBS", "is_usap_dc": true, "keywords": "R/V NBP; Not provided", "locations": null, "north": -64.8, "nsf_funding_programs": "Antarctic Organisms and Ecosystems; Antarctic Ocean and Atmospheric Sciences; Antarctic Organisms and Ecosystems; Antarctic Ocean and Atmospheric Sciences; Antarctic Ocean and Atmospheric Sciences; Antarctic Organisms and Ecosystems", "paleo_time": null, "persons": "Fritsen, Christian; Vernet, Maria; Ross, Robin Macurda; Quetin, Langdon B.", "platforms": "Not provided; WATER-BASED PLATFORMS \u003e VESSELS \u003e SURFACE \u003e R/V NBP", "repo": "USAP-DC", "repositories": "R2R; USAP-DC", "science_programs": null, "south": -68.01, "title": "Collaborative Research: U.S. SO GLOBEC Synthesis and Modeling: Timing is Everything: The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)", "uid": "p0000522", "west": -69.08}]

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Seasonal Metabolism Changes Across Redox Gradients in Photosynthetic Mats, Lake Fryxell, Antarctica

2445119

2026-07-16

Sumner, Dawn; Mackey, Tyler

No dataset link provided

In the McMurdo Dry Valleys (MDV), the permanently ice-covered lakes are unusual aquatic environments that are home to unique communities of microbes. Mats of photosynthetic microbes grow on the floors of these lakes and are an important part of the ecosystems in MDV environments. They experience extreme seasonality that includes the challenge of months of winter darkness. Mats cannot photosynthesize during winter, but they do remain active, and this can impact their ability to respond when spring/summer conditions arrive. To understand these impacts, it is essential to study the seasonal differences in mat organism activity, particularly during winter and then during the transition to spring sunlight. This project aims to characterize winter season activity and chemistry in benthic microbial mats in Lake Fryxell, McMurdo Dry Valleys, Antarctica. To access winter-like conditions, temporary shades will be installed over mats to “extend” dark winter conditions into spring, when field access is possible. By sampling in extended winter and spring/summer this project will determine the changes in benthic mat community composition, identify interactions between cell activity and water chemistry, and understand the effects of spring photosynthesis initiation on mats that become anoxic over winter. The permanently ice-covered lakes of the McMurdo Dry Valleys (MDV) are home to unique communities of microbes. Benthic mats of photosynthetic cyanobacteria are present in these lakes and are an important part of the primary productivity for ecosystems in MDV environments. Winter darkness inhibits mat photosynthesis, leading to anoxic conditions, limited viable metabolisms, and changes in mat biogeochemistry. With the return of sunlight photosynthesis begins again and metabolism and biogeochemistry changes. To better understand the interdependencies and impacts of these transitions, the project will characterize seasonal microbial diversity and metabolic differences in benthic mats, and the ecosystem effects caused by spring oxygen production in Lake Fryxell, McMurdo Dry Valleys, Antarctica. To access winter-like conditions, temporary shades will be installed over mats to “extend” dark winter conditions into spring, when field access is possible. The project will characterize the metabolic changes in mat communities using metagenomic and metatranscriptomic methods, in conjunction with pore water dissolved oxygen and sulfide measurements from the environment during the winter/spring transition. This award reflects NSF''s statutory mission and has been deemed worthy of support through evaluation using the Foundation''s intellectual merit and broader impacts review criteria.

Collaborative Research: U.S. SO GLOBEC Synthesis and Modeling: Timing is Everything: The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)

0529087
0528728
0529666

2011-04-02

Fritsen, Christian; Vernet, Maria; Ross, Robin Macurda; Quetin, Langdon B.

The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)	USAP-DC
The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)	USAP-DC
The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)	USAP-DC
Expedition data of NBP0103	R2R

USAP-DC