Archived NIMBioS Working Group

Ocean Viral Dynamics

Topic: Modeling Viral Effects on Global Carbon and Biogeochemical Cycles

Organizers:
Joshua S. Weitz (Theoretical Ecologist, School of Biology & Physics, Georgia Inst. of Technology, Atlanta)
Steven W. Wilhelm (Environmental Microbiologist, Microbiology, Univ. of Tennessee, Knoxville)

Meeting dates: Apr 11-13, 2012; Oct 22-24, 2012; June 3-5, 2013; Jan 7-9, 2014

Project Summary. Global earth systems and climate models attempt to integrate geophysical processes with the biology of microbes to metazoans to predict the dynamics of carbon and biogeochemical cycles and of biodiversity. However, the smallest biotic agents on the planet - viruses - are rarely, if ever, included in such models, despite empirical evidence that viruses may have dramatic consequences on model predictions. Viruses infect and kill bacteria, archaea and microeukaryotes at the base of the ocean's food web. Viral-induced mortality of microbes releases carbon and other nutrients back into the environment and, as a consequence, redirects these materials away from higher trophic levels (e.g. plankton and fish). Theoretical work on aquatic viruses is in its infancy and has not yet resolved the quantitative effects of viruses on carbon and other biogeochemical cycles.

The goal of this working group is to identify and devise analytical approaches to quantifying viral effects on the biogeochemical dynamics of carbon and other key nutrients in the oceans. The group plans to: (i) assemble and synthesize available empirical information on how viruses affect carbon and nutrient flow in microbial communities; (ii) design and analyze dynamic models of viral effects on microbes in a modular format suitable for inclusion in global-scale earth systems models. The working group includes viral ecologists specializing in aquatic ecosystems, microbiologists focusing on carbon and nutrient cycles and theorists with expertise in viral ecology and large-scale ecosystem models who will work together toward these shared goals.

Meeting Summaries

Meeting 1 Summary. The working group discussed broad challenges in understanding the ecological role of viruses in the oceans. One such challenge is to quantify the effect that viruses have on carbon and nutrient cycles. The group identified a set of research questions that require a combined empirical-modeling approach in order to understand how viral interactions at a cellular scale affect ecosystem level function. These questions include the statistical analysis of viral effects data as well as the integration of viral models across spatiotemporal scales. Two collaborative projects were initiated with the goal of having preliminary results by the next meeting, October 22-24, 2012.

Meeting 2 Summary. During the second meeting, the working group focused on ways to integrate models of viral-host interactions with data on viral effects in marine environments. First, the group reviewed preliminary models developed as a result of discussions that took place during Meeting 1, as a means to test hypotheses regarding viral effects on carbon and other nutrient cycles. Second, the group discussed the state of data relevant to viral effects from ocean surveys. Finally, the group discussed new opportunities to connect viral models and data at global scales. Multiple collaborative projects will continue with the goal of having initial drafts of a viral-effects model, including analysis and results completed by the third meeting, June 3-5, 2013.

Meeting 3 Summary. During the third meeting, the working group discussed results of ongoing work on integrating models of viral-host interactions with data on viral effects in marine environments. First, the group reviewed model results developed as a direct results of discussions that took place during previous meetings and follow-up work that took place between meetings. These models were developed to test hypotheses regarding viral effects on carbon and other nutrient cycles. Second, the group discussed the state of data relevant to viral effects from ocean surveys, including statistical analysis of the available datasets. Multiple collaborative projects will continue with the goal of having submissions of both a modeling paper and a data analysis paper by the fourth and final meeting, January 7-9, 2014.

Meeting 4 Summary. During the fourth meeting, the working group discussed results of ongoing work on integrating models of viral-host interactions with data on viral effects in marine environments. First, the group reviewed progress on analyzing viral-associated data from ocean surveys. Second, the group reviewed progress in developing models of viral effects on ocean ecosystems. Preliminary drafts were discussed and a timeline was proposed to submit both manuscripts and coordinate future follow-up activities.

Meeting 1 participants (Back row, L to R): Steven Wilhelm, Curtis Suttle, Frede Thingstad, Alison Buchan, Eric Wommack, Charlie Stock, Joshua Weitz, Willie Wilson, Mathias Middleboe; (Front, L to R): Derek Sonderegger, Maureen Coleman, Chuan Xue, Lydia Bourouiba, Jay Lennon Not pictured: Mick Follows

Meeting 3 participants (Back row, L to R): Mick Follows, Curtis Suttle, Jed Fuhrman, Alison Buchan, Steve Wilhelm, Charlie Stock, Eric Wommack, Mathias Middelboe, Joshua Weitz; (Front row, L to R): Lydia Bourouiba, Maureen Coleman, Jay Lennon, Derek Sonderegger

Meeting 4 participants (L to R): Charlie Stock, Jed Fuhrman, Joshua Weitz, Maureen Coleman, Steven Wilhelm, Derek Sonderegger, Mathias Middleboe, Frede Thingstad, Willie Wilson, Lydia Bourouiba, Mick Follows, Alison Buchan.

NIMBioS Working Groups are chosen to focus on major scientific questions at the interface between biology and mathematics. NIMBioS is particularly interested in questions that integrate diverse fields, require synthesis at multiple scales, and/or make use of or require development of new mathematical/computational approaches. NIMBioS Working Groups are relatively small (up to 10 participants), focus on a well-defined topic, and have well-defined goals and metrics of success. Working Groups will meet up to 3 times over a two-year period, with each meeting lasting up to 2.5 days.

A goal of NIMBioS is to enhance the cadre of researchers capable of interdisciplinary efforts across mathematics and biology. As part of this goal, NIMBioS is committed to promoting diversity in all its activities. Diversity is considered in all its aspects, social and scientific, including gender, ethnicity, scientific field, career stage, geography and type of home institution. Questions regarding diversity issues should be directed to diversity@nimbios.org. You can read more about our Diversity Plan on our NIMBioS Policies web page. The NIMBioS building is fully handicapped accessible.

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From 2008 until early 2021, NIMBioS was supported by the National Science Foundation through NSF Award #DBI-1300426, with additional support from The University of Tennessee, Knoxville. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.