Modeling Vitamin B1 Transfer to Consumers in the Aquatic Food Web M
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Response of Marine Food Webs to Climate-Induced Changes in Temperature and Inflow of Allochthonous Organic Matter
Response of marine food webs to climate-induced changes in temperature and inflow of allochthonous organic matter Rickard Degerman Department of Ecology and Environmental Science 901 87 Umeå Umeå 2015 1 Copyright©Rickard Degerman ISBN: 978-91-7601-266-6 Front cover illustration by Mats Minnhagen Printed by: KBC Service Center, Umeå University Umeå, Sweden 2015 2 Tillägnad Maria, Emma och Isak 3 Table of Contents Abstract 5 List of papers 6 Introduction 7 Aquatic food webs – different pathways Food web efficiency – a measure of ecosystem function Top predators cause cascade effects on lower trophic levels The Baltic Sea – a semi-enclosed sea exposed to multiple stressors Varying food web structures Climate-induced changes in the marine ecosystem Food web responses to increased temperature Responses to inputs of allochthonous organic matter Objectives 14 Material and Methods 14 Paper I Paper II and III Paper IV Results and Discussion 18 Effect of temperature and nutrient availability on heterotrophic bacteria Influence of food web length and labile DOC on pelagic productivity and FWE Consequences of changes in inputs of ADOM and temperature for pelagic productivity and FWE Control of pelagic productivity, FWE and ecosystem trophic balance by colored DOC Conclusion and future perspectives 21 Author contributions 23 Acknowledgements 23 Thanks 24 References 25 4 Abstract Global records of temperature show a warming trend both in the atmosphere and in the oceans. Current climate change scenarios indicate that global temperature will continue to increase in the future. The effects will however be very different in different geographic regions. In northern Europe precipitation is projected to increase along with temperature. -
A New Type of Plankton Food Web Functioning in Coastal Waters Revealed by Coupling Monte Carlo Markov Chain Linear Inverse Metho
A new type of plankton food web functioning in coastal waters revealed by coupling Monte Carlo Markov Chain Linear Inverse method and Ecological Network Analysis Marouan Meddeb, Nathalie Niquil, Boutheina Grami, Kaouther Mejri, Matilda Haraldsson, Aurélie Chaalali, Olivier Pringault, Asma Sakka Hlaili To cite this version: Marouan Meddeb, Nathalie Niquil, Boutheina Grami, Kaouther Mejri, Matilda Haraldsson, et al.. A new type of plankton food web functioning in coastal waters revealed by coupling Monte Carlo Markov Chain Linear Inverse method and Ecological Network Analysis. Ecological Indicators, Elsevier, 2019, 104, pp.67-85. 10.1016/j.ecolind.2019.04.077. hal-02146355 HAL Id: hal-02146355 https://hal.archives-ouvertes.fr/hal-02146355 Submitted on 3 Jun 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. 1 A new type of plankton food web functioning in coastal waters revealed by coupling 2 Monte Carlo Markov Chain Linear Inverse method and Ecological Network Analysis 3 4 5 Marouan Meddeba,b*, Nathalie Niquilc, Boutheïna Gramia,d, Kaouther Mejria,b, Matilda 6 Haraldssonc, Aurélie Chaalalic,e,f, Olivier Pringaultg, Asma Sakka Hlailia,b 7 8 aUniversité de Carthage, Faculté des Sciences de Bizerte, Laboratoire de phytoplanctonologie 9 7021 Zarzouna, Bizerte, Tunisie. -
Developments in Aquatic Microbiology
INTERNATL MICROBIOL (2000) 3: 203–211 203 © Springer-Verlag Ibérica 2000 REVIEW ARTICLE Samuel P. Meyers Developments in aquatic Department of Oceanography and Coastal Sciences, Louisiana State University, microbiology Baton Rouge, LA, USA Received 30 August 2000 Accepted 29 September 2000 Summary Major discoveries in marine microbiology over the past 4-5 decades have resulted in the recognition of bacteria as a major biomass component of marine food webs. Such discoveries include chemosynthetic activities in deep-ocean ecosystems, survival processes in oligotrophic waters, and the role of microorganisms in food webs coupled with symbiotic relationships and energy flow. Many discoveries can be attributed to innovative methodologies, including radioisotopes, immunofluores- cent-epifluorescent analysis, and flow cytometry. The latter has shown the key role of marine viruses in marine system energetics. Studies of the components of the “microbial loop” have shown the significance of various phagotrophic processes involved in grazing by microinvertebrates. Microbial activities and dissolved organic carbon are closely coupled with the dynamics of fluctuating water masses. New biotechnological approaches and the use of molecular biology techniques still provide new and relevant information on the role of microorganisms in oceanic and estuarine environments. International interdisciplinary studies have explored ecological aspects of marine microorganisms and their significance in biocomplexity. Studies on the Correspondence to: origins of both life and ecosystems now focus on microbiological processes in the Louisiana State University Station. marine environment. This paper describes earlier and recent discoveries in marine Post Office Box 19090-A. Baton Rouge, LA 70893. USA (aquatic) microbiology and the trends for future work, emphasizing improvements Tel.: +1-225-3885180 in methodology as major catalysts for the progress of this broadly-based field. -
Inverse Model Analysis of Plankton Food Webs in the North Atlantic and Western Antarctic Peninsula
W&M ScholarWorks Dissertations, Theses, and Masters Projects Theses, Dissertations, & Master Projects 2003 Inverse Model Analysis of Plankton Food Webs in the North Atlantic and Western Antarctic Peninsula Robert M. Daniels College of William and Mary - Virginia Institute of Marine Science Follow this and additional works at: https://scholarworks.wm.edu/etd Part of the Marine Biology Commons, and the Oceanography Commons Recommended Citation Daniels, Robert M., "Inverse Model Analysis of Plankton Food Webs in the North Atlantic and Western Antarctic Peninsula" (2003). Dissertations, Theses, and Masters Projects. Paper 1539617808. https://dx.doi.org/doi:10.25773/v5-605c-ty45 This Thesis is brought to you for free and open access by the Theses, Dissertations, & Master Projects at W&M ScholarWorks. It has been accepted for inclusion in Dissertations, Theses, and Masters Projects by an authorized administrator of W&M ScholarWorks. For more information, please contact [email protected]. Inverse Model Analysis of Plankton Food Webs in the North Atlantic and Western Antarctic Peninsula A Thesis Presented to The Faculty of the School of Marine Science The College of William and Mary in Virginia In Partial Fulfillment Of the Requirement for the Degree of Master of Science by Robert M. Daniels 2003 TABLE OF CONTENTS Page Acknowledgements ........................................................................................................................v List of Tables .................................................................................................................................vi -
A New Modeling Approach to Define Marine Ecosystems Food-Web Status
A new modeling approach to define marine ecosystems food-web status with uncertainty assessment Aurélie Chaalali, Blanche Saint-Béat, Géraldine Lassalle, François Le Loc’h, Samuele Tecchio, Georges Safi, Claude Savenkoff, Jérémy Lobry, Nathalie Niquil To cite this version: Aurélie Chaalali, Blanche Saint-Béat, Géraldine Lassalle, François Le Loc’h, Samuele Tecchio, et al.. A new modeling approach to define marine ecosystems food-web status with uncertainty as- sessment. Progress in Oceanography, Elsevier, 2015, 135, pp.37-47. 10.1016/j.pocean.2015.03.012. hal-01158158 HAL Id: hal-01158158 https://hal.archives-ouvertes.fr/hal-01158158 Submitted on 29 May 2015 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. A new modeling approach to define marine ecosystems food-web status with uncertainty assessment Aurélie Chaalali1*, Blanche Saint-Béat1, 2, Géraldine Lassalle3, François Le Loc’h4, Samuele Tecchio1, Georges Safi1, Claude Savenkoff5, Jérémy Lobry3, Nathalie Niquil1. 1Unité Mixte de Recherche Biologie des ORganismes et Ecosystèmes Aquatiques (BOREA), -
01 Delong 2-8 6/9/05 8:58 AM Page 2
01 Delong 2-8 6/9/05 8:58 AM Page 2 INSIGHT REVIEW NATURE|Vol 437|15 September 2005|doi:10.1038/nature04157 Genomic perspectives in microbial oceanography Edward F. DeLong1 and David M. Karl2 The global ocean is an integrated living system where energy and matter transformations are governed by interdependent physical, chemical and biotic processes. Although the fundamentals of ocean physics and chemistry are well established, comprehensive approaches to describing and interpreting oceanic microbial diversity and processes are only now emerging. In particular, the application of genomics to problems in microbial oceanography is significantly expanding our understanding of marine microbial evolution, metabolism and ecology. Integration of these new genome-enabled insights into the broader framework of ocean science represents one of the great contemporary challenges for microbial oceanographers. Marine ecosystems are complex and dynamic. A mechanistic under- greatly aid in these efforts. The correlation between organism- and habi- standing of the susceptibility of marine ecosystems to global environ- tat-specific genomic features and other physical, chemical and biotic mental variability and climate change driven by greenhouse gases will variables has the potential to refine our understanding of microbial and require a comprehensive description of several factors. These include biogeochemical process in ocean systems. marine physical, chemical and biological interactions including All these advances — improved cultivation, environmental genomic thresholds, negative and positive feedback mechanisms and other approaches and in situ microbial observatories — promise to enhance nonlinear interactions. The fluxes of matter and energy, and the our understanding of the living ocean system. Below, we provide a brief microbes that mediate them, are of central importance in the ocean, recent history of marine microbiology and outline some of the recent yet remain poorly understood. -
Food‐Web Structure and Ecosystem Function in the Laurentian Great
Received: 13 March 2018 | Revised: 14 September 2018 | Accepted: 18 September 2018 DOI: 10.1111/fwb.13203 REVIEW Food- web structure and ecosystem function in the Laurentian Great Lakes—Toward a conceptual model Jessica T. Ives1 | Bailey C. McMeans2 | Kevin S. McCann3 | Aaron T. Fisk4 | Timothy B. Johnson5 | David B. Bunnell6 | Kenneth T. Frank7 | Andrew M. Muir1 1Great Lakes Fishery Commission, Ann Arbor, Michigan Abstract 2Department of Biology, University of 1. The relationship between food-web structure (i.e., trophic connections, including Toronto, Mississauga, Ontario, Canada diet, trophic position, and habitat use, and the strength of these connections) and 3Department of Integrative ecosystem functions (i.e., biological, geochemical, and physical processes in an Biology, University of Guelph, Guelph, Ontario, Canada ecosystem, including decomposition, production, nutrient cycling, and nutrient 4Great Lakes Institute for Environmental and energy flows among community members) determines how an ecosystem re- Research, University of Windsor, Windsor, Ontario, Canada sponds to perturbations, and thus is key to understanding the adaptive capacity of 5Glenora Fisheries Station, Ontario Ministry a system (i.e., ability to respond to perturbation without loss of essential func- of Natural Resources and Forestry, Picton, tions). Given nearly ubiquitous changing environmental conditions and anthropo- Ontario, Canada genic impacts on global lake ecosystems, understanding the adaptive capacity of 6US Geological Survey Great Lakes Science Center, Ann Arbor, Michigan food webs supporting important resources, such as commercial, recreational, and 7Department of Fisheries and subsistence fisheries, is vital to ecological and economic stability. Oceans, Bedford Institute of Oceanography, Ocean Sciences Division, 2. Herein, we describe a conceptual framework that can be used to explore food- Dartmouth, Nova Scotia, Canada web structure and associated ecosystem functions in large lakes. -
The Role of Bacterioplankton in Lake Erie Ecosystem Processes: Phosphorus Dynamics and Bacterial Bioenergetics
THE ROLE OF BACTERIOPLANKTON IN LAKE ERIE ECOSYSTEM PROCESSES: PHOSPHORUS DYNAMICS AND BACTERIAL BIOENERGETICS A dissertation submitted to Kent State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy by Tracey Trzebuckowski Meilander December 2006 Dissertation written by Tracey Trzebuckowski Meilander B.S., The Ohio State University, 1994 M.Ed., The Ohio State University, 1997 Ph.D., Kent State University, 2006 Approved by __Robert T. Heath___________________, Chair, Doctoral Dissertation Committee __Mark W, Kershner_________________, Members, Doctoral Dissertation Committee __Laura G. Leff_____________________ __Alison J. Smith____________________ __Frederick Walz____________________ Accepted by __James L. Blank_____________________, Chair, Department of Biological Sciences __John R.D. Stalvey___________________, Dean, College of Arts and Sciences ii TABLE OF CONTENTS Page LIST OF FIGURES ………………………….……………………………………….….xi LIST OF TABLES ……………………………………………………………………...xvi DEDICATION …………………………………………………………………………..xx ACKNOWLEDGEMENTS ………………………………………………………….…xxi CHAPTER I. Introduction ….….………………………………………………………....1 The role of bacteria in aquatic ecosystems ……………………………………………….1 Introduction ……………………………………………………………………….1 The microbial food web …………………………………………………………..2 Bacterial bioenergetics ……………………………………………………………6 Bacterial productivity ……………………………………………………..6 Bacterial respiration ……………………………………………………..10 Bacterial growth efficiency ………...……………………………………11 Phosphorus in aquatic ecosystems ………………………………………………………12 -
Importance of the Microbial Food Web in Large Lakes (USA)
Verh. Inrernat. Vcrcin. Limnol. 3170-3175 Stuttgart, December 2000 Importance of the microbial food web in large lakes (USA) Hunter J. Carrick, Aneal Padmanabha, Laurie Weaver, Gary L. Fahnenstiel and Charles R. Goldman Introduction among lakes using rigorous microscopic enumera tion techniques; (2) tO measure the variation in The traditional view of food web structure catego microheterotrophic biomass through rime (season) rizes all organisms within an ecosystem into one of and space (depth); and (3) to put forth a hypothesis several feeding guilds (i.e. primary producers, concerning the role of microheterotrophs in the decomposers, herbivores, and consumers), where plankton of large lake ecosystems. Our findings indi energy is transferred from one guild to the next (LIN cate that the biomass of microheterotrophic plank I DFMAN 942). The biomass of these guilds decreases ron was large in all the lakes we studied, with Hpico geometrically with successive trophic levels ro form a (bacteria) representing the largest fraction of het pyramid, with a large biomass of plants at the base erotrophic biomass and exhibiting the least variance (EI TON 1927). Metabolic inefficiencies, such as in rime and space. excretion and sloppy feeding, produce significant losses ar each trophic level, with the greatest loss at rhe highest trophic level (RICH & WETZFL 1978). Materials and methods Deviations from this paradigm have been described for planktonic communities in the ocean, Lak~ sampling where the biomass of heterorrophic organisms can A total of four large lake ecosystems from two major rival phytoplankton, rhus indicating a tight coupling geographic regions in the United States of America between plants and animals (e.g. -
Microzooplankton and Phytoplankton Distribution and Dynamics in Relation to Seasonal Hypoxia in Lake Erie
IFYLE05: MICROZOOPLANKTON AND PHYTOPLANKTON DISTRIBUTION AND DYNAMICS IN RELATION TO SEASONAL HYPOXIA IN LAKE ERIE Principal Investigator: Peter J. Lavrentyev Department of Biology University of Akron Akron, OH 44325-3908 Phone: (330) 972-7922 FAX: (330) 972-8445 E-mail: [email protected] Executive Summary: Lake Erie is experiencing extensive hypoxic zones in its central basin despite the reductions in external P loading. The exact mechanisms of hypoxia development and its effects on biological communities including phytoplankton remain unclear. In marine and freshwater environments, the microbial food web (including microzooplankton) plays a key role in hypoxic environments. Microzooplankton have been indicated as an important component of Lake Erie ecosystem, but no data on their response to the seasonal hypoxia and trophic interactions with phytoplankton is available. This project aims to examine the composition, abundance, and growth and grazing-mortality rates of microzooplankton and phytoplankton in conjunction with the planned/ ongoing NOAA research on zooplankton and fish distribution in the three basins of Lake Erie. We will combine real-time flow-cytometric examination of plankton along four nearshore- offshore transects and diel vertical sampling with ship-board experiments at selected contrasting sites to determine plankton response to hypoxia and other environmental factors. Microscopic and molecular tools will be used to verify taxonomic determinations. The project will provide critical information for increasing the knowledge Lake Erie biological processes, improving the existing and future models, and enhancing the government’s ability to manage Lake Erie resources. SCIENTIFIC RATIONALE: Project Description: Hypoxia caused by terrestrial nutrient loading is an emerging national and global problem (Anderson and Taylor 2001; Rabalais et al. -
Predation Limitation in the Pelagic Microbial Food Web in an Oligotrophic Aquatic System
AQUATIC MICROBIAL ECOLOGY Vol. 30: 239–250, 2003 Published January 23 Aquat Microb Ecol Predation limitation in the pelagic microbial food web in an oligotrophic aquatic system Kristina Samuelsson1, 2,*, Agneta Andersson1, 2 1Marine Ecology, Department of Ecology and Environmental Science, Umeå University, 901 87 Umeå, Sweden 2Umeå Marine Sciences Centre, Norrbyn, 910 20 Hörnefors, Sweden ABSTRACT: The importance of predation as a limiting factor for net growth rates of organisms within the pelagic microbial food web was studied in a truncation experiment performed at a coastal station in the northern Baltic Sea. To remove potential predators, seawater was fractionated into 4 size groups: <0.8 µm (bacteria); <5 µm (bacteria + small flagellates + small phytoplankton); <10 µm (bac- teria + flagellates + phytoplankton); and <90 µm (bacteria + flagellates + phytoplankton + ciliates). The samples were incubated in situ in dialysis bags with a cut-off of 12 to 14 kDa, allowing nutrients and macromolecules to pass in and out of the incubation bags. The development of the plankton com- munity was followed over 8 d. Heterotrophic bacteria and flagellates were found to be predation-lim- ited, as removal of grazing increased their initial net growth rates from 0 to 0.5 and 0.4 d–1, respec- tively. Picoeukaryotic autotrophs increased their net growth rates from 0 to 0.6 d–1 when flagellates and ciliates were removed. Other phytoplankton and ciliates did not show any initial response to predator exclusion, indicating that they were not predation-limited. The main trophic links within the microbial food web seemed to be from heterotrophic bacteria to small heterotrophic flagellates, from small heterotrophic flagellates and autotrophic picoeukaryotes to intermediate protozoa (medium- sized flagellates and small ciliates) and from intermediate protozoa to large protozoa (large flagel- lates and large ciliates). -
Microbial Food Webs & Lake Management
New Approaches Microbial Food Webs & Lake Management Karl Havens and John Beaver cientists and managers organism’s position in the food web. X magnification under a microscope) dealing with the open water Organisms occurring at lower trophic are prokaryotic cells that represent one (pelagic) region of lakes and levels (e.g., bacteria and flagellates) of the first and simplest forms of life reservoirs often focus on two are near the “bottom” of the food web, on the earth. Most are heterotrophic, componentsS when considering water where energy and nutrients first enter meaning that they require organic quality or fisheries – the suspended the ecosystem. Organisms occurring at sources of carbon, however, some can algae (phytoplankton) and the suspended higher trophic levels (e.g., zooplankton synthesize carbon by photosynthesis or animals (zooplankton). This is for good and fish) are closer to the top of the food chemosynthesis. The blue-green algae reason. Phytoplankton is the component web, i.e., near the biological destination of (cyanobacteria) actually are bacteria, but responsible for noxious algal blooms and the energy and nutrients. We also use the for the purpose of this discussion, are it often is the target of nutrient reduction more familiar term trophic state, however not considered part of the MFW because strategies or other in-lake management only in the context of degree of nutrient they function more like phytoplankton solutions such as the application of enrichment. in the grazing food chain. Flagellates algaecide. Zooplankton is the component (Figure 1c), larger in size (typically 5 that provides the food resource for Who Discovered the to 10 µm) than bacteria but still very most larval fish and for adults of many Microbial Food Web? small compared to zooplankton, are pelagic species.