Modeling trophic interactions in Lake Kivu: What roles do exotics play?

An Ecopath model of the southern part of Lake Kivu, a deep African equatorial lake was constructed to quantitatively describe the possible impact of fish introductions in this ecosystem. This study is considered as an initial step in summarizing ecological and biological information, under a coherent framework, on this ecosystem. Fourteen compartments were considered. As a phytoplankton-based food web, it is observed that key food sources are not fully utilized as transfer efficiencies per trophic levels (TL) varies between 4.5 and 9.4%. Zooplankton plays a major role in transferring organic matter from TL1 to higher TLs due to the abundance of zooplanktivores. Shifts in food preferences and distribution of some of the fish functional groups were observed as a response to competition. The majority of fish biomass concentration is in TL3 (55%). The fishery is concentrated at TL3 and can, therefore, be consider as “immature”, sensu Odum. The direct and indirect effects of predation between system components (i.e. fish, invertebrates, phytoplankton and detritus) are quantitatively described and the possible influence and role in the ecosystem's functioning of introduced fish species are discussed.

[1]  A. Mazumder,et al.  Effects of planktivorous fish and nutrient additions on primary production of shallow versus deep (stratified) lake enclosures , 1996 .

[2]  F. Roest,et al.  The impact of an introduction of sardine into Lake Kivu , 1995 .

[3]  J. Micha,et al.  Régime alimentaire de quatre espèces du genre Haplochromis (Teleostéi, Cichlidae) du lac Ihema (Rwanda) , 1992 .

[4]  K. Weathers,et al.  Forest Ecosystem Responses to Exotic Pests and Pathogens in Eastern North America , 2006 .

[5]  J. Moreau,et al.  A Synoptic Ecopath model of biomass flows during two different static ecological situations in Lake Nakuru (Kenya) , 2001, Hydrobiologia.

[6]  E. Baras,et al.  Seasonal and diel variations in diet of the young stages of the fish Limnothrissa miodon in Lake Kivu, Eastern Africa , 2004, Journal of Tropical Ecology.

[7]  R. Naiman,et al.  Freshwater biodiversity: importance, threats, status and conservation challenges , 2006, Biological reviews of the Cambridge Philosophical Society.

[8]  Paul J. B. Hart,et al.  The Impact of Species Changes in African Lakes , 1995, Chapman & Hall Fish and Fisheries Series.

[9]  T. Valone,et al.  Positive and negative effects of exotic Erodium cicutarium on an arid ecosystem , 2006 .

[10]  L. Dyer,et al.  Top‐down and bottom‐up diversity cascades in detrital vs. living food webs , 2002 .

[11]  Mauricio Lima,et al.  Spread dynamics of invasive species. , 2006, Proceedings of the National Academy of Sciences of the United States of America.

[12]  M. Galal,et al.  The Biology of Oreochromis niloticus in a Polluted Canal , 2003, Ecotoxicology.

[13]  L. Kaufman,et al.  Human impacts on the African Great Lakes , 1997, Environmental Biology of Fishes.

[14]  D. Post,et al.  Studying invasion: have we missed the boat? , 2005 .

[15]  L. T. D. Morais,et al.  Comparative analysis of trophic structure and interactions of two tropical lagoons , 2006 .

[16]  G. Iwama,et al.  Oxygen consumption rates of tilapia in fresh water, sea water, and hypersaline sea water , 1997 .

[17]  R. Estrella,et al.  AN ANNOTATED CHECKLIST OF THE BIRDS , 1993 .

[18]  E. Pianka.  The structure of lizard communities , 1973 .

[19]  P. Yodzis,et al.  In search of operational trophospecies in a tropical aquatic food web , 1999 .

[20]  D. Simberloff,et al.  BIOTIC INVASIONS: CAUSES, EPIDEMIOLOGY, GLOBAL CONSEQUENCES, AND CONTROL , 2000 .

[21]  H. Mooney,et al.  Biodiversity and Ecosystem Function , 1994, Praktische Zahnmedizin Odonto-Stomatologie Pratique Practical Dental Medicine.

[22]  Michael J. Crawley,et al.  Colonization, Succession, and Stability , 1988 .

[23]  D. Pauly,et al.  Some new analytical and comparative methods for estimating the food consumption of fish , 1991 .

[24]  J. Lockwood,et al.  Biotic homogenization: a few winners replacing many losers in the next mass extinction. , 1999, Trends in ecology & evolution.

[25]  R. Herendeen.  Bottom-up and top-down effects in food chains depend on functional dependence: an explicit framework , 2004 .

[26]  E. Trewavas,et al.  Tilapiine Fishes of the Genera Sarotherodon, Oreochromis and Danakilia , 1983 .

[27]  J. Craig.  Human-induced changes in the composition of fish communities in the African Great Lakes , 1992, Reviews in Fish Biology and Fisheries.

[28]  J. Barth.  End of the road , 1960 .

[29]  T. Pitcher,et al.  An analysis of species changes in Lake Victoria: did the Nile perch act alone? , 1995 .

[30]  Raymond L. Lindeman.  The trophic-dynamic aspect of ecology , 1942 .

[31]  James H. Brown,et al.  The paradox of invasion , 2000 .

[32]  I. Winfield,et al.  Fish introductions and their management in the English Lake District , 2004 .

[33]  J. Coleman,et al.  Elevated CO2 increases productivity and invasive species success in an arid ecosystem , 2000, Nature.

[34]  J. P. Grime,et al.  Biodiversity and Ecosystem Functioning: Current Knowledge and Future Challenges , 2001, Science.

[35]  F. Castri,et al.  Biological Invasions: A Global Perspective , 1989 .

[36]  M. J. Pearce.  Effects of exploitation on the pelagic fish community in the south of Lake Tanganyika , 1995 .

[37]  Villy Christensen,et al.  Trophic models of aquatic ecosystems , 1993 .

[38]  R. Froese,et al.  Empirical relationships to estimate asymptotic length, length at first maturity and length at maximum yield per recruit in fishes, with a simple method to evaluate length frequency data , 2000 .

[39]  R. Ogutu-ohwayo,et al.  The decline of the native fishes of lakes Victoria and Kyoga (East Africa) and the impact of introduced species, especially the Nile perch, Lates niloticus, and the Nile tilapia, Oreochromis niloticus , 1990, Environmental Biology of Fishes.

[40]  M. Petrere,et al.  Reduction of a native fish fauna by alien species: an example from Brazilian freshwater tropical lakes , 2004 .

[41]  R. Ricklefs,et al.  Distributions of exotic plants in eastern Asia and North America. , 2006, Ecology letters.

[42]  M. Bruton.  The role of diel inshore movements by Clarias gariepinus (Pisces: Clariidae) for the capture of fish prey , 2010 .

[43]  D. Pauly,et al.  Primary production required to sustain global fisheries , 1995, Nature.

[44]  P. Plisnier,et al.  Analysis of trophic relationships in two shallow equatorial lakes Lake Naivasha (Kenya) and Lake Ihema (Rwanda) using a multispecifies trophic model , 1996, Hydrobiologia.

[45]  K. McCann.  The diversity–stability debate , 2000, Nature.

[46]  T. Caraco,et al.  Spatial dynamics of invasion: the geometry of introduced species. , 2005, Journal of theoretical biology.

[47]  D. Pauly,et al.  A trophic ecosystem model of Lake George, Uganda , 1993 .

[48]  R. Lowe‐Mcconnell.  Fish Faunas of the African Great Lakes: Origins, Diversity, and Vulnerability , 1993 .

[49]  H. H. D. Iongh,et al.  Feeding habits of the clupeid Limnothrissa miodon (Boulenger), in Lake Kivu , 1983, Hydrobiologia.

[50]  R. Paine,et al.  Effects of productivity, consumers, competitors, and El Niño events on food chain patterns in a rocky intertidal community. , 1996, Proceedings of the National Academy of Sciences of the United States of America.

[51]  E. Odum.  Fundamentals of ecology , 1972 .

[52]  E. Odum.  The strategy of ecosystem development. , 1969, Science.

[53]  D. Wilcove,et al.  QUANTIFYING THREATS TO IMPERILED SPECIES IN THE UNITED STATES , 1998 .

[54]  K. Irvine,et al.  Spatial and temporal patterns of zooplankton standing biomass and production in Lake Malawi , 1999 .

[55]  D. Pauly.  On the interrelationships between natural mortality, growth parameters, and mean environmental temperature in 175 fish stocks , 1980 .

[56]  Edward L. Mills,et al.  Exotic Species in the Great Lakes: A History of Biotic Crises and Anthropogenic Introductions , 1993 .

[57]  Mark A. Davis,et al.  Eight Ways to be a Colonizer; Two Ways to be an Invader. , 2000 .

[58]  H. Sarmento,et al.  Zooplankton of Lake Kivu, East Africa, half a century after the Tanganyika sardine introduction , 2006 .

[59]  V. Volterra.  Variations and Fluctuations of the Number of Individuals in Animal Species living together , 1928 .

[60]  C. Argillier,et al.  Contribution of native and non‐native species to fish communities in French reservoirs , 2004 .

[61]  K. Irvine,et al.  Spatial and temporal patterns of zooplankton standing biomass and production in Lake Malawi , 1999, Hydrobiologia.

[62]  H. Jannasch.  Methane oxidation in Lake Kivu (central Africa)1 , 1975 .

[63]  A. Covich,et al.  Predicting impact of freshwater exotic species on native biodiversity: Challenges in spatial scaling , 1998 .

[64]  W. V. Densen,et al.  The shift to smaller zooplankton in Lake Victoria cannot be attributed to the ‘sardine’ Rastrineobola argentea (Cyprinidae) , 2002 .

[65]  F. Witte,et al.  The use of perturbation as a natural experiment: Effects of predator introduction on the community structure of zooplanktivorous fish in Lake Victoria , 2000 .

[66]  V. Christensen.  Ecosystem maturity - towards quantification , 1995 .

[67]  T. Twongo.  Impact of fish species introductions on the tilapias of Lakes Victoria and Kyoga , 1995 .

[68]  Carl J. Walters,et al.  Ecopath with Ecosim: methods, capabilities and limitations , 2004 .

[69]  Elizabeth A. Fulton,et al.  Mortality and predation in ecosystem models: is it important how these are expressed? , 2003 .

[70]  J. Moreau.  Analysis of species changes in Lake Victoria using ECOPATH, a multispecies trophic model , 1995 .

[71]  K. Radway Allen,et al.  Relation Between Production and Biomass , 1971 .

[72]  D. Chitamwebwa,et al.  Impact of environmental change, species introductions and ecological interactions on the fish stocks of Lake Victoria , 1995 .

[73]  S. Carpenter,et al.  Relative importance of nutrient availability and food chain for size and community composition in phytoplankton , 1993 .

[74]  M. Lynch,et al.  Predation, enrichment, and phytoplankton community structure1 , 1981 .

[75]  Cole,et al.  Trophic cascades revealed in diverse ecosystems. , 1999, Trends in ecology & evolution.

[76]  Christopher F. Steiner.  THE EFFECTS OF PREY HETEROGENEITY AND CONSUMER IDENTITY ON THE LIMITATION OF TROPHIC‐LEVEL BIOMASS , 2001 .

[77]  Christopher Quince,et al.  Food web structure and the evolution of ecological communities , 2001, nlin/0105057.

[78]  E. Allen,et al.  Nonindigenous species introductions: a threat to Canada's forests and forest economy1 , 2002 .

[79]  Peter J. Morin,et al.  Environmental warming alters food-web structure and ecosystem function , 1999, Nature.

[80]  J. Snoeks.  The haplochromines (Teleostei, Cichlidae) of Lake Kivu (East Africa) : a taxonomic revision with notes on their ecology , 1994 .

[81]  John H. Lawton,et al.  Redundancy in Ecosystems , 1994 .

[82]  O. Petchey,et al.  Multi-trophic dynamics and ecosystem processes , 2002 .

[83]  J. Casselman,et al.  Stable isotope evidence for the food web consequences of species invasions in lakes , 1999, Nature.

[84]  William T. Peterson,et al.  Ecosystem Theory for Biological Oceanography. Proceedings of a Symposium Held March 16-23, 1984, in Quebec, Canada. Robert E. Ulanowicz , Trevor Platt , 1986 .

[85]  Peter Kareiva,et al.  Reducing the risks of nonindigenous species introductions. , 1995 .

[86]  P. Forget,et al.  Seed fate of two Sapotaceae species in a Guianan rain forest in the context of escape and satiation hypotheses , 2004, Journal of Tropical Ecology.

[87]  A. Payne.  The Ecology of Tropical Lakes and Rivers , 1986 .

[88]  L. Kaufman,et al.  Refugia for Endangered Fishes from an Introduced Predator in Lake Nabugabo, Uganda , 1996 .

[89]  B. Marshall.  Why is Limnothrissa miodon such a successful introduced species and is there anywhere else we should put it , 1995 .

[90]  P. Lazure,et al.  Quantitative description of habitat suitability for the juvenile common sole (Solea solea, L.) in the Bay of Biscay (France) and the contribution of different habitats to the adult population , 2003 .

[91]  Sara Gottlieb,et al.  Oysters and the Chesapeake Bay ecosystem: A case for exotic species introduction to improve environmental quality? , 1996 .

[92]  V. U. Ceccherelli,et al.  Seasonal and diel variations of zooplankton populations in a lagoon of the Po river delta , 1982 .

[93]  M. Rosenzweig.  The four questions: What does the introduction of exotic species do to diversity? , 2001 .

[94]  P. Plisnier,et al.  Trophic structure of Lake Tanganyika: carbon flows in the pelagic food web , 1999, Hydrobiologia.

[95]  Carl J. Walters,et al.  TRADE-OFFS IN ECOSYSTEM-SCALE OPTIMIZATION OF FISHERIES MANAGEMENT POLICIES , 2004 .

[96]  C. Kolar,et al.  Ecological Predictions and Risk Assessment for Alien Fishes in North America , 2002, Science.

[97]  R. Didham,et al.  Are invasive species the drivers of ecological change? , 2005, Trends in ecology & evolution.

[98]  J. Mandima.  The food and feeding behaviour of Limnothrissa miodon (Boulenger, 1906) in Lake Kariba, Zimbabwe , 1999, Hydrobiologia.

[99]  W. Wilson,et al.  Grazers and Diggers: Exploitation Competition and Coexistence among Foragers with Different Feeding Strategies on a Single Resource , 2000, The American Naturalist.

[100]  B. Gu,et al.  Feeding and control of blue-green algal blooms by tilapia (Oreochromis Niloticus) , 2006, Hydrobiologia.

[101]  D. Richardson,et al.  What attributes make some plant species more invasive , 1996 .

[102]  G. Bernacsek,et al.  Source Book for the Inland Fishery Resources of Africa , 1990 .

[103]  Julian D. Olden,et al.  On defining and quantifying biotic homogenization , 2006 .

[104]  J. Gurevitch,et al.  Are invasive species a major cause of extinctions? , 2004, Trends in ecology & evolution.

[105]  R. Welcomme.  Register of international transfers of inland fish species. , 1981 .

[106]  D. Pauly,et al.  Fishing down marine food webs , 1998, Science.

[107]  J. Snoeks,et al.  An Annotated Checklist of the Fishes of Rwanda (East Central Africa), With Historical Data on Introductions of Commercially Important Species , 2001 .

[108]  J. Kolding,et al.  Inshore fish population and species changes in Lake Kariba, Zimbabwe , 1995 .

[109]  David Tilman,et al.  Biodiversity as a barrier to ecological invasion , 2002, Nature.

[110]  S. Gaines,et al.  Species diversity: from global decreases to local increases , 2003 .

[111]  C. Folke,et al.  THE ECOLOGICAL FOOTPRINT CONCEPT FOR SUSTAINABLE SEAFOOD PRODUCTION: A REVIEW , 1998 .

[112]  E. Odum.  Fundamentals of Ecology. , 1955 .

[113]  Raymond L. Lindeman.  The trophic-dynamic aspect of ecology , 1942 .

[114]  H. Mooney.  ECOSYSTEM MANAGEMENT FOR SUSTAINABLE MARINE FISHERIES1 , 1998 .

[115]  A. Meyer,et al.  Origin of the Superflock of Cichlid Fishes from Lake Victoria, East Africa , 2003, Science.

[116]  I. Cowx,et al.  Shifts in the food of Nile tilapia, Oreochromis niloticus (L.) in Lake Victoria, Kenya , 2004 .

[117]  Zellig S. Harris,et al.  Mathematical structures of language , 1968, Interscience tracts in pure and applied mathematics.

[118]  D. Simberloff,et al.  Positive Interactions of Nonindigenous Species: Invasional Meltdown? , 1999, Biological Invasions.

[119]  Z. Tadesse.  The nutritional status and digestibility of Oreochromis niloticus L. diet in Lake Langeno, Ethiopia , 1999, Hydrobiologia.

[120]  B. Allanson,et al.  Unique qualities and special problems of the African Great Lakes , 1986, Environmental Biology of Fishes.

[121]  O. Svensson,et al.  The influence of multiple introduced predators on a littoral pond community , 2001 .

[122]  P. Vitousek,et al.  INTRODUCED SPECIES: A SIGNIFICANT COMPONENT OF HUMAN-CAUSED GLOBAL CHANGE , 1997 .

[123]  M. Isumbisho,et al.  Peche du Sambaza au filet maillant dans le lac Kivu , 1999 .

[124]  S. Saltveit,et al.  The effects of stocking Atlantic salmon, Salmo salar, in a Norwegian regulated river , 2006 .

[125]  D. Pimentel,et al.  Economic and environmental threats of alien plant, animal, and microbe invasions , 2001 .

[126]  T. Cunningham,et al.  MORPHOLOGICAL AND GENETIC DIFFERENTIATION IN APHIDS (APHIDIDAE) , 1981, The Canadian Entomologist.

[127]  T. Pitcher,et al.  Morphological and genetic differentiation of the African clupeid Limnothrissa miodon 34 years after its introduction to Lake Kivu , 1995 .

[128]  F. Sibbing,et al.  Barbus tanapelagius, A New Species from Lake Tana (Ethiopia): its Morphology and Ecology , 2000, Environmental Biology of Fishes.

[129]  T. Pitcher,et al.  An interdisciplinary evaluation of the status and health of African lake fisheries using a rapid appraisal technique , 1998 .

[130]  M. Loreau,et al.  Biodiversity and ecosystem functioning : synthesis and perspectives , 2002 .

[131]  Guido Caldarelli,et al.  Food Web Structure and the Evolution of Complex Networks , 2003 .

[132]  David Tilman,et al.  Plant diversity increases resistance to invasion in the absence of covarying extrinsic factors , 2000 .

[133]  Daniel Pauly,et al.  Predicting food consumption of fish populations as functions of mortality, food type, morphometrics, temperature and salinity , 1998 .

[134]  J. Stachowicz,et al.  BIODIVERSITY, INVASION RESISTANCE, AND MARINE ECOSYSTEM FUNCTION: RECONCILING PATTERN AND PROCESS , 2002 .

[135]  L. Persson.  Trophic cascades : abiding heterogeneity and the trophic level concept at the end of the road , 1999 .

[136]  H. Sarmento,et al.  Phytoplankton ecology of Lake Kivu (eastern Africa) , 2006 .

[137]  P. Hamilton,et al.  Effects of Nutrients and Planktivorous Fish on the Phytoplankton of Shallow and Deep Aquatic Systems , 1996 .

[138]  P. Spliethoff,et al.  Success of the Introduction of the Fresh Water Clupeid Limnothrissa miodon (Boulenger) in Lake Kivu , 1983 .

[139]  Osvaldo E. Sala,et al.  Global biodiversity in a changing environment : scenarios for the 21st century , 2002 .