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Structural Degradation in Mediterranean Sea Food Webs: Testing Ecological Hypotheses Using Stochastic and Mass-Balance Modelling

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Abstract

Human-mediated disturbances such as fishing, habitat modification, and pollution have resulted in significant shifts in species composition and abundance in marine ecosystems which translate into degradation of food-web structure. Here, we used a comparative ecological modelling approach and data from two food webs (North-Central Adriatic and South Catalan Sea) and two time periods (mid-late 1970s and 1990s) in the Mediterranean Sea to evaluate how changes in species composition and biomass have affected food-web properties and the extent of ecosystem degradation. We assembled species lists and ecological information for both regions and time periods into stochastic structural and mass-balance food-web models, and compared the outcomes of 22 food-web properties. Our results show strong similarities in structural food-web properties between the North-Central Adriatic and South Catalan Seas indicating similar ecosystem structure and levels of ecological degradation between regions and time periods. In contrast, a comparison with other published marine food webs (Caribbean, Benguela, and US continental shelf) suggested that Mediterranean webs are in an advanced state of ecological degradation. This was reflected by lower trophic height, linkage density, connectance, omnivory, species involved in looping, trophic chain length and fraction of biomass at higher trophic levels, as well as higher generality and fraction of biomass at lower trophic levels. An analysis of robustness to simulated species extinction revealed lower robustness to species removals in Mediterranean webs and corroborated their advanced state of degradation. Importantly, the two modelling approaches used delivered comparable results suggesting that they both capture fundamental information about how food webs are structured.

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References

  • AAVV. 2008. Large marine ecosystems webpage: www.edc.uri.edu/lme. The Mediterranean LME

  • Agostini V, Bakun A. 2002. “Ocean triads” in the Mediterranean Sea: physical mechanisms potentially structuring reproductive habitat suitability (with example application to European anchovy, Engraulis encrasicolus). Fish Oceanogr 11(3):129–42

    Article  Google Scholar 

  • Anonymous. 2004. Net fishing overview—St. Croix, US Virgin Islands. Management implications for restrictions on the use of gill and trammel nets. Division of Fish and Wildlife Department of Planning and Natural Resource Government of the Virgin Islands, 11 pp

  • Bas C, Maynou F, Sardà F, Lleonart J. 2003. Variacions demogràfiques a les poblacions d’espècies demersals explotades: els darrers quaranta anys a Blanes i Barcelona. Institut d’Estudis Catalans, Sec Ciènc Biol 135:202

    Google Scholar 

  • Bascompte J, Melian CJ, Sala E. 2005. Interaction strength combinations and the overfishing of a marine food web. Proc Natl Acad Sci USA 102 (15):5443–7

    Google Scholar 

  • Baum J, Myers RA, Kehler DG, Worm B, Harley SJ, Doherty PA. 2003. Collapse and conservation of shark populations in the Northwest Atlantic. Science 299:389–92

    Article  PubMed  CAS  Google Scholar 

  • Bearzi G, Holcer D, Notarbartolo Di Sciara G. 2004. The role of historical dolphin takes and habitat degradation in shaping the present status of northern Adriatic cetaceans. Aquat Conserv Mar Freshw Ecosyst 14: 363–79

    Article  Google Scholar 

  • Benovic A, Lucic D. 1996. Comparison of hydromedusae findings in the northern and southern Adriatic Sea. Sci Mar 60:129–35

    Google Scholar 

  • Bersier L Banasek-Richter C, et al. 2002. Quantitative descriptors of food-web matrices. Ecology 70:1450–62

    Google Scholar 

  • Bianchi CN, Morri C. 2000. Marine biodiversity of the Mediterranean Sea: situation, problems and prospects for future research. Mar Pollut Bull 40(5):367–76

    Article  CAS  Google Scholar 

  • Bombace G, Grati F. 2007. Che succede alle risorse di pesca del Mediterraneo? Notiziario della Società Italiana di Biologia Marina 51:29–38

    Google Scholar 

  • Bosc E, Bricau A, Antoine D. 2004. Seasonal and interannual variability in algal biomass and primary production in the Mediterranean Sea, as derived from 4 years of SeaWiFS observations. Global Biogeochem Cycles, 18(GB1005):17

    Google Scholar 

  • Bozzano A, Sardà F, Ríos J. 2005. Vertical distribution and feeding patterns of the juvenile European hake, Merluccius merluccius in the NW Mediterranean. Fish Res 73(1–2):29–36

    Article  Google Scholar 

  • Christensen V. 1995. Ecosystem maturity—towards quantification. Ecol Model 77:3–32

    Article  Google Scholar 

  • Christensen V, Pauly D. 1993. Trophic models of aquatic ecosystems. ICLARM conference proceeding 26, Manila, 390 pp

  • Christensen V, Pauly D. 1998. Changes in models of aquatic ecosystems approaching carrying capacity. Ecol Appl 8(Suppl 1):104–9

    Google Scholar 

  • Christensen V, Walters C. 2004. Ecopath with Ecosim: methods, capabilities and limitations. Ecol Model 172(2–4):109–39

    Article  Google Scholar 

  • CIESM. 2000. Fishing down the Mediterranean food webs? CIESM Workshop Series, 12:99 pp. Kerkyra, 26–30 July 2000

  • Coll M. 2006. Trophic web modelling and ecological indicators for assessing ecosystem impacts of fishing in the Mediterranean Sea. Ph.D. Thesis. Autonomous University of Barcelona. Spain

  • Coll M, Shannon LJ, Moloney CL, Palomera I, Tudela S. 2006a. Comparing trophic flows and fishing impacts of a NW Mediterranean ecosystem with coastal upwellings by means of standardized ecological models and indicators. Ecol Model 198:53–70

    Article  Google Scholar 

  • Coll M, Palomera I, Tudela S, Sardà F. 2006b. Trophic flows, ecosystem structure and fishing impacts in the South Catalan Sea, Northwestern Mediterranean. J Mar Syst 59:63–96

    Article  Google Scholar 

  • Coll M, Santojanni A, Palomera I, Tudela S, Arneri E. 2007. An ecosystem model of the Northern and Central Adriatic Sea: analysis of ecosystem structure and fishing impacts. J Mar Syst 67:119–54

    Article  Google Scholar 

  • Coll M, Palomera I, Tudela S, Dowd M. 2008. Food-web dynamics in the South Catalan Sea ecosystem (NW Mediterranean) for 1978–2003. Ecol Model 217(1–2):95–116

    Google Scholar 

  • Cury PM, Shannon LJ, Shin Y-J. 2003. The functioning of marine ecosystems: a fisheries perspective p. 103–123. In: Sinclair M, Valdimarsson G, Eds. Responsible fisheries in the marine ecosystem. FAO and CABI Publishing, UK, 426 pp

  • Cutting C. 1956. Fish saving. A history of fish processing from ancient to modern times. New York: Philosophical Library

    Google Scholar 

  • Daskalov G, Grishin AN, Rodionov S, Mihneva V. 2007. Trophic cascades triggered by overfishing reveal possible mechanisms of ecosystem regime shifts. Proc Natl Acad Sci USA 104(25):10518–23

    Google Scholar 

  • Dell AI, Kokkoris GD, Banasek-Richter C, Bersier L-F, Dunne JA, Kondoh M, Romanuk TN, Martinez ND. 2005. How do complex food webs persist in nature? In: de Ruiter MPC, Wolters V, Moore JC, Eds. Dynamic food webs: multispecies assemblages, ecosystem development and environmental change. Academic Press. pp 425–36

  • Dunne JA. 2005. The network structure of food webs. ecological networks: linking structure to dynamics in food webs. In: Pascual M, Dunne JA. Oxford: Oxford University Press. pp 27–86

  • Dunne JA., Williams RJ, Martinez ND. 2002. Network structure and biodiversity loss in food webs: robustness increases with connectance. Ecol Lett 5:558–67

    Article  Google Scholar 

  • Dunne JA, Williams RJ, Martinez ND. 2004. Network structure and robustness of marine food webs. Mar Ecol Prog Ser 273:291–302

    Article  Google Scholar 

  • Estrada M. 1996. Primary production in the Northwestern Mediterranean. Sci Mar 60(Suppl 2):55–64

    Google Scholar 

  • Fagan WF. 1997. Omnivory as a stabilizing feature of natural communities. Am Nat, 150:554–67

    Article  PubMed  CAS  Google Scholar 

  • Ferretti F, Myers RA, Serena F, Lotze HK. 2008. Losing of large predatory sharks from the Mediterranean Sea. Conserv Biol DOI:10.1111/j.1523-1739.2008.00938.x

  • Field JG, Crawford RJM, Wickens PA, Moloney CL, Cochrane KL, Villacastin-Herrero CA. 1991. Network analysis of Benguela pelagic food webs. Benguela ecology programme, workshop on seal-fishery biological interactions. University of Cape Town, 16–20 September, BEP/SW91/M5a

  • Florido D. 2004. The bio-economic crisis of “Almadraba” (Tuna Trap-net) fishing from the 14th to the 19th centuries: economic, social, political and ideological factors. HMAP-Mediterranean workshop (Barcelona, 20–23 September 2004)

  • Fulton EA, Smith ADM, Johnson CR. 2003. Effect of complexity on marine ecosystem models. Mar Ecol Prog Ser 253:1–16

    Article  Google Scholar 

  • Fulton EA, Smith ADM. 2004. Lessons learnt from a comparison of three ecosystem models for Port Phillip Bay, Australia. In: Shannon LJ, Cochrane KL, Pillar SC, Eds. An ecosystem approach to fisheries in the southern Benguela. Afr J Mar Sci 26:219–43

    Google Scholar 

  • Galil BS. 2000. A sea under siege—alien species in the Mediterranean. Biol Invasions 2:177–86

    Article  Google Scholar 

  • Garrido, A. 2006. Evolution of fishery technologies and uses of territory: a long term point of view. In: (HMAP) History of marine animal population—the Mediterranean and Black Sea Second workshop—human-environment interactions in the Mediterranean Sea since the roman period until the 19th century: an historical and ecological perspective on fishing activities. Chioggia, Venice, the 27th–29th of September 2006

  • Griffiths CL, Van Sittert L, et al. 2004. Impacts of human activities on marine animal life in the Benguela: a historical overview. Oceanogr Mar Biol Ann Rev 42:303–92

    Article  Google Scholar 

  • Groombridge B. 1990. Marine turtles in the Mediterranean: distribution, population status, conservation. European Council, Nature and environment series, n° 48. Strasbourg, France

  • Heymans JJ, Baird D. 2000. Network analysis of the Northern Benguela ecosystem by menas of NETWRK and Ecopath. Ecol Model 131 (2/3):97–119

    Article  Google Scholar 

  • Hughes JD. 1996. Pan’s travail. Environmental problems of the ancient Greeks and Romans. John Hopkins University Press, 277 pp

  • Jackson JBC, Kirby C, others 2001. Historical overfishing and the recent collapse of coastal ecosystems. Science 293:629–38

    Article  PubMed  CAS  Google Scholar 

  • Jackson JBC. 2006. When ecological pyramids were upside down. Whales, whaling and ocean ecosystems. In: Estes JA, Demaster DP, Doak DF, Williams TM, Brownell RJR. Berkeley, Los Angeles: University of California Press. pp 27–37

  • Jennings S, Greenstreet SPR, Hill L, Piet GJ, Pinnegar JK, Warr KL. 2002. Long-term trends in the trophic structure of the North Sea fish community: evidence from stable-isotope analysis, size-spectra and community metrics. Mar Biol 141:1085–97

    Article  Google Scholar 

  • Kideys AE. 2002. Fall and rise of the Black Sea ecosystem. Science 297:1482–4

    Article  PubMed  CAS  Google Scholar 

  • Legovic T., Justic D. 1997. When do phytoplankton blooms cause the most intense hypoxia in the northern Adriatic Sea? Oceanol Acta 20:91–9

    Google Scholar 

  • Libralato S, Coll M, Tudela S, Palomera I, Pranovi F. 2005. Quantifying ecosystem overfishing with a new index of fisheries’ impact on marine trophic webs. ICES-CIEM international council for the exploration of the sea annual science conference. Alberdeen, 20–24 September. ICES-CM 2005/M: 23

  • Libralato S, Coll M, Tudela S, Palomera I, Pranovi F. 2008. Novel index for quantification of ecosystem effects of fishing as removal of secondary production. Mar Ecol–Progress Ser, 355:107–29

    Article  Google Scholar 

  • Lotze HK, Milewski I. 2004. Two centuries of multiple human impacts and successive changes in a North Atlantic food web. Ecol Appl 14(5):1424–47

    Article  Google Scholar 

  • Lotze HK, Reise K, Worm B, van Beusekom J, Busch M, Ehlers A, Heinrich D, Hoffman RC, Holm P, Jensen C, Knottnerus OS, Langhanki N, Prummel W, Vollmer M, Wolff WJ. 2005. Human transformations of the Wadden sea ecosytem through time: a synthesis. Helgoland Mar Res 59(1):84–95

    Article  Google Scholar 

  • Lotze HK, Lenihan HS, et al. 2006. Depletion, degradation and recovery potential of estuaries and coastal seas. Science 312:1806–9

    Article  PubMed  CAS  Google Scholar 

  • Lloret J., Palomera I., Salat J., Sole I., 2004. Impact of freshwater input and wind on landings of anchovy (Engraulis encrasiclous) and sardine (Sardina pilchardus) in shelf waters surrounding the Ebro River delta (northwestern Mediterranean). Fish Oceanogr 13(2):102–10

    Article  Google Scholar 

  • Margalef R. 1968. Perspectives in theoretical ecology. Chicago, London: The University of Chicago Press. 111 pp

    Google Scholar 

  • Margalef R. 1985. Introduction to the Mediterranean. In: Margalef R, Ed. Key environments: Western Mediterranean. Pergamon Press, New York, 362 pp

    Google Scholar 

  • Martinez N. 1999. Artifacts or attributes? Effects of resolution on little rock lake food web. Ecol Monogr, 61(4):367–92

    Article  Google Scholar 

  • McCann K, Hastings A. 1997. Re-evaluating the omnivory-stability relationship in food webs. Proc R Soc Lond B 264:1249–54

    Article  Google Scholar 

  • McCann K. 2007. Protecting biostructure. Nature 446:29

    Article  PubMed  CAS  Google Scholar 

  • Megalofonou P., Yannopoulos C, Damalas D, De Metrio G, Deflorio M, JM de la Serna. 2005. Incidental catch and estimated discards of pelagic sharks from the swordfish and tuna fisheries in the Mediterranean Sea. Fish Bull 103:620–34

    Google Scholar 

  • Moloney CL, Jarre A, Arancibia H, Bozec Y-M, Neira S, Roux J-P, Shannon LJ. 2005. Comparing the Benguela and Humboldt marine upwelling ecosystems with indicators derived from inter-calibrated models. ICES J Mar Sci 62 (3):493–502

    Article  Google Scholar 

  • Myers RA, Worm B. 2005. Extinction, survival or recovery of large predatory fishes. Philos Trans R Soc B 360:13–20

    Article  Google Scholar 

  • Odum EP. 1969. The strategy of ecosystem development. Science 104:262–70

    Article  Google Scholar 

  • Odum EP. 1985. Trends expected in stressed ecosystems. BioScience 35(7):419–22

    Article  Google Scholar 

  • Okey TA, Pugliese R. 2002. A preliminary Ecopath model of the Atlantic continental shelf adjacent to the South-eastern United States. Fisheries centre research reports, 9(4), University of British Columbia, Vancouver, Canada

  • Opitz S. 1996. Trophic interactions in Caribbean coral reefs. ICLARM Technical Report, 43. ICLARM, Manila, 341 pp

  • Palomera I, Olivar MP, Salat J, Sabatés A, Coll M, García A, Morales-Nin B. 2007. Small pelagic fish in the NW Mediterranean Sea: an ecological review. Prog Oceanogr 74:377–96

    Article  Google Scholar 

  • Pandolfi J., Bradbury RH, et al. 2003. Global trajectories of the long-term decline of coral reef ecosystems. Science 301:955–8

    Article  PubMed  CAS  Google Scholar 

  • Papaconstantinou C, Farrugio H. 2000. Fisheries in the Mediterranean. Mediterr Mar Sci, 1(1):5–18

    Google Scholar 

  • Pauly D, Christensen V, Dalsgaard J, Froese R, Torres FJ. 1998. Fishing down marine food webs. Science 279:860–3

    Article  PubMed  CAS  Google Scholar 

  • Pauly D, Christensen V, Guénette S, Pitcher T, Sumaila UR, Walters C, Watson R, Zeller D. 2002. Towards sustainability in world fisheries. Nature 418:689–95

    Article  PubMed  CAS  Google Scholar 

  • Pauly D, Christensen V, Walters C. 2000. Ecopath, ecosim and ecospace as tools for evaluating ecosystem impact of fisheries. ICES J Mar Sci 57:697–706

    Article  Google Scholar 

  • Piccinetti C, Piccinetti Mandrin G. 1984. Distribuzione di Pelagia noctiluca in Adriatico dal 1976 al 1983. Nova Thalassia, 6:51–68

    Google Scholar 

  • Pinardi N, Arneri E, Crise A, Ravaioli M, Zavatarelli M. The physical, sedimentary and ecological structure and variability of shelf areas in the Mediterranean Sea (27). In: Robinson AR, Brink KH, Eds. The Sea, vol 14. Chapter 23:1243–330. Harvard University Press (in press)

  • Pinnegar JK, Blanchard JL, Mackinson S, Scott RD, Duplisea DE. 2005. Aggregation and removal of weak-links in food-web models: system stability and recovery form disturbance. Ecol Model 184:229–48

    Article  Google Scholar 

  • Plagányi ÉE. 2007. Models for an ecosystem approach to fisheries. FAO fisheries technical paper, N° 477. Rome, FAO 108 pp

  • Romanuk T, Jackson LJ, Post JR, McCauley E, Martinez ND. 2006. The structure of food webs along river networks. Ecography 29:1–8

    Article  Google Scholar 

  • Sabatés A, Martín P, Lloret J, Raya V. 2006. Sea warming and fish distribution: the case of the small pelagic fish, Sardinella aurita, in the western Mediterranean. Global Change Biol 12:2209–19

    Article  Google Scholar 

  • Sala E. 2004. The past and present topology and structure of Mediterranean subtidal rocky-shore food webs. Ecosystems 7:333–40

    Article  Google Scholar 

  • Santojanni A, Arneri E, Barry C, Belardinelli A, Cingolani N, Giannetti G, Kirkwood G. 2003. Trends of anchovy (Engraulis encrasicolus, L.) biomass in the northern and central Adriatic Sea. Sci Mar 67(3):327–40

    Article  Google Scholar 

  • Santojanni A, Arneri E, Bernardini V, Cingolani N, Di Marco M, Russo A. 2006. Effects of environmental variables on recruitment of anchovy in the Adriatic Sea. Clim Res 31:181–93

    Article  Google Scholar 

  • Shannon LJ, Moloney C, Jarre-Teichmann A, Field JG. 2003. Trophic flows in the southern Benguela during the 1980s and 1990s. J Mar Syst 39:83–116

    Article  Google Scholar 

  • Shannon LJ, Coll M, Cury P, Neira S, Roux J-P. Role of small pelagic fish on the ecosystem. In: Checkley DM, Roy C, Alheit J, Oozeki Y, Eds. Clim Change Small Pelagic Fish (in press)

  • Shin Y-J, Shannon LJ, Cury P. 2004. Simulations of fishing effects on the Southern Benguela fish community using an individual-based model. Learning from a comparison with Ecosim. S Afr J Sci 26:95–115

    Google Scholar 

  • SOFIA. 2004. Review of the state of world marine fishery resources. FAO Rome, 153 pp

  • SOFIA. 2006. Review of the state of world marine fishery resources. FAO Rome, 235 pp

  • Srinivasan UT, Dunne JA, Harte J, Martinez ND. 2007. Response of complex food webs to realistic extinction sequences. Ecology, 88(3):671–82

    Article  PubMed  Google Scholar 

  • Steneck RS, Carlton JT. 2001. Human alterations of marine communities. Students beware! Marine community ecology. In: Bertness MD, Gaines SD, Hay ME. Sinauer Associates: Sunderland, Massachusetts. pp 445–68

  • Tsounis G, Rossi S, Gilli JM, Arntz WE. 2007. Red coral fishery at the Costa Brava (NW Mediterranean): case study of an overharvested precious coral. Ecosystems 10:975–86

    Article  Google Scholar 

  • Tudela S. 2004. Ecosystem effects of fishing in the Mediterranean: an analysis of the major threats of fishing gear and practices to biodiversity and marine habitats. General Fisheries Commission for the Mediterranean (FAO). Studies and Reviews, 74. 58 pp

  • Turley CM. 1999. The changing Mediterranean Sea—a sensitive ecosystem? Prog Oceanogr 44:387–400

    Article  Google Scholar 

  • Walsh JJ. 1981. A carbon budget for overfishing off Peru. Nature 290:300–4

    Article  Google Scholar 

  • Williams RJ, Martinez ND. 2000. Simple rules yield complex food webs. Nature 404:180–3

    Article  PubMed  CAS  Google Scholar 

  • Williams RJ, Berlow EL, Dunne JA, Barabasi A-L, Martines N. 2002. Two degrees of separation in complex food webs. Proc Natl Acad Sci USA 99(20):12913–6

    Google Scholar 

  • Worm B, Barbier EB, et al 2006. Impacts on biodiversity loss on ocean ecosystem services. Science 314:787–90

    Article  PubMed  CAS  Google Scholar 

  • Yodziz P. 1998. Local trophodynamics and the interaction of marine mammals and fisheries in the Benguela ecosystem. J Anim Ecol 67:635–58

    Article  Google Scholar 

  • Zavatarelli M, Raicich F, Bregant D, Russo A, Artegiani A. 1998. Climatological biogeochemical characteristics of the Adriatic Sea. J Mar Syst 18:227–63

    Article  Google Scholar 

  • Zotier R, Bretagnolle V, Thibault J-C. 1999. Biogeography of the marine birds of a confined sea, the Mediterranean. J Biogeogr 26:297–313

    Article  Google Scholar 

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Acknowledgements

We acknowledge the co-authors of food-web models of the Mediterranean Sea: Isabel Palomera, Sergi Tudela, Francesc Sarda, Alberto Santojanni and Enrico Arneri. We also thank the authors of the non-Mediterranean food-web models used in this work: Jenniffer Dunne, Lynne Shannon, Silvia Opitz and Tom Okey. Thanks to Colette Wabnitz for advice on Caribbean Sea catch data, Jennifer Dunne, Neo Martinez and Paul Yoon for supporting this work and giving advice on the Niche model and Villy Christensen for giving advice on the Ecopath model. MC was partially supported financially by a postdoctoral fellowship from the Spanish Ministry of Education and Science. This work was financially supported by the Sloan Foundation (Census of Marine Life, FMAP program) and the Natural Sciences and Engineering Research Council of Canada with grants to HKL. We thank two anonymous reviewers for comments and corrections on the manuscript.

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  1. Department of Biology, Dalhousie University, 1355 Oxford Street, Halifax, NS, Canada, B3H4J1

    Marta Coll, Heike K. Lotze & Tamara N. Romanuk

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Coll, M., Lotze, H.K. & Romanuk, T.N. Structural Degradation in Mediterranean Sea Food Webs: Testing Ecological Hypotheses Using Stochastic and Mass-Balance Modelling. Ecosystems 11, 939–960 (2008). https://doi.org/10.1007/s10021-008-9171-y

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