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Titolo:
The function of marine critical transition zones and the importance of sediment biodiversity
Autore:
Levin, LA; Boesch, DF; Covich, A; Dahm, C; Erseus, C; Ewel, KC; Kneib, RT; Moldenke, A; Palmer, MA; Snelgrove, P; Strayer, D; Weslawski, JM;
Indirizzi:
Scripps Inst Oceanog, Marine Life Res Grp, La Jolla, CA 92093 USA Scripps Inst Oceanog La Jolla CA USA 92093 es Grp, La Jolla, CA 92093 USA Univ Maryland, Ctr Environm Studies, Cambridge, MD 21613 USA Univ Maryland Cambridge MD USA 21613 onm Studies, Cambridge, MD 21613 USA Colorado State Univ, Ft Collins, CO 80523 USA Colorado State Univ Ft Collins CO USA 80523 niv, Ft Collins, CO 80523 USA Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA Univ New Mexico Albuquerque NM USA 87131 Biol, Albuquerque, NM 87131 USA Swedish Museum Nat Hist, Dept Invertebrate Zool, SE-10405 Stockholm, Sweden Swedish Museum Nat Hist Stockholm Sweden SE-10405 0405 Stockholm, Sweden US Forest Serv, Pacific SW Res Stn, USDA, Inst Pacific Isl Forestry, Honolulu, HI 96813 USA US Forest Serv Honolulu HI USA 96813 Isl Forestry, Honolulu, HI 96813 USA Univ Georgia, Inst Marine, Sapelo Isl, GA 31327 USA Univ Georgia Sapelo Isl GA USA 31327 nst Marine, Sapelo Isl, GA 31327 USA Oregon State Univ, Dept Entomol, Corvallis, OR 97331 USA Oregon State Univ Corvallis OR USA 97331 Entomol, Corvallis, OR 97331 USA Univ Maryland, Dept Biol, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 Dept Biol, College Pk, MD 20742 USA Mem Univ Newfoundland, Fisheries Conservat Grp, St Johns, NF A1C 5R3, Canada Mem Univ Newfoundland St Johns NF Canada A1C 5R3 ohns, NF A1C 5R3, Canada Polish Acad Sci, Inst Oceanol, PL-81712 Sopot, Poland Polish Acad Sci Sopot Poland PL-81712 st Oceanol, PL-81712 Sopot, Poland
Titolo Testata:
ECOSYSTEMS
fascicolo: 5, volume: 4, anno: 2001,
pagine: 430 - 451
SICI:
1432-9840(200108)4:5<430:TFOMCT>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENGLAND SALT-MARSH; AMPHIPOD UHLORCHESTIA-SPARTINOPHILA; FRESH-WATER ECOSYSTEMS; SAN-FRANCISCO BAY; ORGANIC-MATTER; PHRAGMITES-AUSTRALIS; COMMUNITY STRUCTURE; SPECIES-DIVERSITY; CHESAPEAKE BAY; TUBIFICIDAE OLIGOCHAETA;
Keywords:
climate change; diversity; ecosystem function; estuaries; eutrophication; functional group; habitat alteration; mangrove; overfishing; salt marsh; species invasion; wetlands;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
189
Recensione:
Indirizzi per estratti:
Indirizzo: Levin, LA Scripps Inst Oceanog, Marine Life Res Grp, La Jolla, CA 92093 USA Scripps Inst Oceanog La Jolla CA USA 92093 Jolla, CA 92093 USA
Citazione:
L.A. Levin et al., "The function of marine critical transition zones and the importance of sediment biodiversity", ECOSYSTEMS, 4(5), 2001, pp. 430-451

Abstract

Estuaries and coastal wetlands are critical transition zones (CTZs) that link land, freshwater habitats, and the sea. CTZs provide essential ecological functions, including decomposition, nutrient cycling, and nutrient production, as well as regulation of fluxes of nutrients, water, particles, and organisms to and from land, rivers, and the ocean. Sediment-associated biota are integral to these functions. Functional groups considered essential to CTZ processes include heterotrophic bacteria and fungi, as well as many benthic invertebrates. Key invertebrate functions include shredding, which breaks down and recycles organic matter; suspension feeding, which collects and transports sediments across the sediment-water interface; and bioturbating, which moves sediment into or out of the seabed. In addition, macrophytes regulate many aspects of nutrient, particle, and organism dynamics above- and belowground. Animals moving within or through CTZs are vectors that transport nutrients and organic matter across terrestrial, freshwater, and marine interfaces. Significant threats to biodiversity within CTZs are posedby anthropogenic influences; eutrophication, nonnutrient pollutants, species invasions, overfishing, habitat alteration, and climate change affect species richness or composition in many coastal environments. Because biotic diversity in marine CTZ sediments is inherently low whereas their functional significance is great, shifts in diversity are likely to be particularly important. Species introductions (from invasion) or loss (from overfishing or habitat alteration) provide evidence that single-species changes can have overt, sweeping effects on CTZ structure and function. Certain species may be critically important to the maintenance of ecosystem functions in CTZseven though at present there is limited empirical evidence that the numberof species in CTZ sediments is critical. We hypothesized that diversity isindeed important to ecosystem function in marine CTZs because high diversity maintains positive interactions among species (facilitation and mutualism), promoting stability and resistance to invasion or other forms of disturbance. The complexity of interactions among species and feedbacks with ecosystem functions suggests that comparative (mensurative) and manipulative approaches will be required to elucidate the role of diversity in sustaining CTZ functions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 02:47:41