ࡱ> RTQ@ bjbj "4uu(((((((<!!!!!\<(<!!!!!!!!X(Z(Z(Z(Z(Z(Z($*Rg,l~(($!!$$~(((!!(&&&$(!(!X(&$X(&&((&!t! 0G!%&4&$(0(&,%,&<<((((,(&!"h&z"T"H!!!~(~(<<  %(<< 6Marine habitat types 6.1. Coastal lagoons General description and geographic variation No information generated. Community types/zonation and major gradients within the system (patterns) No information generated. Ecological integrity factors for condition Table xxx. Ecological integrity factors for condition of coastal lagoons Key FactorsJustification for Factor SelectionEcological Thresholds: (Minimum Integrity Threshold) Justification for Threshold Determination (e.g., Natural Range of Variation)Indicators for Field-Based MonitoringFactor PriorityBacteriological quality of the water The general health of a lagoon depends greatly on anthropogenic impacts. These are clearly expressed in the coliform concentration. Review FDA [Experts, please write out the full name of FDA. Thanks.]FDA norm for environmental health. Shellfish Sanitation Program Manual, FDA.Total coliforms Nutrients: N & P An excess of nutrients easily breaks the equilibrium of the system, leading to eutrophication. Varies by siteHigh and persistent nutrient {concentrations} lead to eutrophication, degrading the system. Low {concentrations of} nutrients reduce the carrying capacity of the system.O2 A reduction of the concentration of O2 can break the equilibrium of the system. Associated with over-saturation of the carrying capacity and an elevated time (t) of residence in the water. Varies by site. A prolonged period of less than 50% O2 saturation is risky. A low and persistent O2 saturation is associated with eutrophication of the system. Tends to be associated with a high T (Temperature) and C. [Experts, please indicate what C stands for. Thanks.]% of O2 saturation. (Seasonal; higher t in summer)Coverage of seagrass beds (ej. Zostera) The abundance and condition of the seagrass beds {literally "prairie"} is the essential support of the system. Reflects the general health of the system. Its reduction diminishes the biological richness of the system, {and} the carrying capacity. Is a source of productivity and has homeostatic functions: filter, stabilizer, substrate.negative tendency In San Quintin, Baja California, one % of the 15% indicates good condition. [Experts, please provide literature citation. Thanks.] % of coverage (annual) in space: map or satellite image. Comparative analysis study of diverse lagoons. Geomorphological (conservation)Human alterations (marinas, wave-breakers, ports, piers, etc.) radically modify the hydrology of the system, changing all its equilibrium.Continuos observation of the coastline and monitoring projects.Development in neighboring zones The eternal ?? {A word is missing from the original. It probably was "development"} directly affects the conservation of a lagoon. The proximity of settlements, industry, agriculture, tourism, etc., compromises its conservation.Appropriate distance (buffer zone) between the lagoon and intensive development. The immediate proximity of the system and the disturbance leads to the deterioration of the system.Study: development of models and carrying capacity of particular lagoons, analysis of the trophic web.DischargesThese are point sources of contamination (organic, coliforms, agricultural, industrial, etc.).In F [Experts, please indicate what F stands for. Thanks.] {In function} of the dilution capacity, which tends to be low for organic and none for industrial.Discharges should be avoided.Identification of species, density and biomass, distribution, vegetation maps.Abundance of green algae (Enteromorpha y Ulva)Indicates eutrophication of the system; excess of nutrients due to drainage.Develop an indicator. Information gaps and caveats Recommended priorities for conservation-driven research agenda and next steps Literature Cited Recommended resources Bardach JE (ed). 1998. Sustainable Aquaculture. John Wiley & Sons. New York, USA. Clark JR 1996. Coastal Zone Management Handbook. Lewis Publishers. 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