This study presents a biotic index （∧） for measuring environmental quality in the coastal lagoons of the Mediterranean. Index A considers combined anthropogenic （pollution） and natural factors （prohibitive salin...This study presents a biotic index （∧） for measuring environmental quality in the coastal lagoons of the Mediterranean. Index A considers combined anthropogenic （pollution） and natural factors （prohibitive salinity, anoxia, toxic blooms, isolation from sea, etc.） of deterioration. The method is based on the principle of indicator species and on the conceptual scheme developed by Frisoni et al. （1984） according to which there are six possible sub-assemblages （Zones） of benthic macrofauna, each indicating a different level of environmental quality. The procedure requires defining the relative extent of the Zones in the lagoon under study, and the number of species and the mean biomass of benthic macrofauna present in each. The three metrics are applied in the index formula and the resulting number from one to ten indicates increasing environmental quality. The authors have validated the index by applying it to two lagoons, Lesina and Varano （S.Adriatic, Italy）.展开更多
This paper gives a detailed introduction to the biotic resources in Panxi Area and lists the most typical biotic resources in this area. The authors of this paper adopt the biotic resource abundance evaluation index m...This paper gives a detailed introduction to the biotic resources in Panxi Area and lists the most typical biotic resources in this area. The authors of this paper adopt the biotic resource abundance evaluation index model R1= （S0t -- S1t ） × S1i-1 （i= 1,2,3, …n） to make a quantitative calculation of the biotic resource abundance in this area, and the calculation results show that this area abounds in biotic resources. Through the analysis of the causes of abundant biotic resources in this area, the luxuriant biotic resources in Panxi Area are largely attributed to the complex and varied environment, atrocious climate in history and the introduction of alien species. The purpose of this paper is to point out that biotic resource exploitation is one of the driving forces of economic development in this area, and to emphasize the necessity of biotic resource preservation and its harmonious development with the environment.展开更多
文摘This study presents a biotic index （∧） for measuring environmental quality in the coastal lagoons of the Mediterranean. Index A considers combined anthropogenic （pollution） and natural factors （prohibitive salinity, anoxia, toxic blooms, isolation from sea, etc.） of deterioration. The method is based on the principle of indicator species and on the conceptual scheme developed by Frisoni et al. （1984） according to which there are six possible sub-assemblages （Zones） of benthic macrofauna, each indicating a different level of environmental quality. The procedure requires defining the relative extent of the Zones in the lagoon under study, and the number of species and the mean biomass of benthic macrofauna present in each. The three metrics are applied in the index formula and the resulting number from one to ten indicates increasing environmental quality. The authors have validated the index by applying it to two lagoons, Lesina and Varano （S.Adriatic, Italy）.
文摘This paper gives a detailed introduction to the biotic resources in Panxi Area and lists the most typical biotic resources in this area. The authors of this paper adopt the biotic resource abundance evaluation index model R1= （S0t -- S1t ） × S1i-1 （i= 1,2,3, …n） to make a quantitative calculation of the biotic resource abundance in this area, and the calculation results show that this area abounds in biotic resources. Through the analysis of the causes of abundant biotic resources in this area, the luxuriant biotic resources in Panxi Area are largely attributed to the complex and varied environment, atrocious climate in history and the introduction of alien species. The purpose of this paper is to point out that biotic resource exploitation is one of the driving forces of economic development in this area, and to emphasize the necessity of biotic resource preservation and its harmonious development with the environment.
