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Trong chương 30, Jordan Smith mô tả hai con đường khác nhau trong việc đánh giá sức khỏe hệ sinh thái.một phương pháp là để mô tả tác động của căng thẳng trên trầm tích, môi trường sống, chất dinh dưỡng, vv và sau đó xác định mối quan hệ giữa các thành phần phi sinh học và sinh học của một cửa sông, phương tiện của một khái niệm phức tạp mô hình. Mô hình sau đó sẽ có kết quả đầu ra như các biến đáp ứng mô tả sức khỏe hệ sinh thái. Một phương pháp để đánh giá tình trạng. | 25 Habitat Affinities of Juvenile Goliath Grouper to Assess Estuarine Conditions Anne-Marie Eklund CONTENTS Introduction.393 Goliath Grouper.395 Ten Thousand Islands Estuary.395 Methods.397 Results.399 Goliath Grouper Habitat Description.401 Discussion.402 Conclusions and Research Needs.405 Acknowledgments.406 References.406 Introduction The overall goal in managing and monitoring an estuarine ecosystem should be a healthy system. Ecosystem health and ecosystem integrity have been variously defined as synonyms of each other and as synonyms of stability sustainability resilience balance and productivity Simberloff 1998 Jordan and Smith Chapter 30 this volume . A healthy ecosystem is one that also supports reasonable human uses through the long term Simberloff 1998 . To maintain a healthy estuarine system or to restore a degraded system to a stable and functioning state it is essential to be able to measure that system s health. When managing or restoring an estuary to a better condition it is important to understand its present state what the current trends are in the ecosystem s status and how long it will take to achieve a healthy system Simberloff 1998 . In Chapter 30 Jordan and Smith describe two different paths in assessing ecosystem health. One method is to describe effects of stressors on the sediment habitat nutrients etc. and then define the relationships between abiotic and biotic components of an estuary by means of a complex conceptual model. The model would then have outputs as response variables that describe ecosystem health. Another method to assess the status of an ecosystem is to define direct relationships between stressors and responses. Using the second method does not require a complete understanding of a conceptual model and all of the interrelationships and components of a complex food web Jordan and Smith Chapter 30 this volume . It does require the use of a suitable indicator that integrates the system s responses to stressors and predicts
