Long-term monitoring programs are fundamental to understanding the natural environment and effectively tackling major environmental problems. Yet they are often done very poorly and ineffectively. Effective Ecological Monitoring describes what makes successful and unsuccessful long-term monitoring programs. Short and to the point, it illustrates key aspects with case studies and examples. It is based on the collective experience of running long-term research and monitoring programs of the two authors - experience which spans more than 70 years. The book first outlines why long-term monitoring is important, then discusses why long-term monitoring programs often fail. The authors then highlight what makes good and effective monitoring. These good and bad aspects of long-term monitoring programs are further illustrated in the fourth chapter of the book. The final chapter sums up the future of long-term monitoring programs and how to make them better, more effective and better targeted.