ABSTRACT
In Parts IV and V, we considered freshwater, estuarine, and marine ecosystems as habitat for ‘shes, evaluating the characteristics of each system for potential bene‘ts or constraints imposed on ‘shes that live in them. In Part VI, we will examine the inherent capacity of the ‘sh to respond to those characteristics and to environmental changes. Speci‘cally, we wish to understand how ‘sh morphology, physiology, and behavior are adaptive to abiotic and biotic factors of the environment that affect distribution, abundance, and ultimately species persistence. We will focus on adaptations of the individual, but we also will consider certain attributes of populations.
