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Home » Key Findings » Species group trends
Trends in groups of species
Generalist versus specialist species
Since the inception of the BMS in 1976, a general pattern in species trends has been the increase in the abundance (and distribution) of generalist species as they have benefited from warmer temperatures. In contrast, habitat specialist species have suffered badly over the same time period. Declines in the abundance of these species have occurred in parallel with severe contractions in range (Warren et al. 2001). In 2004 however, habitat specialist species faired relatively well, continuing an upward trend that has been apparent since 2000.
Variation in trends of generalist (red line, square symbols) and specialist species (blue line, circle symbols) measured from over 29 years (1976-2004).
