Are fewer fledglings per breeding attempt produced on less productive (low quality?) territories than on more productive (high quality?) territories?

Linear regressions of mean numbers of fledglings produced per breeding attempt on low productivity vs. high productivity territories and the sum total fledglings produced by 3 different cohorts of territories (36 territories monitored 20 years [1991‒2010]; 25 territories monitored 19 years [1992–2010]; and 18 territories monitored 18 years [1993–2010]) by northern goshawks in Arizona, USA. Territories in each cohort are divided into 4 quadrants based on their mean total fledglings produced per study period (vertical line) and means of numbers of fledglings produced per breeding attempt (horizontal line). Means (±SE) and ranges of numbers of years that territories were active (A; eggs laid), and means (±SE) and ranges of nest failures (F) are provided for each quadrant.