منابع مشابه
All you can eat: is food supply unlimited in a colonially breeding bird?
Food availability is generally considered to determine breeding site selection and therefore plays an important role in hypotheses explaining the evolution of colony formation. Hypotheses trying to explain why birds join a colony usually assume that food is not limited, whereas those explaining variation in colony size suggest that food is under constraint. In this study, we investigate the com...
متن کاملEctoparasitism shortens the breeding season in a colonial bird
When blood-feeding parasites increase seasonally, their deleterious effects may prevent some host species, especially those living in large groups where parasites are numerous, from reproducing later in the summer. Yet the role of parasites in regulating the length of a host's breeding season-and thus the host's opportunity for multiple brooding-has not been systematically investigated. The hig...
متن کاملBird-window collisions in the summer breeding season
Birds that reside in urban settings face numerous human-related threats to survival, including mortality from bird-window collisions (BWCs). Our current understanding of this issue has largely been driven by data collected during spring and fall migration, and patterns of collision mortality during the summer breeding season remain relatively unexplored. We assessed BWCs during four breeding se...
متن کاملThe relationship between childhood adversity and food insecurity: 'It's like a bird nesting in your head'.
OBJECTIVE Adverse childhood experiences, including abuse, neglect and household instability, affect lifelong health and economic potential. The present study investigates how adverse childhood experiences are associated with food insecurity by exploring caregivers' perceptions of the impact of their childhood adversity on educational attainment, employment and mental health. DESIGN Semi-struc...
متن کاملThe global food supply.
There is currently a wide divergence of opinion as to whether in the year 2000 there will be sufficient food supplies to feed a prospective world population of 7 billion. The pessimists warn that even before that time there may be widespread outbreaks of famine, complete exhaustion of our natural resources, a hopelessly deteriorated physical environment, and a world ruled by virtual chaos. The ...
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ژورنال
عنوان ژورنال: Science
سال: 1905
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.21.540.707