Family life heats up for Mexican jays.Mexican jays in southeastern Arizona are starting families about 10 days earlier than they did in 1971. The beginnings of nest building and egg laying in a jay population under long-term study have jumped forward, note Jerram L. Brown of the State University of New York (body) State University of New York - (SUNY) The public university system of New York State, USA, with campuses throughout the state. at Albany and his colleagues. During the same period, monthly minimum temperatures tended to creep up Verb 1. creep up - advance stealthily or unnoticed; "Age creeps up on you" sneak up advance, march on, move on, progress, pass on, go on - move forward, also in the metaphorical sense; "Time marches on" , the researchers report in the May 11 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES The Proceedings of the National Academy of Sciences of the United States of America, usually referred to as PNAS, is the official journal of the United States National Academy of Sciences. . Biologists have long predicted that climatic warming could fast-forward animal reproduction. Yet, Brown and his colleagues observe that there hasn't been much documentation for that trend in North America North America, third largest continent (1990 est. pop. 365,000,000), c.9,400,000 sq mi (24,346,000 sq km), the northern of the two continents of the Western Hemisphere. . The problem deserves more attention, they warn. A recent study of grasslands showed minimum temperature gains paralleling changes in the mix of species. |
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