004480000a2200121000450024501530000065000330015365000150018604100130020170000250021470000230023910000230026277300410028510aContributions of the long-term ecological research program: an expanded network of scientists, and programs can provide crucial comparative analyses14aProgramas de investigación14aEcología0 aInglés1 aBledsoe, Caroline S.1 aCallahan, James T.1 aFranklin, Jerry F.1 tBioscience316h7q509-523d1990g40