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Can an ancient ocean shoreline set the stage for a tropical forest of today?
![Dawn mist covers NSF's Luquillo Critical Zone Observatory and Long-Term Ecological Research sites.](/news/mmg/media/images/242383-El_Yunque morning mist_f.jpg)
Dawn mist covers NSF's Luquillo Critical Zone Observatory and Long-Term Ecological Research sites.
Credit: Wikimedia Commons
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![Water flows along what scientists call a knickpoint: a change in the slope of a river.](/news/mmg/media/images/242383-water knickpoints_f.jpg)
Water flows along what scientists call a knickpoint: a change in the slope of a river.
Credit: Gilles Brocard
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![LiDAR map of Luquillo's Rio Blanco watershed (green), streams (blue), and knickpoints (yellow).](/news/mmg/media/images/242383-LiDAR knickpoints CZO LTER_f.jpg)
LiDAR map of Luquillo's Rio Blanco watershed (green), streams (blue), and knickpoints (yellow).
Credit: E. Harrison/J. Willenbring
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![A Luquillo waterfall; such waterfalls are often found at river knickpoints.](/news/mmg/media/images/242383-Yunque_waterfall_f.jpg)
A Luquillo waterfall; such waterfalls are often found at river knickpoints.
Credit: Wikimedia Commons
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![Meteorological station on a clear day in the cloud forest of Puerto Rico's Luquillo Mountains.](/news/mmg/media/images/242383-luq-met station_f.jpg)
Meteorological station on a clear day in the cloud forest of Puerto Rico's Luquillo Mountains.
Credit: NSF Luquillo LTER site
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![Scientists at Luquillo have shown that carbon cycling by tropical forests is sensitive to climate.](/news/mmg/media/images/242383-luq-carbon cycling_f.jpg)
Scientists at Luquillo have shown that carbon cycling by tropical forests is sensitive to climate.
Credit: NSF Luquillo LTER site
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![Representation of the complex food web in the tropical forest of the Luquillo Mountains.](/news/mmg/media/images/242383-luq-food web forest_f.jpg)
Representation of the complex food web in the tropical forest of the Luquillo Mountains.
Credit: NSF Luquillo LTER site
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