Research Papers


To download these papers sign in with your Penn Key

view by keywords
view by Authors
view by core area

Geomorphology

Brown, E. T., R. F. Stallard, M. C. Larsen, D. L. Bourlès, G. M. Raisbeck, and F. Yiou. 1998. Determination of predevelopment denudation rates of an agricultural watershed (cayaguas river, puerto rico) using in-situ-produced 10Be in river-borne quartz. Earth and Planetary Science Letters 160 (3-4): 723-8.

Geomorphology

Lal, D., CD Gallup, BLK Somayajulu, L. Vacher, MW Caffee, AJT Jull, RC Finkel, RC Speed, and A. Winters. 2005. Records of cosmogenic radionuclides be-10, al-26 and cl-36 in corals: First studies on coral erosion rates and potential of dating very old corals. Geochimica Et Cosmochimica Acta 69 (24) (DEC 15): 5717-28.

Sr isotope data from soils, water, and atmospheric inputs in a small tropical granitoid watershed in the Luquillo Mountains
of Puerto Rico constrain soil mineral development, weathering fluxes, and atmospheric deposition. This study provides
new information on pedogenic processes and geochemical fluxes that is not apparent in watershed mass balances based on
major elements alone. 87Sr/86Sr data reveal that Saharan mineral aerosol dust contributes significantly to atmospheric inputs.
Watershed-scale Sr isotope mass balance calculations indicate that the dust deposition flux for the watershed is
2100 ± 700 mg cm2 ka1. Nd isotope analyses of soil and saprolite samples provide independent evidence for the presence
of Saharan dust in the regolith. Watershed-scale Sr isotope mass balance calculations are used to calculate the overall
short-term chemical denudation velocity for the watershed, which agrees well with previous denudation rate estimates based
on major element chemistry and cosmogenic nuclides. The dissolved streamwater Sr flux is dominated by weathering of plagioclase
and hornblende and partial weathering of biotite in the saprock zone. A steep gradient in regolith porewater 87Sr/86Sr
ratio with depth, from 0.70635 to as high as 0.71395, reflects the transition from primary mineral-derived Sr to a combination
of residual biotite-derived Sr and atmospherically-derived Sr near the surface, and allows multiple origins of kaolinite to be
identified.

Geomorphology

Ziegler, K., OA Chadwick, AF White, and MA Brzezinski. 2005. (DSi)-si-30 systematics in a granitic saprolite, puerto rico. Geology 33 (10) (OCT): 817-20.

Geomorphology

Ryan, K. E., J. P. Walsh, D. R. Corbett, and A. Winter. 2008. A record of recent change in terrestrial sedimentation in a coral-reef environment, la parguera, puerto rico: A response to coastal development? Marine Pollution Bulletin 56 (6) (JUN): 1177-83.

Ecology

Demopoulos, Amanda W. J., Brian Fry, and Craig R. Smith. 2007. Food web structure in exotic and native mangroves: A hawaii-puerto rico comparison. Oecologia 153 (3) (SEP): 675-86.

Ecology

Smith, Joseph A. M., Leonard R. Reitsma, and Peter P. Marra. 2010. Moisture as a determinant of habitat quality for a nonbreeding neotropical migratory songbird. Ecology 91 (10) (OCT): 2874-82.

Ecology

Hendrix, PF, SL Lachnicht, MA Callaham, and XM Zou. 1999. Stable isotopic studies of earthworm feeding ecology in tropical ecosystems of puerto rico. Rapid Communications in Mass Spectrometry 13 (13): 1295-9.

Ecology

Dugger, KM, J. Faaborg, WJ Arendt, and KA Hobson. 2004. Understanding survival and abundance of overwintering warblers: Does rainfall matter? Condor 106 (4) (NOV): 744-60.

Ecology

Olsen, Ylva S., Sophia E. Fox, Erin L. Kinney, Mirta Teichberg, and Ivan Valiela. 2010. Differences in urbanization and degree of marine influence are reflected in delta(13)C and delta(15)N of producers and consumers in seagrass habitats of puerto rico. Marine Environmental Research 69 (3) (APR): 198-206.