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. The state of a population of planktic foraminifers at acertain time reflects multiple processes in the upper ocean, includingenvironmental conditions to which the population was exposed during itsgrowth, the age of the cohorts, and spatiotemporal patchiness. We carriedout depth-stratified (0–60, 60–100 m) replicated sampling off PuertoRico in autumn 2012, revisiting three stations previously sampled in autumn 1994 and spring 1995, in order to analyze seasonal and interannualvariability of planktic foraminifers and the stable isotopic composition oftheir tests. The merged dataset from all three sampling campaigns allows usto assess short- and long-term changes in foraminiferal population dynamicsand the spatial assemblage coherency along the shelf edge. All threesample series cover more than 2 weeks during either spring (1995) orautumn (1994, 2012) and include the time of the full moon when reproductionof some surface-dwelling planktic foraminifers has been postulated to takeplace. Our analyses indicate that interannual variability affected thefaunal composition, and both autumn assemblages were characterized byoligotrophic tropical species, dominated by Trilobatus sacculifer and Globigerinoides ruber (white and pink variety).However, G. ruber (white) had a higher abundance in 1994 (37 %) than in 2012 (3.5 %), which may be partially due to increasing sea surface temperaturessince the 1990s. Between 60 and 100 m water depth, a different faunalcomposition with a specific stable oxygen isotope signature providesevidence for the presence of the Subtropical Underwater at the samplingsite. Measurements on T. sacculifer sampled in autumn 2012 revealed that test size,calcification and incidence of sac-like chambers continued to increase afterfull moon, and thus no relation to the synodic lunar reproduction cycle wasrecognized. During autumn 2012, outer bands of hurricane Sandy passedthe Greater Antilles and likely affected the foraminifers. Lower standingstocks of living planktic foraminifers and lower stable carbon isotopevalues from individuals collected in the mixed layer likely indicate theresponse to increased rainfall and turbidity in the wake of the hurricane.

Seasonal and interannual variability in population dynamics of planktic foraminifers off Puerto Rico (Caribbean Sea)