Lunar periodicity in the shell flux of planktonic foraminifera in the Gulf of Mexico

Biogeosciences
By: , and 

Links

Abstract

Synchronised reproduction offers clear benefits to planktonic foraminifera – an important group of marine calcifiers – as it increases the chances of successful gamete fusion. Such synchrony requires tuning to an internal or external clock. Evidence exists for lunar reproductive cycles in some species, but its recognition in shell flux time series has proven difficult, raising questions about reproductive strategies. Using spectral analysis of a 4-year time series (mostly at weekly resolution) from the northern Gulf of Mexico, we show that the shell flux ofGloborotalia menardii, Globigerinella siphonifera, Orbulina universa, Globigerinoides sacculifer, Globigerinoides ruber (both pink and white varieties), Pulleniatina obliquiloculata, Neogloboquadrina dutertrei, Globigerinella calida and Globigerinita glutinata is characterised by lunar periodicity. However, the lunar rhythm is not present in all size fractions of each species and tends to be more dominant in the flux of larger shells, consistent with reproduction being more prevalent in larger specimens. Lunar periodicity is superimposed on longer term/seasonal changes in the shell fluxes, but accounts for a significant part of the variance in the fluxes. The amplitude of the lunar cycle increases roughly proportional with the magnitude of the flux, demonstrating that most of the population is indeed affected by lunar-phased synchronisation. In most species peak fluxes occur predominantly around, or just after, full moon. Only G. siphonifera and G. calida show a contrasting pattern with peaks concentrated around new moon. Although the exact cause of the synchronisation remains elusive, our data considerably increase the number of species for which lunar synchronised reproduction is reported and suggest that such reproductive behaviour is common in many species of planktonic foraminifera.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Lunar periodicity in the shell flux of planktonic foraminifera in the Gulf of Mexico
Series title Biogeosciences
DOI 10.5194/bg-12-3061-2015
Volume 12
Year Published 2015
Language English
Publisher Copernicus
Publisher location Katlenburg-Lindau, Germany
Contributing office(s) St. Petersburg Coastal and Marine Science Center
Description 10 p.
First page 3061
Last page 3070
Other Geospatial Gulf of Mexico
Online Only (Y/N) Y
Additional Online Files (Y/N) Y