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Environmental drivers of salp Thalia democratica population dynamics from in situ observations

AuthorsPascual, María; Neubert, Michael G.; Acuña Fernández, José Luis; Solow, Andrew R.; Dominguez-Carrió, Carlos CSIC ORCID; Salvador, Joaquín CSIC ; Olariaga, Alejandro CSIC; Fuentes, Veronica CSIC ORCID
KeywordsMatrix population models
Pelagic tunicate ecology
Population latency
Gelatinous zooplankton blooms
Issue DateDec-2016
PublisherInter Research
CitationMarine Ecology Progress Series 561: 189-201 (2016)
AbstractThalia democratica blooms are a recurrent phenomenon in many coastal areas of the Mediterranean Sea and have significant ecological effects. To better understand the environmental drivers of salp blooms, we conducted 8 surveys to sample T. democratica in contrasting seasonal, temperature and chlorophyll conditions. In each survey, short-term variations in the abundances of different salp stages were assessed by sampling the same population at 30 min intervals. Using these data, we estimated the parameters in a set of stage-classified matrix population models representing different assumptions about the influence of temperature and chlorophyll on each stage. In the model that best explains our observations, only females are affected by changes in water temperature. Whether this is a direct influence of temperature or an indirect effect reflecting low food availability, female reproduction cessation seems to slow population growth under unfavourable conditions. When conditions become favourable again, females liberate the embryo and change sex to male, allowing for mating under extremely low salp densities and triggering the bloom. In contrast to previous findings, our results suggest that females, rather than oozooids, are responsible for the sustainability of salp populations during latency periods
Description13 pages, 5 figures, 4 tables, supplemental material https://dx.doi.org/10.3354/meps11915
Publisher version (URL)https://dx.doi.org/10.3354/meps11915
Identifiersdoi: 10.3354/meps11915
issn: 0171-8630
e-issn: 1616-1599
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