Climate-driven population size fluctuations of jellyfish (Chrysaora plocamia) off Peru

Published in Marine Biology, v. 62:2339–2350
Authors

Quiñones, J., Mianzan, H., Purca, S., Robinson, K.L., Adams, G.D. and Acha, E.M.

Publication year 2015
DOI https://dx.doi.org/10.1007/s00227-015-2751-4
Affiliations
  • Laboratorio Costero de Pisco, Instituto del Mar del Perú IMARPE, Av. Los Libertadores A-12, Urb. El Golf, Paracas, Ica, Peru
  • Instituto Nacional de Investigación y Desarrollo Pesquero INIDEP, Paseo Victoria Ocampo N°1, B7602HSA, Mar del Plata, Argentina, Instituto de Investigaciones Marinas y Costeras (UNMdP-CONICET), Mar del Plata, Argentina
  • Area de Investigaciones Marino Costeras (AFIMC), Instituto del Mar del Perú IMARPE, Esquina Gamarra y General Valle S/N Chucuito, Callao, Peru
  • Hatfield Marine Science Center, Oregon State University, Newport, OR, USA
  • Gulf Coast Research Laboratory, University of Southern Mississippi, Ocean Springs, MS, USA
  • Instituto Nacional de Investigación y Desarrollo Pesquero INIDEP, Paseo Victoria Ocampo N°1, B7602HSA, Mar del Plata, Argentina, Instituto de Investigaciones Marinas y Costeras (UNMdP-CONICET), Mar del Plata, Argentina

 

IAI Program

CRN3

IAI Project CRN3070
Keywords

Abstract

There is a general concern that jellyfish populations are increasing throughout marine ecosystems worldwide, mainly due to environmental (e.g., climate drivers) and anthropogenic forces (e.g., overfishing and eutrophication), or interactions among them. To identify drivers of jellyfish populations in the heavily fished northern Humboldt upwelling system (NHUS), we examined linkages between a 43-year-long annual time series (1972&ndash2014) of the biomass of the scyphomedusae Chrysaora plocamia and several forcing factors: the Peruvian Oscillation Index, the Regime Indicator Series and commercial landings of Peruvian anchovy. We found that C. plocamia biomass fluctuated with climate drivers, but not with anchovy landings (a proxy of fishing pressure). Jellyfish biomass was high and variable during the warm El Viejo regime in the 1970s and 1980s, with peaks connected to intra-regime El Niño Southern Oscillation (ENSO) events. By contrast, no peaks occurred during warming events in the cold La Vieja regime in the late 1990s and 2000s when jellyfish biomass was very low or below detection however, at the end of the study period, biomass rose slightly. The fishing pattern in the NHUS is just the opposite of those that previously have been attributed to removing small pelagic fish. We suggest that environmental factors and prey availability act synergistically to generate observed population size variability of this medusa in the NHUS.