Abstract
With ocean warming predicted globally, one of the mechanisms driving distributional shifts and changes in the abundance of resident fishes is reproductive output. The relationship between sea surface temperature and the reproductive activity of a eurythermic, resident coastal species, blacktail seabream Diplodus sargus capensis, was examined in the “ocean warming” hotspot of the northern Benguela. Reproductive activity was found to be restricted to periods when the water temperature dropped below 20 °C. A metadata analysis conducted on the D. sargus sub-species complex similarly showed that reproductive activity was restricted to temperatures between 15 and 20 °C, regardless of the range in ambient water temperature. Based on these findings and using satellite derived SST information, we examined D. s. capensis’s total and seasonal “reproductive scope” that is defined as either the area suitable for spawning each year or the duration of its potential spawning season at a fixed geographical locality, respectively. Trends were examined over the last three decades. Reproductive scope by area was found to be shrinking at a rate of 7 % per decade in southern Angola and expanding at a rate of 6 % per decade in northern Namibia. Reproductive scope by season decreased by 1.05 months per decade in Namibe, southern Angola and increased by 0.76 months per decade in Hentiesbaai, northern Namibia. Changes in reproductive scope may be a driving mechanism of distributional shifts in resident fishes, although the rate of the shifts is likely to be slow. More importantly, changes in reproductive scope will not be uniform throughout fish distributions and will most likely result in heterogeneous variations in fish abundance.
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Acknowledgments
This material is based upon work supported by the National Research Foundation (NRF) under grant number 66957. Rico Sakko is thanked for the use of the facilities at Flamingo Lodge, Angola. Barry Wareham (Basil Manning Active Fishing Gear) is thanked for the fishing tackle sponsorship. TJR received financial support from Rhodes University, the Ernst and Ethel Eriksen Trust and the NRF. Amber Childs is thanked for her assistance with the map. These data were provided by the Group for High Resolution Sea Surface Temperature (GHRSST) and the US National Oceanographic Data Center. This project was supported in part by a grant from the NOAA Climate Data Record (CDR) Program for satellites. Two anonymous reviewers are thanked for their comments on an earlier version of this manuscript.
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Potts, W.M., Booth, A.J., Richardson, T.J. et al. Ocean warming affects the distribution and abundance of resident fishes by changing their reproductive scope. Rev Fish Biol Fisheries 24, 493–504 (2014). https://doi.org/10.1007/s11160-013-9329-3
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DOI: https://doi.org/10.1007/s11160-013-9329-3