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Stable Adult Growth but Reduced Asexual Fecundity in Marginopora vertebralis,under Global Climate Change Scenarios

Journal of Earth Science 2022年第6期33卷 1400-1410页

作者： Claire E.Reymond Frances Patel sven uthicke School of Earth Sciences China University of GeosciencesWuhan430074China School of Geosciences The University of SydneySydneyNSW2006Australia Australian Institute of Marine Science Townsville MCQld4810Australia

Large benthic foraminifera are an integral component of shallow-water tropical habitats and like many marine calcifiers,are susceptible to ocean acidification(OA)and ocean warming(OW).In particular,the prolific Symbiodiniaceae-bearing and high-magnesium calcite Marginopora vertebralis has a low threshold compared to several diatom-bearing and low-magnesium calcite *** this multi-year mesocosm experiment,we tested three RPC 8.5 climate change scenarios(i)present day,(ii)the year 2050,and(iii)*** enable a realistic epiphytic association,these experiments were uniquely conducted using natural carbonate substrate,living calcifying alga,and *** contrast to previous studies,we detected no reduction in surface-area growth under future climate conditions compared with present day *** terms of calcification,***’epiphytic association to primary producers(i.e.,calcifying algae and seagrasses)potentially ameliorates the effects of OA by buffering against declines in boundary layer pH during periods of photosynthesis(i.e.,CO_(2)removal).Importantly for population maintenance,we observed a strong reduction in asexual fecundity under the 2100 *** propose the additional energy needed to maintain growth might be one reason for drastically reduced asexual *** alternative explanation could be that the 2℃temperature increase interfered with the environmental synchronization that triggered asexual multiple *** conclude that the low levels of reproduction will reduce populations in a high CO_(2)environment and reduce a valuable source of CaCO_(3) sediment production.

关键词： mesocosm experiment ocean acidification ocean warming large benthic foraminifera carbonate production tropical reef asexual reproduction climate change

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