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 vertebra-lis has a low threshold compared to several diatom-bearing and low-magnesium calcite species. In this multi-year mesocosm experiment, we tested three RPC 8.5 climate change scenarios (i) present day, (ii) the year 2050, and (iii) 2100. To enable a realistic epiphytic association, these experiments were unique-ly conducted using natural carbonate substrate, living calcifying alga, and seagrass. In contrast to pre-vious studies, we detected no reduction in surface-area growth under future climate conditions com-pared with present day conditions. In terms of calcification, M. vertebralis ' epiphytic association to pri-mary producers (i.e., calcifying algae and seagrasses) potentially ameliorates the effects of OA by buff-ering against declines in boundary layer pH during periods of photosynthesis (i. e., CO2 removal). Im-portantly for population maintenance, we observed a strong reduction in asexual fecundity under the 2100 scenario. We propose the additional energy needed to maintain growth might be one reason for drastically reduced asexual reproduction. An alternative explanation could be that the 2 ° C tempera-ture increase interfered with the environmental synchronization that triggered asexual multiple fission. We conclude that the low levels of reproduction will reduce populations in a high CO2 environment and reduce a valuable source of CaCO3 sediment production.

Claire E.Reymond;Frances Patel;Sven Uthicke

School of Earth Sciences,China University of Geosciences,Wuhan 430074,China;School of Geosciences,The University of Sydney,Sydney NSW 2006,Australia;Australian Institute of Marine Science,Townsville MC Qld 4810,Australia

地球科学学刊（英文版）

[1]Claire E.Reymond;Frances Patel;Sven Uthicke-.Stable Adult Growth but Reduced Asexual Fecundity in Marginopora vertebralis, under Global Climate Change Scenarios)[J].地球科学学刊（英文版）,2022(06):1400-1410

Asexual,Fecundity,Marginopora,vertebralis,calcifiers,Symbiodiniaceae,seagrasses,buff

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