WestgÅrd Adele, Ezat Mohamed M, Chalk Thomas B, Chierici Melissa, Foster Gavin L, Meilland Julie
CAGE-Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT, The Arctic University of Norway, Dramsveien 201, Tromso 9010, Norway.
Department of Geology, Faculty of Science, Beni-Suef University, 24V5+2GF, New Bani Suef City, New Beni Suef City, Beni Suef Governorate 2730401, Egypt.
J Plankton Res. 2023 Aug 9;45(5):732-745. doi: 10.1093/plankt/fbad034. eCollection 2023 Sep-Oct.
The planktic foraminifera is a calcifying marine protist and the dominant planktic foraminifera species in the polar oceans, making it a key species in marine polar ecosystems. The calcium carbonate shells of foraminifera are widely used in palaeoclimate studies because their chemical composition reflects the seawater conditions in which they grow. This species provides unique proxy data for past surface ocean hydrography, which can provide valuable insight to future climate scenarios. However, little is known about the response of to variable and changing environmental conditions. Here, we present observations from large-scale culturing experiments where temperature, salinity and carbonate chemistry were altered independently. We observed overall low mortality, calcification of new chambers and addition of secondary calcite crust in all our treatments. In-culture asexual reproduction events also allowed us to monitor the variable growth of 's offspring. Several specimens had extended periods of dormancy or inactivity after which they recovered. These observations suggest that can tolerate, adapt to and calcify within a wide range of environmental conditions. This has implications for the species-level response to ocean warming and acidification, for future studies aiming to culture and use in palaeoenvironmental reconstruction.
浮游有孔虫是一种钙化海洋原生生物，是极地海洋中占主导地位的浮游有孔虫物种，使其成为海洋极地生态系统中的关键物种。有孔虫的碳酸钙外壳在古气候研究中被广泛使用，因为它们的化学成分反映了它们生长的海水条件。该物种为过去的海洋表层水文状况提供了独特的代用数据，这可为未来气候情景提供有价值的见解。然而，对于其对多变和不断变化的环境条件的反应知之甚少。在这里，我们展示了大规模培养实验的观察结果，其中温度、盐度和碳酸盐化学性质被独立改变。我们在所有处理中都观察到总体死亡率较低、新房室钙化以及次生方解石壳的添加。培养中的无性繁殖事件也使我们能够监测该物种后代的可变生长情况。一些标本有较长时间的休眠或不活动期，之后它们恢复了。这些观察结果表明，该物种能够在广泛的环境条件下耐受、适应并钙化。这对该物种对海洋变暖和酸化的反应、对未来旨在培养该物种并用于古环境重建的研究具有重要意义。
