División de Estudios de Posgrado, Universidad del Mar (UMAR), Campus Puerto Ángel, Distrito de San Pedro Pochutla, Puerto Ángel, Oaxaca, Mexico, C.P. 70902.
Instituto de Recursos, Universidad del Mar (UMAR), Campus Puerto Ángel, Distrito de San Pedro Pochutla, Puerto Ángel, Oaxaca, Mexico, C.P. 70902.
J Therm Biol. 2019 Jul;83:157-164. doi: 10.1016/j.jtherbio.2019.05.011. Epub 2019 May 22.
Toxopneustes roseus performs a key role in the eastern tropical Pacific as a strategic herbivore and bioturbation promoter. We evaluated the effect of temperature on the fertilization success, embryonic development and larval survival of T. roseus under laboratory conditions, to understand how the increase in ocean temperature could affect it in a global warming. The highest percentage of fertilization occurred in gametes that were exposed to 30 °C, and a significant negative effect of 32 °C was evidenced by the lowest percentage. There was also a deleterious effect in embryos exposed to 32 °C, resulting in an abnormal development at all the time points. The highest percentage of larval survival occurred at 30 °C, while the lowest percentage occurred at 32 °C. The results suggest that T. roseus probably lives near its upper thermal limit, and future ocean warming could threaten the permanence of the species in the eastern tropical Pacific, or at least lead to contraction or fragmentation of its range limits. Therefore if sea temperature rises globally, it could cause the disappearance of these populations that are living at the edge of their thermal tolerance, but for other populations located in more temperate latitudes, it could propitiate favorable conditions for fertilization and survival of embryos and larvae.
玫瑰毒鲉在东热带太平洋中扮演着重要的角色，既是一种关键的草食性动物，也是生物扰动的促进者。我们评估了温度对玫瑰毒鲉在实验室条件下受精成功、胚胎发育和幼虫存活的影响，以了解海洋温度升高如何影响它在全球变暖中的表现。在 30°C 下暴露的配子的受精率最高，而在 32°C 下暴露的配子的受精率最低，这表明 32°C 对受精有显著的负面影响。在 32°C 下暴露的胚胎也受到了有害影响，导致在所有时间点都出现了异常发育。幼虫的存活率在 30°C 时最高，而在 32°C 时最低。研究结果表明，玫瑰毒鲉可能生活在其热限的上限附近，未来的海洋变暖可能会威胁到该物种在东热带太平洋的永久性，或者至少会导致其分布范围的收缩或碎片化。因此，如果全球海温上升，可能会导致这些生活在热耐受边缘的种群消失，但对于其他位于较温带纬度的种群，可能会为胚胎和幼虫的受精和存活提供有利条件。
