Ocean Regime Shift is Driving Collapse of the North Atlantic Right Whale Population

IF 3.2 4区地球科学 Q1 OCEANOGRAPHY

Oceanography Pub Date : 2021-09-01 DOI:10.5670/OCEANOG.2021.308

E. Meyer‐Gutbrod, C. Greene, K. Davies, D. Johns

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引用次数: 41

Abstract

C. FINMARCHICUS ABUNDANCE Figure S1 shows the time series of the annual C. finmarchicus Abundance Index for the Gulf of Maine. It should be noted that NOAA funding cuts resulted in the Gulf of Maine Continuous Plankton Recorder (CPR) survey being discontinued in 2017. In addition, the survey route was changed in 2009, shifting its departure port from Boston, Massachusetts, to Portland, Maine. Therefore, coverage of Massachusetts Bay was discontinued, and coverage of the western Gulf of Maine was markedly different after 2009. Coverages of the eastern Gulf of Maine and western Scotian Shelf remained comparable. Results from a spatially and temporally resolved right whale reproduction model (Meyer-Gutbrod et al., 2015) demonstrated that when the summertime (third quarter–July, August, September) C. finmarchicus Abundance Index in the eastern Gulf of Maine falls below a certain threshold value, prenatal or neonatal calf mortality is triggered, presumably due to inadequate prey availability and poor maternal nutrition. This threshold value is shown in Figure S2, the time series of the summertime C. finmarchicus Abundance Index in the eastern Gulf of Maine. Due to the previously mentioned limitations in the availability of CPR survey data in the western Gulf of Maine during recent years, this threshold value could only be estimated, with the model using data through 2009. Because of this constraint, it was decided to show the threshold value in Figure S2 rather than in Figure 2c.

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海洋格局的转变导致北大西洋露脊鲸种群的崩溃

C.FINMARCHICUS丰度图S1显示了缅因湾年度C.finmarchi丰度指数的时间序列。需要注意的是，美国国家海洋和大气管理局的资金削减导致缅因湾连续浮游生物记录器（CPR）调查于2017年停止。此外，调查路线在2009年发生了变化，将出发港从马萨诸塞州波士顿转移到缅因州波特兰。因此，马萨诸塞湾的覆盖范围停止了，缅因湾西部的覆盖范围在2009年后明显不同。缅因湾东部和斯科细亚大陆架西部的覆盖率仍然相当。空间和时间分辨露脊鲸繁殖模型的结果（Meyer Gutbrod et al.，2015）表明，当缅因湾东部的夏季（第三季度——7月、8月、9月）C.finmarchicus丰度指数降至某个阈值以下时，就会触发产前或新生儿幼崽死亡率，可能是由于猎物供应不足和母体营养不良。该阈值如图S2所示，这是缅因湾东部夏季C.finmarchicus丰度指数的时间序列。由于近年来缅因湾西部CPR调查数据的可用性存在上述限制，该阈值只能通过使用截至2009年的数据进行估计。由于这个限制，决定在图S2中显示阈值，而不是在图2c中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oceanography 地学-海洋学

CiteScore

6.10

自引率

3.60%

发文量

审稿时长

6-12 weeks

期刊介绍： First published in July 1988, Oceanography is the official magazine of The Oceanography Society. It contains peer-reviewed articles that chronicle all aspects of ocean science and its applications. In addition, Oceanography solicits and publishes news and information, meeting reports, hands-on laboratory exercises, career profiles, book reviews, and shorter, editor-reviewed articles that address public policy and education and how they are affected by science and technology. We encourage submission of short papers to the Breaking Waves section that describe novel approaches to multidisciplinary problems in ocean science.