Asynchronous shifts in the demographics of two wave-swept kelp species (Laminariales) after nearly four decades

IF 2.8 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Samuel Starko, Alyssa Allchurch, Christopher Neufeld
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Abstract

Kelp forests are among the most abundant and productive marine ecosystems but are under threat from climate change and other anthropogenic stressors. Although knowledge is growing about how the abundance and distribution of kelp forests are changing, much less is known about the “non-lethal” effects that global change is having on the performance and health of kelp populations in areas where they persist. Here we assessed the age distribution of two common stipitate kelp species, Laminaria setchelli and Pterygophora californica, at Wizard Islet in Barkley Sound, British Columbia, Canada, and compared these data to historical demographic data collected by De Wreede (1984) and Klinger and DeWreede (1988) from the same site between 1981 and 1983. We observed that L. setchelli populations in 2020 were younger and less evenly aged than the same populations sampled nearly four decades prior, while the P. californica population was composed of older individuals on average than at the historical time point. Although the drivers of these demographic changes remain unclear, Barkley Sound has experienced substantial changes in the physical and biological environment over the past decade that could be responsible for these patterns. Given that the size of an individual and its probability of reproduction increases with age, shifting demographics may impact the reproductive output of each population, potentially altering the competitive relationships between co-occurring species. Changes in size distribution may also influence ecosystem-level processes such as habitat complexity or productivity.

Abstract Image

近四十年来,两种被海浪席卷的海带物种(海带)的人口结构发生了不同步的变化。
海带森林是最丰富和最具生产力的海洋生态系统之一,但受到气候变化和其他人为压力因素的威胁。尽管人们对海带森林的丰度和分布如何变化的了解越来越多,但对全球变化对海带种群持续存在的地区的性能和健康产生的“非致命性”影响知之甚少。在此,我们评估了加拿大不列颠哥伦比亚省巴克利湾Wizard island的两种常见的棘海带物种Laminaria setchelli和Pterygophora californica的年龄分布,并将这些数据与DeWreede(1984)和Klinger and DeWreede(1988)在1981 - 1983年间从同一地点收集的历史人口统计数据进行了比较。我们观察到,与近40年前取样的相同种群相比,2020年的setchelli种群更年轻,年龄更不均匀,而加利福尼亚加利福尼亚种群的平均年龄比历史时间点更大。虽然这些人口变化的驱动因素尚不清楚,但巴克利湾在过去十年中经历了物理和生物环境的重大变化,这可能是造成这些模式的原因。考虑到个体的大小及其繁殖的可能性随着年龄的增长而增加,人口结构的变化可能会影响每个种群的繁殖产出,潜在地改变共生物种之间的竞争关系。大小分布的变化也可能影响生态系统水平的过程,如生境复杂性或生产力。
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
Journal of Phycology
Journal of Phycology 生物-海洋与淡水生物学
CiteScore
6.50
自引率
3.40%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of Phycology was founded in 1965 by the Phycological Society of America. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, taxonomist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, acquaculturist, systematist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems.
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