Benthic foraminiferal patchiness – revisited

IF 4.1 3区 地球科学 Q1 PALEONTOLOGY
Joachim Schönfeld, Nicolaas Glock, Irina Polovodova Asteman, Alexandra-Sophie Roy, Marié Warren, Julia Weissenbach, Julia Wukovits
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引用次数: 0

Abstract

Abstract. Many benthic organisms show aggregated distribution patterns due to the spatial heterogeneity of niches or food availability. In particular, high-abundance patches of benthic foraminifera have been reported that extend from centimetres to metres in diameter in salt marshes or shallow waters. The dimensions of spatial variations of shelf or deep-sea foraminiferal abundances have not yet been identified. Therefore, we studied the distribution of Globobulimina turgida dwelling in the 0–3 cm surface sediment at 118 m water depth in the Alsbäck Deep, Gullmar Fjord, Sweden. Standing stock data from 58 randomly replicated samples depicted a log-normal distribution of G. turgida with weak evidence for an aggregated distribution on a decimetre scale. A model simulation with different patch sizes, outlines, and impedances yielded no significant correlation with the observed variability of G. turgida standing stocks. Instead, a perfect match with a random log-normal distribution of population densities was obtained. The data–model comparison revealed that foraminiferal populations in the Gullmar Fjord were not moulded by any underlying spatial structure beyond 10 cm diameter. Log-normal population densities also characterise data from contiguous, gridded, or random sample replicates reported in the literature. Here, a centimetre-scale heterogeneity was found and interpreted to be a result of asexual reproduction events and restricted mobility of juveniles. Standing stocks of G. turgida from the Alsbäck Deep temporal data series from 1994 to 2021 showed two distinct cohorts of samples of either high or low densities. These cohorts are considered to represent two distinct ecological settings: hypoxic and well-ventilated conditions in the Gullmar Fjord. Environmental forcing is therefore considered to impact the population structure of benthic foraminifera rather than their reproduction dynamics.
底栖有孔虫斑块-重新审视
摘要由于生态位或食物供应的空间异质性,许多底栖生物呈现聚集分布模式。特别是,据报道,在盐沼或浅水中,底栖有孔虫的高丰度斑块直径从厘米到米不等。陆架或深海有孔虫丰度的空间变化尺度尚未确定。为此,我们研究了瑞典Gullmar峡湾Alsbäck深水118 m水深0-3 cm表层沉积物中蛭形藻的分布。来自58个随机复制样本的常备种群数据描绘了一个对数正态分布,在分米尺度上的聚集分布证据不足。不同斑块大小、轮廓和阻抗的模型模拟结果显示,不同斑块大小、轮廓和阻抗的模型模拟结果与观测到的红松种群变异没有显著相关。相反,得到了与人口密度随机对数正态分布的完美匹配。数据模型对比显示,Gullmar峡湾的有孔虫种群不受任何直径超过10厘米的空间结构的影响。对数正态总体密度也是文献中报道的连续、网格化或随机样本重复数据的特征。在这里,发现了厘米尺度的异质性,并解释为无性繁殖事件和幼鱼流动性受限的结果。1994 - 2021年Alsbäck深时间数据序列的常存库呈现出高密度和低密度两组不同的样本群。这些队列被认为代表了两种不同的生态环境:Gullmar峡湾的缺氧和通风良好的条件。因此,环境强迫被认为影响底栖有孔虫的种群结构,而不是它们的繁殖动态。
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来源期刊
Journal of Micropalaeontology
Journal of Micropalaeontology 生物-古生物学
CiteScore
4.30
自引率
5.00%
发文量
7
审稿时长
>12 weeks
期刊介绍: The Journal of Micropalaeontology (JM) is an established international journal covering all aspects of microfossils and their application to both applied studies and basic research. In particular we welcome submissions relating to microfossils and their application to palaeoceanography, palaeoclimatology, palaeobiology, evolution, taxonomy, environmental change and molecular phylogeny.
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