Baseline for ostracod-based northwestern Pacific and Indo-Pacific shallow-marine paleoenvironmental reconstructions: ecological modeling of species distributions

Abstract

<p><strong>Abstract.</strong> Fossil ostracods have been widely used for Quaternary paleoenvironmental reconstructions especially in marginally marine environments (e.g. for water depth, temperature, salinity, oxygen levels, pollution). But our knowledge of the autoecology of indicator species, the base of paleoenvironmental reconstructions, remains limited and commonly lacks robust statistical support and comprehensive comparison with environmental data. We analysed marginally marine ostracod taxa at 52 sites in Hong Kong for which comprehensive environmental data are available. We applied linear regression models to reveal relationships between species distribution and environmental factors, and identified indicator species of environmental parameters. For example, <i>Sinocytheridea impressa</i> and <i>Neomonoceratina delicata</i> indicate botttom-water hypoxia – eutrophication, and heavy-metal pollution - increased turbidity, respectively. Many taxa are widespread throughout the northwestern Pacific – Indo-Pacific regions, including temperate (South China Sea to Japan and Russia), subtropical (i.e., Indo-Pacific to the East China Sea), and tropical (i.e., Indo-Pacific and South China Sea) taxa. With statistical support from ecological modeling and comprehensive environmental data, These results provide a robust baseline for ostracod-based Quaternary-Anthropocene paleoenvironmental reconstructions in the tropic–extratopic northwestern Pacific and Indo-Pacific.</p>

Benthic community history in the Changjiang (Yangtze River) mega-delta: Damming, urbanization, and environmental control

“…The high sedimentation rate in the study area suggests that ostracode valves collected in this study likely represent the fauna of the 2010s and considerable mixing with older (e.g., 1980s) ostracode valves is unlikely. Moreover, dominant species in our study such as Pistocythereis bradyformis , Bicornucythere bisanensis , Nipponocythere bicarinata , and Sinocytheridea impressa were abundantly found in muddy sediments (Fujiwara et al 2000; Irizuki et al 2006; Hong et al 2019). High abundance of these species in our samples indicates a low-energy environment and autochthonous fauna at the sites studied.…”

Early Miocene marine ostracodes from southwestern India: implications for their biogeography and the closure of the Tethyan Seaway

“…No other typical deep-water genera, such as Cytheropteron and Argilloecia , occurred in this sample, even though these genera are known to be abundant in upper bathyal depths in the Indo-Pacific region (Iwatani et al, 2018). In addition to the above-mentioned abundant genera, many other warm (often tropical) water indicator genera occurred in this sample (e.g., Cytherelloidea , Neomonoceratina , Paijenborchellina , Ruggieria , Phlyctenophora , and Stigmatocythere ) (Wood and Whatley, 1994; Yasuhara et al, 2018; Hong et al, 2019; Shin et al, 2019). Loxoconcha and Aurila are typical phytal genera, although they include sediment-dwelling species (Kamiya, 1988; Yasuhara et al, 2002b, 2005; Szczechura, 2006; Yasuhara and Seto, 2006; Reich et al, 2015).…”

Southward Migration of Arctic Ocean Species During the Last Glacial Period

“…fascis , Rabilimis mirabilis , and R . septentrionalis are considered to be circumpolar species (Cronin & Ikeya, 1987; J. Liu et al., 2018; Stepanova et al., 2003; Zhao et al., 2014); Acanthocythereis mutsuensis is considered to be a cold‐water species (Zhao & Wang, 1990); Amphileberis nipponica , Aurila cymba , Bicornucythere bisanensis , Cytheromorpha acupunctata , Cytheropteron donghaiense , Pistocythereis bradyformis , Spinileberis quadriaculeata , and Trachyleberis niitsumai are regarded as temperate species (Brandão et al., 2013; Hou & Gou, 2007; Yasuhara & Irizuki, 2001; Yasuhara & Seto, 2006); and Albileberis sinensis , Neomonoceratina delicata , Neosinocythere elongata , and Sinocytheridea impressa are treated as subtropical based on their modern distributions (Cao, 1998; Hong et al., 2017, 2019; Hou & Gou, 2007; Irizuki et al., 2009; Niiyama et al., 2019; Yajima et al., 1986; Figure S3 in Supporting Information ). The autoecologies of the dominant species are summarized in Table S4 in Supporting Information .…”