Biome classification from Japanese pollen data: application to modern-day and Late Quaternary samples

Gotanda, Katsuya; Nakagawa, Takeshi; Tarasov, Pavel E.; Kitagawa, Junko; Inoue, Yasushi; Yasuda, Yoshinori

doi:10.1016/s0277-3791(01)00046-4

Cited by 85 publications

(29 citation statements)

References 13 publications

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“…The quantitative vegetation reconstruction uses the biomization method (20). Thirty-two major AP taxa were used for the reconstruction, with percentages recalculated using the sum of the 32 AP taxa.…”

Section: Methodsmentioning

confidence: 99%

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Midlatitude cooling caused by geomagnetic field minimum during polarity reversal

Kitaba

Hyodo

Katoh

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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The climatic effects of cloud formation induced by galactic cosmic rays (CRs) has recently become a topic of much discussion. The CRcloud connection suggests that variations in geomagnetic field intensity could change climate through modulation of CR flux. This hypothesis, however, is not well-tested using robust geological evidence. Here we present paleoclimate and paleoenvironment records of five interglacial periods that include two geomagnetic polarity reversals. Marine oxygen isotope stages 19 and 31 contain both anomalous cooling intervals during the sea-level highstands and the Matuyama-Brunhes and Lower Jaramillo reversals, respectively. This contrasts strongly with the typical interglacial climate that has the temperature maximum at the sea-level peak. The cooling occurred when the field intensity dropped to <40% of its present value, for which we estimate >40% increase in CR flux. The climate warmed rapidly when field intensity recovered. We suggest that geomagnetic field intensity can influence global climate through the modulation of CR flux.ne of the main goals of paleoclimatology is to reveal factors that control the Earth's climate. Besides widely accepted climate drivers such as insolation and air-ocean circulation, the effect of clouds induced by galactic cosmic rays (CRs) has recently become a topic of much interest (e.g., 1, 2). Changes in CR flux may affect cloud cover (3, 4) through charge-related processes such as ion-induced nucleation (5) or its effect on the global electric circuit (6), which in turn affect cloud microphysics and formation/radiation of clouds. This would affect the global heat balance by increasing/decreasing albedo (7). Recent observations and modeling support the link between cloud cover and global temperature on decadal time scales (8). A cooling effect caused by the CR-induced clouds was also observed during the Southern Hemisphere Magnetic Anomaly (9), although the interval of observation was too short to be solid confirmation. Longer-term evidence is needed to confirm the CR flux-climate coupling.An alternative way of testing the CR flux-climate coupling is to examine climate across a huge CR flux change in geological history. The geomagnetic field is a major factor controlling CR flux over longer time scales (10), and geomagnetic reversals are always accompanied by large decreases in field strength, which cause a large increase in CR flux. The Matuyama-Brunhes (MB) and Lower Jaramillo (LJ) geomagnetic polarity reversals provide suitable opportunities for such a test. During these reversals, the field intensity decreased to 10-20% of its present value for several thousand years (11). Additionally, the MB and LJ reversals occurred during interglacial periods, times when the impact of increased cloud cover on climate should be more readily detectable than in glacial periods. In this study, we compare detailed (ca. 200-to 2,000-y resolution) multiproxy climate analyses of five interglacial periods to see whether those with a geomagnetic reversal have unique features, ...

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Section: Methodsmentioning

confidence: 99%

“…This cool interval is also seen in an objective vegetation reconstruction (Methods and ref. 20), where the temperate deciduous forest (TEDE) biome replaced the broad-leaved evergreen warm-mixed forest (WAMX) (Fig. 3D).…”

mentioning

confidence: 99%

Midlatitude cooling caused by geomagnetic field minimum during polarity reversal

Kitaba

Hyodo

Katoh

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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“…So the studies of modern pollen have received more attention in China and other countries. The study objects involve the relationship of pollen and vegetation (Kari, 1999;Zhong, 2001;Li, 2000), the representation of pollen (Pardoe, 2001), classification of flora using pollen data (Katsuya, 2002;Caroline, 2001), the impact of human action inferred from relationship between pollen and vegetation (Kari, 1997;Wang, 1996) and the reconstruction of paleoenvironment and paleoclimate (Wang, 1996;Davis et al, 2003). The study regions cover woodlands, woodland-steppe ecotones, woodland-steppe-desert ecotones, prairies, meadows, deserts and marshes.…”

Section: Introductionmentioning

confidence: 99%

Surface pollen in the east of Qaidam Basin

et al. 2006

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Pollen analysis of 23 surface samples in the east of Qaidam Basin reveals the characteristics of pollen assemblages and their relationships with vegetation and climate. In pollen assemblages, Chenopodiaceae and Artemisia are preponderant types in all the samples, and Ephedra, Gramineae and Compositae are common types. The results of DCA (Detrended Correspondance Analysis) and Correlation Analysis show different pollen assemblages indicate different vegetations, coincided with respective vegetation types. A/C (Artemisia/Chenopodiaceae) in the desert can indicate the aridity.Depending on the aridity, the vegetation communities are divided into four groups: severe drought group, moderate drought group, slight drought group and tropophilous group. A/C value is less 0.2 in the severe drought group, 0.2-0.5 in the moderate drought group, 1.63 in the slight drought group and 5.72 slight-wetness group.

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“…Although geological events presented opportunities for isolation and evolutionary diversiÞcation, climatic change provided an opportunity for large-scale geographical range shifts of many plants and animals. Fossil evidence suggests that long-distance dispersal occurred between Japan and mainland Asia during glacial periods (Miyoshi et al 1999, Gotanda et al 2002, Chung 2006, Ogino and Otsuka 2008, and biogeographic patterns in northeastern Asia suggest that climate change, as opposed to isolating events, played a prominent role in the evolutionary history of species and the formation of biological communities (Millien-Parra and Jaeger 1999, Pietsch et al 2003).…”

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confidence: 98%

Phylogenetic Relationships and Relictualism of Rock-Crawlers (Grylloblattodea: Grylloblattidae) in Cave and Mountain Habitats of Korea

Schoville¹,

Kim²

2011

Annals of the Entomological Society of America

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Rock-crawlers (Grylloblattodea: Grylloblattidae) in northeastern Asia are low-vagility insects that are restricted to cool temperate forests and mountainous regions. Morphologically distinguishable species are similar ecologically and show narrow endemism and a patchy distribution. As a result, grylloblattids are hypothesized to be relict species that have persisted in situ over long periods of climatic and geological change (Storozhenko and Oliger 1984). We investigate whether the diversification pattern of Asian grylloblattids reflects long-term persistence and divergence due to geological events, or more recent diversification in response to climatic change. Using multilocus genetic data, we examine the phylogenetic relationship to other Asian Grylloblattidae and the geographic pattern of diversification of Korean rock-crawlers, Galloisiana Caudell & King (1924) and Namkungia Storozhenko & Park (2002). Our analysis reveals a monophyletic grouping of Korean species, with multiple cryptic lineages and restricted geographical distributions. Based on genetic data, Korean species are closely related to Japanese Galloisiana. Using a Bayesian relaxed clock model calibrated with a mitochondrial substitution rate, the age of the most recent common ancestor of the Korean—Japanese lineage is estimated within the Miocene epoch. This provides evidence for a diversification event closely tied to the geological events separating the Japanese archipelago from the Korean peninsula.

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Biome classification from Japanese pollen data: application to modern-day and Late Quaternary samples

Cited by 85 publications

References 13 publications

Midlatitude cooling caused by geomagnetic field minimum during polarity reversal

Midlatitude cooling caused by geomagnetic field minimum during polarity reversal

Surface pollen in the east of Qaidam Basin

Phylogenetic Relationships and Relictualism of Rock-Crawlers (Grylloblattodea: Grylloblattidae) in Cave and Mountain Habitats of Korea

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