Global and Planetary Change最新文献

{"title":"Weak enhancement of carbon fixation in the Northern Hemisphere terrestrial ecosystems by aerosol emissions during 1980–2014 with the Community Earth System Model","authors":"Haiwei Zhang ,&nbsp;Jia Song ,&nbsp;Aiguo Zhang ,&nbsp;Longhui Li","doi":"10.1016/j.gloplacha.2025.104827","DOIUrl":"10.1016/j.gloplacha.2025.104827","url":null,"abstract":"<div><div>The effects of aerosols on carbon sequestration in sunlit and shaded leaves of vegetation cover are well understood; however, it is difficult to quantify these effects on gross primary productivity (GPP) with existing observational data. In this study, the Community Earth System Model (CESM) is used to quantify the effects of aerosol emissions on the GPP of sunlit and shaded leaves in Northern Hemisphere terrestrial ecosystems from 1980 to 2014. The results revealed that aerosol emissions caused an increase of approximately 2.96 Pg C (approximately 4.8 %) in the cumulative GPP in the Northern Hemisphere. Carbon fixation from sunlit leaves (C.sun) contributed to a net increase of 3.33 Pg C, while carbon fixation from shaded leaves (C.sha) led to a net decrease of 0.37 Pg C from 1980 to 2014. The influence of aerosol emission changes on terrestrial GPP exhibited significant spatial heterogeneity after the 1980s, as carbon fixation from shaded leaves (25.8 %) contributed to an increase in GPP, whereas carbon fixation from sunlit leaves (38.6 %) led to a decrease in GPP. In addition, aerosol-induced vapour pressure deficit (VPD) dominated the changes in Northern Hemisphere GPP (42.5 %), while soil moisture (SM) and diffuse photosynthetically active radiation (PAR_dif) were the most important climatic factors, accounting for approximately 33 % and 25.5 %, respectively. Our results indicate that the effects of VPD on GPP should be adequately considered when assessing ecosystem responses to future climate conditions.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104827"},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ENSO exacerbated the impact of compound dry–hot events on maize yield over China during 1961–2020","authors":"Xinying Wu ,&nbsp;Dabang Jiang ,&nbsp;Yang Yang","doi":"10.1016/j.gloplacha.2025.104828","DOIUrl":"10.1016/j.gloplacha.2025.104828","url":null,"abstract":"<div><div>Increasing compound dry and hot events (CDHEs) have become a leading risk to regional and global crop production. While numerous accounts of crop growth or yield response to climate extremes exist, impacts of CDHEs on crop yield are not well quantified, especially for that associated with large-scale modes of climate variabilities. Here we address this issue by using statistical maize yield data over China with a special focus on the impact of El Niño–Southern Oscillation (ENSO). We find that over 1961–2020, CDHEs led to significant yield reduction by 4 %, while it was aggravated to 6 % by the concurrent ENSO. Mechanisms for this underscored the role of ENSO in modulating CDHE characteristics wherein land–atmosphere feedbacks significantly contributed to yield loss. Compared to early stage of growth, ENSO in conjunction with compound events triggered more substantial maize yield losses during the late stage. Furthermore, this amplified risk was observed to intensify in recent decades. Note that agronomic practices, like irrigation, could significantly offset these negative impacts on maize yield. These findings highlight the great threat of CDHEs to maize yield as well as the key role of ENSO in driving this process, and may offer insights for yield prediction and agricultural management.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104828"},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Divergent vegetation greening's direct impacts on land-atmosphere water and carbon exchanges in the northeastern Tibetan Plateau","authors":"Yiwen Luo ,&nbsp;Ning Ma ,&nbsp;Yongqiang Zhang","doi":"10.1016/j.gloplacha.2025.104825","DOIUrl":"10.1016/j.gloplacha.2025.104825","url":null,"abstract":"<div><div>Changes in vegetation have pronounced effects on water and carbon cycles. In the past few decades with significant warming, vegetation in the Tibetan Plateau (TP) has become overall greening, particularly in its northeastern part. However, the effects of these changes on land-atmosphere water and carbon exchanges in the TP remain insufficiently understood. Here, we use a water‑carbon coupled model, Penman-Monteith-Leuning Version 2, to quantify the direct impacts of vegetation change on evapotranspiration (<em>ET</em>) and gross primary production (<em>GPP</em>) in the Yellow River Source (YRS) region, a greening hotspot in the northeastern TP. We show that <em>ET</em> and <em>GPP</em> in the YRS increased significantly from 1982 to 2018, with trends of 1.72 ± 0.21 mm yr⁻² and 3.96 ± 0.55 gC m⁻² yr⁻² (both <em>p</em> &lt; 0.001), respectively. The change in leaf area index (LAI) was the dominant driver of <em>GPP</em>'s increase, contributing 79 %, followed by atmospheric CO₂ concentration and the climatic factors. However, vegetation greening had a limited impact (11 %) on <em>ET</em> since the increases in plant transpiration (<em>E</em>_<em>c</em>) and canopy evaporation (<em>E</em>_<em>i</em>) were largely offset by the decline in soil evaporation (<em>E</em>_<em>s</em>). Instead, the climatic factors contributed most (72 %) to <em>ET</em> change over the past 37 years. Nevertheless, vegetation changes played a key role in altering <em>ET</em> components, with LAI contributing nearly 40 % to trends in <em>E</em>_<em>s</em> and <em>E</em>_<em>c</em>, and over 70 % to the <em>E</em>_<em>i</em> trend over the past 37 years. Our results highlight the distinct roles that vegetation plays in regulating land-atmosphere water and carbon exchanges at high altitudes.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104825"},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Refining paleoelevation estimates of the European Alps by simulating Middle Miocene climate and δ18O responses to diachronous surface uplift scenarios","authors":"Daniel Boateng ,&nbsp;Sebastian G. Mutz ,&nbsp;Katharina Methner ,&nbsp;Armelle Ballian ,&nbsp;Maud J.M. Meijers ,&nbsp;Andreas Mulch ,&nbsp;Todd A. Ehlers","doi":"10.1016/j.gloplacha.2025.104808","DOIUrl":"10.1016/j.gloplacha.2025.104808","url":null,"abstract":"<div><div>Estimates of past surface elevations are essential for understanding the evolution of the Earth's physiography and biodiversity distribution. Stable isotope paleoaltimetry is widely used to infer paleoelevation due to a robust systematic inverse relationship between elevation and isotopic composition (<span><math><msup><mi>δ</mi><mn>18</mn></msup><mi>O</mi></math></span>, <span><math><mi>δD</mi></math></span>) of meteoric waters (i.e., isotopic lapse rate). The difference in <span><math><msup><mi>δ</mi><mn>18</mn></msup><mi>O</mi></math></span> of paleo-meteoric water reconstructed from coeval proxy materials between adjacent low- and high-elevation sites (<span><math><mi>Δ</mi><msup><mi>δ</mi><mn>18</mn></msup><msub><mi>O</mi><mi>p</mi></msub></math></span>) is transformed into paleoelevation changes using such isotopic lapse rates (<span><math><mi>δ</mi></math></span>-<span><math><mi>δ</mi></math></span> approach). Most often, the isotopic lapse rate is assumed to be stationary through time and space and, therefore, relies on modern estimates to constrain paleoelevation changes. This study employs model-based sensitivity analysis to assess the spatio-temporal variability of the isotopic lapse rate of the European Alps and to quantify the magnitude of uncertainties in paleoelevation estimates associated with the use of modern isotopic lapse rates. We use the high-resolution isotope-tracking climate model to simulate the <span><math><msup><mi>δ</mi><mn>18</mn></msup><mi>O</mi></math></span> in precipitation (<span><math><msup><mi>δ</mi><mn>18</mn></msup><msub><mi>O</mi><mi>p</mi></msub></math></span>) response to Middle Miocene conditions (e.g., atmospheric CO2, palaeogeography) and diachronous west-to-east surface uplift propagating along the Alpine orogen. The simulated isotopic lapse rates become shallower by <span><math><mo>∼</mo></math></span>1.0 ‰ km⁻¹ in response to Middle Miocene conditions compared to the Pre-Industrial period and vary within the range of <span><math><mo>±</mo></math></span>1.5 ‰ km⁻¹ for the diachronous surface uplift scenarios of the Alps. Applying the simulated isotopic lapse rates to Miocene <span><math><mi>Δ</mi><msup><mi>δ</mi><mn>18</mn></msup><msub><mi>O</mi><mi>p</mi></msub></math></span> proxy reconstructions suggests an overestimation of Central Alps paleoelevation by <span><math><mo>∼</mo></math></span>1.5 km when using modern rainfall-based isotopic lapse rate across the Alps. However, the simulated Miocene isotopic lapse rates estimate aligns more closely with modern global river-based lapse rates, suggesting they are more suitable than rainfall-based estimates when a paleoclimate-constrained isotopic lapse rate is unavailable.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104808"},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The silicon isotopes of Permian biogenic cherts from the South China unveils marine silicon cycle response to the termination process of late Paleozoic ice age","authors":"Su Li ,&nbsp;Xu Yao ,&nbsp;Yaoqi Zhou ,&nbsp;Junsheng Nie","doi":"10.1016/j.gloplacha.2025.104821","DOIUrl":"10.1016/j.gloplacha.2025.104821","url":null,"abstract":"<div><div>There is a global chert accumulation event during the Permian period - Permian Chert Event (PCE, ∼280 Ma to 251 Ma), indicating large perturbations in the marine silicon cycle. The Permian also witnessed termination of Earth's penultimate icehouse (late Paleozoic ice age - LPIA, ∼340 Ma to ∼260 Ma), final assembly of the Pangea supercontinent and significant changes in biosphere. However, few studies have been focused on using these PCE cherts to understand the marine silicon cycle during this major environmental and climatic transition period. Here, we study the petrology, mineralogy and geochemistry of widespread cherts formed during the PCE period on the northeastern margin of the South China, which was located near the equator in the eastern Paleo-Tethys Ocean and isolated from the assembling Pangea supercontinent. Our studied period of the cherts is from ∼280 to ∼253 Ma and overlaps with the demise of LPIA. The petrologic, mineralogical and geochemical (silicon isotopes, oxygen isotopes, major and trace elements) results support that these studied Permian cherts are biogenic in origin. New and compiled silicon isotope data of biogenic cherts from South China generally show lowest δ³⁰Si values (−0.4 ‰ to 1.6 ‰, with an average of 0.5 ‰) during the coldest stage from 273 to 262 Ma in the middle Permian, highest δ³⁰Si values (0.4 ‰ to 2.5 ‰, with an average of 1.4 ‰) during the warm stage from ∼280 to 273 Ma of the early Permian and intermediate δ³⁰Si values (0.1 ‰ to 1.8 ‰, with an average of 0.9 ‰) during the warmest stage from ∼262 to 252 Ma in the late Permian. Comparing our results with previous records of tectonics, volcanic, marine lithium and strontium isotopes, we demonstrate the major controlling role of marine siliceous productivity on the silicon isotopes of these biogenic cherts. Our results of generally higher δ³⁰Si values in warm periods in contrast with lower values in cold periods indicate decreased oceanic dissolved silicon concentration and enhanced marine siliceous productivity in warming oceans, probably due to more nutrients supplied by enhanced costal upwelling during warm non-glacial periods. However, the silicon isotopes of the late Permian cherts from ∼262 to 252 Ma are probably also affected by continental weathering inputs. Our study provides a typical example of interpreting changes of silicon isotopes in biogenic cherts through major climatic transition period in terms of changes of oceanic siliceous biological productivity and provide insights into Permian marine silicon cycle during the termination process of late Paleozoic ice age.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104821"},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decadal causes of the Wanli megadrought in northern China during the Ming Dynasty: Perspectives from the Pacific Ocean","authors":"Xuanchen Li ,&nbsp;Xiangyu Li ,&nbsp;Yong Liu ,&nbsp;Bo Sun ,&nbsp;Gebanruo Chen","doi":"10.1016/j.gloplacha.2025.104824","DOIUrl":"10.1016/j.gloplacha.2025.104824","url":null,"abstract":"<div><div>Climate change has profound implications for the social stability and societal crisis. The prominent Wanli megadrought (1585–1590 CE) had a profound impact on northern China and might contribute to the collapse of the Ming Dynasty. Despite its historical significance, the underlying mechanisms of the Wanli megadrought remain unclear. This study combines reconstruction and CESM Last Millennium Ensemble (CESM-LME) simulation to investigate the decadal-scale evolution of the Wanli megadrought. The reconstructed summer precipitation over much of northern China reveals a decadal Wanli megadrought period during 1581 and 1592 CE. The simulation reasonably reproduces the Wanli megadrought and associated climate fluctuations preceding and succeeding it on a decadal timescale. During the Wanli megadrought, simulated summer precipitation decreased from the Yangtze River to northern China, accompanied by anomalous air subsidence and anomalous cyclones over Northeast Asia and the subtropical western North Pacific. These circulation anomalies during the Wanli megadrought were mainly driven by warming around the Maritime Continent and cooling over the rest tropical Pacific on a decadal timescale, as evidenced by proxy data and simulation. These sea surface temperature (SST) changes caused the weakening of the East Asian summer monsoon through their influences on Walker circulation and inducing the decadal Pacific–Japan-like Rossby wave train propagated northward. Additionally, the phase shift of the PDO-like SST pattern may also contribute to the Wanli megadrought, aligning with several reconstructions, though more SST evidence is needed. Perspectives from the Pacific SST variability would enhance our understanding of the Wanli megadrought on a decadal timescale.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104824"},"PeriodicalIF":4.0,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chemical weathering and its control mechanism in the Yarlung Zangbo drainage basin on the Tibetan Plateau","authors":"Mingyang Yu,&nbsp;Zhifei Liu,&nbsp;Yulong Zhao,&nbsp;Baozhi Lin","doi":"10.1016/j.gloplacha.2025.104819","DOIUrl":"10.1016/j.gloplacha.2025.104819","url":null,"abstract":"<div><div>Silicate weathering acts as a negative feedback that regulates the Earth's long-term climate by removing CO₂ from the atmosphere. However, maintaining a close balance in the global carbon cycle requires a timely response of weathering to the changing climate. Here, we investigate major and trace element contents of both silt (&lt;63 μm) and clay (&lt;2 μm) fractions of surface sediments collected at high spatial resolution along the course of the Yarlung Zangbo river system on the Tibetan Plateau to study the sensitivity of silicate weathering intensity to climate. We isolate the true weathering signals by defining the δα^AlE indices and δCIA to quantify the elemental fractionation between the clay and silt fractions. The results show increasing trends in δα^AlCa, δα^AlNa, δα^AlSr, δα^AlMg, and δCIA and a decreasing trend in δα^AlLi downstream (eastward) along the 1700-m-long river course of the Yarlung Zangbo. These findings reveal an increase in silicate weathering intensity in response to increasing temperature and precipitation from the interior to the eastern edge of the Tibetan Plateau. Combined with correlation analysis, we further infer that temperature is the primary controlling factor of silicate weathering intensity on the Tibetan Plateau, whereas precipitation plays a secondary role. Our study shows that silicate weathering intensity can respond sensitively to temperature changes in a low-temperature environment (∼0–10 °C) on the Tibetan Plateau at the present-day timescale. This highlights the potential of the Tibetan Plateau to buffer against the ongoing warming climate by enhancing chemical weathering.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104819"},"PeriodicalIF":4.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cadmium isotopic evidence for the redistribution and fate of cadmium during carbonate weathering","authors":"Yizhang Liu ,&nbsp;Jing Jing ,&nbsp;Yongxiang Zhang ,&nbsp;Chuanwei Zhu ,&nbsp;Ting Gao ,&nbsp;Zengping Ning ,&nbsp;Jing Sun ,&nbsp;Tangfu Xiao ,&nbsp;Chengshuai Liu","doi":"10.1016/j.gloplacha.2025.104820","DOIUrl":"10.1016/j.gloplacha.2025.104820","url":null,"abstract":"<div><div>The weathering of carbonate rocks releases considerable amounts of cadmium (Cd) thus posing potential risks to the ecosystem and human health. The biogeochemical cycling of Cd during weathering processes is poorly understood because of the absence of efficient tracers for Cd biogeochemical processes. In this study, the Cd isotope technique was applied to elucidate the redistribution and fate of Cd during carbonate weathering. The results showed that the weathering of Cd-rich limestone resulted in elevated Cd contents in soils (2.63–22.7 mg/kg) and plants (0.20–1.16 mg/kg). The chemical fractions of Cd in the overlying soils were dominated by Fe and Mn oxides, and organically-bound Cd increased with increasing organic matter content. The heavier Cd isotopic composition of bedrock (δ^114/110Cd: 0.38 ‰) than that of soil (0.23 ‰) demonstrated the loss of Cd during carbonate weathering. Minor isotope fractionation (∆^114/110Cd &lt; 0.20 ‰) observed in the paddy soil profiles coincides with the limited migration and redistribution of Cd during the development of paddy soil. Additionally, the retention of Cd from weathering fluid by Fe/Mn oxides and organic matter contributes to the enrichment of heavy Cd isotopes in soils. Furthermore, the positive correlation between δ^114/110Cd values and soil organic matter contents indicates the addition of Cd from the litter (δ^114/110Cd: 0.30–0.94 ‰). These results shed light on the response of Cd isotope signals to biogeochemical processes and the cycling of Cd during weathering processes.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104820"},"PeriodicalIF":4.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"No extinction in foraminifera during the Carnian Pluvial Episode (Late Triassic)","authors":"Zhe Li ,&nbsp;Xin Yang ,&nbsp;Jacopo Dal Corso ,&nbsp;Fengyu Wang ,&nbsp;Enhao Jia ,&nbsp;Xu Dai ,&nbsp;Zhiwei Yuan ,&nbsp;Xiangmin Chen ,&nbsp;Jiankang Lai ,&nbsp;Xing Li ,&nbsp;Xiaokang Liu ,&nbsp;Shouyi Jiang ,&nbsp;Bingjia Wang ,&nbsp;Kui Wu ,&nbsp;Daoliang Chu ,&nbsp;Huyue Song ,&nbsp;Li Tian ,&nbsp;Haijun Song","doi":"10.1016/j.gloplacha.2025.104817","DOIUrl":"10.1016/j.gloplacha.2025.104817","url":null,"abstract":"<div><div>The Carnian Pluvial Episode (CPE, Late Triassic, ∼234–232 Ma) was a major climate change characterized by intensified hydrological cycle, perturbations in the carbon cycle, global warming and ocean anoxia. The climate perturbation was coeval to significant biological changes, including extinctions and the emergence of new clades. Research on the climatic changes of the CPE has been conducted extensively across the Tethys domain. However, the high-resolution fossil investigation is very limited, limiting our understanding of the relationship between the CPE and biological changes. Here, we analyzed foraminiferal assemblages, their diversity and abundance in Erguan section of Guizhou (Paleotethys) and Quxia section of South Tibet (Neotethys). The results indicate that, although the global climate and marine environment changed dramatically during the CPE with a transient local impact on the communities, no significant extinctions are recorded among foraminifera in these regions. Foraminifera in Erguan section responded to the CPE mainly with a sharp decrease in diversity and abundance at the beginning of the episode, while in Quxia section they did not show obvious responses. The different biotic responses of foraminifera may reflect variable environmental conditions, such as varying degrees of warming, siliciclastic input and ocean anoxia in the two regions. Our results show that different marine organisms responded differently to the CPE, highlighting the complexity of the impact of Carnian climatic changes on living organisms.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104817"},"PeriodicalIF":4.0,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variation of population and community ecology over large spatial scales in Ediacaran early animal communities","authors":"Emily G. Mitchell ,&nbsp;Nile P. Stephenson ,&nbsp;Princess A. Buma-at ,&nbsp;Lucy Roberts ,&nbsp;Sasha Dennis ,&nbsp;Charlotte G. Kenchington","doi":"10.1016/j.gloplacha.2025.104818","DOIUrl":"10.1016/j.gloplacha.2025.104818","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The Ediacaran strata of Newfoundland, Canada (580–560 Ma) record some of the first animal communities. The in-situ preservation of these sessile organisms means that the positions and sizes of specimens on the bedding planes encapsulate their life-histories, enabling spatial analyses to reconstruct their ecological dynamics. However, it is not known how these Ediacaran ecological dynamics vary across large spatial scales. Fortunately, the E and G surfaces at Mistaken Point, Newfoundland (∼565 Ma) crop out at multiple locations, providing the opportunity to compare ecological dynamics between communities separated by large spatial scales (∼800 m). In this study, we collected data from two outcrops each of E and G surfaces using a combination of laser-line probe, LiDAR and photogrammetry. We mapped out Mistaken Point G surface over 7.22 m&lt;sup&gt;2&lt;/sup&gt;, finding 9 frondose taxa across 158 specimens Watern Cove East G surface across 154 m&lt;sup&gt;2&lt;/sup&gt; (93 m&lt;sup&gt;2&lt;/sup&gt; when fractures are excluded) finding 19 frondose taxa across 1320 specimens; and Watern Cove West E Surface across 20.02 m&lt;sup&gt;2&lt;/sup&gt;, finding 11 frondose taxa across 734 specimens. We compared the Watern Cove West E surface with previously collected data from Mistaken Point E Surface, which had 2977 specimens over 85.42 m&lt;sup&gt;2&lt;/sup&gt;. The two G outcrops exhibited remarkably similar community compositions, both dominated by &lt;em&gt;Bradgatia&lt;/em&gt; with high proportions of frondose rangeomorphs and arboreomorphs. In contrast, the compositions between the E surfaces were notably different, with Watern Cove West E surface showing relatively higher proportions of &lt;em&gt;Fractofusus&lt;/em&gt; and &lt;em&gt;Bradgatia&lt;/em&gt; and lower proportions of frondose taxa&lt;em&gt;.&lt;/em&gt; For comparisons of population ecology between the outcrops, only &lt;em&gt;Bradgatia&lt;/em&gt; (G) and &lt;em&gt;Fractofusus&lt;/em&gt; (E) populations occurred in sufficient numbers to enable spatial analyses. We quantified the spatial distributions using spatial point process analyses, finding for E surfaces that the &lt;em&gt;Fractofusus&lt;/em&gt; populations showed significantly similar spatial patterns, which indicated reproductive events. In contrast, on G surface, the &lt;em&gt;Bradgatia&lt;/em&gt; populations show remarkably different underlying processes, with the Watern Cove East population showing reproductive clusters on a background environmental heterogeneity, whereas the Mistaken Point population shows spatial segregation, indicating intra-specific competition. The Watern Cove East &lt;em&gt;Bradgatia&lt;/em&gt; have a much lower density than those on Mistaken Point, suggesting that the increased density leads to competition due to insufficient resources to maintain this higher density. In modern deep-sea benthic communities, increased population densities occur within communities when different areas are subject to different flow regimes, and so different nutrient flux. Our results suggest that the Ediacaran communities of Mistaken Point show variability in ecological dynamics,","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104818"},"PeriodicalIF":4.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}