Ameghiniana最新文献_第10页

Consequences of Community Assembly Processes in Paleoclimate Estimation Using Angiosperm Fossil Woods 群落组装过程对利用被子植物化石估算古气候的影响

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-04-30 DOI: 10.5710/AMGH.11.12.2020.3391

Hugo I. Martínez-Cabrera, Emilio Estrada-Ruiz

{"title":"Consequences of Community Assembly Processes in Paleoclimate Estimation Using Angiosperm Fossil Woods","authors":"Hugo I. Martínez-Cabrera, Emilio Estrada-Ruiz","doi":"10.5710/AMGH.11.12.2020.3391","DOIUrl":"https://doi.org/10.5710/AMGH.11.12.2020.3391","url":null,"abstract":"Abstract. Community assembly processes (environmental filtering and limiting similarity) determine the values of quantitative functional traits within communities. The environment influences the number of viable functional strategies species might take. A strong effect of environmental filtering often results in communities having species with similar trait values and narrow functional niches. On the other hand, resource competition (i.e., limiting similarity) leads to communities with broader functional spaces and smaller niche overlap among competing species. The degree to which community assembly processes influence wood trait variation has important implications for paleoclimate estimation using fossil woods since the central tenet of the approach is environmental-driven trait convergence, which assumes a central role of environmental filtering. To infer the strength of these two community assembly forces, we used a functional diversity approach to determine how three wood anatomical traits vary in 14 extant communities (272 species) growing under different climates. We found smaller functional spaces in communities growing in dry/cool places, suggesting that trait convergence could be the result of more robust habitat filtering in these communities. A weaker environmental filtering in warm/wet environments, likely results in an amplification of other drivers that promote a higher number of hydraulic strategies through niche partition in highly structured communities. More complex ecological structures in mild, tropical places likely lead to a higher spread of wood trait values. This asymmetry in the strength of environmental filtering along climate gradients suggests that this differential strength of the trait-climate convergence should be incorporated in paleoclimate prediction models.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43475981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Actualistic Taphonomy in South America. 南美洲的现实Taphonomy。

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-03-18 DOI: 10.5710/1851-8044-58.1.72

Devapriya Chattopadhyay

引用次数: 0

The Fossil Record of Camelids (Mammalia, Cetartiodactyla) in Tucumán Province, Northwestern Argentina 阿根廷西北部图库曼省骆驼类动物化石记录

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-02-28 DOI: 10.5710/AMGH.27.11.2020.3353

Vanessa Torres-Carro, D. Garcia-Lopez, P. Ortiz

{"title":"The Fossil Record of Camelids (Mammalia, Cetartiodactyla) in Tucumán Province, Northwestern Argentina","authors":"Vanessa Torres-Carro, D. Garcia-Lopez, P. Ortiz","doi":"10.5710/AMGH.27.11.2020.3353","DOIUrl":"https://doi.org/10.5710/AMGH.27.11.2020.3353","url":null,"abstract":"Abstract. The presence of fossil camelids in Tucumán, northwestern Argentina, has been recognized for many years but its relevance has not been fully evaluated so far. Here, we review previous mentions of fossil camelids for this province, present new material, and compare it with fossil and extant specimens of South American camelids, clarifying its taxonomic context and discussing its paleobiogeographic significance. For Tucumán we recognize Vicugna vicugna (Tafí del Valle Formation, late Pleistocene–early Holocene) and Palaeolama sp. (Tucumán Formation, late Pleistocene), mainly based on size and dental features. The current distribution of V. vicugna is restricted to the Central Andes, in the Puna and High Andean environments over 3200 m altitude; there is no mention, neither current nor historical, for Tucumán. Its presence at around 2200 m in the Tafí valley during the Quaternary indicates cooler and drier conditions than those currently established. The observations made in the context of this contribution allow us to establish that the species V. provicugna is a synonym of V. vicugna. In turn, we consider that the validity of the species Palaeolama hoffstetteri, only based on postcranial remains, should be properly evaluated in the future.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41827634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Earliest Known Titanosaur Sauropod Dinosaur 已知最早的泰坦巨龙蜥脚类恐龙

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-02-28 DOI: 10.5710/AMGH.20.08.2020.3376

P. Gallina, J. Canale, J. Carballido

{"title":"The Earliest Known Titanosaur Sauropod Dinosaur","authors":"P. Gallina, J. Canale, J. Carballido","doi":"10.5710/AMGH.20.08.2020.3376","DOIUrl":"https://doi.org/10.5710/AMGH.20.08.2020.3376","url":null,"abstract":"Abstract. The titanosaur sauropod record of Patagonia, mainly recovered from Upper Cretaceous strata, is probably the richest worldwide. Here we present a new sauropod dinosaur, Ninjatitan zapatai gen. et sp. nov., from the Lower Cretaceous Bajada Colorada Formation (Berriasian–Valanginian) of north Patagonia (Neuquén Province, Argentina), from which postcranial remains are preserved. The anatomical analysis and comparisons performed in this specimen evidence strong affinity with titanosaur sauropods. This assumption is corroborated with the inclusion of the new taxon in an updated phylogenetic data matrix. The cladistic analyses indicate that Ninjatitan could be considered the earliest known titanosaur sauropod. The combination of features such as the presence of procoelous anterior caudal centra, the pneumatized neural arch of anterior caudal vertebrae, and the posterodorsal border of the scapular acromion near the glenoid level supports its titanosaur affinities. The presence of a basal titanosaurian sauropod in the lowermost Cretaceous of Patagonia supports the hypothesis that the group was established in the Southern Hemisphere and reinforces the idea of a Gondwanan origin for Titanosauria. The Bajada Colorada sauropod fauna represents one of the most diverse and unique associations from the lowermost Cretaceous worldwide recorded.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41429267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Revision of Botrychiopsis plantiana: A Key Species of the Gzhelian–Cisuralian in Westernmost Gondwana 冈瓦纳大陆最西部葛里阶-西苏里阶的一个关键种植物Botrychiopsis plantiana的修订

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-02-28 DOI: 10.5710/AMGH.28.09.2020.3355

Johana A. Fernández

引用次数: 0

New Insights on Pachybiotherium illuminatum(Mammalia, Marsupialia, Microbiotheriidae) from the Early Miocene of the Pinturas Formation (Santa Cruz Province, Argentina) 阿根廷圣克鲁斯省Pinturas组早中新世光照厚生兽(哺乳目，有袋目，微生物科)的新认识

IF 1 4区地球科学

Ameghiniana Pub Date : 2021-02-28 DOI: 10.5710/AMGH.01.09.2020.3371

Germán Barmak, L. Chornogubsky, L. Gaetano

引用次数: 0

Mites (Acari, Oribatida, Nanhermannidae) from the Eocene of Patagonia: First Southern Hemisphere Fossil Record in Marine Sediments 巴塔哥尼亚始新世的螨类(蜱螨，恙螨科，Nanhermannidae):南半球海洋沉积物的首个化石记录