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Contributions to the knowledge of Antarctodon sobrali(Mammalia:Astrapotheria)from the Eocene of Antarctica

Advances in Polar Science 2024年第1期35卷 48-62页

作者： Javier n.GELFO Consejo nacional de Investigaciones Científicasy Técnicas(COnICET) Buenos Aires C1425FQBArgentina División Paleontología Vertebrados Museo de La PlataFacultad de Ciencias Naturales y Museo de La PlataUniversidad Nacional de La PlataLa Plata B1900FWAArgentina

The Astrapotheria constitutes one of the five orders of extinct South American native ungulates,with a fossil record that also extends to the Eocene of the Antarctic *** contrast to the abundant specimens known for litoptern Sparnotheriodontidae and metatherians,astrapotheres are represented by scant remains assigned to the endemic Antarctodon sobrali and indeterminate astrapotheres,restricted to levels 35C_(u0)and 35n of the Cucullaea I Allomember of the La Meseta *** discovery of alower molar assignable to this species in the Eocene levels of Seymour(Marambio)Island,enables a revision of the diagnosis and the homologies of the dental characters used to describe this taxon.A reanalysis of its phylogenetic relationships reveals the nearly simultaneous presence of basal astrapotheres in the early Eocene of Itaboraí(Brazil),Patagonia,and West *** taxa are characterized by lacking dental specializations usually associated with more abrasive diets like terminal forms of Uruguaytheriinae and *** appears to have thrived on the Antarctic continent during the Early Eocene Climatic Optimum within the paleoclimatic context of a hot-house *** present conditions in Antarctica where no terrestrial mammals inhabit,the early Eocene climate was characterized by warmer temperatures and a biologically diverse environment rich in primary producers,dominated by nothofagus forests,encompassing both deciduous and evergreen forests,which supported a diverse assemblage of continental vertebrates.

关键词： Astrapotheria Antarctodon Eocene Seymour Island La Meseta Formation

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Review of the Cretaceous avian diversity of Antarctica:a changing scenario for the evolution of early neornithine birds

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Advances in Polar Science 2024年第1期35卷 1-13页

作者： Carolina ACOSTA HOSPITALECHE Facundo IRAZOQUI Paula BOnA Ariana PAULInA-CARABAJAL División Paleontología de Vertebrados Museo de La PlataFacultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataPaseo del Bosque s/nLa Plata B1900FWAArgentina Consejo nacional de Investigaciones Científicas y Técnicas(COnICET) Buenos Aires C1425FQBArgentina División Paleontología Vertebrados Museo de La Plata-Anexo ⅡFacultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataCalles 122 y 60La Plata B1900FWAArgentina Instituto de Investigaciones en Biodiversidad y Medioambiente(InIBIOMA) Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional del ComahueSan Carlos de Bariloche R8400GAMArgentina

The worldwide record of Cretaceous neornithes and neornithine-like birds is both controversial and poorly ***,in recent years,the Antarctic continent has yielded a substantial number of Maastrichtian avian specimens,contributing significantly to our understanding of the early evolution of this ***,the keen interest and collaborative efforts of various paleornithologists have resulted in a wealth of knowledge,which we have thoroughly reviewed,updated,and discussed in the context of recent discoveries.

关键词： Maastrichtian Antarctic Peninsula Vega Island Seymour(Marambio)Island neornithes birds

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The fossil record of Antarctic land mammals:commented review and hypotheses for future research

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Advances in Polar Science 2019年第3期30卷 274-292页

作者： Javier nGELFO Francisco JGOIn nicolás BAUZá Marcelo REGUERO Consejo nacional de Investigaciones Científicas y Técnicas(COnICET) ArgentinaGodoy Cruz 2290C1425FQBCABAArgentina División Paleontología Vertebrados Museo de La Plata.Paseo del Bosque s/nB1900FWALa PlataArgentina Facultad de Ciencias naturales y museo de La Plata Universidad Nacional de La PlataArgentina MORPHOS Lab Facultad de Ciencias Naturales y Museo de La PlataUniversidad Nacional de La Plata Instituto Antártico Argentino 25 de Mayo 1143B1650HMKSan MartínBuenos AiresArgentina

The fossil record of terrestrial mammals in Antarctica is temporally and geographically constrained to the Eocene outcrops of La Meseta and Submeseta formations in Seymour(Marambio)Island in West *** faunal assemblage indicates a clear South American imprint since all the groups have a close phylogenetic relationship with Cretaceous and Paleogene mammals from *** the presence of several mammalian taxonomic groups:Dryolestida,Gondwanatheria,Eutheria and Metatheria,the presence of other major mammalian taxa should be expected and will probably be confirmed by new *** mammals with an inferred body mass between 10 to 400 kg in size,are represented by xenarthrans,and two groups of the so called South American native ungulates:Astrapotheria and *** Metatheria are the smaller(less than 1 kg)and most abundant components of the *** are represented by derorhynchid ameridelphians,several microbiotherian australidelphians(both microbiotheriids and woodburnodontids),and?glasbiid prepidolopod and polydolopid ***,there are remains of several mammalian teeth of indeterminate phylogenetic *** present knowledge of the Southern Hemisphere mammalian evolution and paleogeographic change through time,indicates that Antarctica played a major role for land mammals,at least since the *** actual representation of Paleogene terrestrial mammals in Antarctica is most probably biased,as all the evidence indicates that australosphenidan mammals should be present in this continent since the Jurassic.

关键词： Antarctica James Ross Basin Jurassic Paleogene Eocene Mammalia

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The first record of dermochelyid turtles in the Eocene of Tierra del Fuego:new insights on the evolution of the Weddellian faunas

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Advances in Polar Science 2024年第1期35卷 63-77页

作者： Paula BOnA Juliana STERLI Marcelo Saúl de la FUEnTE Eduardo OLIVERO Marta S.FERnÁndeZ Marcelo REGUERO División Paleontología Vertebrados Museo de La Plata-Anexo IIFacultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataLa Plata B1900FWAArgentina Consejo nacional de Investigaciones Científicas y Técnicas(COnICET) Ciudad Autónoma de Buenos Aires C1425FQBArgentina museo Paleontológico Egidio Feruglio Trelew U9100Argentina Instituto de Evolución Ecología Histórica y Ambiente-CONICETSan Rafael CP5600Argentina Centro Austral de Investigaciones Científicas-COnICET Universidad Nacional de Tierra del FuegoUshuaia CP 9410Argentina División Paleontología Vertebrados Museo de La PlataUniversidad Nacional de La PlataLa Plata B1900FWAArgentina

The Antarctic Paleogene marine fossil record has been the key to reconstructing the evolution of the Weddellian Sea and final dismemberment of Southern *** this context,Eocene marine vertebrates from Seymour(Marambio)Island have provided valuable *** present the first Eocene record of marine reptiles from the southern Atlantic Coast of South *** corresponds to several postcranial turtle remains represented by a proximal end of the right humerus,three caudal and one thoracic vertebrae,a fragment of the left pubis,and ten ossicles of the dorsal carapace,coming from the Leticia Formation(late-mid Eocene)at Cabo Tiburones,Tierra del Fuego,*** materials show severalfeatures such as the size and general morphology of the humerus and vertebrae,and the presence of relatively small,irregular,smooth,and unkeeled ossicles,which allow us to assign them to dermochelyidae *** are a cosmopolitan group ofcryptodiran turtles,registered from the late Cretaceous up to the recent,with some physiological-biological peculiarities(e.g.,endothermy and an exclusive jellyfish-based diet)and characterized by the presence of an osseous carapace formed by *** new finding from the Leticia Formation is an addition to the scarce and extremely fragmentary record of Eocene dermochelyids from the southern seas like those from the La Meseta and Submeseta formations(Antarctica)and the Waihao and Burnside formations(new Zealand).This new information allows us to discuss the presence of these turtles in such high latitudes in the past and its implication in the evolution of the Weddellian fauna.

关键词： marine reptiles sea turtles dermochelyidae Paleogene La Meseta Formation Submeseta Formation Leticia Formation

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Hormonal control of seasonal color change in female spiny-footed lizards:an observational and experimental approach

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Current Zoology 2019年第6期65卷 633-642页

作者： Belen FRESnILLO Josabel BELLIURE Diego GIL Jose J.CUERVO department of Life Sciences Ecology SectionUniversity of AlcalaMadridSpain department of Functional and Evolutionary Ecology Estacion Experimental de Zonas Aridas(CSIC)Carretera de Sacramento s/nAlmerfaSpain department of Evolutionary Ecology Museo Nacional de Ciencias Naturales(CSIC)MadridSpain

Breeding coloration of females often signals aspects of their reproductive status,suggesting a link between color and sex steroid *** this study,we examined the relationships between 2 sex steroid hormones(progesterone and p-estradiol)and reproductive coloration in female spinyfooted lizards Acanthodactylus *** first explored natural variation in female plasma hormone levels and coloration during their reproductive cycle,p-estradiol was negatively related to brightness and positively related to red saturation,whereas progesterone was not significantly related to *** identifying key relationships,plasma hormone concentrations were manipulated by creating 3 experimental female groups(p-estradiol-treated,progesterone-treated,and control),and the effects on coloration were monitored,p-estradiol-treated females,in which there was a rise in both p-estradiol and progesterone levels,lost their red coloration earlier than females in the other 2 experimental groups,whereas progesterone treatment had no significant effect on female *** results suggest that high levels of either p-estradiol alone or(3-estradiol together with progesterone trigger the loss of red coloration in female spiny-footed lizards,and that progesterone alone does not affect *** hypothesize that changes in female breeding color might be regulated by(3-estradiol in species in which conspicuous coloration is displayed before ovulation,and by progesterone in species in which this color is displayed during gravidity.

关键词： color signaling enzyme immunoassay hormone-induced color change sex-specific coloration spectrophotometry transdermal hormone application

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Linking the hierarchical decision- making process of fruit choice and the phenotypic selection strength on fruit traits by birds

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Journal of Plant Ecology 2017年第4期10卷 713-720页

作者： Facundo X.Palacio Juan Manuel Girini Mariano Ordano Fundación Miguel Lillo Miguel Lillo 251CP T4000JFESan Miguel de TucumánTucumánArgentina Consejo nacional de Investigaciones Científicas y Técnicas(COnICET) Argentina Sección Ornitología División Zoología VertebradosFacultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataPaseo del Bosque s/nCP B1900FWALa PlataBuenos AiresArgentina

Aims Animals in search of fleshy fruits forage mostly according to the number of available fruits and then select individual fruits based on reward quality or advertised subtle *** hierarchical pat-tern of fruit choice would be translated into patterns of selection strength mediated by frugivores on fruit display ***,frugi-vores would exert higher selection pressures on fruit crop size and lower selection pressures on within-plant variation of phenotypic traits(infructescence,fruit and seed size).However,no attempt to link this behavioral mechanism of hierarchical trait selection to natural selection patterns has been ***,we sought to determine the relationship between the hierarchical decision-mak-ing process of fruit choice and patterns of natural selection on fruit *** We recorded bird visits and measured fruit-related traits(fruit crop size,fruit diameter and seed weight)in a natural population of Psychotria carthagenensis,a bird-dispersed treelet,in a Yungas for-est from *** assess phenotypic selection patterns on fruit display traits,we performed multivariate selection analysis,and to explicitly identify a hierarchy of fruit trait choice we used a classifi-cation tree as a predictive *** Findings Selection patterns on fruit display traits were in agreement with a hierarchical process of fruit choice made by *** strength of directional selection on the total number of fruits in a plant(*** crop size)was nearly two times higher than on fruit size,and the classification tree analysis supported this hierarchical *** results support previous evidence that seed dispersers shape fruit crop size with higher intensity than subindividual fruit ***,high levels of subindividual phenotypic variation of fruit display traits may be explained by relaxed selection pressures exerted by *** studies also show that this pattern may consti-tute a general phenomenon among other pl

关键词： plant-animal interactions seed dispersal selection gradients subindividual variation

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Phylogeography and morphometric variation in the Cinnamon Hummingbird complex:Amazilia rutila(Aves:Trochilidae)

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Avian Research 2021年第4期12卷 509-525页

作者： Melisa Vázquez-López nandadevi Córtes-Rodríguez Sahid M.Robles-Bello Alfredo Bueno-Hernández Luz E.Zamudio-Beltrán Kristen Ruegg Blanca E.Hernández-Baños museo de Zoología Facultad de CienciasUniversidad Nacional Autónoma de MéxicoApartado Postal04510 Mexico CityMexico department of Biology Ithaca CollegeIthacaNY 14850USA museo de Zoología Facultad de Estudios Superiores ZaragozaUniversidad Nacional Autónoma de MéxicoMexico CityMexico department of Biology Colorado State UniversityFort CollinsCO 80523USA

Background:The Mesoamerican dominion is a biogeographic area of great interest due to its complex topography and distinctive climatic *** area has a large diversity of habitats,including tropical deciduous forests,which house a large number of endemic ***,we assess phylogeographic pattern,genetic and morphometric variation in the Cinnamon Hummingbird complex Amazilia rutila,which prefers habitats in this *** resident species is distributed along the Pacific coast from Sinaloa—including the Tres Marías Islands in Mexico to Costa Rica,and from the coastal plain of the Yucatán Peninsula of Mexico south to ***:We obtained genetic data from 85 samples of ***,using 4 different molecular markers(mtDnA:nD2,COI;nDnA:ODC,MUSK)on which we performed analyses of population structure(median-joining network,STRU CTU RE,FST,AMOVA),Bayesian and Maximum Likelihood phylogenetic analyses,and divergence time *** order to evaluate the historic suitability of environmental conditions,we constructed projection models using past scenarios(Pleistocene periods),and conducted Bayesian Skyline Plots(BSP)to visualize changes in population sizes over *** analyze morphometric variation,we took measurements of 5 morphological traits from 210 study *** tested for differences between sexes,differences among geographic groups(defined based on genetic results),and used PCA to examine the variation in multivariate ***:Using mtDnA,we recovered four main geographic groups:the Pacific coast,the Tres Marías Islands,the Chiapas region,and the Yucatán Peninsula together with Central *** same groups were recovered by the phylogenetic results based on the multilocus *** based on BSP results showed constant population size over time throughout the *** complex and within each geographic *** niche model projec-tions onto past scenarios revealed no drastic changes in suitable conditions,but revealed some

关键词： Amazilia rutila Genetic structure Genetic variation Phylogeography Tres Marías Islands Trochilidae Tropical deciduous forest

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The reliability of morphometric discriminant functions in determining the sex of Chilean flamingos Phoenicopterus chilensis

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Current Zoology 2012年第6期58卷 851-855页

作者： Diego MOnTALTI Maricel GRA A GRILLI René E. MARAGLIAnO Guillermo CASSInI Cátedra de Ornitología Faeultad de Ciencias Naturales y Museo Paseo del Bosque B 1900FWA-La Plata Argentina COnICET Cerrito 1248 C1010AAZ-Buenos Aires Argentina Jardín Zoológico de La Plata Paseo del Bosque B1900-La Plata Argentina departamento de Ciencias Básicas Universidad National de Luján Ruta 5 y Av. Constitución B6700-Luján Buenos Aires Argentina

Monomorphic birds cannot be sexed visually and discriminant functions on the basis of external morphological variations are frequently used. Our objective was to evaluate the reliability of sex classification functions created from structural measurements of Chilean flamingos Phoenicopterus chilensis museum skins for the gender assignment of live birds. Five measurements were used to develop four discriminant functions： culmen, bill height and width, tarsus length and middle toe claw. The functions were tested on a sample of live flamingos from a zoo. The best classification for museum flamingos was given by a function using tarsus length, bill width and middle toe claw （97%）. However, this function did not give the best classification for the zoo-based flamingos （81%） which had the best sex assignment by a function including measurements of tarsus, culmen and bill height and width （85%）. This shows that a function giving good results in the sample from which it originated may not be as good when applied to another group of animals. Our study emphasizes the need for assessing the accuracy of a function by testing it with other methods to ensure its suitability when being applied .

关键词： Morphometrics Discriminant function Sexual dimorphism Sex classification

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Relationships between soil pollution by heavy metals and melanin-dependent coloration of a fossorial amphisbaenian reptile

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Integrative Zoology 2022年第4期17卷 596-607页

作者： JoséMARTÍn Pablo RECIO Gonzalo RODRÍGUEZ-RUIZ Isabel BARJA Eduardo GUTIÉRREZ Luis VGARCÍA departamento de Ecología Evolutiva Museo Nacional de Ciencias NaturalesCSICMadridSpain departamento de Zoología Facultad de BiologíaUniversidad Autónoma de MadridMadridSpain Centro de Investigación en Biodiversidad y Cambio Global(CIBC-UAM) Universidad Autónoma de MadridMadridSpain departamento de Biogeoquímica Ecología Vegetal y MicrobianaInstituto de Recursos Naturales y Agrobiología de SevillaCSICSevillaSpain

Melanin is the basis of coloration in many animals,and although it is often used in communication,thermoregulation,or camouflage,melanin has many other physiological *** example,in polluted habitats,melanin can have a detoxifying *** coloration would help to sequester in the skin the heavy metal contaminants from inside the body,which will be expelled to the exterior when the skin is ***,animals should have evolved more melanic colorations in more polluted habitats(“industrial melanism”hypothesis).We examined whether the fossorial amphisbaenian reptile,Trogonophis wiegmanni,is able to eliminate heavy metals,derived from soil pollution by seagull depositions,through sloughing its *** results suggest a covariation between levels of soil pollution by heavy metals and the concentration of heavy metals in the sloughed skins of *** suggests that amphisbaenians may expel heavy metals from their bodies when they slough the *** also tested whether amphisbaenians inhabiting soils with higher levels of heavy metal pollution had darker(melanin-dependent)body ***,contrary to predictions from the“industrial melanization”hypothesis,we found a negative relationship between soil pollution and proportions of melanic *** contradictory result could,however,be explained because heavy metals have endocrine disruption effects that increase physiological stress,and higher stress levels could result in decreased *** suggest that although amphisbaenians might have some detoxifying mechanism linked to melanin in the skin,this process might be negatively affected by stress and result ineffective under conditions of high soil pollution.

关键词： amphisbaenians coloration fossorial reptiles heavy metals melanin soil pollution

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The fossil record of birds from the James Ross Basin,West Antarctica

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Advances in Polar Science 2019年第3期30卷 251-273页

作者： Carolina ACOSTA HOSPITALECHE Piotr JADWISZCZAK Julia ACLARKE Marcos CEnIZO Consejo nacional de Investigaciones Científicas y Técnicas(COnICET) Godoy CruzArgentina División Paleontología Vertebrados Museo de La PlataFacultad de Ciencias Naturales y MuseoArgentina Institute of Biology University of BialystokBialystokPoland Jackson School of Geosciences The University of TexasAustinTexasUSA División Paleontología Museo de Historia Natural de La PampaSanta RosaLa PampaArgentina Fundación de Historia natural Félix de Azara Departamento de Ciencias Naturales y AntropologíaCEBBAD–Universidad MaimónidesBuenos AiresArgentina

The fossil record of birds from Antarctica is concentrated in the James Ross Basin,located in north-east of the Antarctic *** are here represented by an extensive Paleogene record of penguins(Sphenisciformes)and Cretaceous–Paleogene record of Anseriformes,followed by other groups with a minor representation(Procellariiformes,Falconiformes,and Pelagornithidae),and others previously assigned controversially to“Ratites”,Threskiornithidae,Charadriiformes,Gruiformes,Phoenicopteriformes,and *** provide a complete update of these records,commenting on the importance of some of these remains for the evolution of the major clades.

关键词： fossil avifauna Cretaceous Paleogene Seymour Island Vega Island

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