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    Wyświetlanie 1-9 z 9
    Tytuł:
    Tetrapod trace fossils from lowermost Jurassic strata of the Moenave Formation, northern Arizona, USA
    Autorzy:
    Tanner, L.
    Lucas, S.
    Tematy:
    burrows
    tetrapod
    cynodont
    tritylodontid
    rhizolith
    Moenave
    Lower Jurassic
    Pokaż więcej
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Powiązania:
    https://bibliotekanauki.pl/articles/2061343.pdf  Link otwiera się w nowym oknie
    Opis:
    At Moenkopi Wash along the Ward Terrace escarpment of northern Arizona strata of the upper Dinosaur Canyon Member of the Moenave Formation contain sedimentary structures we interpret as casts of tetrapod burrows. Sandstone casts and in situ burrows occur concentrated in two horizons that extend several hundred meters along the Ward Terrace escarpment. The structures, hosted in beds of eolian sandstone, form interconnecting networks of burrows that branch at right angles. Individual burrow casts have sub-circular cross sections and consist of nearvertical tunnels and horizontal to low-angle galleries that connect to larger chambers. Most burrow casts measure 5 to 15 cm in diameter, are filled by sandstone of similar grain size as the host rock, and have walls that are unlined and lack external ornamentation. Bedding plane exposure of the lower horizon reveals that the density of burrows exceeds 30 vertical tunnels per square meter. One exposure in the upper horizon reveals burrows concentrated in a mound-like structure with 1 m of relief. Rhizoliths, distinguished from burrows by their typical smaller diameters, calcareous infilling, and downward branching, co-occur with these burrows in the upper horizon. The fossil burrows in the Moenave Formation appear to have been constructed by a fossorial tetrapod with social behavior similar to the modern Mediterranean blind mole-rat. Although no skeletal remains are associated with the burrows, the fossil record suggests that the most likely producers of the Moenave burrows were tritylodontid cynodonts.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Whitmore Point Member of the Moenave Formation: Early Jurassic Dryland Lakes on the Colorado Plateau, Southwestern USA
    Autorzy:
    Tanner, L.
    Lucas, S.
    Tematy:
    Utah
    Arizona
    Hettangian
    Moenave Formation
    meromictic
    dryland
    perennia
    ephemeral
    lacustrine
    Pokaż więcej
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Powiązania:
    https://bibliotekanauki.pl/articles/2061348.pdf  Link otwiera się w nowym oknie
    Opis:
    The Lower Jurassic Whitmore Point Member of the Moenave Formation in Arizona-Utah, USA, comprises fish- and coprolite-bearing shales, siltstones, sandstones, and minor limestones. These facies were deposited in ephemeral and perennial lakes subject to episodic desiccation and incursions of coarse clastics during floods. Meromictic conditions developed during perennial episodes, probably due to salinity stratification, which enhanced preservation of organic matter in gray to black shales. These lakes formed on the floodout of a north-northwest oriented (relative to modern geography) system of mainly ephemeral streams on a broad and open floodplain. The Whitmore Point Member both overlies and interfingers laterally with alluvial red-bed facies of the Dinosaur Canyon Member of the Moenave Formation. The vertical transition from alluvial to lacustrine sedimentation recorded by the Dinosaur Canyon and Whitmore Point members of the Moenave Formation most probably resulted from a eustatically-controlled rise in base level during the Early Jurassic (Hettangian). The Dinosaur Canyon Member also interfingers laterally with eolian dune deposits of the Wingate Sandstone, which was deposited by winds that reworked coastal plain sediments to the north of the study area. Thus, on this part of the Colorado Plateau, fluvial, lacustrine and eolian sedimentary facies were deposited contemporaneously in laterally adjacent paleoenvironments.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetostratigraphy and paleopoles of the Kayenta Formation and the Tenney Canyon Tongue
    Autorzy:
    Steiner, M.
    Tanner, L.
    Tematy:
    Pliensbachian magnetostratigraphy
    Kayenta Formation
    paleopole
    J-1 cusp
    North America
    formacja Kayenta
    szpic J-1
    Ameryka Północna
    Pokaż więcej
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Powiązania:
    https://bibliotekanauki.pl/articles/2077334.pdf  Link otwiera się w nowym oknie
    Opis:
    The Kayenta Formation is the third in a series of stratigraphic units making up the Glen Canyon Group that were sampled along US Hwy 89 in southern Utah. The Kayenta is dominantly reversed polarity with a number of very short normal polarity intervals. Above the Kayenta and interbedded in the Navajo Sandstone is the Tenney Canyon Tongue of the Kayenta Formation. The lower half of the Tenney Canyon Tongue was also sampled and is dominantly normal polarity with three short reversed polarity intervals. The dominantly reversed magnetostratigraphy of the Kayenta appears to match that of Early Pliensbachian polarity interval “e-Pli R.” The dominance of normal polarity of the Tenney Canyon Tongue suggests that the Tenney Canyon may have been deposited in the upper half of the Pliensbachian polarity interval “ePli-N.” The suggested polarity matches indicate that the Kayenta and Tenney Canyon Tongue strata are 187–190 Ma in age. The paleopoles of the two units are statistically identical. The combined data of the Kayenta-Springdale-Whitmore Point show that the J-1 cusp terminated before the deposition of the Kayenta Formation. The North American continent/pole returned to its Late Triassic position during/after Springdale time, apparently along the same path used to reach the apex of the J-1 cusp.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pedogenic and lacustrine features of the Brushy Basin Member of the Upper Jurassic Morrison Formation in western Colorado: Reassessing the paleoclimatic interpretations
    Autorzy:
    Tanner, L.
    Galli, K.
    Lucas, S.
    Tematy:
    aridisol
    inceptisol
    calcrete
    palustrine
    lacustrine
    pedogenesis
    pedogeneza
    jeziorny
    bagienny
    Pokaż więcej
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Powiązania:
    https://bibliotekanauki.pl/articles/2077335.pdf  Link otwiera się w nowym oknie
    Opis:
    Study of the pedogenic features of the Upper Jurassic Morrison Formation in western Colorado, USA, shows a clear difference in the types of paleosols between the strata of the lower and upper Brushy Basin Member. Lower Brushy Basin paleosols are mostly calcareous Aridisols with Stage I through Stage III calcrete Bk horizons, abundant root traces, occasional vertic features, but only rarely with ochric epipedons. Upper Brushy Basin paleosols are mainly thicker and commonly display ochric epipedons and well-developed Bt and Bw horizons. We assign these paleosols to the order Inceptisol. Limestones occur in the Brushy Basin Member and include both uniformly micritic limestones and limestones with strongly brecciated textures. The former contain sparse body fossils and charophyte debris, while the latter are characterized by clotted-peloidal fabrics with circumgranular cracking and silica replacement. We interpret these limestones as the deposits of carbonate in small water bodies on a low-gradient flood plain, with the textures resulting from pedogenic reworking of the carbonate sediment. We find no evidence for the presence of extensive lacustrine or wetlands (Lake T’oo’dichi’) deposits in the study area. The paleoclimate suggested by all of these features is strongly seasonal, but subject to variations on orbital (precessional and higher) timescales causing intervals of semi-aridity during weaker monsoons, to alternate with sub-humid periods during stronger monsoons. The apparent long-term change in climate during Brushy Basin deposition potentially resulted from northward drift of North America.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined dark matter searches towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS
    Autorzy:
    van der Walt, J.
    Giacinti, G.
    Hueyotl-Zahuantitla, F.
    McGrath, C.
    Joshi, V.
    Pueschel, E.
    Ostrowski, Michał
    Le Stum, S.
    Roache, E.
    Hawc
    Huber, D.
    Fegan, S.
    Reville, B.
    Berley, D.
    Senniappan, M.
    Ribeiro, D.
    Mares, A.
    Tollefson, K.
    Reynolds, P.
    Schutte, H.
    Cotzomi, J.
    Davids, H.
    Baghmanyan, V.
    Noel, Angel
    Moore, C.
    Holler, M.
    Kieda, D.
    Taylor, A.
    Lemoine-Goumard, M.
    Garfias, F.
    DuVernois, M.
    Smith, A. J.
    Herzog, I.
    Rudak, B.
    Nellen, L.
    Nisa, M. U.
    Feng, Q.
    Salesa Greus, F.
    Thiersen, H.
    Cotter, G.
    Naurois (de), M.
    O'Brien, P.
    Brun, F.
    Werner, F.
    Martinez Castellanos, I.
    Frans, L.
    Kleiner, T.
    Barbosa Martins, V.
    Springer, W. R.
    Barnard, M.
    Foote, G.
    Aharonian, F.
    Moriarty, P.
    Gallant, Y.
    Terrier, R.
    Tsuji, N.
    Steenkamp, R.
    Moderski, R.
    Hüntemeyer, P.
    Giuri, C.
    Thorpe-Morgan, C.
    Zacharias, M.
    Alfaro, R.
    Nayerhoda, A.
    Wood, J.
    Peron, G.
    Harding, J. P.
    Schaefer, J.
    Fuessling, M.
    Surajbali, P.
    Buckley, J.
    Archer, A.
    Turner, R.
    Kostunin, D.
    Lypova, I.
    Sailer, S.
    Steinmassl, S.
    Goodman, J. A.
    Chromey, A.
    Diaz Hernandez, R.
    Kasai, E.
    Catalano, J.
    Espinoza Hernández, M. C.
    Arteaga Velazquez, J. C.
    Khangulyan, D.
    Morales Soto, J. A.
    Salzmann, H.
    Alvarez, C.
    Murach, T.
    Benbow, W.
    Newbold, M.
    Rosa-Gonzalez, D.
    Moreno Barbosa, E.
    Garcia Aguilar, D.
    Pérez Pérez, E. G.
    Kertzman, M.
    Majumdar, J.
    Katarzynski, K.
    Curlo, M.
    Gueta, O.
    Matthews, J.
    Torres Escobedo, R.
    Rowell, G.
    Mostafa, M.
    Marx, R.
    Vargas, H. Leon
    Villaseñor, L.
    Meyer, M.
    Damascene Mbarubucyeye, J.
    Weinstein, A.
    Leuschner, F.
    Tavernier, T.
    Zmija, A.
    Mackey, J.
    Williamson, T.
    Holder, J.
    Anguener, O.
    Reichherzer, P.
    Patel, S.
    Schoorlemmer, H.
    Lennarz, D.
    Malone, K.
    Poireau, V.
    Caroff, S.
    Avila Rojas, D. O.
    Tsirou, M.
    Takahashi, T.
    Batzofin, R.
    Engel, K.
    Brill, A.
    Santangelo, A.
    Mukherjee, R.
    Jankowsky, F.
    Belmont-Moreno, E.
    Camacho, J. R. Angeles
    Davids, I. D.
    Chambery, P.
    Lenain, J. P.
    Einecke, S.
    Ayala Solares, H. A.
    Fan, J.
    Devin, J.
    Panny, S.
    Wagner, S.
    Steppa, C.
    Ashkar, H.
    Kaaret, P.
    Haupt, M.
    van Rensburg, C.
    Yodh, G.
    Armstrong, T.
    Glawion, D.
    Lee, W. H.
    Kukec Mezek, G.
    Lundy, M.
    Shiningayamwe, K.
    Simoni, R.
    Fang, K.
    Grondin, M. H.
    Remy, Q.
    Linnemann, J.
    Zouari, S.
    Brisbois, C.
    Rho, C. D.
    Veritas
    Huang, Z.
    Bernloehr, K.
    Noriega-Papaqui, R.
    Gabici, S.
    Taboada, I.
    Marcowith, A.
    Bony (de), M.
    Lara, A.
    Schwanke, U.
    Otte, A.
    Gent, A. E.
    Ait-Benkhali, F.
    Seyffert, A.
    Lemiere, A.
    Quinn, J.
    Punch, M.
    Goksu, H.
    Nievas-Rosillo, M.
    Mohrmann, L.
    Oberholzer, L. L.
    Sun, L.
    Huang, D.
    Puehlhofer, G.
    Marti'i-Devesa, G.
    Schneider, M.
    Christiansen, J.
    Hoischen, C.
    Chaparro-Amaro, O.
    Dreyer, L.
    Zanin, R.
    Salazar, H. I.
    Hanna, D.
    Kundu, A.
    Glicenstein, J. F.
    Żywucka, N.
    Yusafzai, A.
    Durocher, M.
    Nakashima, K.
    Jamrozy, Marek
    Adams, C.
    Falcone, A.
    Tomankova, L.
    Capistrán Rojas, T.
    Humensky, T. B.
    Pita, S.
    Vasileiadis, G.
    Sembroski, G.
    Hinton, J.
    Luis-Raya, G.
    White, R.
    Lee, J.
    Carramiñana, A.
    Giunti, L.
    Wang, X.
    Mitchell, A.
    Reimer, A.
    Miranda-Romagnoli, P.
    Zhou, H.
    Giavitto, G.
    McEnery, J.
    de la Fuente, E.
    Ernenwein, J. P.
    Serna-Franco, J.
    Reimer, O.
    Ryan, J.
    Funk, S.
    Flores, J. L.
    Caballero Mora, K. S.
    Jhee, H.
    Sahakian, V.
    Kunwar, S.
    Egberts, K.
    Pohl, M.
    Yassin, H.
    Lamanna, G.
    Feijen, K.
    Gillanders, G.
    Kunde, G. J.
    Rueda Ricarte, H.
    Jin, W.
    BenZvi, S.
    Sanchez, D.
    Konno, R.
    van Soelen, B.
    Tuffs, R.
    Barber, A. S.
    Patel, S. R.
    Davies, J.
    Boisson, C.
    Pfrang, K.
    González, M. M.
    Doroshenko, V.
    O'Brien, S.
    Kreter, M.
    Katz, U.
    Díaz Vélez, J. C.
    Dmytriiev, A.
    Rieger, F.
    Dingus, B.
    Wierzcholska, Alicja
    Coutiño de Leon, S.
    Ona-Wilhelmi (de), E.
    Sandoval, A.
    Sasaki, M.
    Willox, E.
    Maier, G.
    Niemiec, J.
    Backes, M.
    Berge, D.
    Cotti, U.
    Fleischhack, H.
    Watson, I. J.
    Kluzniak, W.
    Fortson, L.
    Chen, A.
    Becherini, Y.
    Stegmann, C.
    Tak, D.
    Marandon, V.
    Tluczykont, M.
    Fichet de Clairfontaine, G.
    Vassiliev, V.
    Ragan, K.
    Djannati-Ataï, A.
    Moulin, E.
    Prokoph, H.
    Pérez Araujo, Y.
    Ohm, S.
    Martinez, O.
    Santander, M.
    Chand, T. B.
    Uchiyama, Y.
    Watson, J. J.
    Marchegiani, P.
    Barnacka, Anna
    López-Coto, R.
    Meintjes, P.
    Sinnis, G.
    Quirrenbach, A.
    Kumar, S.
    Weisgarber, T.
    Klepser, S.
    Levy, C.
    Montanari, A.
    Shang, R. Y.
    Völk, H. J.
    Nieto, D.
    Lang, M.
    Torres, I.
    Abeysekara, A. U.
    Fick, B.
    Böttcher, M.
    Duffy, C.
    Hörbe, M.
    Wong, Y. W.
    Hernández Cadena, S.
    Renaud, M.
    Muller, J.
    Dalgleish, H.
    Ellsworth, R.
    Zdziarski, A.
    Peisker, A.
    Morris, P.
    Jung, I.
    Tanner, M.
    García-Torales, G.
    Bulik, T.
    Álvarez Romero, J. d. D.
    Horns, D.
    Casanova, S.
    Brose, R.
    Hofmann, W.
    Tanaka, T.
    Martínez Huerta, H.
    Schüssler, F.
    Ruiz-Velasco, E.
    Prokhorov, D.
    Vincent, P.
    Becerra González, J.
    Hui, M.
    Kosack, K.
    Romoli, C.
    Longinotti, A. L.
    Shapopi, J. N. S.
    Luashvili, A.
    Omodei, N.
    de León, C. L.
    Sadeh, I.
    Specovius, A.
    Spir-Jacob, M.
    Ruiz Velasco, E.
    Williams, D.
    Spencer, S. T.
    Cangemi, F.
    Martínez-Castro, J.
    Hervet, O.
    Jardin-Blicq, A.
    Stawarz, Łukasz
    Zargaryan, D.
    Farrell, K.
    Bolmont, J.
    Sinha, A.
    Lohse, T.
    Ong, R.
    Furniss, A.
    Venter, C.
    Khelifi, B.
    Zhu, S.
    Malyshev, D.
    Spackman, H.
    Breuhaus, M.
    Albert, A.
    Diaz, L.
    Zepeda, A.
    Komin, N.
    Veh, J.
    Abdalla, H.
    Holch, T.
    Iriarte, A.
    Fiasson, A.
    Kollamparambil, A. B.
    García-Luna, J. L.
    Vink, J.
    Capasso, M.
    van Eldik, C.
    Fraija, N. I.
    Parsons, D.
    Hona, B.
    Olivera-Nieto, L.
    Bylund, T.
    Zech, A.
    Hattingh, S.
    Fernandez Alonso, M.
    Arcaro, C.
    Rivière, C.
    Bi, B.
    Du Plessis, L.
    Ureña-Mena, F.
    Armand, C.
    Donath, A.
    Babu, R.
    Garcia-Gonzalez, J. A.
    Maurin, G.
    Fontaine, G.
    Hermann, G.
    Humensky, B.
    Prado, R.
    Errando, M.
    Sol, H.
    Lundeen, J.
    Panter, M.
    Opis:
    Cosmological and astrophysical observations suggest that 85% of the total matter of the Universe is made of Dark Matter (DM). However, its nature remains one of the most challenging and fundamental open questions of particle physics. Assuming particle DM, this exotic form of matter cannot consist of Standard Model (SM) particles. Many models have been developed to attempt unraveling the nature of DM such as Weakly Interacting Massive Particles (WIMPs), the most favored particle candidates. WIMP annihilations and decay could produce SM particles which in turn hadronize and decay to give SM secondaries such as high energy 𝛾 rays. In the framework of indirect DM search, observations of promising targets are used to search for signatures of DM annihilation. Among these, the dwarf spheroidal galaxies (dSphs) are commonly favored owing to their expected high DM content and negligible astrophysical background. In this work, we present the very first combination of 20 dSph observations, performed by the Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS collaborations in order to maximize the sensitivity of DM searches and improve the current results. We use a joint maximum likelihood approach combining each experiment’s individual analysis to derive more constraining upper limits on the WIMP DM self-annihilation cross-section as a function of DM particle mass. We present new DM constraints over the widest mass range ever reported, extending from 5 GeV to 100 TeV thanks to the combination of these five different 𝛾-ray instruments.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Inne
    Tytuł:
    Same data, different analysts : variation in effect sizes due to analytical decisions in ecology and evolutionary biology
    Autorzy:
    Thawley, Christopher J.
    Ferreira-Arruda, Thalita
    Rugemalila, Deusdedith
    Taff, Conor Claverie
    Hager, Heather A.
    Schmoll, Tim
    Ke, Alison
    Fisher, David N.
    Payo-Payo, Ana
    Mos, Benjamin
    Abbey-Lee, Robin N.
    Martin, Charles A.
    Manrique-Garzon, Laura Milena
    Michelangeli, Marcus
    Shapiro, Julie Teresa
    Rosenberg, Michael S.
    Schroeder, Julia
    Cox, Murray P.
    Novotny, Jessie Lanterman
    Santos, Leticia Pereira
    Kačergytė, Ineta
    Muraina, Taofeek Olatunbosun
    Griffith, Frances J.
    Riva, Federico
    Paterson, John Harold
    García-Cervigón, Ana I.
    Camerlenghi, Ettore
    Macphie, Kirsty H.
    Schmidt, Marcus
    Youngflesh, Casey
    Palacio, Facundo Xavier
    Campbell, Sara E.
    Skupien, Fabrício Luiz
    Keogan, Katharine
    Perry, Kayla I.
    Bell, Kristian
    Good, Megan Kate
    Harrison, Natasha Dean
    Paquet, Matthieu
    Zilio, Giacomo
    Pottier, Patrice
    Organ, Chris L.
    Döbert, Timm Fabian
    Greenler, Skye M.
    Marchand, Philippe
    Smith, Jeremy A.
    Elmore, Jared Alan
    Turnell, Biz R.
    Jucker, Tommaso
    Gandy, Sara L.
    Verrelli, Brian C.
    Atkins, Jeff W.
    Razafindratsima, Onja H.
    Vélez, Juliana
    Johnsson, Martin
    Crouch, Connor Davidson
    de Sousa, Alexandra Allison
    Martin, Dominic Andreas
    Tanentzap, Andrew J.
    Walker, Xanthe J.
    Wolfson, David William
    Bradham, Jennifer
    Ross, Jessica
    Atkinson, Joe
    Barrett, Meghan
    Gould, Elliot
    Shearer, Caroline L.
    Wood, Andrew
    Law, Alan
    Kaltz, Oliver
    Gliksman, Daniel
    Drobniak, Szymon
    Hagan, James G.
    van Oordt, Francis
    Hsu, Bin-Yan
    Billman, Peter D.
    de Lima, Daniela Oliveira
    Blake, Shannon
    Finch, Elizabeth A.
    Kothari, Shan
    Griffith, Daniel M.
    Herrera-Chaustre, María Laura
    Slinn, Heather Lea
    Ramananjato, Veronarindra
    Zimmer, Cédric
    Meiners, Scott J.
    Martinig, April Robin
    Goslee, Sarah C.
    Campos, Leonardo L. F.
    Gilles, Marc
    Duffy, Alexandra Grace
    Baker, Christopher M.
    Vergara-Florez, Diana Carolina
    Santostefano, Francesca
    Tompkins, Emily M.
    Dunn, Robert P.
    Dobson, Adam J.
    Salazar, Stephen M.
    Eberhart-Hertel, Luke
    Kochan, David P.
    Takola, Elina
    Géron, Charly
    Freund, Cathryn A.
    Blake, Charlie K.
    Chik, Heung Ying Janet
    Telford, Richard J.
    Magellan, Kit
    Zimmerman, Gregory Mark
    Bertram, Michael Grant
    Luquet, Martin
    Roast, Michael James
    Nooten, Sabine S.
    Hamilton, Daniel G.
    D’Amelio, Pietro B.
    Goldspiel, Harrison B.
    Mortensen, Jennifer
    Vanderwel, Mark C.
    Yen, Jian D. L.
    Niemelä, Petri
    McCallum, Erin S.
    Malm, Lisa E.
    Trlica, Andrew
    Christie, Alec Philip
    Mair, Magdalena M.
    Weaver, Ryan J.
    Salmón, Pablo
    Caravaggi, Anthony
    Harris, Jonathan Philo
    Elsherif, Mahmoud Medhat
    Vitali, Valerio
    Murphy, Penelope Wrenn
    Aloni, Irith
    Havird, Justin Chase
    Sánchez-Tójar, Alfredo
    English, Holly M.
    Pedersen, Karen Marie
    Clark, Bethany L.
    Walker, Jeffrey
    Brand, Jack A.
    Schtickzelle, Nicolas
    Zitomer, Rachel A.
    Kusch, Jillian M.
    Larson, Courtney L.
    Haesen, Stef
    Chunco, Amanda J.
    Moiron, Maria
    Heaton, Andrew J.
    Schilling, Hayden T.
    Killion, Alexander K.
    Lagisz, Malgorzata
    Bulla, Martin
    Tarjuelo, Rocío
    Hasnain, Sarah Syedia
    Sollmann, Rahel
    Fidler, Fiona
    Merkling, Thomas
    Grebe, Nicholas M.
    Román-Palacios, Cristian
    Frank, Graham S.
    Gomes, Dylan G. E.
    Kelly, Clint D.
    Simón, Diego
    Olin, Agnes Birgitta
    Bradfer-Lawrence, Tom
    Manhart, Michael
    Whelan, Shannon
    Villamil, Nora
    Cressman, Kimberly A.
    Alcaraz, Carles
    Griffioen, Maaike
    Fernandez-Juricic, Esteban
    Cardoso, Pedro
    Russell, Avery L.
    Jung, Martin
    Girndt, Antje
    Fiorenza, Evan A.
    Bordes, Camille Nina Marion
    McCauley, Mark
    Saccone, Patrick
    Gratton, Paolo
    Tortorelli, Claire Marie
    Crotti, Marco
    Dobler, Ralph
    Fourcade, Yoan
    Griffith, Simon C.
    Rocha, Felipe Pereira
    Nelli, Luca
    Sutton, Guy F.
    Ensminger, David C.
    Beltrán, Iván
    Martin, Jake Mitchell
    Keppeler, Friedrich Wolfgang
    Boyd, Melissa Anna
    Gosnell, J. Stephen
    Waryszak, Pawel
    Brengdahl, Martin I.
    Lindsay, Shane
    Chuang, Angela
    Forstmeier, Wolfgang
    Tidau, Svenja
    Fieberg, John
    Johnson, Douglas H.
    Perez, Grégoire
    Lauterbur, M. Elise
    Kuppler, Jonas
    Mäntylä, Elina
    Thierry, Hugo
    Catanach, Therese A.
    Vanderwel, K. Michelle
    Bonisoli-Alquati, Andrea
    Sadeh, Asaf
    Iranzo, Esperanza C.
    Aguirre, Luis A.
    L’Herpiniere, Kiara
    Parker, Timothy H.
    Smith, Grania Polly
    Whitney, Kaitlin Stack
    Lembrechts, Jonas J.
    Choy, Emily Sarah
    Léandri-Breton, Don-Jean
    Bonnet, Timothée
    Dutta, Trishna
    Dunning, Jamie
    Garretson, Alexis C.
    Mandeville, Caitlin P.
    Iverson, Erik N. K.
    Nightingale, Josh
    Still, Shannon Michael
    Abbott, Jessica K.
    Parker, Darren James
    Ruuskanen, Suvi
    Fontaine, Amélie
    Scott, Drew A.
    Vanderwolf, Karen J.
    Ostevik, Kate L.
    Lievens, Eva J. P.
    Botterill-James, Thomas
    Berauer, Bernd J.
    Mammola, Stefano
    Geary, William L.
    Jimoh, Saheed Olaide
    Duncan, Alison B.
    Fraser, Hannah S.
    White, Rachel Louise
    Ge, Xuezhen
    Van de Vondel, Stijn
    Chen, Xuan
    Carroll, Charles J. W.
    Rowland, Freya E.
    Grames, Eliza M.
    Nakagawa, Shinichi
    Pascall, David J.
    Covernton, Garth A.
    Thomson, Jacqueline
    Pasquarella, Valerie J.
    Swallow, Ben
    Bliard, Louis
    Stuber, Erica F.
    Bello, Suleiman Kehinde
    Lauck, Katherine S.
    Grossman, Jake J.
    Urban, Lara
    Proulx, Raphaël
    Weller, Daniel L.
    Roche, Dominique G.
    Larkin, Daniel J.
    Boyle, Sarah A.
    Korsten, Peter
    Contina, Andrea
    Proulx, Michael J.
    Van Eeckhoven, Jens
    Ferguson, Stephen M.
    Sharma, Nitika
    Marshall, Benjamin Michael
    Nolazco, Sergio
    Schultz, Nick L.
    Kim, Dongmin
    Lalla, Kristen Marianne
    Ernst, Ulrich Rainer
    Rennison, Diana J.
    Güncan, Ali
    Riyahi, Sepand
    Moreira, Bruno
    Iannarilli, Fabiola
    Wedegärtner, Ronja E. M.
    Yanco, Scott W.
    Randimbiarison, Finaritra Tolotra
    Vollering, Julien
    Schneider, Adam C.
    Vesk, Peter A.
    McNew, Sabrina M.
    Arekar, Kunal
    Nilsonne, Gustav
    Bose, Aneesh P. H.
    Walter, Jonathan A.
    Gannon, Dustin G.
    Howard, Tanner J.
    Scroggie, Michael Peter
    Doherty, Tim S.
    Sitvarin, Michael I.
    Vieira, Marcus Vinícius
    Altschul, Drew
    Fuentes-Lillo, Eduardo
    Pruett, Jessica L
    Schrock, Allie E.
    Sales, Kris
    MacLeod, Ross
    Jorna, Jesse
    Bussière, Luc
    van der Wal, Jessica Eva Megan
    Opis:
    Although variation in effect sizes and predicted values among studies of similar phenomena is inevitable, such variation far exceeds what might be produced by sampling error alone. One possible explanation for variation among results is differences among researchers in the decisions they make regarding statistical analyses. A growing array of studies has explored this analytical variability in different fields and has found substantial variability among results despite analysts having the same data and research question. Many of these studies have been in the social sciences, but one small “many analyst” study found similar variability in ecology. We expanded the scope of this prior work by implementing a large-scale empirical exploration of the variation in effect sizes and model predictions generated by the analytical decisions of different researchers in ecology and evolutionary biology. We used two unpublished datasets, one from evolutionary ecology (blue tit, Cyanistes caeruleus, to compare sibling number and nestling growth) and one from conservation ecology (Eucalyptus, to compare grass cover and tree seedling recruitment). The project leaders recruited 174 analyst teams, comprising 246 analysts, to investigate the answers to prespecified research questions. Analyses conducted by these teams yielded 141 usable effects (compatible with our meta-analyses and with all necessary information provided) for the blue tit dataset, and 85 usable effects for the Eucalyptus dataset. We found substantial heterogeneity among results for both datasets, although the patterns of variation differed between them. For the blue tit analyses, the average effect was convincingly negative, with less growth for nestlings living with more siblings, but there was near continuous variation in effect size from large negative effects to effects near zero, and even effects crossing the traditional threshold of statistical significance in the opposite direction. In contrast, the average relationship between grass cover and Eucalyptus seedling number was only slightly negative and not convincingly different from zero, and most effects ranged from weakly negative to weakly positive, with about a third of effects crossing the traditional threshold of significance in one direction or the other. However, there were also several striking outliers in the Eucalyptus dataset, with effects far from zero. For both datasets, we found substantial variation in the variable selection and random effects structures among analyses, as well as in the ratings of the analytical methods by peer reviewers, but we found no strong relationship between any of these and deviation from the meta-analytic mean. In other words, analyses with results that were far from the mean were no more or less likely to have dissimilar variable sets, use random effects in their models, or receive poor peer reviews than those analyses that found results that were close to the mean. The existence of substantial variability among analysis outcomes raises important questions about how ecologists and evolutionary biologists should interpret published results, and how they should conduct analyses in the future.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
      Wyświetlanie 1-9 z 9

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