Morphometric analysis of graphoglyptid trace fossils in two dimensions: implications for behavioral evolution in the deep sea

Paleobiology ◽  
2016 ◽  
Vol 42 (2) ◽  
pp. 317-334 ◽  
Author(s):  
James R. Lehane ◽  
A. A. Ekdale
Keyword(s):  
Late Cretaceous ◽  
Deep Ocean ◽  
Trace Fossils ◽  
Two Dimensions ◽  
Sudden Increase ◽  
Behavioral Evolution ◽  
Evolutionary Patterns ◽  
Evolutionary Changes ◽  
The Times ◽  
Over Time

AbstractGraphoglyptids are deep-marine trace fossils, often found preserved as casts in positive relief on the base of turbidites. Previous analyses of the behavioral evolution of graphoglyptids suggested they were slowly diversifying, becoming optimized, and getting smaller over time until the Late Cretaceous, when a sudden increase in diversification occurred. This current study quantifies the morphology of approximately 400 different graphoglyptid specimens, ranging in age from the Cambrian to the present, in order to evaluate the behavioral evolutionary interpretations made previously. Results from this study indicate that although some general evolutionary patterns can be discerned, they are not as straightforward as previously reported.Different topological categories of trace fossils represent organisms’ responses to evolutionary pressures in unique ways. While burrow widths of meandering traces were becoming smaller over time, as predicted by previous workers, the burrow widths of the network traces were becoming smaller only until the Late Cretaceous, when they started to get larger again. The times of significant evolutionary changes in behavior were not consistent among various topological categories, with some morphological features being affected in the Late Cretaceous and others during the beginning of the Eocene. It is likely that the behavioral evolution of graphoglyptids was influenced by deep-marine global influences linked to climate change, glaciation, and deep-ocean warming. These influences affected each topological group uniquely, suggesting that different species or genera of trace makers were creating each of the topological categories. This is contrary to the hypothesis that all graphoglyptids were created by closely related species.

PRELIMINARY LOOK AT TRACE FOSSILS IN THE LATE CRETACEOUS COLERAINE FORMATION; HILL ANNEX STATE PARK, CALUMET, MINNESOTA

2017 ◽  
Author(s):  
Jason J. Korf ◽  
◽  
John Westgaard ◽  
H. Douglas Hanks ◽  
Steve Willging
Keyword(s):  
Late Cretaceous ◽  
Trace Fossils

Geographic Variation in Behavior

1999 ◽  
Keyword(s):  
Geographic Variation ◽  
Animal Behavior ◽  
Evolutionary Biology ◽  
Behavioral Characteristics ◽  
Behavioral Differences ◽  
Methodological Issues ◽  
Behavioral Evolution ◽  
Evolutionary Patterns ◽  
Wide Range

Studies of animal behavior often assume that all members of a species exhibit the same behavior. Geographic Variation in Behavior shows that, on the contrary, there is substantional variation within species across a wide range of taxa. Including work from pioneers in the field, this volume provides a balanced overview of research on behavioral characteristics that vary geographically. The authors explore the mechanisms by which behavioral differences evolve and examine related methodological issues. Taken together, the work collected here demonstrates that genetically based geographic variation may be far more widespread than previously suspected. The book also shows how variation in behavior can illuminate both behavioral evolution and general evolutionary patterns. Unique among books on behavior in its emphasis on geographic variation, this volume is a valuable new resource for students and researchers in animal behavior and evolutionary biology.

Coping with longitudinal data in research on developmental psychopathology

2006 ◽  
Vol 30 (1) ◽  
pp. 20-25 ◽  
Author(s):  
David A. Cole
Keyword(s):  
Data Collection ◽  
Longitudinal Data ◽  
Developmental Psychopathology ◽  
Careful Consideration ◽  
Two Dimensions ◽  
The Other ◽  
Outcome Variable ◽  
The Third ◽  
Data Analytic ◽  
Over Time

Many outcome variables in developmental psychopathology research are highly stable over time. In conventional longitudinal data analytic approaches such as multiple regression, controlling for prior levels of the outcome variable often yields little (if any) reliable variance in the dependent variable for putative predictors to explain. Three strategies for coping with this problem are described. One involves focusing on developmental periods of transition, in which the outcome of interest may be less stable. A second is to give careful consideration to the amount of time allowed to elapse between waves of data collection. The third is to consider trait-state-occasion models that partition the outcome variable into two dimensions: one entirely stable and trait-like, the other less stable and subject to occasion-specific fluctuations.

Rethinking Hierarchies in East Asian Historical IR

2018 ◽  
Vol 4 (4) ◽  
pp. 598-611 ◽  
Author(s):  
Joseph MacKay
Keyword(s):  
International Relations ◽  
East Asia ◽  
East Asian ◽  
Two Dimensions ◽  
The Past ◽  
Dimensions Of Variation ◽  
Over Time

Abstract International relations (IR) has seen a proliferation of recent research on both international hierarchies as such and on historical IR in (often hierarchical) East Asia. This article takes stock of insights from East Asian hierarchies for the study of international hierarchy as such. I argue for and defend an explanatory approach emphasizing repertoires or toolkits of hierarchical super- and subordination. Historical hierarchies surrounding China took multiple dynastic forms. I emphasize two dimensions of variation. First, hierarchy-building occurs in dialogue between cores and peripheries. Variation in these relationships proliferated multiple arrangements for hierarchical influence and rule. Second, Sinocentric hierarchies varied widely over time, in ways that suggest learning. Successive Chinese dynasties both emulated the successes and avoided the pitfalls of the past, adapting their ideologies and strategies for rule to varying circumstances by recombining past political repertoires to build new ones. Taken together, these phenomena suggest new lines of inquiry for research on hierarchies in IR.

scholarly journals CHONDRITES-CLADICHNUS ICHNOCOENOSIS FROM THE DEEP-SEA DEPOSITS OF PIERFRANCESCO (CRETACEOUS; ITALY): OXYGEN- OR NUTRIENT-LIMITED?

2022 ◽  
Vol 128 (1) ◽  
Author(s):  
ANDREA BAUCON ◽  
GIROLAMO LO RUSSO ◽  
CARLOS NETO DE CARVALHO ◽  
FABRIZIO FELLETTI
Keyword(s):  
Late Cretaceous ◽  
Deep Sea ◽  
Trace Fossils ◽  
Northern Apennines ◽  
Trace Fossil ◽  
Ecological Succession ◽  
Rhythmic Pattern ◽  
Low Oxygen ◽  
Fossil Assemblage

The Italian Northern Apennines are acknowledged as the place where ichnology was born, but there is comparatively little work about their ichnological record. This study bridges this gap by describing two new ichnosites from the locality of Pierfrancesco, which preserve an abundant, low-disparity trace-fossil assemblage within the Late Cretaceous beds of the M. Cassio Flysch. Results show that lithofacies and ichnotaxa are rhythmically organized. The base of each cycle consists of Megagrapton-bearing calciclastic turbidites, which are overlain by marlstone beds with an abundant, low-disparity assemblage of trace fossils. This includes Chondrites intricatus, C. patulus, C. targionii, C. recurvus and Cladichnus fischeri. The cycle top consists of mudstones with no distinct burrows. The rhythmic pattern of Pierfrancesco reflects a deep-sea ecological succession, in which species and behaviour changed as turbidite-related disturbances altered the seafloor. This study opens the question of whether the Chondrites-Cladichnus ichnocoenosis represents low-oxygen or nutrient-poor settings.

scholarly journals KEPEMIMPINAN TRANSFORMASIONAL PROFETIK DALAM MENGEMBANGKAN PESANTREN DI KABUPATEN JEMBER

2018 ◽  
Vol 23 (1) ◽  
pp. 87
Author(s):  
Umiarso Umiarso
Keyword(s):  
Transformational Leadership ◽  
Two Dimensions ◽  
Institutional Transformation ◽  
Intellectual Stimulation ◽  
Integrative Education ◽  
Idealized Influence ◽  
Individual Consideration ◽  
The Times ◽  
The Mind ◽  
New Good

Abstract Pesantren (Islamic boarding schools) has been continuously aligning its educational system with the needs of society and the times. The development of pesantren is inseparable from the role of kiai in carrying out the institutional transformation. This study focuses on transformational leadership of the kiai in developing the pesantren institution. The results of this study indicate that the concept of developing pesantren is transcultural with the principle of "accepting a new good culture and preserving the old one that is still relevant", based on the vision and mission, directed at an integrative education system which combines the mind and heart traditions using rational domain and spirituality in order to achieve worldly (profanistic) and ukhrawi (sacralistic) goals; transformational leadership styles of a kiai include idealized influence behavior, inspirational inspiration, intellectual stimulation, individual consideration, and individual spiritual greatness; and the implications of transformational leadership include two dimensions, namely the human resources and institutional resources. Therefore, this leadership can be said to be prophetic transformational leadership with the addition of individual spiritual greatness (Five I'S). Keywords: Kiai, Transformational Leadership, and Pesantren   Abstrak: Pesantren secara kontinu menyelaraskan sistem kependidikannya dengan kebutuhan masyarakat serta perkembangan zaman. Pengembangan pesantren tidak terlepas dari peran kiai dalam melakukan transformasi kelembagaan. Penelitian ini memfokuskan pada kepemimpinan transformasional kiai dalam mengembangkan kelembagaan pesantren. Hasil penelitian ini menunjukkan bahwa konsep pengembangan pesantren bersifat transkultural dengan prinsip “menerima budaya baru yang baik dan melestarikan budaya lama yang masih relevan”, berpijak pada visi dan misi, diarahkan pada sistem pendidikan integratif yang memadukan antara tradisi akal dan hati menggunakan domain rasional dan spiritualitas untuk mencapai tujuan yang bersifat duniawi (profanistik) dan ukhrawi (sakralistik); gaya kepemimpinan transformasional kiai meliputi perilaku idealized influence, inspirational inspiration, intellectual stimulation, individual consideration, dan individual spiritual greatness; dan implikasi kepemimpinan transformasional meliputi dua dimensi, yaitu dimensi sumberdaya manusia dan kelembagaan. Karenanya, kepemimpinan ini dapat dikatakan kepemimpinan transformasional profetik dengan penambahan individual spiritual greatness (Five I’S). Kata Kunci: Kiai, Kepemimpinan Transformasional, dan Pesantren  

Abstract 2645: Longer Ventricular Fibrillation Detection Duration Does Not Increase Rate of Undersensing: Results from the PREPARE Study

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Stephen Moore ◽  
Richard Stern ◽  
Mark L Brown ◽  
Brooke M Heubner ◽  
Jim W Johnson
Keyword(s):  
Primary Prevention ◽  
Ventricular Fibrillation ◽  
Shock Delivery ◽  
Long Duration ◽  
Increase Rate ◽  
The Times ◽  
Over Time

Background: The PREPARE study was designed to evaluate ICD detection and therapy parameters strategically selected to safely reduce all-cause shocks in patients with primary prevention indications by treating only truly sustained fast VT/VF. Electrophysiologic properties have been shown to deteriorate during long-duration VF episodes. There was concern that electrogram deterioration might result in increased undersensing (US) and delayed detection of VF. In this analysis we compared the rate of US between episodes detected with shorter (number of intervals to detect (NID) =12/16) and longer (NID=30/40) detection settings to assess whether delayed detection times for VF increased the rate of US. Methods: All induced VT/VF episodes from PREPARE patients programmed to NID 12/16 or 30/40 and sensitivity 1.2 mV were included in the analysis. US was determined automatically from the stored episode record. The numbers of US and the times from onset through initial detection and from detection to shock were computed. The rates of US over time were compared between the shorter and longer NIDs using a GEE analysis with time as the offset. Results: Seven hundred fifty six VF inductions in 432 patients from the PREPARE study were included in the analysis. There were 319 VF inductions (180 pts) with NID 12/16 and 437 VF inductions (261 pts) with NID 30/40. The average time from VF onset to shock increased from 6.0 to 9.5 seconds with the longer VFNID with no evidence of an increase in the rate of US over time. Conclusion: The longer NID delayed shock delivery by an average of 3.5 seconds but did not result in an increased rate of undersensing.

States, Secessionist Movements, and the International Recognition Regime

2021 ◽  
pp. 11-29
Author(s):  
Ryan D. Griffiths
Keyword(s):  
Two Dimensions ◽  
Admission Process ◽  
Sovereign State ◽  
Legal Norms ◽  
Playing Field ◽  
Independence Movement ◽  
International Recognition ◽  
Rules And Principles ◽  
The Right ◽  
Over Time

This chapter maps out the strategic playing field to better understand the sovereignty game. It analyses the process by which an independence movement becomes a sovereign state and the rules that guide the behavior of secessionists. The chapter then defines states and secessionist movements, and outlines their relationship to one another. It examines the international recognition regime by defining it as the evolving body of international legal norms, rules, and principles that determine when an applicant nation has the right to withdraw from an existing state and become a recognized independent sovereign state. The chapter discusses how and why the regime works, how it evolves over time, and highlights the competing normative demands that sit at the heart of the regime. Using the literature on sovereignty and international law, as well as interviews with UN officials, the chapter specifies the admission process for becoming a recognized sovereign state, and the perceived pathways it creates. It further explains two dimensions of statehood that are important for the theoretical framework of the study. One dimension pertains to the inwardly focused function of the state and its ability to provide political order. The other dimension is outwardly focused and calls attention to recognition by other states.

Mapping with Monocular Vision in Two Dimensions

2010 ◽  
Vol 1 (4) ◽  
pp. 56-65 ◽  
Author(s):  
Nicolau Leal Werneck ◽  
Anna Helena Reali Costa
Keyword(s):  
Optical Axis ◽  
Two Dimensions ◽  
Obstacle Detection ◽  
Uniform Motion ◽  
Mapping Algorithms ◽  
Multiple Images ◽  
Line Segments ◽  
Straight Line ◽  
Camera Intrinsic Parameters ◽  
Over Time

This article presents the problem of building bi-dimensional maps of environments when the sensor available is a camera used to detect edges crossing a single line of pixels and motion is restricted to a straight line along the optical axis. The position over time must be provided or assumed. Mapping algorithms for these conditions can be built with the landmark parameters estimated from sets of matched detection from multiple images. This article shows how maps that are correctly up to scale can be built without knowledge of the camera intrinsic parameters or speed during uniform motion, and how performing an inverse parameterization of the image coordinates turns the mapping problem into the fitting of line segments to a group of points. The resulting technique is a simplified form of visual SLAM that can be better suited for applications such as obstacle detection in mobile robots.

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