A Literature Review Of Horn And Horn-Like Structures In Vertebrates To Correlate Placement To Function, Behavior, And Niche.,
Johnson County Community College
A Literature Review Of Horn And Horn-Like Structures In Vertebrates To Correlate Placement To Function, Behavior, And Niche., J Cottingham
Biology Papers and Presentations
In this paper, the true horns of bovids are compared to the many horn-like structures found throughout the animal kingdom. Literary sources were reviewed for a variety of horn-like structures. The review was limited to extinct and extant terrestrial vertebrates. 3D models of these organisms' skulls and “horns” were created or acquired and 3D printed at the same scale to illustrate their differences and similarities and to analysis of their comparative size easier between large and small genera.
The Dorsal Lip Of The Blastopore Is An Organizer,
University of the Pacific
The Dorsal Lip Of The Blastopore Is An Organizer, Ajna Rivera
Pacific Open Images
The Spemann-Mangold experiment: Transplantation of the dorsal lip of the blastopore from a donor to a host of a closely related species gave a second body axis. Most of this second body is made of host tissue. The donor tissue primarily forms the notochord.
Answers To Common Misconceptions About Biological Evolution,
University of Nebraska - Lincoln
Answers To Common Misconceptions About Biological Evolution, Robert Zink
Papers in Evolution
“When you have an established scientific emergent truth, it is true whether or not you believe in it.” Neil deGrasse Tyson, Science in America. Very few people outside of a particular scientific discipline can actually say they understand it, because most do not have the training to “speak the language.” They are then not particularly bothered by its tenets and predictions. Of all the major branches of science, however, evolutionary biology is an exception to this generalization because even though people are not versed in the field, they sometimes have a negative, knee-jerk objection. This objection is often because they …
Can Nonhuman Animals Commit Suicide?,
WellBeing International
Can Nonhuman Animals Commit Suicide?, David Peña-Guzmán
Animal Sentience: An Interdisciplinary Journal on Animal Feeling
Many people believe that only humans have the cognitive and behavioral capacities needed for suicidal behavior, such as reflexive subjectivity, free will, intentionality, or awareness of death. Three counterarguments — based on (i) negative emotions and psychopathologies among nonhuman animals, (ii) the nature of self-destructive behavior, and (iii) the problem of model fidelity in suicide research — suggest that self-destructive and self-injurious behaviors among human and nonhuman animals vary along a continuum.
Ethical Theories And Perspectives On End-Of-Life Decisions,
Abilene Christian University
Ethical Theories And Perspectives On End-Of-Life Decisions, Lauren Skelton
Dialogue & Nexus
This paper approaches several different ethical theories to see how they interact with the issue of withdrawing and withholding life-sustaining care. After the theories of Utilitarianism, Kantian and Prima Facie Deontology, Virtue Ethics, and Evolutionary Ethics are explored at length, Deontological theories are proven to be the best decision-making guide from the perspective of both patients and those in policy-making positions. When used together, Kantian and Prima Facie Deontology offer the overall best combination of ethical instruction and personal freedom.
Euryhalinity In An Evolutionary Context,
University of Connecticut
Euryhalinity In An Evolutionary Context, Stephen Mccormick, Eric Schultz
EEB Articles
This chapter focuses on the evolutionary importance and taxonomic distribution of euryhalinity. Euryhalinity refers to broad halotolerance and broad halohabitat distribution. Salinity exposure experiments have demonstrated that species vary tenfold in their range of tolerable salinity levels, primarily because of differences in upper limits. Halotolerance breadth varies with the species’ evolutionary history, as represented by its ordinal classification, and with the species’ halohabitat. Freshwater and seawater species tolerate brackish water; their empirically-determined fundamental haloniche is broader than their realized haloniche, as revealed by the halohabitats they occupy. With respect to halohabitat distribution, a minority of species (<10%) are euryhaline. Habitat-euryhalinity is prevalent among basal actinopterygian fishes, is largely absent from orders arising from intermediate nodes, and reappears in the most derived taxa. There is pronounced family-level variability in the tendency to be halohabitat-euryhaline, which may have arisen during a burst of diversification following the Cretaceous-Palaeogene extinction. Low prevalence notwithstanding, euryhaline species are potent sources of evolutionary diversity. Euryhalinity is regarded as a key innovation trait whose evolution enables exploitation of new adaptive zone, triggering cladogenesis. We review phylogenetically-informed studies that demonstrate freshwater species diversifying from euryhaline ancestors through processes such as landlocking. These studies indicate that some euryhaline taxa are particularly susceptible to changes in halohabitat and subsequent diversification, and some geographic regions have been hotspots for transitions to freshwater. Comparative studies on mechanisms among multiple taxa and at multiple levels of biological integration are needed to clarify evolutionary pathways to, and from, euryhalinity.
Intelligence, Complexity, And Individuality In Sheep,
WellBeing International
Intelligence, Complexity, And Individuality In Sheep, Lori Marino, Debra Merskin
Animal Sentience
Domestic sheep (Ovis aries) are among the earliest animals domesticated for human use. They are consumed worldwide as mutton, hogget, and lamb, kept as wool and milk producers, and used extensively in scientific research. The popular stereotype is that sheep are docile, passive, unintelligent, and timid, but a review of the research on their behavior, affect, cognition, and personality reveals that they are complex, individualistic, and social.
Canine Emotions And The Bond Between Humans And Dogs,
WellBeing International
Canine Emotions And The Bond Between Humans And Dogs, Robert Franklin
Animal Sentience: An Interdisciplinary Journal on Animal Feeling
I explore how the findings reviewed by Kujala (2017) influence our understanding of the human-dog bond. The special social cognitive abilities of dogs may be unique among animal species, probably influenced by the circumstances surrounding canine domestication. The bond has influenced animal welfare policies, giving dogs a privileged place among animals. To determine what protections other species should have in a rational animal welfare policy, more research is needed on whether other species have similar social cognitive abilities.
Egyptian Body Size: A Regional And Worldwide Comparison,
University of South Florida
Egyptian Body Size: A Regional And Worldwide Comparison, Michelle Raxter
Graduate School Theses and Dissertations
Human body size and limb proportions can provide important information about adaptation, population movements, and health disparities. This study investigated changes in body size and limb proportions of adult Egyptians temporally and geographically in relation to climatological, sociopolitical and economic developments. It was predicted that Egyptian groups that experienced more environmental stress would be shorter and exhibit less sexual dimorphism. It was also predicted that Egyptians would be intermediate between higher and lower latitude populations in body form and limb length ratios. The main skeletal sample consisted of 492 males and 528 females, all adults from the Predynastic and Dynastic …
Alu Dimorphism At The Pv92 Locus Of Chromosome 16 Is In Equilibrium For University Student Population,
University of South Carolina
Alu Dimorphism At The Pv92 Locus Of Chromosome 16 Is In Equilibrium For University Student Population, James Brooks
Journal of the South Carolina Academy of Science
Alu is a retrotransposable element, which refers to its ability to be copied and move from one region of DNA to another DNA region. At the PV92 locus of chromosome 16, Alu is a 300 bp dimorphic insert that can either be present or absent. It does not encode a protein product and has lost the ability to transpose. It is specific to humans, and differences in genotype and allele frequencies between human populations are important tools in understanding evolution. In this research, data was obtained and analyzed from 269 students at Charleston Southern University (CSU) belonging to four different …
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