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Articles 271 - 300 of 1029
Full-Text Articles in Evolution
A Literature Review Of Horn And Horn-Like Structures In Vertebrates To Correlate Placement To Function, Behavior, And Niche., J T. Cottingham
A Literature Review Of Horn And Horn-Like Structures In Vertebrates To Correlate Placement To Function, Behavior, And Niche., J T. 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.
Asian Elephant Rescue, Rehabilitation And Rewilding, Liv Baker, Rebecca Winkler
Asian Elephant Rescue, Rehabilitation And Rewilding, Liv Baker, Rebecca Winkler
Animal Sentience
Thailand has fewer than 10,000 elephants left. More of them are living in captivity to serve the tourist industry under grim conditions than are living free in what is left of their wild habitat. Conservation efforts need to be focused on all surviving members of the species, captive and free, but they need to take into account the inextricable entanglement of human and nonhuman animal lives in Thailand today. There is an opportunity for rescuing, rehabilitating and reintroducing captive elephants to the wild with the help of the traditional expertise of a mahout culture that has been elephant-keeping for centuries. …
Rewilding And Domestication: Clarifying Terminology, Catia Correia-Caeiro
Rewilding And Domestication: Clarifying Terminology, Catia Correia-Caeiro
Animal Sentience
Baker & Winkler (B&W) describe the state of Asian elephant conservation, raising unique issues, and proposing a direction based on rewilding. The long history and socio-biology of elephants and humans has some parallels with the domestication of dogs (and other species). However, markers of domestication seem absent from elephants. The proper use of terms such as “wild” and “domestic” is crucial in defining the best conservation strategies, and, more important, in attending to the welfare needs of individuals, which can differ between wild and domestic animals. B&W’s target article represents an important starting point for discussion around elephant conservation, but …
Innovation In Meat Production: A Problem And An Opportunity, Christopher J. Bryant
Innovation In Meat Production: A Problem And An Opportunity, Christopher J. Bryant
Animal Sentience
Innovation in meat production has enabled modern humans to inflict far greater harm on animals, the environment, and public health than was possible just a few decades ago. Wiebers & Feigin aptly express the urgency with which these issues must be addressed. Those advocating for animals on moral grounds face resistance from omnivores citing taste, price and convenience. Further innovation in meat production (plant-based and cultured meat) will enable us to preserve the experience of eating meat whilst phasing out the many problems caused by industrial animal farming.
Covid-19, Evolution, Brains And Psychology, Frederick Toates
Covid-19, Evolution, Brains And Psychology, Frederick Toates
Animal Sentience
Attention needs to be directed to the processes that control behavior in humans and the adaptive problems that they solved in our early evolutionary environment. The evolutionary mismatch between the current environment and the human brain can yield important insights into the problems that beset us in the context of environmental degradation and nonhuman animal welfare.
Re-Engage With The World For Global Health And Animal Welfare, Bradley J. Bergstrom
Re-Engage With The World For Global Health And Animal Welfare, Bradley J. Bergstrom
Animal Sentience
Wiebers & Feigin (2020) make a strong argument for measures that would limit future zoonoses, such as the COVID-19 pandemic, by closing live-animal markets, changing our habits of food consumption and production, and reducing habitat destruction. These would help human health, animal welfare, and conservation of at-risk wildlife all at the same time. China’s command-and-control government can accomplish some of these things by edict, but slower-to-act western democracies play a surprisingly large role in these global problems by the power of their consumerism, including the illicit wildlife trade. We citizens need to insist that our government use all of its …
Thinking Longer, Looking Deeper, Ronnie Z. Hawkins
Thinking Longer, Looking Deeper, Ronnie Z. Hawkins
Animal Sentience
We need to situate the present crisis within the larger context of what we humans have done to the nonhuman forms of life with which we evolved, taking a longer view of our own evolutionary origins and a deeper look at what might be a more appropriate role for our species to play within the Biosphere.
Bridging The Empathy Gap For Invertebrates, John M. Marzluff
Bridging The Empathy Gap For Invertebrates, John M. Marzluff
Animal Sentience
The actions of sentient vertebrates command our attention and inform our morality. Mikhalevich & Powell (2020) (M&P) argue that similar activities in a wide range of invertebrates with central nervous systems should do likewise. However, humans most readily empathize with creatures we recognize as similar in behavior, physiology, or appearance to ourselves. Helping humanity overcome this bias is a significant challenge for those who study invertebrates. Until this empathy gap is bridged, I believe few people and the policies they craft will afford invertebrates the moral standing that M&P argue they deserve. Therefore, I suggest those interested in raising appreciation …
Sentience In Evolutionary Context, Jon Mallatt, Todd E. Feinberg
Sentience In Evolutionary Context, Jon Mallatt, Todd E. Feinberg
Animal Sentience
We appreciate the goals of Mikhalevich & Powell (M&P) and largely agree with their conclusions but we differ on some of their definitions and terms. Affects (emotional feelings) should be part of sentience. Although the evidence presented for insect sentience is strong, we list some of the counterevidence that should be considered. Our own research supports M&P’s choice of arthropods, cephalopods, and vertebrates as the only sentient organisms with moral status.
Insect Sentience And The Rise Of A New Inclusive Ethics, David Baracchi, Luigi Baciadonna
Insect Sentience And The Rise Of A New Inclusive Ethics, David Baracchi, Luigi Baciadonna
Animal Sentience
Welfare protections for vertebrates are grounded in the belief that vertebrates are sentient and capable of feeling whereas invertebrates are not. We agree with Mikhalevich & Powell that the exclusion of small-brained invertebrates from bioethics is not warranted by the current state of the scientific evidence. The choice to promote protection for certain invertebrates should be based on the Animal Sentience Precautionary Principle (ASPP). This principle should not prevent us from conducting experimental research with non-human animals to advance knowledge. However, we believe that it is important to outline practical guidelines to manage the wellbeing of invertebrates, while accumulating further …
An Assessment Of Convergence In The Feeding Morphology Of Xiphactinus Audax And Megalops Atlanticus Using Landmark-Based Geometric Morphometrics, Edward Chase Shelburne
An Assessment Of Convergence In The Feeding Morphology Of Xiphactinus Audax And Megalops Atlanticus Using Landmark-Based Geometric Morphometrics, Edward Chase Shelburne
Master's Theses or Doctor of Nursing Practice
Convergence is an evolutionary phenomenon wherein distantly related organisms independently develop features or functional adaptations to overcome similar environmental constraints. Historically, convergence among organisms has been speculated or asserted with little rigorous or quantitative investigation. More recent advancements in systematics has allowed for the detection and study of convergence in a phylogenetic context, but this does little to elucidate convergent anatomical features in extinct taxa with poorly understood evolutionary histories. The purpose of this study is to investigate one potentially convergent system—the feeding structure of Xiphactinus audax (Teleostei: Ichthyodectiformes) and Megalops atlanticus (Teleostei: Elopiformes)—using a comparative anatomical approach to assess …
The Evolution Of Dragons, Laura J. Mayfield
The Evolution Of Dragons, Laura J. Mayfield
Undergraduate Theses, Professional Papers, and Capstone Artifacts
Dragons have been depicted in human art as early as 4500 BCE. For centuries, these fantasy creatures have inspired countless folk and fantasy tales, as well as appearing in the art of different cultures around the world. Now there are thousands of different depictions of these huge, flying, fire-breathing lizards, but are any of them possible? In this study, I reference peer-reviewed scientific articles, phylogenetic analysis, and paleoart studies to create biologically-sound dragons. Basing the dragon lineage on a real branch of webbed-winged scansoriopterygids—an extinct family of climbing and gliding maniraptoran dinosaurs—I explored the possible wing-structure, fire-breathing abilities, and effects …
Extreme Offspring Ornamentation In American Coots Is Favored By Selection Within Families, Not Benefits To Conspecific Brood Parasites, Bruce E. Lyon, Daizaburo Shizuka
Extreme Offspring Ornamentation In American Coots Is Favored By Selection Within Families, Not Benefits To Conspecific Brood Parasites, Bruce E. Lyon, Daizaburo Shizuka
School of Biological Sciences: Faculty Publications
Offspring ornamentation typically occurs in taxa with parental care, suggesting that selection arising from social interactions between parents and offspring may underlie signal evolution. American coot babies are among the most ornamented offspring found in nature, sporting vividly orange-red natal plumage, a bright red beak, and other red parts around the face and pate. Previous plumage manipulation experiments showed that ornamented plumage is favored by strong parental choice for chicks with more extreme ornamentation but left unresolved the question as to why parents show the preference. Here we explore natural patterns of variation in coot chick plumage color, both within …
Spatial And Temporal Genetic Structure Of Winter-Run Steelhead (Oncorhynchus Mykiss) Returning To The Mad River, California, Steven R. Fong
Spatial And Temporal Genetic Structure Of Winter-Run Steelhead (Oncorhynchus Mykiss) Returning To The Mad River, California, Steven R. Fong
Cal Poly Humboldt theses and projects
Distinct populations of steelhead in the wild are in decline. The propagation of steelhead in hatcheries has been used to boost population numbers for recreational fisheries and for use in conservation. However, hatchery breeding practices of steelhead can result in changes in genetic structure. I investigated the genetic structure of winter-run steelhead (Oncorhynchus mykiss) returning to the Mad River, California, where a hatchery has been used enhance production for recreational fisheries since 1971. Genetic variability in Mad River steelhead was evaluated using 96 single nucleotide polymorphisms (SNPs) among 4203 individuals, including the Mad River and nearby locations, and …
Problems With Basing Insect Ethics On Individuals’ Welfare, Susana Monsó, Antonio J. Osuna-Mascaró
Problems With Basing Insect Ethics On Individuals’ Welfare, Susana Monsó, Antonio J. Osuna-Mascaró
Animal Sentience
In their target article, Mikhalevich & Powell (M&P) argue that we should extend moral protection to arthropods. In this commentary, we show that there are some unforeseen obstacles to applying the sort of individualistic welfare-based ethics that M&P have in mind to certain arthropods, namely, insects. These obstacles have to do with the fact that there are often many more individuals involved in our dealings with insects than our ethical theories anticipate, and also with the fact that, in some sense, some insects count as more than an individual and, in another sense, they sometimes count as less than an …
Ecological And Evolutionary Dynamics Of Elephant Rewilding, Lysanne Snijders
Ecological And Evolutionary Dynamics Of Elephant Rewilding, Lysanne Snijders
Animal Sentience
Baker & Winkler make a thought-provoking contribution to the discussion of what role captive animals could play in nature conservation and how we could get there through rewilding. There certainly is potential for captive Asian elephants, Elephas maximus, to become targets of conservation efforts, but there are also many questions: (1) How much do (behavioral) traits of captive-origin animals differ from their free conspecifics? (2) What predicts the likelihood and strength of social reintegration of captive animals into free populations? (3) How much of an Asian elephant’s functional role in the environment can captive animals still fulfill and how …
Innovative, Yes: But Is It Rewilding?, Daniel T. Blumstein, Kate E. Lynch
Innovative, Yes: But Is It Rewilding?, Daniel T. Blumstein, Kate E. Lynch
Animal Sentience
Baker & Winkler’s extremely stimulating proposal clearly illustrates conflicting priorities in biodiversity conservation and management that are exacerbated when human cultural resources and animal welfare are a part of the solution. We suggest that the discussion can benefit from an even more explicit unpacking of the conflicting values associated with the proposal.
Rewilding And Mixed-Community Collaboration In Conservation, Liv Baker
Rewilding And Mixed-Community Collaboration In Conservation, Liv Baker
Animal Sentience
Rewilding is a psychological and sociocultural event for nonhuman animals that goes beyond the traditional framework of ecology. Elephants need to be seen as political agents in a collaboration. Our commentators shed light on the hierarchical assumptions and politics involved. Mixed-community collaboration can create dynamic and sustainable conservation interventions that are crucial to reconceptualizing the human-elephant relationship beyond the concept of labor. The profound effects of the Covid-19 pandemic have laid bare the fundamental vulnerabilities of the elephant tourism industry. Moreover, how well an elephant has been buffered by the fallout of the pandemic is dependent on the specific relations …
Exploring Eight-Armed Intelligence Through Film, Tierney M. Thys
Exploring Eight-Armed Intelligence Through Film, Tierney M. Thys
Animal Sentience
Mather (2019) provides a rich overview of the elements underlying octopus cognition and behavioral flexibility. Recently, two remarkable natural history films, My Octopus Teacher and The Octopus in My House have explored intimate human-octopus relationships with a wild (Octopus vulgaris) and a captive octopus (Octopus cyanea) respectively. Both films show rare behaviors that offer observations to test new hypotheses as well as a novel perspective on our own human relationships and place within the natural world. An interview with filmmaker Craig Foster from My Octopus Teacher reveals the profound and transformative power of forming a trusting …
Comparative Cognition And Nonhuman Individuality, Catia Correia Caeiro
Comparative Cognition And Nonhuman Individuality, Catia Correia Caeiro
Animal Sentience
Commentators Washington (2019) and Tiffin (2019) point out that the individual vs. collective dichotomy is much more complex than what is considered in the target article. This commentary will focus on why individuals are more important than collectives. Species differences in cognition and emotional processes and individuals’ feelings and experiences need to be taken into account.
Conventional Science Will Not Do Justice To Nonhuman Interests: A Fresh Approach Is Required, Becca Franks, Christine Webb, Monica Gagliano, Barbara Smuts
Conventional Science Will Not Do Justice To Nonhuman Interests: A Fresh Approach Is Required, Becca Franks, Christine Webb, Monica Gagliano, Barbara Smuts
Animal Sentience
Treves et al. (2019) make a convincing case that conservation efforts need to go beyond an anthropocentric worldview. Implementing that vision, however, will require human advocates to represent nonhuman interests. Where will the knowledge of those interests come from? How can humans know what is in the best interest of another animal, a plant, or an ecosystem? We discuss how the values embedded in current scientific practices may be ill-suited to representing nonhuman interests and we offer some ideas for correcting these shortcomings.
Preserving Nature For The Benefit Of All Sentient Individuals, Eze Paez
Preserving Nature For The Benefit Of All Sentient Individuals, Eze Paez
Animal Sentience
I agree with Treves et al.’s proposal for a preservation ethics based on the principle that nonhuman well-being is a matter of justice and compassion. In this commentary, I advance two objections. First, only sentient beings, rather than all life, belong in the moral community. Second, given that nature is probably harmful overall for sentient individuals, preserving it for the benefit of future human and nonhuman generations requires us to modify it as far as practicable.
The Wholeness Of Nature, Marthe Kiley-Worthington
The Wholeness Of Nature, Marthe Kiley-Worthington
Animal Sentience
The target article outlines various positions on conservation and preservation but ignores practical considerations of management since there is no wild habitat left. Population controls, either human or nonhuman mammals, are not discussed. The suggestions for legal changes are vague and will require much more thinking about how to integrate animal welfare with wildlife conservation concerns. “Freedoms” as outlined in the human bill of rights might help with decision making for improving animal welfare. Other commentators have made anthropocentric judgements concerning animal welfare, ignoring the importance of developing other ways of seeing and understanding the “multiplicity within unity,” combining empirical …
Conflicts And Triage, Kate E. Lynch, Daniel T. Blumstein
Conflicts And Triage, Kate E. Lynch, Daniel T. Blumstein
Animal Sentience
To represent diverse interests successfully, a strategy for dealing with conflicts is needed. We discuss an approach to maximizing the interests of the greatest number of individuals, present and future.
Just Preservation, Trusteeship And Multispecies Justice, Francisco J. Santiago-Ávila, Adrian Treves, William Lynn
Just Preservation, Trusteeship And Multispecies Justice, Francisco J. Santiago-Ávila, Adrian Treves, William Lynn
Animal Sentience
We are grateful to all the commentators who engaged with our target article. Some commentators have offered important insights into our proposed design and methods for legally intervening on behalf of futurity. Others have focused on theoretical considerations central to our proposal for multispecies justice and trusteeship. All have inspired modifications and further elaboration of our initial proposal. In this Response, we engage with the commentaries, integrating their suggestions, striving for convergence and complementarity, but also discussing points of divergence with our proposed framework where necessary. There is substantial overlap in the points of view of the three co-authors, but …
No Room For Speciesism In Welfare Considerations, Jennifer Vonk
No Room For Speciesism In Welfare Considerations, Jennifer Vonk
Animal Sentience
Speciesism should play no role in determining welfare outcomes. Cognition may vary within species as well as between species, but broad classifications such as invertebrates are functionally meaningless in this context. Cognition should relate to welfare only to the extent that it relates to the capacity to suffer or to experience pleasure.
Invertebrates Should Be Given Ethical Consideration, Marie-Claire Cammaerts
Invertebrates Should Be Given Ethical Consideration, Marie-Claire Cammaerts
Animal Sentience
Invertebrates are far more numerous than vertebrates. Most of them are essential to the survival of humanity. Their physiology, behavior, know-how, and cognitive abilities are often as complex as those of vertebrates. Invertebrates should be considered and studied as are vertebrates, i.e., ethically, and cautiously.
Lessons From Miniature Brains: Cognition Cheap, Memory Expensive (Sentience Linked To Active Movement?), Giorgio Vallortigara
Lessons From Miniature Brains: Cognition Cheap, Memory Expensive (Sentience Linked To Active Movement?), Giorgio Vallortigara
Animal Sentience
Studies on invertebrate minds suggest that the neural machinery for basic cognition is cheap, and that bigger brains are probably associated with greater memory storage rather than more advanced cognition. Sentience may be linked to feedforward mechanisms (Reafferenzprinzip) that allow organisms with active movement to distinguish active and passive sensing. Invertebrates may offer special opportunities for testing these hypotheses.
Ethical Considerations For Invertebrates, Scarlett R. Howard, Matthew R.E. Symonds
Ethical Considerations For Invertebrates, Scarlett R. Howard, Matthew R.E. Symonds
Animal Sentience
Mikhalevich & Powell (2020) have built on the discussion about which species deserve inclusion in animal ethics and welfare considerations. Here, we raise questions concerning the assessment criteria. We ask how to assess different species for their ability to fulfill the criteria, which criteria are most important, how we quantify them (absolute or on a continuum), and how non-animals such as fungi and plants fit into this paradigm.
The Evolution And Development Of Chiropteran Flight, Emmaline Willis
The Evolution And Development Of Chiropteran Flight, Emmaline Willis
Honors Theses and Capstones
No abstract provided.