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Full-Text Articles in Life Sciences

Mother Convict Cichlids Inflict More Bites Upon An Intruder In Hot Temperatures, Jesse L. Heckendorf Aug 2014

Mother Convict Cichlids Inflict More Bites Upon An Intruder In Hot Temperatures, Jesse L. Heckendorf

STAR (STEM Teacher and Researcher) Presentations

Convict cichlids (Archocentrus nigrofasciatus) have developed to be extremely good parents by protecting their brood. Parental care leads to aggressive biting, chasing, and gill flaring to intimidate known predators. In this experiment, we show that environmental factors, such as the changing of temperature in this case, affect a female convict cichlid’s aggression toward caring for her offspring when an intruder is introduced. Females attack more in warmer water.


The Socioecology Of Monk Parakeets: Insights Into Parrot Social Complexity, Elizabeth A. Hobson, Michael L. Avery, Timonthy F. Wright Jan 2014

The Socioecology Of Monk Parakeets: Insights Into Parrot Social Complexity, Elizabeth A. Hobson, Michael L. Avery, Timonthy F. Wright

USDA National Wildlife Research Center - Staff Publications

In many species, individuals benefit from social associations, but they must balance these benefits with the costs of competition for resources. Understanding how these competing factors generate diversity in social systems is a major goal of behavioral ecology, but one that has been hampered by a lack of basic data quantifying many aspects of social structure and associations. Although parrots are generally assumed to have complex social groups, few studies have quantitatively examined these assumptions about parrot social structure. We critically assessed 4 assumptions about parrot socioecology using data from captive and wild groups of Monk Parakeets (Myiopsitta monachus). We ...


Shared Genes Related To Aggression, Rather Than Chemical Communication, Are Associated With Reproductive Dominance In Paper Wasps (Polistes Metricus), Amy L. Toth, John F. Tooker, Srihari Radhakrishnan, Robert Minard, Michael T. Henshaw, Christina M. Grozinger Jan 2014

Shared Genes Related To Aggression, Rather Than Chemical Communication, Are Associated With Reproductive Dominance In Paper Wasps (Polistes Metricus), Amy L. Toth, John F. Tooker, Srihari Radhakrishnan, Robert Minard, Michael T. Henshaw, Christina M. Grozinger

Ecology, Evolution and Organismal Biology Publications

Background
In social groups, dominant individuals may socially inhibit reproduction of subordinates using aggressive interactions or, in the case of highly eusocial insects, pheromonal communication. It has been hypothesized these two modes of reproductive inhibition utilize conserved pathways. Here, we use a comparative framework to investigate the chemical and genomic underpinnings of reproductive dominance in the primitively eusocial wasp Polistes metricus. Our goals were to first characterize transcriptomic and chemical correlates of reproductive dominance and second, to test whether dominance-associated mechanisms in paper wasps overlapped with aggression or pheromone-related gene expression patterns in other species. To explore whether conserved molecular ...


Lower Amygdala Volume In Men Is Associated With Childhood Aggression, Early Psychopathic Traits, And Future Violence, Dustin A. Pardini, Adrian Raine, Kirk Erickson, Rolf Loeber Jan 2014

Lower Amygdala Volume In Men Is Associated With Childhood Aggression, Early Psychopathic Traits, And Future Violence, Dustin A. Pardini, Adrian Raine, Kirk Erickson, Rolf Loeber

Neuroethics Publications

Background

Reduced amygdala volume has been implicated in the development of severe and persistent aggression and the development of psychopathic personality. With longitudinal data, the current study examined whether male subjects with lower amygdala volume have a history of aggression and psychopathic features dating back to childhood and are at increased risk for engaging in future aggression/violence.

Methods

Participants were selected from a longitudinal study of 503 male subjects initially recruited when they were in the first grade in 1986–1987. At age 26, a subsample of 56 men with varying histories of violence was recruited for a neuroimaging ...