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Early life differences in behavioral predispositions in two Alligatoridae species.

ABSTRACT: Behavioral predispositions are innate tendencies of animals to behave in a given way without the input of learning. They increase survival chances and, due to environmental and ecological challenges, may vary substantially even between closely related taxa. These differences are likely to be especially pronounced in long-lived species like crocodilians. This order is particularly relevant for comparative cognition due to its phylogenetic proximity to birds. Here we compared early life behavioral predispositions in two Alligatoridae species. We exposed American alligator and spectacled caiman hatchlings to three different novel situations: a novel object, a novel environment that was open and a novel environment with a shelter. This was then repeated a week later. During exposure to the novel environments, alligators moved around more and explored a larger range of the arena than the caimans. When exposed to the novel object, the alligators reduced the mean distance to the novel object in the second phase, while the caimans further increased it, indicating diametrically opposite ontogenetic development in behavioral predispositions. Although all crocodilian hatchlings face comparable challenges, e.g., high predation pressure, the effectiveness of parental protection might explain the observed pattern. American alligators are apex predators capable of protecting their offspring against most dangers, whereas adult spectacled caimans are frequently predated themselves. Their distancing behavior might be related to increased predator avoidance and also explain the success of invasive spectacled caimans in the natural habitats of other crocodilians.

SUBMITTER: Reber SA

PROVIDER: S-EPMC8238711 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Behavioral differences at scent stations between two exploited species of desert canids.

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Early-life prefrontal cortex inhibition and early-life stress lead to long-lasting behavioral, transcriptional, and physiological impairments

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2024-03-14 | GSE254342 | GEO

Specific olfactory neurons and glomeruli are associated to differences in behavioral responses to pheromone components between two Helicoverpa species.

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Behavioral problems after early life stress: contributions of the hippocampus and amygdala.

Project description:Early life stress (ELS) can compromise development, with higher amounts of adversity linked to behavioral problems. To understand this linkage, a growing body of research has examined two brain regions involved with socioemotional functioning-amygdala and hippocampus. Yet empirical studies have reported increases, decreases, and no differences within human and nonhuman animal samples exposed to different forms of ELS. This divergence in findings may stem from methodological factors, nonlinear effects of ELS, or both.We completed rigorous hand-tracing of the amygdala and hippocampus in three samples of children who experienced different forms of ELS (i.e., physical abuse, early neglect, or low socioeconomic status). Interviews were also conducted with children and their parents or guardians to collect data about cumulative life stress. The same data were also collected in a fourth sample of comparison children who had not experienced any of these forms of ELS.Smaller amygdala volumes were found for children exposed to these different forms of ELS. Smaller hippocampal volumes were also noted for children who were physically abused or from low socioeconomic status households. Smaller amygdala and hippocampal volumes were also associated with greater cumulative stress exposure and behavioral problems. Hippocampal volumes partially mediated the relationship between ELS and greater behavioral problems.This study suggests ELS may shape the development of brain areas involved with emotion processing and regulation in similar ways. Differences in the amygdala and hippocampus may be a shared diathesis for later negative outcomes related to ELS.

| S-EPMC4241384 | biostudies-literature

Maternal behavioral health symptom profiles in early family life: complexity and context.

Project description:Behavioral health problems affect at least 15% of mothers, but few studies have examined how different problems cluster together. Characterizing symptom profiles and their correlates early in the family life cycle can extend existing understanding beyond that provided by studies based on single problems. Mothers in the Fragile Families and Child Wellbeing study, a national birth cohort of racially diverse and mostly unmarried mothers (N = 4205), reported depression, anxiety, and substance dependence symptoms. Latent class analysis (LCA) identified mothers' symptom profiles in their children's third year. We explored associations between symptom profiles and demographics, reproductive health outcomes, functional limitations, and postpartum behavioral health. LCA identified five profiles: (1) Depression only (14.5% of sample), (2) Severe depression and anxiety (5.3%), (3) Anxiety only (2.2%), (4) Depression and substance use (1.4%), and (5) Currently symptom free (76.6%). Depressive symptoms were more moderate when co-occurring with substance dependence and more severe when co-occurring with anxiety. Postpartum depression, postpartum anxiety, and smoking during pregnancy were the most robust correlates of being symptomatic in year 3. Mothers in the "Severe depression and anxiety" group were more likely to be in that profile if they reported functional impairment and/or relationship dissolution. Mothers in the "Depression only" profile were more likely to have higher parity and/or functional impairment. A quarter of mothers of young children had significant behavioral health symptoms, with most reporting depression symptoms. Psychosocial and physical health factors in the pregnancy and postpartum periods were associated with future symptoms, warranting obstetrician and pediatrician attention.

| S-EPMC7263010 | biostudies-literature

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