Communicative Behaviors, Hormone-Behavior Interactions, and Reproduction in Vertebrates

Wingfield, John C.

doi:10.1016/b978-012515400-0/50041-5

Cited by 19 publications

(36 citation statements)

References 331 publications

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“…Further discussion of ontogenetic stages is beyond the scope of this paper (see Wingfield 2004Wingfield , 2006.…”

Section: Life-history Stagesmentioning

confidence: 99%

“…sexual and/or parental behaviour), and may be repeated if environmental variation allows. The termination phase follows as the next life-history stage develops (from Wingfield 2004Wingfield , 2006. This overlap of developmental phase of one lifehistory stage and the termination of another results in 'superstates', which may be energetically costly Jacobs & Wingfield 2000) but usually are short lived (days to a few weeks).…”

Section: How Do We Define Life-history Stages?mentioning

confidence: 99%

“…figure 4c with six stages in migratory birds) means that flexibility in timing may be even lower. Others, such as coral reef fishes (figure 4b), have greatest flexibility, but their tolerance of environmental variation is low (after Ramenofsky & Wingfield 2006;Wingfield 2006).…”

Section: How Do We Define Life-history Stages?mentioning

confidence: 99%

“…Intermediate numbers of life-history stages (e.g. for a lizard or snake, figure 3) provide flexibility in timing of life-history stages, as well as tolerance of variation in annual environmental conditions (from Wingfield 2004Wingfield , 2006. By arranging adult life-history stages according to time of year, it becomes clear that the developmental phase of a life-history stage must overlap the termination phase of the previous stage (see also figure 7), and that the more life-history stages expressed (e.g.…”

Section: How Do We Define Life-history Stages?mentioning

confidence: 99%

“…sexual to parental behaviour sub-stages when breeding). Modified from Wingfield (2006) The machine has a finite number of inputs (excitation variables) and outputs (response variables). Whether the intermediate variables that represent mechanisms at cell and molecular levels that determine the actual state at any point in the life cycle are also finite remains to de determined.…”

Section: The Finite State Machine Modelmentioning

confidence: 99%

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Organization of vertebrate annual cycles: implications for control mechanisms

Wingfield

2007

Phil. Trans. R. Soc. B

215

199

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The majority of vertebrates have a life span of greater than one year. Therefore individuals must be able to adapt to the annual cycle of changing conditions by adjusting morphology, physiology and behaviour. Phenotypic flexibility, in which an individual switches from one life history stage to another, is one way to maximize fitness in a changing environment. When environmental variation is low, few life history stages are needed. If environmental variation is large, there are more life history stages. Each life history stage has a characteristic set of sub-stages that can be expressed in various combinations and patterns to determine state at any point in the life of the individual. Thus individuals have a finite number of states that can be expressed over the spectrum of environmental conditions in their life spans. Life history stages have three phases-development, mature capability (when characteristic sub-stages can be expressed) and termination. Expression of a stage is time dependent (probably a minimum of one month), and termination of one stage overlaps development of the next stage. It follows that the more life history stages an individual expresses, the less flexibility it will have in timing those stages. Having fewer life history stages increases flexibility in timing, but less tolerance of variation in environmental conditions. To varying degrees it is possible to overlap mature capability of some life history stages to effectively reduce 'finite stage diversity' and maximize flexibility in timing. Theoretical ways by which this can be done, and the implications for neuroendocrine and endocrine control mechanisms are discussed. Twelve testable hypotheses are posed that relate directly to control mechanisms.

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“…Further discussion of ontogenetic stages is beyond the scope of this paper (see Wingfield 2004Wingfield , 2006.…”

Section: Life-history Stagesmentioning

confidence: 99%

Section: How Do We Define Life-history Stages?mentioning

confidence: 99%

Section: How Do We Define Life-history Stages?mentioning

confidence: 99%

Section: How Do We Define Life-history Stages?mentioning

confidence: 99%

Section: The Finite State Machine Modelmentioning

confidence: 99%

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Organization of vertebrate annual cycles: implications for control mechanisms

Wingfield

2007

Phil. Trans. R. Soc. B

215

199

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Chronic passive exposure to aggression escalates aggressiveness of rat observers

Sano

Lucas

2009

Aggressive Behavior

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Previous studies have documented that exposure to aggression increases aggressiveness of human witnesses. However, the question of whether passive exposure to aggression can exclusively cause a risk of aggressive inclination for observers through a learning process, rather than mimicry effect, has not been readily addressed in the clinical literature. This study aimed to investigate this question by using a simple animal model to test the behavioral effect of chronic passive exposure to aggression. Our results indicate that observer rats that had been passively exposed to aggression for 10 min per day for 23 consecutive days exhibited more aggressive behavior than controls or those groups undergoing a single exposure to passive aggression. Furthermore, aggression levels in the group of 23-day chronic exposure to aggression lasted 16 days after the recovery from exposure to aggression. These data suggest that the development of aggression in this model occurred through a learning process because only chronic exposure to aggression resulted in this behavioral outcome in the long run.

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Social competition masculinizes the communication signals of female electric fish

Gavasa

Silva

González

et al. 2012

Behav Ecol Sociobiol

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Male intrasexual competition and female choice explain the evolution of male ornaments. Except in sex-rolereversed taxa, female ornaments have been regarded as an epiphenomenon of genetic correlation, with no femalespecific function or independently selected basis. Females from species with conventional sex roles may still experience some degree of female-female competition and male choice that could explain the persistence of female ornaments. We studied the effect of female competition on the expression of a sexually dimorphic communication signal. In the electric fish Brachyhypopomus gauderio, both sexes produce an electric signal pulse for communication and electrolocation. Male electric pulses are longer in duration and greater in amplitude than those of females. As competition increases, males further enhance their signals in response to elevated androgen levels. We explored whether females respond to social competition as males do, by enhancing their communication signals and increasing androgen levels. We measured amplitude and duration of the electric signal pulse, and testosterone levels in female B. gauderio in their natural habitat in Uruguay and estimated social competition by calculating population density and adult sex ratio (ASR). In the lab, we manipulated ASR and population density independently to separate these factors and eliminate seasonal confounds. Under both field and lab conditions, signal pulse amplitude increased with population density, while pulse duration increased with female bias in ASR. In the field, but not the lab, androgen levels increased when ASR was female biased. Our findings indicate that the socially mediated mechanism of signal regulation is shared by the sexes, although whether androgens regulate this signal plasticity in females remains unclear.

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Communicative Behaviors, Hormone-Behavior Interactions, and Reproduction in Vertebrates

Cited by 19 publications

References 331 publications

Organization of vertebrate annual cycles: implications for control mechanisms

Organization of vertebrate annual cycles: implications for control mechanisms

Chronic passive exposure to aggression escalates aggressiveness of rat observers

Social competition masculinizes the communication signals of female electric fish

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