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PubMed2006

The busy shall inherit the earth: the evolution from 'hard work' to 'busyness' in modern science and society.

Although 'hard work' and 'busyness' are somewhat similar terms, there seem to be significant differences in the way that they are used. While hard work has always been a feature of complex societies, modern society can be seen as evolving toward being dominated by jobs characterized by busyness. Busyness refers to multi-tasking - having many sequential jobs to perform and switching frequently between them on an externally-imposed schedule. Traditionally, the individual gifts of a successful scientist were mainly in terms of knowledge, theoretical or technical aptitude. But nowadays the successful scientist is often one who has been promoted from hard-work to busyness: an expert in synthesizing a sufficient degree of scientific ability with a broad range of managerial and political skills. It is psychologically tough to be busy, because busyness is a consequence of human beings being constrained by the functioning of abstract social systems. In a complex modern organization, individual psychology is subordinated to inflexible programs of being in specific places at specific times doing specific things - this is both tricky to do well and demanding to do at all. Since people are paid (mainly) to do difficult but necessary things they would prefer not to do, busyness has become a major reason why people are paid a premium salary. In the long-term, many straightforward jobs will be analyzed and routinized out of existence, with the narrowly-skilled worker being replaced by teams, machines or computers. But busy jobs are hard to eliminate because they are those in which it is optimal for a variety of disparate and unpredictable tasks to be done by a single person. Consequently, those individuals who can cope with, even thrive-upon, busyness are becoming indispensable. In future 'the busy shall inherit the earth' (or, at least, the most powerful and highest paid jobs), not just in science but in all major social domains.

Employment↗
PubMed1975

Aggressive behaviour of male mice (Mus musculus) towards familiar and unfamiliar opponents.

Two types of colonies of laboratory mice were employed; hierarchically organized ones formed by placing five unfamiliar 8-week-old mice in a cage together and amicably organized colonies in which four male litter mates were kept together throughout the whole period of the experiment. During a 21-day pre-experimental period intra-colony aggressive behaviour was recorded. A dominant animal and ranked subordinates occurred in every hierarchical colony, whilst no aggression was recorded in any of the amicable colonies. During a 25-day period unfamiliar adult male or female mice were introduced daily into the amicable or hierarchical colonies for 10 min. In a third experiment juvenile mice 17, 24, 31 or 38 days old were introduced into hierarchically organized colonies during a 20-day period. In all hierarchical colonies the stranger was attacked irrespective of sex and age; the majority of attacks were carried out by the dominant mouse. Aggression by the dominant declined exponentially throughout the experimental period and regression analyses compared the different data. Unfamiliar adult females were the recipients of fewer attacks than unfamiliar adult males and the age of juvenile strangers was found to be an important factor. Amicably organized mice initially did not attack strangers, but over a period of 25 days the number of attacks on unfamiliar males gradually increased.

Age Factors↗
PubMed2004

Salmon spawning migration and muscle protein metabolism: the August Krogh principle at work.

The August Krogh principle, stating that for any particular question in biology, nature holds an ideal study system, was applied by choosing the anorexic, long-distance migration of salmon as a model to analyze protein degradation and amino acid metabolism. Reexamining an original study done over 20 years ago on migrating sockeye salmon (Oncorhynchus nerka), data on fish migration and starvation are reviewed and a general model is developed on how fish deal with muscle proteolysis. It is shown that lysosomal activation and degradation of muscle protein by lysosomal cathepsins, especially cathepsin D and sometimes cathepsin L, are responsible for the degradation of muscle protein during fish migration, maturation and starvation. This strategy is quite the opposite to mammalian muscle wasting, including starvation, uremia, cancer and others, where the ATP-ubiquitin proteasome in conjunction with ancillary systems, constitutes the overwhelming pathway for protein degradation in muscle. In mammals, the lysosome plays a bit part, if any. In contrast, the proteasome plays at best a subordinate role in muscle degradation in piscine systems. This diverging strategy is put into the context of fish metabolism in general, with its high amino acid turnover, reliance on amino acids as oxidative substrates and flux of amino acids from muscle via the liver into gonads during maturation. Brief focus is placed on structure, function and evolution of the key player in fishes: cathepsin D. The gene structure of piscine cathepsin D is outlined, focusing on the existence of duplicate, paralogous, cathepsin D genes in some species and analyzing the relationship between a female and liver-specific aspartyl protease and fish cathepsin Ds. Evolutionary relationships are developed between different groups of piscine cathepsins, aspartyl proteases and other cathepsins. Finally, based on specific changes in muscle enzymes in fish, including migrating salmon, common strategies of amino acid and carbon flux in fish muscle are pointed out, predicting some metabolic concepts that would make ideal application grounds for the August Krogh principle.

Animals↗
PubMed1998

[Male anorexia nervosa patients in long-term follow-up].

Despite an increasing number of studies on the long-term course of anorexia nervosa, male patients only play a subordinate role in the majority of investigations. Thus, one section of a more comprehensive study aimed at describing possible differences in the disease course of male and female patients. Total assessment after a mean of 12 years revealed a clearly increased mortality rate of more than 20% in 10 of the male patients examined (as well as 2 male anorexia nervosa patients with an additional physical condition). The male survivors had a better prognosis than the females patients. Male anorectics were in better physical condition than their female counterparts at the time of follow-up. On the Morgan Russell scale, food intake, psychosexual and social state showed a more favorable development in male than in female patients. Male patients had a more favorable course regarding psychosocial integration but a similar course as female patients regarding eating disorder symptoms. The results are discussed theoretically and clinically. Further studies with a larger random selection of patients should be carried out.

Adolescent↗
PubMed2004

Hierarchy and social status in Budongo chimpanzees.

The status hierarchy is fundamental in the lives of male chimpanzees. This study describes the dominance interactions and social status among adult male chimpanzees of the Sonso community in the Budongo Forest Reserve, Uganda, during the period that they were first studied (1994 and 1995). Social dominance is typically measured using the behaviour of either the subordinate or the dominant individual, but a relationship is dependent on the behaviour of both parties and this study explicitly used both subordinate and dominant behaviours to investigate the status hierarchy. Among adult males of the Sonso community, agonistic interactions occurred at a low rate and pant-grunts were rare, but males could be ranked into separate hierarchies of agonistic dominance and pant-grunting (labelled 'respect') using ratios of behaviour performed/behaviour received. These hierarchies were combined to form a single hierarchy of social status that divided the males among five distinct status levels. The highest status level was held by an alliance between two males who replaced the previous alpha male during the first part of the study. Neither male in this alliance partnership pant-grunted to the other, although the reason for cooperative behaviour was unclear. Although the nominally beta male was treated as such by other adult males, he achieved surprisingly little mating success. Budongo Forest chimpanzees do not warrant the sometimes-expressed view that they are non-aggressive and peaceable and the broad pattern of their status interactions matches with that seen in other chimpanzee populations.

Agonistic Behavior↗
PubMed1976

Toxic, neurochemical and behavioral effects of dieldrin exposure in mallard ducks.

Toxic, neurochemical and behavioral alterations were evaluated in ducks fed various dietary levels of dieldrin. Increasing amounts of dieldrin in the diet caused an appreciable decrease in the levels of three biogenic amines in whole brain, i.e. serotonin, norepinephrine and dopamine. No effect was noted in whole brain gamma aminobutyric acid contents. Hepatic microsomal enzymes were assayed in these birds using p-nitroanisol and O-ethyl-O-p-nitrophenyl benzenethionophosphate as substrates. Sublethal amounts of dieldrin caused an increase in hepatic drug metabolizing enzymes. Similar alterations were noted in liver protein, deoxyribonucleic acid and ribonucleic acid contents. Studies involving encounters between mallard drakes indicated a decline in the tendency for dieldrin exposed drakes to take the initiative and establish rights of access in approach confrontations. Although many of these changes are compatible with life processes, their significance is not well understood, especially in terms of lifelong exposure to persistent pesticides. The possible relationship between neurochemical alterations and the mechanisms of insecticide neurotoxicity is discussed.

Animals↗
PubMedDate not supplied

Circadian rhythms of locomotor activity in naked mole-rats (Heterocephalus glaber).

A wide variety of organisms exhibit various circadian rhythms in their behavior and physiology. Circadian rhythms are regulated by internal clocks that are generally entrained primarily by the environmental light:dark (L:D) cycle. There have been few studies of circadian rhythms in fossorial species that inhabit an environment where day-night variations are minimal and where exposure to light occurs infrequently. In this study, circadian patterns of wheel-running activity were examined in naked mole-rats (Heterocephalus glaber). Naked mole-rats are fossorial and eusocial, living in colonies of 60-70 animals with only one breeding female. Most individual mole-rats that ran on wheels (65%) exhibited robust circadian rhythms of locomotor activity, entrained to various L:D cycles, and free-ran in constant darkness (DD) with taus averaging 23.5 h. The remainder of the animals either free-ran or were arrhythmic under the various L:D cycles. Mole-rats generally failed to entrain to non-24-h T-cycles with period lengths ranging from T=23 h to T=25 h. There was considerable inter-individual variation in the circadian patterns of locomotor activity in naked mole-rats as is observed in other subterranean mammals that have been studied. In contrast to the results obtained when mole-rats were individually housed with access to running wheels, circadian rhythms of general locomotor activity were typically not observed for animals monitored while they were housed in a colony setting. However, clear nocturnal rhythms of general locomotor activity were displayed by four males while residing in their home colonies. Two of these males exhibited the physical appearance of a disperser morph - subordinate individuals that are believed to leave their home colonies to achieve reproductive opportunities elsewhere. All four of these males were among the largest males in their respective colonies. These results demonstrate that although naked mole-rats are not frequently exposed to light, the species has retained the capacity to exhibit locomotor patterns of circadian rhythmicity and has the ability to entrain to 24-h L:D cycles. The possible adaptive function of this circadian capacity is discussed.

Animals↗
PubMed2003

ADHD: sibling interaction or dominance: an evaluation of statistical power.

Sibling interaction effects are suggested by a difference in phenotypic variance between monozygotic (MZ) twins and dizygotic (DZ) twins, and a pattern of twin correlations that is inconsistent with additive genetic influences. Notably, negative sibling interaction will result in MZ correlations which are more than twice as high as DZ correlations, a pattern also seen in the presence of genetic dominance. Negative sibling interaction effects have been reported in most genetic studies on Attention Deficit Hyperactivity Disorder (ADHD) and related phenotypes, while the presence of genetic dominance is not always considered in these studies. In the present paper the statistical power to detect both negative sibling interaction effects and genetic dominance is explored. Power calculations are presented for univariate models including sources of variation due to additive genetic influences, unique environmental influences, dominant genetic influences and a negative sibling interaction (i.e., contrast effect) between phenotypes of twins. Parameter values for heritability and contrast effects are chosen in accordance with published behavior genetic studies on ADHD and associated phenotypes. Results show that when both genetic dominance and contrast effects are truly present and using a classical twin design, genetic dominance is more likely to go undetected than the contrast effect. Failure to detect the presence of genetic dominance consequently gives rise to slightly biased estimates of additive genetic effects, unique environmental effects, and the contrast effect. Contrast effects are more easily detected in the absence of genetic dominance. If the significance of the contrast effect is evaluated while also including genetic dominance, small contrast effects are likely to go undetected, resulting in a relatively large bias in estimates of the other parameters. Alternative genetic designs, such as adding pairs of unrelated siblings reared together to a classical twin design, or adding non-twin siblings to twin pairs, greatly enhances the statistical power to detect contrast effects as well as the power to distinguish between genetic dominance and contrast effects.

Analysis of Variance↗
PubMed2004

Optimal reproductive-skew models fail to predict aggression in wasps.

Optimal-skew models (OSMs) predict that cooperative breeding occurs as a result of dominants conceding reproductive benefits to subordinates, and that division of reproduction within groups reflects each cooperator's willingness and ability to contest aggressively for dominance. Polistine paper wasps are a leading model system for testing OSMs, and data on reproduction and aggression appear to support OSMs. These studies, however, measure aggression as a single rate rather than by the activity patterns of individuals. This leads to a potential error: if individuals are more likely to receive aggression when active than when inactive, differences in aggression across samples can reflect changes in activity rather than hostility. This study replicates a field manipulation cited as strongly supporting OSMs. We show that fundamentally different conclusions arise when controlling for individual activity states. Our analyses strongly suggest that behaviours classified as 'aggression' in paper wasps are unlikely to function in establishing, maintaining or responding to changes in reproductive skew. This illustrates that OSM tests using aggression or other non-reproductive behaviour as a metric for reproductive partitioning must demonstrate those links rather than assume them.

Aggression↗
PubMed2006

Predator threat induces behavioral inhibition, pituitary-adrenal activation and changes in amygdala CRF-binding protein gene expression.

Behavioral inhibition (BI) is an adaptive defensive response to threat; however, extreme BI is associated with anxiety-related psychopathology. When rats are exposed to a natural predator they display stress- and anxiety-related behavioral alterations and physiological activation. To develop a preclinical rodent model to study mechanisms underlying human BI and anxiety, we examined the extent to which ferret exposure elicits anxiety-related BI and HPA and amygdala activation of the CRF system. In the first experiment, BI and other behaviors were assessed in the presence or absence of a ferret. In the second experiment, ferret-induced corticosterone release and changes in brain c-fos expression were assessed. In the final experiment, gene chip and quantitative real time-PCR analyses were performed on amygdala tissue from control and ferret-exposed rats. Ferret exposure increased BI and submissive posturing, as well as plasma corticosterone and the number of Fos-positive cells in several brain regions including the amygdala. Gene expression analysis revealed increased amygdalar mRNA for CRF-binding protein, but not the CRF1 receptor, CRF2 receptor or CRF. In rodents, ferret exposure can be used to elicit anxiety-related BI, which is associated with HPA and amygdala activation. Since the amygdala and the CRF system have been implicated in adaptive and maladaptive anxiety responses in humans, these data support use of our rodent model to further investigate mechanisms underlying anxiety-related psychopathology in humans.

Amygdala↗
PubMed2004

Fitness consequences of allorecognition-mediated agonistic interactions in the colonial hydroid Hydractinia [GM].

In sessile and sedentary organisms, competition for space may have fitness consequences that depend strongly on ecological context. Colonial hydroids in the genus Hydractinia use an inducible defense when encountering conspecifics, and intraspecific competition is common in natural populations, often resulting in complete overgrowth of subordinate competitors. My goal in this study was to quantify the impacts of agonistic interactions in Hydractinia [GM] (an undescribed species from the Gulf of Mexico) in terms of three primary fitness components: colony survival, growth rate, and immature gonozooid production. The results demonstrate that the fitness consequences of intraspecific competition depend on the size at which competitive encounters are initiated and the growth form (an indicator of competitive ability) of the competitors. Moreover, some competing colonies consistently produced more immature gonozooids than the controls without competition, and they exhibited extremely low mortality even after 90 days of growth. These results have several ramifications. First, agonistic interactions do not always proceed to competitive elimination. Second, the increase in production of immature gonozooids--an investment in future reproduction--in response to intraspecific competition supports the hypothesis that indeterminately growing organisms increase sexual reproductive effort when growth becomes limiting. Lastly, in light of known ontogenetic variation in the ability of Hydractinia to differentiate among genetically related colonies, strongly size-dependent fitness consequences are consistent with an adaptive, kin-discriminating allorecognition system.

Agonistic Behavior↗
PubMedDate not supplied

Aging, narrative organization, presentation mode, and referent choice strategies.

We examined age differences in referent choice strategies when narrative organization and presentation mode taxed working memory. Readers could use the following cues to choose referents for an ambiguous pronoun: (a) thematic cue (main/minor character), (b) foreground cue (character in main/subordinate clause), and (c) recency of mention of character. Subjects read short narratives with a critical sentence that mentioned the main character in the main clause of the critical sentence (congruent condition) or in the subordinate clause of this sentence (incongruent condition). They chose the main or minor character as referent for a pronoun in the next (target) sentence. Experiment 1 examined how older and young readers use these cues with the Memory narrative presentation (target sentence presented on a separate page from the rest of the narrative). Young readers used similar strategies as those in Morrow (1985), where narrative presentation did not tax memory. Thus, the Memory presentation had little influence on their strategies. However, older readers were less consistent and tended to split in choosing the two characters. In Experiment 2, where narrative presentation did not tax working memory, older readers used similar strategies to the young readers in Experiment 1. Experiment 3 found that elders reading narratives with the Memory presentation recalled the nonpreferred character name after the narrative, suggesting that both characters were accessible from working memory. The study suggests that the Memory presentation mode in Experiment 1 interfered with elders' consistent use of narrative cues in choosing referents, especially when these cues conflict.

Adolescent↗
PubMed2001

[Effect of genotype and social stress on cAMP- and substrate-dependent mechanisms of regulating hormonal function of testis in mice].

Several steps of cAMP- and substrate-dependent testosterone production in the testes were studied with laboratory mouse micropopulations of six inbred strains (A/He, CBA/Lac, C57BL/6J, DD, YT, PT). The strains differed in basal testosterone production in the gonads and in its response to activation of the adenylate cyclase signal transduction pathway at various steps by human chorionic gonadotropin (hCG), the cholera toxin, forskolin, and dibutyryl-cAMP and in the presence of pregnenolone, an early precursor of testosterone. Establishment of dominant-subordinate relationships in mouse populations substantially affected testosterone production in response to all activators of testicular steroidogenesis. The secretory activity of the testes decreased at the early establishment of social hierarchy in experimental micropopulations, then returned to the initial level, and again decreased in the case of activation with hCG, dibutyryl-cAMP, and pregnenolone. With all activators of steroidogenesis, basal and activated testosterone production changed in the same direction during the establishment and maintenance of social hierarchy, suggesting coordinated changes in all examined steps of testosterone biosynthesis in the testes. The among-strain differences in response to all activators of steroidogenesis remained much the same at various stages of the establishment of social hierarchy. The parameters of cAMP- and substrate-dependent testosterone production averaged over individual stages of the establishment of social hierarchy proved associated. Their genotypic correlations were positive and, in many cases, significant. Subsequent component analysis showed that one principal component accounted for more than 80% of the total among-strain variation, suggesting a coordinated genetic control of the endocrine function of the testes.

Animals↗
PubMed1983

Social instability and coronary artery atherosclerosis in cynomolgus monkeys.

Epidemiologic research has increasingly implicated psychological factors in the emergence of atherosclerotic coronary heart disease in human beings. The study of behavioral influences on atherogenesis in man, however, is impeded by the difficulty of assessing coronary artery atherosclerosis in asymptomatic individuals and by the fact that significant arterial lesions typically develop only over relatively protracted intervals. Consequently, we have recently attempted development of an appropriate animal model for examining the atherogenic effects of psychosocial variables. In the first of two investigations, an experimental stressor--involving repeated reorganization of socially housed groups of adult, male cynomolgus monkeys (Macaca fascicularis) fed a moderately atherogenic diet--resulted in increased coronary artery atherosclerosis relative to control animals, though only among monkeys which retained dominant social status over the 22 months of the study. In the second investigation, which employed the same experimental procedures among monkeys fed a low cholesterol/low saturated fat diet, periodic social group reorganization similarly led to development of greater atherosclerosis in the coronary arteries. In neither experiment were psychosocial influences on coronary atherogenesis attributable to the concomitant effects of other physiologic variables commonly associated with atherosclerosis (e.g., serum lipids, blood pressure).

Aggression↗
PubMed2003

High levels of extra-group paternity in a population of Australian magpies Gymnorhina tibicen: evidence from microsatellite analysis.

Breeding systems vary widely in birds, from monogamous pairs through to complex group systems where subordinates assist breeding individuals to rear young each season. The Australian magpie varies geographically both in plumage patterns and social organization. Some populations of both eastern and western plumage forms are plural breeders with group size varying from three to over 15 mature individuals. This study used variation at microsatellite loci to determine the level of extra-group paternity in a population of the western form near Perth in Western Australia. Extra-group paternity was the highest recorded for any bird species to date (82%) and indicates that few offspring within a territory are sired by the social partner of the female. In addition, the data indicated that nearly 10% of juveniles were not the genetic offspring of any female within their territory, suggesting some intraspecific brood parasitism. Taken together, these findings are remarkable considering the highly territorial nature of the species and the extent of territorial defence practised by all members of the group towards extra-group conspecifics during daylight hours.

Animals↗
PubMed2000

Extra-pair paternity as the result of reproductive transactions between paired mates.

Transactional ('optimal skew' or concessions') models of social evolution emphasize that dominant members of society can be favoured for donating parcels of reproduction to same-sexed subordinates in return for cooperation by the latter. We developed a mathematically similar model in which extra-pair paternity in broods receiving biparental care is viewed as emerging from a reproductive transaction between the paired mates. The model quantitatively predicted the maximum paternity that a male mate can demand before its female mate is favoured to break the pair bond and caring solitarily for a brood sired entirely by a neighbouring male. The model predicts that extra-pair paternity results when the neighbouring male is of sufficiently higher quality than the male mate. In such cases, the exact amount of extra-pair paternity will vary directly with the difference in quality between the two males and inversely with the value (fitness impact) of the male mate's parental care. Importantly, the transactional model provided a unified explanation for experimental and observational evidence that extra-pair paternity rises with decreasing quality of the male mate, increasing genetic variability among breeding males, increasing breeding density, increasing availability of food and decreasing involvement of the male mate in parental care.

Animals↗
PubMed1998

The development of addiction to d-amphetamine in an animal model: same principles as for alcohol and opiate.

We have established a rat model that reflects the course of development of alcohol and opiate addiction. The present study with d-amphetamine aimed to define general principles in the development of an addiction. Male rats had a continuous free choice between d-amphetamine solutions (100, 200 and 400 mg/l) and water for 47 weeks. An initial intake of high doses of d-amphetamine during the first weeks of drug choice was followed by an individually stable pattern of drug consumption of moderate drug doses. During this period of controlled consumption (from week 10 to week 40), the voluntary intake of d-amphetamine depended on individual factors (dominant rats: 0.37+/-0.02 mg/kg per day, subordinate rats: 0.57+/-0.05 mg/kg per day) and environmental variables (group housing: 0.21+/-0.02 mg/kg per day, single housing: 0.41+/-0.03 mg/kg per day). Beginning with week 41, voluntary d-amphetamine consumption progressively increased (1.9+/-0.2 mg/kg per day in week 47), although the experimental conditions remained unchanged. Drug intake during a retest (free choice as before) after 6 months of drug deprivation revealed that the rats had persistently lost their control over drug intake and were no longer able to adjust drug taking to internal and external conditions. These addicted rats took very high drug doses, even when all d-amphetamine solutions but not water were adulterated with bitter tasting quinine (6.6+/-0.6 mg/kg per day; age-matched controls: 0.37+/-0.04 mg/kg per day). Forced intake of d-amphetamine for 47 weeks (7.1+/-0.3 mg/kg per day) via the drinking fluid caused physical dependence (hyperreactivity during withdrawal) but did not lead to drug addiction (voluntary intake in the retest with adulteration: 0.42+/-0.04 mg/kg per day). Both the temporal development and the prerequisites of psychostimulant addiction were in principle the same as for alcohol and opiates.

Animals↗
PubMed1994

Effects of environmental enrichment on aggressive behavior, dominance hierarchies, and endocrine states in male DBA/2J mice.

Adult male mice (DBA/2J) siblings were housed three per cage for 6 wk, either in standard cages (SC) or in enriched cages (EC). Both attacks among group members and attacks against strange intruders were monitored once a week within each of 22 experimental groups. According to its attacking behavior, each mouse was categorized into one of three dominance categories: dominant, subdominant active, subdominant passive. Aggressive behavior and social organization were compared between the two types of housing conditions, and the effects of housing condition and dominance category on endocrinological and some organometrical parameters were analysed. The main findings were: (a) Mice in EC attacked intruders significantly more frequently compared to mice in SC; (b) In EC groups the position of the dominant male was less stable than in SC groups; (c) Plasma corticosterone titers (PCT) were significantly elevated in EC. Activities of tyrosinehydroxylase (TH) and phenylethanolamine-N-methyltransferase (PNMT) did not differ significantly between the housing conditions; (d) TH and PNMT activity were significantly enhanced in the dominant males of SC groups compared to subdominant passive males. Intermediate activities for both enzymes were determined for subdominant active males; and (e) PCT were significantly elevated in dominant males of the EC groups compared to subdominant active and subdominant passive males and also compared to the dominant males in the SC groups. Findings suggest that keeping adult male mice in structured cages can result in increased aggression towards intruders, a change in the social organization, and altered endocrine states, depending on the individual dominance position.

Aggression↗