Global ETD Search
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Showing 1 to 15 of 15 for “"Eusociality"”.
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Evolution of Altruism and Eusociality: Toward a Cost/Benefit Analysis of Fitness and Genetic Relatedness
… and inclusive fitness indeed are causal and that eusociality does evolve more readily. With regard to the latter this means eusociality can be favored under a lower benefits threshold. I concluded that multiple modeling approaches are useful and that efforts to synthesize them are better than …
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Genomic studies of social evolution in bees
… encompasses multiple, independent evolutions of eusociality. In Chapter 1, I provide a detailed overview of the chapters contained in this dissertation. In Chapter 2, I review current progress in molecular evolutionary analyses of the social insects and outline some common themes emerging from …
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Reproductive plasticity and the evolution of the insect societies
… biology is to understand how novel traits arise. Eusociality represents an extreme form of social organization which has evolved independently a number of times across insects and is characterized especially in the Hymenoptera by a novel polyphenism between reproductive (queen) and …
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The energetics of sociality in the molerats (Bathyergidae)
… It also isolates the the probable causes of eusociality within the molerats (Bathyergidae). The bathyergids display the widest range of sociality of all mammals, from strictly solitary genera (Bathyergus, Georychus, Heliophobius), to social and eusocial genera (Cryptomys and Heterocephalus). …
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Mechanisms involved in eusocial evolution in bees
… and the most extreme form of group living, eusociality, has evolved multiple independent times within the bees. Recent advances in genome sequencing and analysis technologies have opened up new research avenues for large-scale studies of molecular function and evolution in non-model species …
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Nutritional status influences behavior, physiology, and brain gene expression in primitively eusocial Polistes metricus paper wasps
… it may give more insight into the evolution of eusociality. We tested the effect of nutrition on worker division of labor in primitively eusocial insects at three different levels: behavior, physiology, and brain gene expression. In order to understand the effects of nutrition, I manipulated the …
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New Insights into the Evolution of Learned Vocalization from the Australian Zebra Finch, Taeniopygia castanotis
… weaker muscles, higher intelligence, greater eusociality, novel sweat glands, and spoken language; to name a few of the traits which separate us from other apes. As there are no extant species internal to this branch lacking one or more of these human specific phenotypes, it is much more …
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Hybridization in Ants
… act differently in ants than in other species: eusociality and haplodiploidy. These factors serve to reduce the costs of interspecific hybridization in ants while simultaneously allowing them to take advantage of certain benefits. Eusociality may mitigate the effects of hybridization by allowing …
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Probing the protein homeostasis mechanisms in long-lived naked mole-rats
… which has unique biological features including eusociality, strict subterranean inhabitation and poikilothermy. It is the longest-living rodent, showing negligible senescence over the majority of its lifespan and high resistance to diseases such as cancer and neurodegeneration. This animal is …
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Safer without Sex?
… clearly fulfills all three conditions of eusociality, the evolution of thelytoky is interpreted as a first step in a secondary reverse social evolution towards a social system more primitive than eusociality.
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Comparing reversal-learning abilities, sucrose responsiveness, and foraging experience in scout and non-scout honey bee (Apis mellifera) foragers
Honey bees (Apis mellifera) colonies divide foraging activities between scouts, who search for new sources of food, and non-scouts, who rely on information from waggle dances to find food sources. Molecular analyses of scouts and non-scouts have revealed differences in the expression of numerous …
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RNA interference of worker sterility genes: Testing mechanisms of reproductive regulation in Apis mellifera
Social insects such as the honey bee (Apis mellifera) are well known for their reproductive division of labour and eusocial colony systems. Honey bee workers forgo reproduction in favour of being selfless in directing reproductive benefits towards their queen mother. This altruistic tendency is a …
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Insect Development and Evolution: Perspectives on Individual and Colony-Level Phenotypes
<p>This dissertation analyzes the develop and evolution of insect phenotypes, ranging from the level of individuals to colonies. The first four chapters focus on wing patterning in the bella moth Utetheisa ornatrix. I begin by quantifying the pattern variation in the species, then attempt to …
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Exploring the evolution of social behaviour using genomic data
Sociality is at the root of tremendous ecological success of several taxa, including humans, ants, bees, wasps and termites. The degree and type of sociality varies greatly across taxa. The evolution of complex social behaviour can be studied by performing comparative analyses of organisms across a …
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The Life History of Damaraland Mole-rats Fukomys damarensis: Growth, Ageing and Behaviour
The social mole-rats have often been typecast as extreme examples of mammalian sociality. With their pronounced reproductive skew, status-related contrasts in lifespan and morphology, and the suggestion of a division of labour amongst helpers, mole-rat societies have repeatedly been likened to the …