Please use this identifier to cite or link to this item: http://rportal.lib.ntnu.edu.tw:80/handle/20.500.12235/111536
Title: 尼泊爾埋葬蟲的社會演化與生殖適應的基因體研究
Social evolution and genomic investigation of breeding adaptation in burying beetles
Authors: 沈聖峰
蔡怡陞
Shen, Sheng-Feng
Tsai, Isheng Jason
陳伯飛
Chen, Bo-Fei
Keywords: social evolution
cooperative behavior
comparative genomics
seasonal breeder
continuous breeder
burying beetle
social evolution
cooperative behavior
comparative genomics
seasonal breeder
continuous breeder
burying beetle
Issue Date: 2019
Abstract: none
Competition shapes the evolution of life and determines how organisms live now. Carcasses are nutritious but unpredictable and transient resources that drive intense competition among scavengers and microbiomes. Burying beetles (Coleoptera: Silphidae: Nicrophorus) are one of the unique scavenging insects which use small vertebrate carcasses as the sole resources to reproduce. To compete against the major interspecific competitor, blowflies, they formed cooperative groups on carcasses. This study used a series of field and laboratory experiments to clarify the mechanism of group formation in burying beetles and found that interspecific competition drove Nicrophorus nepalensis to use a sulfur-containing organic volatile compound, dimethyl disulfide (DMDS) as the cue to indicate interspecific competition and form social groups on carcasses. On the other hand, the interspecific competition also drove N. nepalensis to evolve two breeding types, i.e., continuous breeding (CB) and seasonal breeding (SB), among populations. To understand the transition in the molecular mechanism between two breeding types, I performed the genomic comparison among N. nepalensis and 14 Hexapoda species and the transcriptomic comparisons between two N. nepalensis populations. The results showed the insects of two breeding types had convergent evolution at gene levels, respectively, and N. nepalensis shared breeding-type specific genes with both breeding types. These two studies provide evidence to demonstrate how N. nepalensis adapt to interspecific competition in terms of cooperative behavior and also adjusting breeding seasons. When the pressure of interspecific competition increases, N. nepalensis shifts from intraspecific competition to cooperation to compete with interspecific competitors. Because N. nepalensis has both breeding-type specific gene features in its genome, N. nepalensis can adjust the breeding season to avoid interspecific competitors when the competitive pressure is too high. Differentiation in the length of breeding seasons implies N. nepalensis has local adaptation among populations. In future work, the study would be focused on the molecular evolution among populations using genomic data in order to further understand the local adaptation and its driving forces in N. nepalensis.
URI: http://etds.lib.ntnu.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=id=%22G080150004S%22.&
http://rportal.lib.ntnu.edu.tw:80/handle/20.500.12235/111536
Other Identifiers: G080150004S
Appears in Collections:學位論文

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