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Effects of food quality on trade-offs among growth, immunity and survival in the greater wax moth Galleria mellonella 被引量:5
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作者 Indrikis Krams Sanita Kecko +7 位作者 Katariina Kangassalo Fhionna R. Moore Eriks Jankevics Inna Inashkina tatjana krama Vilnis Lietuvietis Laila Meija Markus J. Rantala 《Insect Science》 SCIE CAS CSCD 2015年第3期431-439,共9页
The resources available to an individual in any given environment are finite, and variation in life history traits reflect differential allocation of these resources to competing life functions. Nutritional quality of... The resources available to an individual in any given environment are finite, and variation in life history traits reflect differential allocation of these resources to competing life functions. Nutritional quality of food is of particular importance in these life history decisions. In this study, we tested trade-offs among growth, immunity and survival in 3 groups of greater wax moth (Galleria mellonella) larvae fed on diets of high and average nutritional quality. We found rapid growth and weak immunity (as measured by encapsulation response) in the larvae of the high-energy food group. It took longer to develop on food of average nutritional quality. However, encapsulation response was stronger in this group. The larvae grew longer in the low-energy food group, and had the strongest encapsulation response. We observed the highest survival rates in larvae of the low-energy food group, while the highest mortality rates were observed in the high-energy food group. A significant negative correlation between body mass and the strength of encapsulation response was found only in the high-energy food group revealing significant competition between growth and immunity only at the highest rates of growth. The results of this study help to establish relationships between types of food, its nutritional value and life history traits of G. mellonella larvae. 展开更多
关键词 Galleria mellonella GROWTH IMMUNITY life history NUTRITION SURVIVAL
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Trade-off between cellular immunity and life span in meal- worm beetles Tenebrio molitor 被引量:1
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作者 Indrikis KRAMS Janina DAUKSTE +4 位作者 Inese KIVLENIECE Ants KAASIK tatjana krama Todd M. FREEBERG Markus J. RANTALA 《Current Zoology》 SCIE CAS CSCD 2013年第3期340-346,共7页
Encapsulation is a nonspecific, cellular response through which insects defend themselves against multicellular pathogens. During this immune reaction, haemocytes recognize an object as foreign and cause other haemocy... Encapsulation is a nonspecific, cellular response through which insects defend themselves against multicellular pathogens. During this immune reaction, haemocytes recognize an object as foreign and cause other haemocytes to aggregate and form a capsule around the object, often consisting of melanized cells. The process of melanisation is accompanied by the forma- tion of potentially toxic reactive oxygen species, which can kill not only pathogens but also host cells. In this study we tested whether the encapsulation response is costly in mealworm beetles Tenebrio molitor. We found a negative relationship between the duration of implantation via a nylon monofilament and remaining life span. We also found a negative relationship between the strength of immune response and remaining life span, suggesting that cellular immunity is costly in T. molitor, and that there is a trade-off between immune response and remaining life span. However, this relationship disappeared at 31-32 hours of implanta- tion at 25 ± 2℃. As the disappearance of a relationship between duration of implantation and lifespan coincided with the highest values of encapsulation response, we concluded that the beetles stopped investment in the production of melanotic cells, as the implant, a synthetic parasite, was fully isolated from the host's tissues . 展开更多
关键词 Cost of immunity Cellular immunity ENCAPSULATION LIFESPAN Tenebrio molitor
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Previous encapsulation response enhances within individual protection against fungal parasite in the mealworm beetle Tenebrio mofitor 被引量:1
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作者 Indrikis Krams Janina Daukste +2 位作者 Inese Kivleniece tatjana krama Markus J. Rantala 《Insect Science》 SCIE CAS CSCD 2013年第6期771-777,共7页
Immune defenses of insects show either broad reactions or specificity and durability of induced protection against attacking parasites and pathogens. In this study, we tested whether encapsulation response against nyl... Immune defenses of insects show either broad reactions or specificity and durability of induced protection against attacking parasites and pathogens. In this study, we tested whether encapsulation response against nylon monofilament increases between two attempts of activation of immune system in mealworm beetles Tenebrio molitor, and whether previous exposure to nylon monofilament may also increase protection against an entomopathogenic fungus. We found that survival of beetles subjected to immune activation by nylon implant and subsequent fungal exposure a week later was significantly higher than survival of beetles which had been subjected to fimgal infection only. This result suggests that previous immune activation by the nylon implant may be considered as broad spectrum "immune priming" which helps to fight not only the same intruder but also other parasites. 展开更多
关键词 antifungal protection ecological immunology encapsulation response immune priming invertebrate immunity Tenebrio molitor
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Spider odors induce stoichiometric changes in fruit fly Drosophila melanogaster
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作者 Ronalds KRAMS tatjana krama +7 位作者 Maris MUNKEVICS Sarah EICHLER David M.BUTLER Linda DOBKEVICA Priit JOERS Jorge CONTRERAS-GARDUNO Janina DAUKSTE Indrikis A.KRAMS 《Current Zoology》 SCIE CAS CSCD 2021年第1期127-129,共3页
Animal senses and signals are amazingly diverse,and the major modalities by which animals acquire sensory input from their environments are sound,light,vibration,and chemical signals.Insects mainly rely on visual,noci... Animal senses and signals are amazingly diverse,and the major modalities by which animals acquire sensory input from their environments are sound,light,vibration,and chemical signals.Insects mainly rely on visual,nociceptive,and olfactory cues to discriminate between rewards and risks.It has been shown that the visual and olfactory cues of predators substantially affect the adult phenotype in Drosophila melanogaster(Krams et al.2016),a prominent animal model for biological research. 展开更多
关键词 MELANOGASTER CUES DROSOPHILA
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