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Both host and diet shape bacterial communities of predatory mites 被引量:1
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作者 Hong Yan Endong Wang +2 位作者 Guo-Shu Wei Bo Zhang Xuenong Xu 《Insect Science》 SCIE CAS CSCD 2024年第2期551-561,共11页
Microbial communities,derived from food,ambient,and inner,can affect host ecological adaption and evolution.Comparing with most phytophagous arthropods,predators may have more opportunities to develop specific microbi... Microbial communities,derived from food,ambient,and inner,can affect host ecological adaption and evolution.Comparing with most phytophagous arthropods,predators may have more opportunities to develop specific microbiota depending on the level of prey specialization.To explore how diet sources affect host microbial communities and vary across predator species,we considered 3 types of predators from Phytoseiidae(Acari:Mesostigmata):polyphagous(Amblyseius orientalis Ehara,Neoseiulus barkeri Hughes,and Amblyseius swirski Athias-Henrio),oligophagous(Neoseiulus californicus McGregor),and monophagous(Phytoseiulus persimilis Athias-Henriot)predatory mites.The polyphagous species were fed on 2 types of diets,natural prey and alternative prey.By using 16S rRNA sequencing,we found that diet was the main source of microbiota in predatory mites,while there was no clear pattern affected by prey specialization.Among 3 polyphagous predators,host species had a larger impact than prey on microbial composition.Unlike A.orientalis or N.barkeri which showed consistency in their microbiota,prey switching significantly affectedβ-diversity of bacterial composition in A.swirskii,with 56%of the microbial alteration.In short,our results confirmed the substantial influence of diet on host microbial construction in predatory species,and highlighted species differences in shaping the microbiota which are not necessarily related to prey specialization. 展开更多
关键词 diet switching feeding habits host-microbial interactions invertebrate microbiota 16S rRNA
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同位素富集-稀释法研究食性转变对鱼类不同组织N同位素转化率的影响 被引量:8
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作者 曾庆飞 谷孝鸿 +1 位作者 毛志刚 周露洪 《生态学报》 CAS CSCD 北大核心 2012年第4期1257-1263,共7页
稳定同位素技术广泛地用于描绘生态系统中食物网的食物来源和营养级关系,但是消费者不同组织转化率的研究相对较少。通过锦鲤摄食人工添加15N蓝藻的食性转化实验,研究不同组织N同位素转化率的差异,探讨组织生长和代谢对同位素转化的相... 稳定同位素技术广泛地用于描绘生态系统中食物网的食物来源和营养级关系,但是消费者不同组织转化率的研究相对较少。通过锦鲤摄食人工添加15N蓝藻的食性转化实验,研究不同组织N同位素转化率的差异,探讨组织生长和代谢对同位素转化的相对贡献,为不同时间尺度的稳定同位素研究取样奠定基础。结果表明,通过42d的加富蓝藻饲喂,各组织的N稳定同位素发生显著变化。肝的δ15N为(19.3±1.4)‰,显著高于其它组织,其次为鱼鳍((15.6±1.0)‰)和血液((12.6±0.4)‰),肌肉的δ15N‰最低,为(9.9±0.7)‰。在随后的同位素稀释实验中,锦鲤的体重增加,相对生长速率为0.011d-1,鳍肉的转化率最快,达到11.4%/d,半衰期仅为6.1d,其次是血液和肝,肌肉的转化率最低,仅有3.8%/d,半衰期最长,为18.4d。代谢衰减指数c和-1不存在显著差异,表明锦鲤各组织的N同位素转化主要由组织生长引起。结论显示,同位素富集-稀释法可以有效评价鱼类食性转变对不同组织同位素转化的差异,鳍肉和血液同位素分析可以作为锦鲤食性转变快速追踪的手段。 展开更多
关键词 稳定同位素 同位素富集-稀释法 食性转变 同位素转化率
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Ontogenetic changes in isotopic signatures of an omnivorous fish Cultrichthys erythropterus in East Lake Taihu,China
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作者 李云凯 张妙 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2015年第3期725-731,共7页
The relationship between body size and stable isotopic signatures of the omnivorous Redfin Culter(C ultrichthys erythropterus),commonly found in East Lake Taihu,was investigated. Previous analyses of C. erythropterus ... The relationship between body size and stable isotopic signatures of the omnivorous Redfin Culter(C ultrichthys erythropterus),commonly found in East Lake Taihu,was investigated. Previous analyses of C. erythropterus stomach contents have shown that this species undergoes a diet switch from being predominantly zooplanktivorous to piscivorous during its life history. This was confirmed by stable carbon isotopic signature(δ 13 C) in this study,in which δ 13 C was positively correlated with both standard length and weight. The importance of littoral-benthic resources in supporting C. erythropterus during its lifespan was also demonstrated using a two-source mixing model,the results of which showed a significant increasing trend in the contribution of littoral-benthic energy. However,the stable nitrogen isotopic signature(δ 15N) exhibited an unusual pattern compared with previous studies. The δ 15 N of C. erythropterus showed no relationship with body size,even though dietary changes were observed. This indicated that δ 15 N alone cannot fully reflect a diet shift in a species and possible variability in isotopic signatures over its life history. This should be considered when using stable isotopic signatures to investigate intra-specific variations and the timing of life-history events,such as estimating the trophic positions of fish species. 展开更多
关键词 Redfin Culter diet switch stable isotope analyses East Lake Taihu
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恢复正常饮食对高脂高胆固醇饮食诱导小鼠脂肪肝的改善作用
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作者 林晓转 辛妍 +3 位作者 李翔 朱璇 张佩雯 郭红辉 《营养学报》 CAS CSCD 北大核心 2023年第6期559-564,共6页
目的 观察恢复正常饮食对高脂高胆固醇(HFHC)饮食诱导非酒精性脂肪性肝病(NAFLD)的改善作用,并探讨其中的作用机制。方法 HFHC饮食16w诱导建立小鼠NAFLD模型后随机分为模型对照组和恢复正常饮食干预组,并设正常对照组。模型对照组饲喂H... 目的 观察恢复正常饮食对高脂高胆固醇(HFHC)饮食诱导非酒精性脂肪性肝病(NAFLD)的改善作用,并探讨其中的作用机制。方法 HFHC饮食16w诱导建立小鼠NAFLD模型后随机分为模型对照组和恢复正常饮食干预组,并设正常对照组。模型对照组饲喂HFHC饲料,恢复正常饮食干预组饲喂正常饲料,正常对照组饲喂正常饲料。10 w后处死所有小鼠,检测小鼠血脂水平、血清胆汁酸组成、肝功能和组织形态学差异。16S rDNA测序分析盲肠内容物中肠道菌群的组成。结果 模型对照组小鼠的血清总胆固醇、丙氨酸氨基转移酶、天冬氨酸氨基转移酶和低密度脂蛋白胆固醇水平较正常对照组小鼠显着升高,恢复正常饮食干预显着降低上述指标(P<0.05)。在模型对照组小鼠肝组织可见明显脂肪变性和气球样变,而恢复正常饮食干预可有效改善NAFLD活动性评分(P<0.05)。此外,恢复正常饮食干预有助于降低NAFLD小鼠血清胆汁酸疏水指数,减少盲肠内容物中Ruminococcaceae_UCG-010丰度,增加Anaerotruncus和Ruminococcaceae_NK4A214_group丰度(P<0.05)。结论 恢复正常饮食可通过影响胆汁酸代谢和肠道菌群组成改善HFHC饮食诱导的NAFLD。 展开更多
关键词 恢复正常饮食 非酒精性脂肪性肝病 胆汁酸 肠道菌群
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