A switch of microbial flora coupled with ontogenetic niche shift in Leptinotarsa decemlineata

2021 ◽  
Author(s):  
Wei‐Nan Kang ◽  
Lin Jin ◽  
Kai‐Yun Fu ◽  
Wen‐Chao Guo ◽  
Guo‐Qing Li
Keyword(s):  
Leptinotarsa Decemlineata ◽  
Microbial Flora ◽  
Niche Shift ◽  
Ontogenetic Niche Shift ◽  
Ontogenetic Niche

scholarly journals A Parent-Offspring Trade-Off Limits the Evolution of an Ontogenetic Niche Shift

2017 ◽  
Vol 190 (1) ◽  
pp. 45-60 ◽  
Author(s):  
Hanna ten Brink ◽  
André M. de Roos
Keyword(s):  
Niche Shift ◽  
Trade Off ◽  
Ontogenetic Niche Shift ◽  
Ontogenetic Niche

Evidence that an ontogenetic niche shift by native masu salmon facilitates invasion by nonnative brown trout

2012 ◽  
Vol 14 (10) ◽  
pp. 2049-2056 ◽  
Author(s):  
Koh Hasegawa ◽  
Chitose Yamazaki ◽  
Kazumasa Ohkuma ◽  
Masatoshi Ban
Keyword(s):  
Brown Trout ◽  
Masu Salmon ◽  
Niche Shift ◽  
Ontogenetic Niche Shift ◽  
Ontogenetic Niche

scholarly journals Hormonal signaling cascades required for phototaxis switch in wandering Leptinotarsa decemlineata larvae

2018 ◽  
Author(s):  
Qing-Wei Meng ◽  
Qing-Yu Xu ◽  
Tao-Tao Zhu ◽  
Lin Jin ◽  
Kai-Yun Fu ◽  
...  
Keyword(s):  
Leptinotarsa Decemlineata ◽  
Transient Receptor Potential ◽  
Receptor Potential ◽  
Niche Shift ◽  
Phototactic Behavior ◽  
Development Stages ◽  
Ontogenetic Niche Shift ◽  
Transient Receptor ◽  
Light Avoidance ◽  
Pupation Site

AbstractMany animals exploit several niches sequentially during their life cycles, a fitness referred to as ontogenetic niche shift (ONS). To successfully accomplish ONS, transition between development stages is often coupled with changes in one or more primitive, instinctive behaviors. Yet, the underlining molecular mechanisms remain elusive. We show here that Leptinotarsa decemlineata larvae finish their ONS at the wandering stage by leaving the plant and pupating in soil. At middle wandering phase, larvae also switch their phototactic behavior, from photophilic at foraging period to photophobic. We find that enhancement of juvenile hormone (JH) signal delays the phototactic switch, and vise verse. Moreover, RNA interference (RNAi)-aided knockdown of LdPTTH (prothoracicotropic hormone gene) or LdTorso (PTTH receptor gene) impairs avoidance response to light, a phenotype nonrescuable by 20-hydroxyecdysone. Consequently, the RNAi beetles pupate at the soil surface or in shallow layer of soil, with most of them failing to construct pupation chambers. Furthermore, a combination of depletion of LdPTTH/LdTorso and disturbance of JH signal causes no additional effects on light avoidance response and pupation site. Finally, we establish that TrpA1 (transient receptor potential (TRP) cation channel) is necessary for light avoidance behavior, acting downstream of PTTH. We conclude that JH/PTTH cascade concomitantly regulates metamorphosis and the phototaxis switch, to drive ONS of the wandering beetles from plant into soil to start the immobile pupal stage.Author summaryMany animals occupy distinct niches and utilize diverse resources at different development stages in order to meet stage-dependent requirements and overcome stage-specific limitations. This fitness is referred to as ontogenetic niche shift (ONS). During the preparation for ONS, animals often change one or more primitive, instinctive behaviors. Holometabolous insects, with four discrete developmental periods usually in different niches, are a suitable animal group to explore the molecular modes of these behavioral switches. Here we find that Leptinotarsa decemlineata larvae, an insect defoliator of potatoes, switch their phototactic behavior, from photophilic at feeding period to photophobic during the larval-pupal transition (wandering stage). This phototactic switch facilitates the wandering larvae to accomplish the ONS from potato plant to their pupation site below ground. We show that JH/PTTH cascade controls the phototaxis switch, through a step in photo transduction between the photoreceptor molecule and the transient receptor potential cation channel.

Ontogenetic niche shifts and their implications for recruitment in three clonal Vaccinium shrubs: Vaccinium myrtillus, Vaccinium vitis-idaea, and Vaccinium oxycoccos

2002 ◽  
Vol 80 (6) ◽  
pp. 635-641 ◽  
Author(s):  
Ove Eriksson
Keyword(s):  
Negative Relationship ◽  
Plant Ecology ◽  
Vaccinium Myrtillus ◽  
Niche Shift ◽  
Ontogenetic Niche Shifts ◽  
Ontogenetic Niche Shift ◽  
Niche Shifts ◽  
Recruitment Behavior ◽  
Species Recruitment ◽  
Ontogenetic Niche

Ontogenetic niche shifts, i.e., changes in niche breadth and (or) position during the life of individuals, have received rather limited attention in plant ecology. An experiment was designed to assess ontogenetic niche shifts in three clonal Vaccinium shrubs in order to examine their recruitment behavior. Seeds were sown, and juveniles transplanted, at sites along a gradient of changing occurrence of the three species. Recruitment was seed limited, varied among sites, and was correlated with juvenile survivorship. No niche shift occurred during seed to seedling stages for any of the plants. For Vaccinium myrtillus L., recruitment was not related to adult occurrence, whereas for Vaccinium oxycoccos L., recruitment was highest at the site where adults dominated. However, for both of these species, recruitment also occurred outside the range of adult occurrence. Vaccinium vitis-idaea L. exhibited a negative relationship between adult occurrence and recruitment and between adult occurrence and juvenile survivorship, indicating an ontogenetic niche shift. For V. myrtillus the results suggested an uncoupling of niche requirements of juvenile and adult stages, whereas for V. oxycoccos the results suggested a niche contraction towards the requirements for adults. Thus, the form of ontogenetic niche shifts differs among the species. These differences in niche shifts contribute to understanding dispersal and recruitment behavior of the species.Key words: clonal plants, dispersal, niche shifts, recruitment.

scholarly journals Character Displacement Through an Evolutionary Change in Ontogenetic Niche Shifts

2021 ◽  
Author(s):  
Jaime Anaya-Rojas ◽  
Ronald Bassar ◽  
Blake Matthews ◽  
Joshua Goldberg ◽  
David Reznick ◽  
...  
Keyword(s):  
Body Size ◽  
Poecilia Reticulata ◽  
Character Displacement ◽  
Trophic Niche ◽  
Niche Shift ◽  
Ontogenetic Niche Shifts ◽  
Ontogenetic Niche Shift ◽  
Significant Difference ◽  
Niche Shifts ◽  
Ontogenetic Niche

In communities structured by body size, coexistence can occur through combinations of ontogenetic changes in competitive ability and dietary niche. Using stable isotopes, we examined ontogenetic niche shifts in Trinidadian guppies (Poecilia reticulata) and killifish (Rivulus hartii) in three types of natural communities (both species with predators, KGP; both without predators, KG; killifish only, KO) and four experimental KG communities, initiated with KGP guppies and KO killifish between 13 and 45 years ago. In all communities, killifish occupied higher trophic positions and changed their diet (δ^13 C) with body size. Only KGP guppies displayed an ontogenetic niche shift. The KG guppies displayed a significant difference in trophic niche from KGP guppies, a character displacement that can facilitate coexistence with killifish. In the experimental communities, the guppy trophic niche was intermediate between those in KGP and KG communities, indicating that evolution has driven the niche shift in KG guppies.

Alligator appendicular architecture across an ontogenetic niche shift

2021 ◽  
Author(s):  
Brandon P. Hedrick ◽  
Emma R. Schachner ◽  
Peter Dodson
Keyword(s):  
Niche Shift ◽  
Ontogenetic Niche Shift ◽  
Ontogenetic Niche
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