The Experts below are selected from a list of 156 Experts worldwide ranked by ideXlab platform
Antoine Lecerf - One of the best experts on this subject based on the ideXlab platform.
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small stonefly predators affect microbenthic and meiobenthic communities in stream leaf packs
Freshwater Biology, 2015Co-Authors: Nabil Majdi, Walte Traunspurge, Joh S Richardso, Antoine LecerfAbstract:Summary Predators affect benthic communities and ecological processes through consuming and scaring prey as well as through engineering effects on the habitat. Experimental evidence of top–down predatory effects in leaf packs comes from studies assessing how large predators affect shredders and therefore the litter decomposition rate. In this study, we investigated the effects of smaller invertebrate predators on micro- and meiobenthic communities. In outdoor, flow-through stream channels, we created a gradient in the density of predacious Chloroperlidae stonefly larvae in enclosures containing alder leaf litter and exposed to natural colonisation by invertebrates and decomposers. We expected that: (i) predators would reduce the biomass and density of invertebrate colonisers, (ii) the strength of predator effects on invertebrates would vary with prey body size; and (iii) increasing predator numbers in enclosures would diminish the per capita strength of predator–prey interactions due to intraguild interference. We also anticipated that litter decomposition would be slower in the presence of predators providing that microbial decomposers did not compensate for the reduction in shredders by an increase in their biomass. Chloroperlidae had negative effects on the biomass of most major invertebrate taxa, including rotifers, nematodes and larvae of the Chironomidae Corynoneura and Brillia (the dominant shredder in leaf packs). The predatory effect on nematode biomass was strongest for dominant small-bodied species. Fungal biomass in leaf litter was reduced in the presence of predators, whereas bacterial biomass was not affected. In addition to feasible direct predation on Chironomidae, Chloroperlidae apparently inhibited meiofauna colonisation of leaf litter, probably through the bioturbation of fine sediment trapped on leaf surfaces. At the end of the experiment, the mortality of Chloroperlidae in enclosures was considerable at the highest predator density treatment. This observation, along with evidence of the reduced per capita strength of predator–prey interactions with increasing predator density, suggested that intraguild interference moderates the effect of predators in leaf packs. Our findings are consistent with a key role of small predators in determining the abundance of invertebrates and microbial decomposers in leaf packs. However, in our study, there was no cascade down to the standing stock of leaf litter.
Nabil Majdi - One of the best experts on this subject based on the ideXlab platform.
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small stonefly predators affect microbenthic and meiobenthic communities in stream leaf packs
Freshwater Biology, 2015Co-Authors: Nabil Majdi, Walte Traunspurge, Joh S Richardso, Antoine LecerfAbstract:Summary Predators affect benthic communities and ecological processes through consuming and scaring prey as well as through engineering effects on the habitat. Experimental evidence of top–down predatory effects in leaf packs comes from studies assessing how large predators affect shredders and therefore the litter decomposition rate. In this study, we investigated the effects of smaller invertebrate predators on micro- and meiobenthic communities. In outdoor, flow-through stream channels, we created a gradient in the density of predacious Chloroperlidae stonefly larvae in enclosures containing alder leaf litter and exposed to natural colonisation by invertebrates and decomposers. We expected that: (i) predators would reduce the biomass and density of invertebrate colonisers, (ii) the strength of predator effects on invertebrates would vary with prey body size; and (iii) increasing predator numbers in enclosures would diminish the per capita strength of predator–prey interactions due to intraguild interference. We also anticipated that litter decomposition would be slower in the presence of predators providing that microbial decomposers did not compensate for the reduction in shredders by an increase in their biomass. Chloroperlidae had negative effects on the biomass of most major invertebrate taxa, including rotifers, nematodes and larvae of the Chironomidae Corynoneura and Brillia (the dominant shredder in leaf packs). The predatory effect on nematode biomass was strongest for dominant small-bodied species. Fungal biomass in leaf litter was reduced in the presence of predators, whereas bacterial biomass was not affected. In addition to feasible direct predation on Chironomidae, Chloroperlidae apparently inhibited meiofauna colonisation of leaf litter, probably through the bioturbation of fine sediment trapped on leaf surfaces. At the end of the experiment, the mortality of Chloroperlidae in enclosures was considerable at the highest predator density treatment. This observation, along with evidence of the reduced per capita strength of predator–prey interactions with increasing predator density, suggested that intraguild interference moderates the effect of predators in leaf packs. Our findings are consistent with a key role of small predators in determining the abundance of invertebrates and microbial decomposers in leaf packs. However, in our study, there was no cascade down to the standing stock of leaf litter.
Ying Wang - One of the best experts on this subject based on the ideXlab platform.
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The first mitochondrial genome from Scopuridae (Insecta: Plecoptera) reveals structural features and phylogenetic implications.
International journal of biological macromolecules, 2018Co-Authors: Ying Wang, Jinjun CaoAbstract:Abstract This study determined the first complete mitochondrial genome (mitogenome) of a stonefly, Scopura longa (Plecoptera: Scopuridae), and reconstructed a phylogeny based on two datasets of mitogenomes in eighteen available stoneflies to examine the relationships among Plecoptera. The complete mitogenome of S. longa is a circular molecule of 15,798 bp in size. It contains 13 protein-coding genes (PCGs), 22 transfer RNA genes (tRNAs), two ribosomal RNA genes (rRNAs) and a control region (CR). Most PCGs used standard ATN start codons and TAN stop codons. All tRNAs could be folded as typical cloverleaf secondary structures except tRNASer(AGN), with the dihydrouridine (DHU) arm missing. Tandem repeat regions, two potential stem-loop (SL) structures, Poly T structures and G + C-rich regions are detected in the control region. Finally, the phylogenetic relationships among the families within the Arctoperlaria were reconstructed. The topological structures of the two trees were almost identical. The present phylogenetic analysis shows that S. longa belongs to the infraorder Euholognatha. The monophyly of each family is generally well supported based on nucleotide sequences. The Pteronarcyidae is sister to ((Peltoperlidae + Styloperlidae) + (Perlidae + (Perlodidae + Chloroperlidae))).
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Comparison of two complete mitochondrial genomes from Perlodidae (Plecoptera: Perloidea) and the family-level phylogenetic implications of Perloidea.
Gene, 2018Co-Authors: Ying Wang, Jinjun Cao, Dávid MurányiAbstract:To obtain a better understanding of the mitochondrial genome in Perlodidae and the phylogeny of Perloidea, we sequenced two perlodid mitochondrial genomes and present comparative analyses in the family Perlodidae. Our results show that genome organization, base composition, codon usage and non-coding and overlapping regions, the sequences of mitochondrial transcription termination factor (DmTTF) and structural elements in control region were conserved in Perlodidae. The unique non-coding regions in COI-trnL2 and trnL2-COII were present in Perlodidae but were incomplete or absent from other stoneflies, and we also discuss the conservative property of the sequences between trnE and trnF, trnS1 and ND1. The secondary structure of tRNAs showed that the trnK, trnP, trnS1 and trnW were identical and the trnS1 could not be folded into typical secondary structure due to its absence of DHU arm. Phylogenetic implications supported that Chloroperlidae is a sister group to Perlodidae and the Perlidae is a sister group to the clade Chloroperlidae + Perlodidae. This study contributes to understanding the comparative mitogenomic analysis of Perlodidae and phylogenetic relationships within the Perloidea.
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Complete Mitochondrial Genome of Suwallia teleckojensis (Plecoptera: Chloroperlidae) and Implications for the Higher Phylogeny of Stoneflies
International Journal of Molecular Sciences, 2018Co-Authors: Ying Wang, Weihai LiAbstract:Stoneflies comprise an ancient group of insects, but the phylogenetic position of Plecoptera and phylogenetic relations within Plecoptera have long been controversial, and more molecular data is required to reconstruct precise phylogeny. Herein, we present the complete mitogenome of a stonefly, Suwallia teleckojensis, which is 16146 bp in length and consists of 13 protein-coding genes (PCGs), 2 ribosomal RNAs (rRNAs), 22 transfer RNAs (tRNAs) and a control region (CR). Most PCGs initiate with the standard start codon ATN. However, ND5 and ND1 started with GTG and TTG. Typical termination codons TAA and TAG were found in eleven PCGs, and the remaining two PCGs (COII and ND5) have incomplete termination codons. All transfer RNA genes (tRNAs) have the classic cloverleaf secondary structures, with the exception of tRNASer(AGN), which lacks the dihydrouridine (DHU) arm. Secondary structures of the two ribosomal RNAs were shown referring to previous models. A large tandem repeat region, two potential stem-loop (SL) structures, Poly N structure (2 poly-A, 1 poly-T and 1 poly-C), and four conserved sequence blocks (CSBs) were detected in the control region. Finally, both maximum likelihood (ML) and Bayesian inference (BI) analyses suggested that the Capniidae was monophyletic, and the other five stonefly families form a monophyletic group. In this study, S. teleckojensis was closely related to Sweltsa longistyla, and Chloroperlidae and Perlidae were herein supported to be a sister group.
Zhi-teng Chen - One of the best experts on this subject based on the ideXlab platform.
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Molecular phylogeny of Systellognatha (Plecoptera: Arctoperlaria) inferred from mitochondrial genome sequences
International journal of biological macromolecules, 2018Co-Authors: Zhi-teng Chen, Meng-yuan ZhaoAbstract:Abstract The infraorder Systellognatha is the most species-rich clade in the insect order Plecoptera and includes six families in two superfamilies: Pteronarcyoidea (Pteronarcyidae, Peltoperlidae, and Styloperlidae) and Perloidea (Perlidae, Perlodidae, and Chloroperlidae). To resolve the debatable phylogeny of Systellognatha, we carried out the first mitochondrial phylogenetic analysis covering all the six families, including three newly sequenced mitogenomes from two families (Perlodidae and Peltoperlidae) and 15 published mitogenomes. The three newly reported mitogenomes share conserved mitogenomic features with other sequenced stoneflies. For phylogenetic analyses, we assembled five datasets with two inference methods to assess their influence on topology and nodal support within Systellognatha. The results indicated that inclusion of the third codon positions of PCGs, exclusion of rRNA genes, the use of nucleotide datasets and Bayesian inference could improve the phylogenetic reconstruction of Systellognatha. The monophyly of Perloidea was supported in the mitochondrial phylogeny, but Pteronarcyoidea was recovered as paraphyletic and remained controversial. In this mitochondrial phylogenetic study, the relationships within Systellognatha were recovered as (((Perlidae + (Perlodidae + Chloroperlidae)) + (Pteronarcyidae + Styloperlidae)) + Peltoperlidae).
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The first two mitochondrial genomes from Taeniopterygidae (Insecta: Plecoptera): Structural features and phylogenetic implications.
International Journal of Biological Macromolecules, 2017Co-Authors: Zhi-teng Chen, Yuzhou DuAbstract:Abstract The complete mitochondrial genomes (mitogenomes) of Taeniopteryx ugola and Doddsia occidentalis (Plecoptera: Taeniopterygidae) were firstly sequenced from the family Taeniopterygidae. The 15,353-bp long mitogenome of T. ugola and the 16,020-bp long mitogenome of D. occidentalis each contained 37 genes including 13 protein-coding genes (PCGs), 22 transfer RNA genes (tRNAs), two ribosomal RNA genes (rRNAs) and a control region (CR). The mitochondrial gene arrangement of the two taeniopterygids and other stoneflies was identical with the putative ancestral mitogenome of Drosophila yakuba. Most PCGs used standard ATN start codons and TAN termination codons. Twenty-one of the 22 tRNAs in each mitogenome could fold into the cloverleaf secondary structures, while the dihydrouridine (DHU) arm of trnSer (AGN) was reduced or absent. Stem-loop (SL) structures, poly-T stretch, poly-[AT]n stretch and tandem repeats were found in the CRs of the two mitogenomes. The phylogenetic analyses using Bayesian inference (BI) and maximum likelihood methods (ML) generated identical results, both supporting the monophyly of all stonefly families and the two infraorders, Systellognatha and Euholognatha. Taeniopterygidae was grouped with another two families from Euholognatha. The relationships within Plecoptera were recovered as (((Perlidae + Peltoperlidae) + ((Pteronarcyidae + Chloroperlidae) + Styloperlidae)) + ((Capniidae + Taeniopterygidae) + Nemouridae)) + Gripopterygidae.
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A new species of Sweltsa (Plecoptera: Chloroperlidae) from China, with a key to the Sweltsa males of China
2017Co-Authors: Zhi-teng ChenAbstract:Zhi-Teng Chen, Yu-Zhou Du (2017): A new species of Sweltsa (Plecoptera: Chloroperlidae) from China, with a key to the Sweltsa males of China. Zootaxa 4337 (2): 291-293, DOI: https://doi.org/10.11646/zootaxa.4337.2.
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complete mitochondrial genome of capnia zijinshana plecoptera capniidae and phylogenetic analysis among stoneflies
Journal of Asia-pacific Entomology, 2017Co-Authors: Zhi-teng Chen, Yuzhou DuAbstract:Abstract The complete mitochondrial genome (mitogenome) of the winter stonefly, Capnia zijinshana (Plecoptera: Capniidae), was sequenced and compared with other stoneflies. The mitogenome of C. zijinshana is 16,310 bp long and contains 37 genes including 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA) genes, and a control region (CR). The gene arrangement of C. zijinshana and other 12 stonefly mitogenomes is identical with the putative ancestral mitogenome in Drosophila yakuba. Twenty-one of the 22 tRNAs in the C. zijinshana mitogenome could be folded into the typical cloverleaf secondary structure, while the dihydrouridine (DHU) arm of trnS (AGN) was missing. The 1513-bp control region of C. zijinshana contained two potential stem-loop structures and a tandem repeat region. The phylogenetic relationships of 13 species from Plecoptera were analyzed based on the nucleotide sequences of 13 PCGs. The phylogenetic relationships among 13 stoneflies and two mayflies were inferred by Bayesian inference and maximum likelihood methods. C. zijinshana was grouped with another two winter stoneflies, Mesocapnia arizonensis and Apteroperla tikumana. The two analyses both supported the close relationship of Pteronarcyidae and Chloroperlidae, and also supported the sister-group relationship of Styloperlidae and Perlidae.
Yuzhou Du - One of the best experts on this subject based on the ideXlab platform.
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The Mitochondrial Genome of Leuctra Sp. (Plecoptera: Leuctridae) and Its Performance in Phylogenetic Analyses
Zootaxa, 2019Co-Authors: Yue Shen, Yuzhou DuAbstract:: The nearly complete mitochondrial genome (mitogenome) of Leuctra sp. (Plecoptera: Leuctridae) was sequenced. The 14,585-bp long mitogenome of L. sp. contained 37 genes including 13 protein-coding genes (PCGs), 22 transfer RNA genes (tRNAs), two ribosomal RNA genes (rRNAs), and a control region (CR). The mitochondrial gene arrangement of L. sp. was identical with other stoneflies and the putative ancestral mitogenome of Drosophila yakuba Burla. Most PCGs used standard ATN start codons and TAN termination codons. Twenty-one of the 22 tRNAs in each mitogenome exhibited the cloverleaf secondary structures, while the dihydrouridine (DHU) arm of trnSer (AGN) was reduced. Phylogenetic analyses using our new Leuctra sp. genome and all other publicly available genomes for Plecoptera and Bayesian inference (BI) and maximum likelihood methods (ML) generated identical topologies, both supporting the monophyly of all stonefly families for which tests were possible and the infraorder Systellognatha. Scopuridae and Gripopterygidae were grouped with the infraorder Euholognatha. The final relationships within Plecoptera were recovered as (((((Perlodidae + Chloroperlidae) + Perlidae) + Pteronarcyidae) + Peltoperlidae) + Styloperlidae) + (((((Capniidae + Taeniopterygidae) + Nemouridae) + Scopuridae) + Leuctridae) + Gripopterygidae).
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The first two mitochondrial genomes from Taeniopterygidae (Insecta: Plecoptera): Structural features and phylogenetic implications.
International Journal of Biological Macromolecules, 2017Co-Authors: Zhi-teng Chen, Yuzhou DuAbstract:Abstract The complete mitochondrial genomes (mitogenomes) of Taeniopteryx ugola and Doddsia occidentalis (Plecoptera: Taeniopterygidae) were firstly sequenced from the family Taeniopterygidae. The 15,353-bp long mitogenome of T. ugola and the 16,020-bp long mitogenome of D. occidentalis each contained 37 genes including 13 protein-coding genes (PCGs), 22 transfer RNA genes (tRNAs), two ribosomal RNA genes (rRNAs) and a control region (CR). The mitochondrial gene arrangement of the two taeniopterygids and other stoneflies was identical with the putative ancestral mitogenome of Drosophila yakuba. Most PCGs used standard ATN start codons and TAN termination codons. Twenty-one of the 22 tRNAs in each mitogenome could fold into the cloverleaf secondary structures, while the dihydrouridine (DHU) arm of trnSer (AGN) was reduced or absent. Stem-loop (SL) structures, poly-T stretch, poly-[AT]n stretch and tandem repeats were found in the CRs of the two mitogenomes. The phylogenetic analyses using Bayesian inference (BI) and maximum likelihood methods (ML) generated identical results, both supporting the monophyly of all stonefly families and the two infraorders, Systellognatha and Euholognatha. Taeniopterygidae was grouped with another two families from Euholognatha. The relationships within Plecoptera were recovered as (((Perlidae + Peltoperlidae) + ((Pteronarcyidae + Chloroperlidae) + Styloperlidae)) + ((Capniidae + Taeniopterygidae) + Nemouridae)) + Gripopterygidae.
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complete mitochondrial genome of capnia zijinshana plecoptera capniidae and phylogenetic analysis among stoneflies
Journal of Asia-pacific Entomology, 2017Co-Authors: Zhi-teng Chen, Yuzhou DuAbstract:Abstract The complete mitochondrial genome (mitogenome) of the winter stonefly, Capnia zijinshana (Plecoptera: Capniidae), was sequenced and compared with other stoneflies. The mitogenome of C. zijinshana is 16,310 bp long and contains 37 genes including 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA) genes, and a control region (CR). The gene arrangement of C. zijinshana and other 12 stonefly mitogenomes is identical with the putative ancestral mitogenome in Drosophila yakuba. Twenty-one of the 22 tRNAs in the C. zijinshana mitogenome could be folded into the typical cloverleaf secondary structure, while the dihydrouridine (DHU) arm of trnS (AGN) was missing. The 1513-bp control region of C. zijinshana contained two potential stem-loop structures and a tandem repeat region. The phylogenetic relationships of 13 species from Plecoptera were analyzed based on the nucleotide sequences of 13 PCGs. The phylogenetic relationships among 13 stoneflies and two mayflies were inferred by Bayesian inference and maximum likelihood methods. C. zijinshana was grouped with another two winter stoneflies, Mesocapnia arizonensis and Apteroperla tikumana. The two analyses both supported the close relationship of Pteronarcyidae and Chloroperlidae, and also supported the sister-group relationship of Styloperlidae and Perlidae.