First Records of the Invading Species Drosophila Nasuta (Diptera: Drosophilidae) in the Amazon

2022 ◽  
Author(s):  
Hermes Fonseca de Medeiros ◽  
Márcia Pereira Monteiro ◽  
Antônio Wesley Barros Caçador ◽  
Camila Miranda Pereira ◽  
Catarina de Lurdes Bezerra Praxedes ◽  
...  
Keyword(s):  
Invading Species ◽  
Drosophila Nasuta

Geographic expansion and dominance of the invading species Drosophila nasuta (Diptera, Drosophilidae) in Brazil

2020 ◽  
Vol 24 (3) ◽  
pp. 525-534
Author(s):  
Danubia Guimarães Silva ◽  
Hermes José Schmitz ◽  
Hermes Fonseca de Medeiros ◽  
Cláudia Rohde ◽  
Martín Alejandro Montes ◽  
...  
Keyword(s):  
Invading Species ◽  
Geographic Expansion ◽  
Drosophila Nasuta

The early stages of spontaneous forest regeneration on poor soils and continental sand dunes in northern Belgium

1983 ◽  
Vol 49 ◽  
Author(s):  
M. Van Miegroet
Keyword(s):  
Scots Pine ◽  
Age Differences ◽  
Forest Regeneration ◽  
Sand Dunes ◽  
Mixed Forest ◽  
Pedunculate Oak ◽  
White Poplar ◽  
Technical Problems ◽  
Homogeneous Groups ◽  
Invading Species

Spontaneous  natural regeneration under variable conditions on sandy soils and continental  sand dunes were analysed in 5 locations in N.E. Belgium.     The number of seedlings varies between 14.000 and 522.000/ha. The most  prominent invading species are red oak, pedunculate oak and Scots pine.    Two principal types of regeneration are recognized : homogeneous groups of  oak or pine and mixtures, predominantly composed by the same species.  Pioneers such as birch, willow, white poplar and wild black cherry do not  play an important role.    Social differentiation sets in quite early and is mainly provoked by age  differences. Therefore early silvicultural intervention is advisable. The  growth relationships between the species indicate that Scots pine is not in  danger of spontaneous elemination by other species. Because of the density  and variability of spontaneous forest regeneration, the conversion of pure  pine stands into mixed forest, using group regeneration to this end, poses no  real technical problems.

scholarly journals Separating sources of density-dependent and density-independent establishment limitation in invading species

2016 ◽  
Vol 105 (2) ◽  
pp. 436-444 ◽  
Author(s):  
Erica N. Spotswood ◽  
Pierre Mariotte ◽  
Emily C. Farrer ◽  
Liana Nichols ◽  
Katharine N. Suding
Keyword(s):  
Density Dependent ◽  
Invading Species

Aquatic Biofilms and Their Responses to Disinfection and Invading Species

1992 ◽  
Author(s):  
G. A. Smithers ◽  
E. B. Rodgers ◽  
D. C. Obenhuber ◽  
T. L. Huff
Keyword(s):  
Invading Species

scholarly journals The speciation history of the Drosophila nasuta complex

2006 ◽  
Vol 88 (1) ◽  
pp. 13-26 ◽  
Author(s):  
DORIS BACHTROG
Keyword(s):  
Genetic Differentiation ◽  
Population Genetic ◽  
Species Group ◽  
Similar Species ◽  
Nucleotide Polymorphisms ◽  
Effective Population ◽  
Genetic Analyses ◽  
Nucleotide Variability ◽  
Drosophila Nasuta ◽  
Population Genetic Analyses

The Drosophila nasuta subgroup of the immigrans species group is widely distributed throughout the South-East Asian region, consisting of morphologically similar species with varying degrees of reproductive isolation. Here, I report nucleotide variability data for five X-linked and two mtDNA loci in eight taxa from the nasuta subgroup, with deeper sampling from D. albomicans and its sister species D. nasuta. Phylogenetic relationships among these species vary among different genomic regions, and levels of genetic differentiation suggest that this species group diversified only about one million years ago. D. albomicans and D. nasuta share nucleotide polymorphisms and are distinguished by relatively few fixed differences. Patterns of genetic differentiation between this species pair are compatible with a simple isolation model with no gene flow. Nucleotide variability levels of species in the nasuta group are comparable to those in members of the melanogaster and pseudoobscura species groups, indicating effective population sizes on the order of several million. Population genetic analyses reveal that summaries of the frequency distribution of neutral polymorphisms in both D. albomicans and D. nasuta generally fit the assumptions of the standard neutral model. D. albomicans is of particular interest for evolutionary studies because of its recently formed neo-sex chromosomes, and our phylogenetic and population genetic analyses suggest that it might be an ideal model to study the very early stages of Y chromosome evolution.

scholarly journals Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain

2003 ◽  
Vol 63 (2) ◽  
pp. 177-182 ◽  
Author(s):  
C. S. Agostinho ◽  
N. S. Hahn ◽  
E. E. Marques
Keyword(s):  
Resource Use ◽  
Native Species ◽  
Feeding Strategy ◽  
Food Resource ◽  
Paraná River ◽  
Activity Period ◽  
Parana River ◽  
Invading Species ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River

Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments) and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05), with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.

scholarly journals Evolution of Invasion in a Diverse Set of Fusobacterium Species

mBio ◽  
2014 ◽  
Vol 5 (6) ◽  
Author(s):  
Abigail Manson McGuire ◽  
Kyla Cochrane ◽  
Allison D. Griggs ◽  
Brian J. Haas ◽  
Thomas Abeel ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Preterm Birth ◽  
Host Cell ◽  
Cell Invasion ◽  
Unknown Function ◽  
Host Cells ◽  
Host Cell Invasion ◽  
Whole Genome ◽  
Large Expansion ◽  
Invading Species

ABSTRACTThe diverseFusobacteriumgenus contains species implicated in multiple clinical pathologies, including periodontal disease, preterm birth, and colorectal cancer. The lack of genetic tools for manipulating these organisms leaves us with little understanding of the genes responsible for adherence to and invasion of host cells. Actively invadingFusobacteriumspecies can enter host cells independently, whereas passively invading species need additional factors, such as compromise of mucosal integrity or coinfection with other microbes. We applied whole-genome sequencing and comparative analysis to study the evolution of active and passive invasion strategies and to infer factors associated with active forms of host cell invasion. The evolution of active invasion appears to have followed an adaptive radiation in which two of the three fusobacterial lineages acquired new genes and underwent expansions of ancestral genes that enable active forms of host cell invasion. Compared to passive invaders, active invaders have much larger genomes, encode FadA-related adhesins, and possess twice as many genes encoding membrane-related proteins, including a large expansion of surface-associated proteins containing the MORN2 domain of unknown function. We predict a role for proteins containing MORN2 domains in adhesion and active invasion. In the largest and most comprehensive comparison of sequencedFusobacteriumspecies to date, we have generated a testable model for the molecular pathogenesis ofFusobacteriuminfection and illuminate new therapeutic or diagnostic strategies.IMPORTANCEFusobacteriumspecies have recently been implicated in a broad spectrum of human pathologies, including Crohn’s disease, ulcerative colitis, preterm birth, and colorectal cancer. Largely due to the genetic intractability of member species, the mechanisms by whichFusobacteriumcauses these pathologies are not well understood, although adherence to and active invasion of host cells appear important. We examined whole-genome sequence data from a diverse set ofFusobacteriumspecies to identify genetic determinants of active forms of host cell invasion. Our analyses revealed that actively invadingFusobacteriumspecies have larger genomes than passively invading species and possess a specific complement of genes—including a class of genes of unknown function that we predict evolved to enable host cell adherence and invasion. This study provides an important framework for future studies on the role ofFusobacteriumin pathologies such as colorectal cancer.

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