ELIMINATION AND CONTROL OF AQUATIC PESTS IN THE ENVIRONMENT

The present paper is a brief review of possible methods that can be used to control or eliminate aquatic pests from the environment, with particular emphasis on the golden mussel, Limnoperna fortunei (Dunker 1856). This bivalve mollusk, a native of Southeast Asia, has infested most of the rivers in Northern Argentina, Uruguay, Paraguay, and Southern Brazil and is causing serious environmental difficulties and biofouling. In addition, it causes serious problems to water treatment stations and hydroelectric power plants.

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Gonad transcriptome of golden mussel Limnoperna fortunei reveals potential sex differentiation genes

10.1101/818757 ◽

2019 ◽

Cited By ~ 2

Author(s):

Luana Ferreira Afonso ◽

Juliana Alves Americo ◽

Giordano Bruno Soares-Souza ◽

André Luiz Quintanilha Torres ◽

Inês Julia Ribas Wajsenzon ◽

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Keyword(s):

Power Plants ◽

Expression Profiles ◽

Sex Differentiation ◽

Differential Expression Analysis ◽

Gene Families ◽

Economic Damage ◽

Hydroelectric Power ◽

Limnoperna Fortunei ◽

Related Transcription Factor ◽

Golden Mussel

The golden mussel Limnoperna fortunei is an Asian invasive bivalve that threats aquatic biodiversity and causes economic damage, especially to the hydroelectric sector in South America. Traditional control methods have been inefficient to stop the advance of the invasive mollusk, which currently is found in 40% of Brazilian hydroelectric power plants. In order to develop an effective strategy to stop golden mussel infestations, we need to better understand its reproductive and sexual mechanisms. In this study, we sequenced total RNA samples from male and female golden mussel gonads in the spawning stage. A transcriptome was assembled resulting in 200,185 contigs with 2,250 bp N50 and 99.3% completeness. Differential expression analysis identified 3,906 differentially expressed transcripts between the sexes. We searched for genes related to the sex determination/differentiation pathways in bivalves and model species and investigated their expression profiles in the transcriptome of the golden mussel gonads. From a total of 187 genes identified in the literature, 131 potential homologs were found in the L. fortunei transcriptome, of which 15 were overexpressed in males and four in females. To this group belong gene families relevant to sexual development in various organisms, from mammals to invertebrates, such as Dmrt (doublesex and mab3-related-transcription factor), Sox (SRY-related HMG-box) and Fox (forkhead box).

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Acanthoceras and Urosolenia species (Diatomeae) in subtropical reservoirs from South Brazil: Ultrastructure, distribution and autoecology

Biota Neotropica ◽

10.1590/1676-06032014004314 ◽

2015 ◽

Vol 15 (1) ◽

Cited By ~ 3

Author(s):

Priscila Izabel Tremarin ◽

Eduardo Gomes Freire ◽

Vanessa Majewski Algarte ◽

Thelma Veiga Ludwig

Keyword(s):

Power Plants ◽

Environmental Gradients ◽

Inorganic Nitrogen ◽

Similar Species ◽

Hydroelectric Power ◽

Strong Correlations ◽

Southern Brazil ◽

Hydroelectric Power Plants ◽

Nitrogen Concentrations ◽

South Brazil

Acanthoceras Honigmann and Urosolenia Round & Crawford emend. Rott, Kling & McGregor species were studied based on samples of 19 hydroelectric power plants reservoirs located in the State of Paraná, Southern Brazil. Autoecological informations of Urosolenia species complement the study. One Acanthoceras and four Urosolenia species were identified: A. zachariasii (Brun) Simonsen, U. amazonica Sala, Núãez-Avellaneda & Vouilloud, U. eriensis var. morsa (West & G.S.West) Bukhtiyarova, U. longiseta Zacharias and U. obesa Freire, Tremarin & Ludwig. Morphological variation of frustules was described and illustrated by optical and scanning electron microscopy, and compared with similar species such as U. delicatissima Sala, Núãez-Avellaneda & Vouilloud and U. eriensis var. eriensis (H.L.Smith) Round & Crawford. The pioneer record of U. amazonica to Brazil and unprecedent details of the ultrastructure of A. zachariasii and U. longiseta are included in this study. Cellular densities differed among evaluated reservoirs showing strong correlations with inorganic nitrogen concentrations, N/P ratio and temperature. The results suggested higher densities in periods of warmer temperatures and low availability of the nitrogen compounds and confirmed that species respond strongly to local environmental gradients.

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