scholarly journals Unexpected mosaic distribution of two hybridizing sibling lineages in the teleplanically dispersing snail Stramonita haemastoma suggests unusual postglacial redistribution or cryptic invasion

2017 ◽  
Vol 7 (21) ◽  
pp. 9016-9026 ◽  
Author(s):  
Tahani El Ayari ◽  
Najoua Trigui El Menif ◽  
Carlos Saavedra ◽  
David Cordero ◽  
Frédérique Viard ◽  
...  
Keyword(s):  
Cryptic Invasion ◽  
Stramonita Haemastoma ◽  
Mosaic Distribution

scholarly journals Imposex in endemic volutid from Northeast Brazil (Mollusca: Gastropoda)

2008 ◽  
Vol 51 (5) ◽  
pp. 1065-1069 ◽  
Author(s):  
Ítalo Braga de Castro ◽  
Carlos Augusto Oliveira de Meirelles ◽  
Helena Matthews-Cascon ◽  
Cristina de Almeida Rocha-Barreira ◽  
Pablo Penchaszadeh ◽  
...  
Keyword(s):  
First Record ◽  
Reproductive Organs ◽  
Organotin Compounds ◽  
Northeast Brazil ◽  
Gastropod Species ◽  
Antifouling Paints ◽  
Tin Compounds ◽  
Stramonita Haemastoma ◽  
Mollusk Species ◽  
Female Reproductive Organs

Imposex is characterized by the development of masculine sexual organs in neogastropod females. Almost 120 mollusk species are known to present imposex when exposed to organic tin compounds as tributyltin (TBT) and triphenyltin (TPT). These compounds are used as biocide agents in antifouling paints to prevent the incrustations on boats. Five gastropod species are known to present imposex in Brazil: Stramonita haemastoma, Stramonita rustica, Leucozonia nassa, Cymathium parthenopeum and Olivancillaria vesica. This paper reports the first record of imposex observed in the endemic gastropod Voluta ebraea from Pacheco Beach, Northeast Brazil. Animals presenting imposex had regular female reproductive organs (capsule gland, oviduct and sperm-ingesting gland) and an abnormal penis. As imposex occurs in mollusks exposed to organotin compounds typically found at harbors, marinas, shipyards and areas with high shipping activities, probably contamination of Pacheco Beach is a consequence of a shipyard activity located in the nearest areas.

scholarly journals Efecto del impacto antrópico sobre la distribución de Stramonita haemastoma (Linnaeus 1766) (Gastropoda: Muricidae) en la costa norte de Tenerife

2018 ◽  
pp. 13-22
Author(s):  
Elsa Cuende ◽  
Sara González-Delgado ◽  
María L. García ◽  
Claudia Pich ◽  
María Rodríguez ◽  
...  
Keyword(s):  
Stramonita Haemastoma

scholarly journals Organotin pollution from pleasure craft at Paraty, a tourist area of Southeastern Brazil: amelioration or interference?

2013 ◽  
Vol 61 (3) ◽  
pp. 177-186 ◽  
Author(s):  
Camila de Leon Lousada Borges ◽  
Marcos Antonio dos Santos Fernandez ◽  
Ítalo Braga Castro ◽  
Gilberto Fillmann
Keyword(s):  
Organic Carbon ◽  
Chemical Analysis ◽  
Dissolved Organic Carbon ◽  
Endocrine Disruptors ◽  
Marine Ecosystems ◽  
Southeastern Brazil ◽  
Reference Sites ◽  
Mangrove Swamp ◽  
Small Vessels ◽  
Stramonita Haemastoma

Some organotin compounds, such as TBT, are endocrine disruptors and harm marine ecosystems. Even after the global ban on organotins, increasing imposex levels have been detected in Stramonita haemastoma analyzed in 2004 and 2011 in some locations at Paraty, a tourist area in southeastern Brazil. The results of this study indicate that particulate and dissolved organic carbon and xenoestrogens might be interfering in this syndrome's development, leading to underestimation of imposex evaluation. Chemical analysis of three mangrove swamp sediments in the area showed the presence of TBT (16.0 - 205.7 ng Sn g-1), DBT (10.1 - 16.4 ng Sn g-1) and MBT (10.1 - 10.2 ng Sn g-1) even at the reference sites. The concentrations of butyltins and the increased incidence of imposexat some stations indicate recent inputs of TBT in the study area due to its illegal use on small vessels.

scholarly journals The role of organic matter in formation of the properties of a shale deposit

2019 ◽  
Vol 484 (2) ◽  
pp. 220-223
Author(s):  
И. Ф. Юсупова
Keyword(s):  
Organic Matter ◽  
Carbonate Rocks ◽  
Strength Properties ◽  
Low Density ◽  
Lower Strength ◽  
Reduction Processes ◽  
Local Areas ◽  
Oil Shales ◽  
Mosaic Distribution

Baltic oil shales — kukersites were studied as an example of rocks with rock-forming organic matter (OM). The volumetric significance of their OM is shown (due to the low density) in the volume and thickness of the shale layers. A higher OM content is responsible for a lower strength of the shales relative to the carbonate rocks of the deposit. The variable OM contents and other heterogeneities of the shale layers (structure, nodules, etc.) are factors of the mosaic distribution of areas with different density–strength properties and, as a result, of uneven reduction of layers and their deformation in the case of OM loss (full or partial). It is concluded that the intercalation of kukersite and limestone layers leads to density and strength anisotropy of the shale deposit. Episodic loss of OM and carbonates by the shales is considered for the local areas of the deposit: here, kukersites contain only a terrigenous component with clasts of limestones, shales, and epigenetic sulfides. The loss of OM is explained by sulfate-reduction processes in the underground hydrosphere.

scholarly journals High thermal tolerance does not protect from chronic warming – A multiple end-point approach using a tropical gastropod, Stramonita haemastoma

2018 ◽  
Vol 91 ◽  
pp. 626-635 ◽  
Author(s):  
Carolina Madeira ◽  
Vanessa Mendonça ◽  
Augusto A.V. Flores ◽  
Mário S. Diniz ◽  
Catarina Vinagre
Keyword(s):  
Thermal Tolerance ◽  
End Point ◽  
Stramonita Haemastoma

scholarly journals Sugarcane Mosaic Distribution, Incidence, Increase, and Spatial Pattern in Louisiana

Plant Disease ◽  
2019 ◽  
Vol 103 (8) ◽  
pp. 2051-2056
Author(s):  
J. L. Rice ◽  
J. W. Hoy ◽  
M. P. Grisham
Keyword(s):  
Spatial Pattern ◽  
Disease Incidence ◽  
Aphid Transmission ◽  
Field Surveys ◽  
Reverse Transcription Pcr ◽  
Single Leaf ◽  
Disease Surveys ◽  
Low Incidence ◽  
Mosaic Distribution ◽  
Production Areas

Sugarcane mosaic is a historically important disease in Louisiana currently caused by sorghum mosaic virus (SrMV). Successful breeding for resistance reduced the disease to low incidence in commercial cultivars. However, mosaic was detected in experimental clone evaluations at multiple locations, leading to uncertainty concerning the current distribution and incidence in the state. Field surveys were conducted from 2016 to 2018 in breeding program yield trials and experimental clone seed cane increase fields. Mosaic symptomatic plants were observed in a newly released cultivar, HoCP 09-804, in three of five production areas, with incidences ranging from 0 to 10%. Mosaic also was observed in nine additional experimental clones. Single leaf samples were tested for SrMV using reverse transcription PCR. All symptomatic samples and a low percentage (0.3%) of asymptomatic samples tested positive for SrMV, confirming that it continues to be the causal species. Runs analysis detected aggregation of infected plants within at least 70% of rows in 94% of surveyed fields. The spatial pattern and geographical distribution of disease incidence suggested that infected seed cane was the source of the disease. Surveys conducted in the same fields of HoCP 09-804 through two subsequent crops detected disease incidence increases in some fields and decreases in the others in first ratoon, but observed incidence was lower compared with plant cane in all fields in second ratoon. The results indicated that disease increase owing to aphid transmission did not occur under the prevailing conditions.

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