Cryopreservation of South American Neotropical Fish Sperm: Current Status

Cryobiology ◽  
2021 ◽  
Vol 103 ◽  
pp. 188
Author(s):  
Danilo Streit ◽  
Rômulo Rodrigues ◽  
Ana Carina Vasconcelos ◽  
Eduardo Sanches ◽  
Jayme Povh ◽  
...  
Keyword(s):  
Current Status ◽  
South American ◽  
Neotropical Fish ◽  
Fish Sperm

Marine parasites as biological tags in South American Atlantic waters, current status and perspectives

Parasitology ◽  
2014 ◽  
Vol 142 (1) ◽  
pp. 5-24 ◽  
Author(s):  
D. M. P. CANTATORE ◽  
J. T. TIMI
Keyword(s):  
Current Status ◽  
Future Research ◽  
Fish Stock ◽  
South American ◽  
Fish Parasite ◽  
New Paradigm ◽  
Essential Information ◽  
Fisheries Science ◽  
Ecosystem Boundaries ◽  
Biological Tags

SUMMARYMany marine fisheries in South American Atlantic coasts (SAAC) are threatened by overfishing and under serious risk of collapsing. The SAAC comprises a diversity of environments, possesses a complex oceanography and harbours a vast biodiversity that provide an enormous potential for using parasites as biological tags for fish stock delineation, a prerequisite for the implementation of control and management plans. Here, their use in the SAAC is reviewed. Main evidence is derived from northern Argentine waters, where fish parasite assemblages are dominated by larval helminth species that share a low specificity, long persistence and trophic transmission, parasitizing almost indiscriminately all available fish species. The advantages and constraints of such a combination of characteristics are analysed and recommendations are given for future research. Shifting the focus from fish/parasite populations to communities allows expanding the concept of biological tags from local to regional scales, providing essential information to delineate ecosystem boundaries for host communities. This new concept arose as a powerful tool to help the implementation of ecosystem-based approaches to fisheries management, the new paradigm for fisheries science. Holistic approaches, including parasites as biological tags for stock delineation will render valuable information to help insure fisheries and marine ecosystems against further depletion and collapse.

scholarly journals Ontogeny of Adenohypophyseal Cells, Pituitary Gland Development and Structure in Adults of Astyanax Lacustris (Teleostei, Characidae): an Emerging Neotropical Fish Species

2021 ◽  
Author(s):  
Giovana Souza Branco ◽  
Lázaro Wender O. De Jesus ◽  
Monica Cassel ◽  
Chayrra Chehade ◽  
Marília de Paiva Camargo ◽  
...  
Keyword(s):  
Pituitary Gland ◽  
Early Development ◽  
Fish Species ◽  
Cell Types ◽  
South American ◽  
Neotropical Fish ◽  
Future Studies ◽  
Commercial Importance ◽  
Gland Morphogenesis ◽  
Gland Development

Abstract Pituitary gland morphogenesis of the adenohypophyseal (AH) cells of Astyanax lacustris are presented herein. This Characiformes species show great ecological and commercial importance, and it has been increasingly used as a biological model. The first AH cells of A. lacustris were detected at 1 dah by the immunostaining of PRL producing cells. The morphology of the gland presented changes in shape throughout the development, starting elongated but more oval at the end. The neurohypophysis was differentiated at 3 dah, along with the identification of ACTH, MSH, TSH, and FSH producing cells. Identification of the immunoreactive cells to anti-LH, anti-SL, and anti-GH antibodies occurred at 5 dah. At 20 dah, an increase in pituitary size and the presence of the pituitary stalk were observed. At 60 dah, the pituitary already had the same shape seen in adults. The ontogeny of adenohypophyseal cells in A. lacustris corroborates the heterogeneity in the appearance of these cell types in teleosts and suggests that these hormones actively participate during the early development of this species. Our results collaborate with the understanding of the morphogenesis of the hypothalamic-pituitary-gonadal axis in South American teleosts, showing essential data for the development of future studies related to pituitary morphophysiology.

Bluetongue virus in South America: current status based on phylogenetic analysis

2021 ◽  
Author(s):  
Danilo Legisa ◽  
Maria José Dus Santos
Keyword(s):  
Phylogenetic Analysis ◽  
Maximum Likelihood ◽  
South America ◽  
Bluetongue Virus ◽  
Phylogenetic Analyses ◽  
Current Status ◽  
Accurate Information ◽  
South American ◽  
American Continent ◽  
Genetic Continuity

Bluetongue (BT) is an insect-borne disease affecting domestic and wild ruminants. Bluetongue virus (BTV) is the causative agent of the BT disease. BT outbreaks have been widely recorded worldwide. However, in the South American subcontinent, accurate information about the disease and molecular epidemiology is still lacking because little effort has been made to cover the region. This study comprises an exhaustive phylogenetic analysis including all BTV sequences available in databases and reports new Argentinean sequences for Seg 8 and Seg 9. Maximum-likelihood phylogenetic analyses were conducted for Seg 2, Seg 3, Seg 6, Seg 7, Seg 8, Seg 9 and Seg 10. Throughout the study, wide circulation and genetic continuity along the American continent were detected. Also, reassortment events are reported, and the historical virus introduction path into and through South America is suggested.

Cryopreserved Semen Motility of South American Neotropical Fish: A Meta-Analysis

2021 ◽  
pp. 1-27
Author(s):  
Paula Graziela Lassen ◽  
Maria Eugênia Andrighetto Canozzi ◽  
Bruna Bitencourt da Costa ◽  
Júlio Otávio Jardim Barcellos ◽  
Danilo Pedro Streit
Keyword(s):  
Meta Analysis ◽  
South American ◽  
Neotropical Fish

Morphological abnormalities in cryopreserved semen from South American neotropical fish: A meta‐analysis

2021 ◽  
Author(s):  
Paula Graziela Lassen ◽  
Maria Eugênia Andrighetto Canozzi ◽  
Bruna Bitencourt Costa ◽  
Júlio Otávio Jardim Barcellos ◽  
Danilo Pedro Streit
Keyword(s):  
Meta Analysis ◽  
South American ◽  
Neotropical Fish ◽  
Morphological Abnormalities

scholarly journals Geothermal Energy in Colombia as of 2018

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
David Alejandro Moreno-Rendón ◽  
Jacqueline López-Sánchez ◽  
Daniela Blessent
Keyword(s):  
Geothermal Energy ◽  
Current Status ◽  
South American ◽  
Geothermal Area ◽  
Research Papers ◽  
Geothermal Resources ◽  
Volcanic System ◽  
Tectonic Plates ◽  
Cerro Negro ◽  
Favorable Conditions

Colombia is a country with great potential for the exploitation of geothermal energy due to its high volcanic activity caused by the subduction between the Nazca and South American tectonic plates. However, this energy is yet to be exploited. This article seeks to describe, by means of a literature review and information processing, the current status of geothermal energy in Colombia, including the current regulations, the limitations, the recommendations to develop the geothermal energy, and some of the most important projects, studies, and research papers that have been emerged on the discovery, exploration, and exploitation of geothermal energy within the country, emphasizing the areas where exploration projects have been initiated, such as the Nevado del Ruiz volcano, the Tufiño–Chiles–Cerro Negro volcanic system, the Azufral volcano geothermal area, and the Paipa geothermal area. Over the years, energy vulnerability in Colombia and a government policy of fostering sustainable development in different territories have generated favorable conditions for the exploitation of geothermal resources. Nevertheless, there are several technical, infrastructural, legal, and institutional barriers that slow the proper development of these projects.

scholarly journals The current status of knowledge on Lycidae Laporte, 1836 from Brazil (Insecta: Coleoptera) [with erratum]

Check List ◽  
2013 ◽  
Vol 9 (2) ◽  
pp. 323 ◽  
Author(s):  
Elynton Alves do Nascimento
Keyword(s):  
Complete List ◽  
Current Status ◽  
South American ◽  
The South ◽  
Tropical Regions ◽  
Occurrence Data

Lycids are often very aposematic toxic beetles, and are considered models in mimicry systems. They are cosmopolitan, with the highest diversity around tropical regions, however the knowledge of the South American lycids is yet relatively poor. Here I present an overview of the Brazilian lycids including a complete list of species and updated occurrence data.

Helminth parasites of South American fishes: current status and characterization as a model for studies of biodiversity

2016 ◽  
Vol 91 (2) ◽  
pp. 150-164 ◽  
Author(s):  
J.L. Luque ◽  
F.B. Pereira ◽  
P.V. Alves ◽  
M.E. Oliva ◽  
J.T. Timi
Keyword(s):  
South America ◽  
Life Cycles ◽  
Fish Parasites ◽  
Current Status ◽  
South American ◽  
Helminth Parasites ◽  
Research Groups ◽  
Ecological Data ◽  
Host Parasite ◽  
Diverse Groups

AbstractThe South American subcontinent supports one of the world's most diverse and commercially very important ichthyofauna. In this context, the study of South American fish parasites is of increased relevance in understanding their key roles in ecosystems, regulating the abundance or density of host populations, stabilizing food webs and structuring host communities. It is hard to estimate the number of fish parasites in South America. The number of fish species studied for parasites is still low (less than 10%), although the total number of host–parasite associations (HPAs) found in the present study was 3971. Monogeneans, with 835 species (1123 HPAs, 28.5%), and trematodes, with 662 species (1127 HPAs, 30.9%), are the more diverse groups. Data gathered from the literature are useful to roughly estimate species richness of helminths from South American fish, even though there are some associated problems: the reliability of information depends on accurate species identification; the lack of knowledge about life cycles; the increasing number of discoveries of cryptic species and the geographically biased number of studies. Therefore, the closest true estimations of species diversity and distribution will rely on further studies combining both molecular and morphological approaches with ecological data such as host specificity, geographical distribution and life-cycle data. Research on biodiversity of fish parasites in South America is influenced by problems such as funding, taxonomic impediments and dispersion of research groups. Increasing collaboration, interchange and research networks in the context of globalization will enable a promising future for fish parasitology in South America.

scholarly journals Global Disappearance of Tropical Mountain Glaciers: Observations, Causes, and Challenges

Geosciences ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 196 ◽  
Author(s):  
Veettil ◽  
Kamp
Keyword(s):  
Animal Health ◽  
Ice Age ◽  
Current Status ◽  
South American ◽  
Mountain Glaciers ◽  
Tropical Glaciers ◽  
Tropical Mountain ◽  
Ecological Implications ◽  
The Tropics ◽  
Regional Climates

This article reviews the current status of tropical glaciers in the South American Andes, East Africa, and Australasia by shedding light on past, present, and future glacier coverage in the tropics, the influence of global and regional climates on the tropical glaciers, the regional importance of these glaciers, and challenges of ongoing glacier recessions. While tropical glaciers have predominantly receded since the Little Ice Age, the rate of shrinkage has accelerated since the late 1970s as a result of climate changes. As a result, socio-ecological implications occur around ecosystem health, natural hazards, freshwater resources, agriculture, hydropower, mining, human and animal health, traditions and spirituality, and peace.

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