scholarly journals Monitoring and Quantification of Floating Biomass on Tropical Water Bodies

2015 ◽  
Author(s):  
Keyword(s):  
Water Bodies ◽  
Tropical Water

Organochlorine Pesticides (OCPs) in Sediment and Fish of Two Tropical Water Bodies Under Different Land Use

2016 ◽  
Vol 97 (1) ◽  
pp. 105-111 ◽  
Author(s):  
Demián Hinojosa-Garro ◽  
Adriana M. Burgos Chan ◽  
Jaime Rendón-von Osten
Keyword(s):  
Land Use ◽  
Organochlorine Pesticides ◽  
Water Bodies ◽  
Tropical Water

A new case of false “wide” distribution for tropical cladocerans: the genus Notoalona Rajapaksa & Fernando, 1987 (Crustacea: Cladocera) in the Old World

Zootaxa ◽  
2019 ◽  
Vol 4615 (3) ◽  
pp. 489-510
Author(s):  
ANNA N. NERETINA ◽  
ALEXEY A. KOTOV ◽  
KAY VAN DAMME
Keyword(s):  
Behavior Genetics ◽  
Distribution Patterns ◽  
Wide Distribution ◽  
Water Bodies ◽  
Tropical Asia ◽  
Tropical Water ◽  
Basal Group ◽  
African Populations ◽  
The Status ◽  
Basal Spine

Members of the genus Notoalona Rajapaksa & Fernando, 1987 (Cladocera: Chydoridae: Aloninae) are small-sized chydorids, inhabiting tropical water bodies around the World. Based on morphological features two species, N. globulosa (Daday, 1898) and N. pseudomacronyx Van Damme, Maiphae & Sa-Ardrit, 2013, were revealed in tropical Asia, but the status of African populations has remained unclear for a long time. Some authors identified African specimens as N. globulosa, others considered them as potentially new species awaiting description. Here we reexamined morphology of Notoalona populations from tropical Asia (Thailand, Laos) and Africa (Ethiopia, Kenya, Sudan and Madagascar). Although parthenogenetic females from Asia and Africa are basically similar, a single stable difference was found. In N. globulosa, the length of the basal spine and claw base are almost equal to each other, while in all investigated African specimens the basal spine is two times longer than base of postabdominal claw. This feature allows us to identify African populations as N. pseudomacronyx. Length of the setules in the basal group near the postabdominal basal spine, which was previously discussed in the literature as a specific feature for African populations, in fact, is overly variable and cannot be considered as diagnostic characteristic for the description of African populations as a separate taxon. Thus, the distribution range of N. pseudomacronyx is hereby expanded from South Africa to South East Asia, while N. globulosa s.l. occupies water bodies from tropical Asia to Australia. The same distribution patterns, when sibling species occur together in tropical Asia, have been shown for some other cladocerans as well. No doubt, the Asian tropics may be a particularly interesting area for future investigations on co-occurrence of sibling cladocerans, their ecology, behavior, genetics and potential hybridization. 

Water Hyacinth’s Effect on Greenhouse Gas Fluxes: A Field Study in a Wide Variety of Tropical Water Bodies

Ecosystems ◽  
2020 ◽  
Author(s):  
Ernandes S. Oliveira Junior ◽  
Tamara J. H. M. van Bergen ◽  
Janne Nauta ◽  
Andrea Budiša ◽  
Ralf C. H. Aben ◽  
...  
Keyword(s):  
Field Study ◽  
Greenhouse Gas ◽  
Water Bodies ◽  
Tropical Water ◽  
Gas Fluxes ◽  
Greenhouse Gas Fluxes

scholarly journals The first floristic study of freshwater dinoflagellates (Dinophyceae) in Colombia

2021 ◽  
Author(s):  
Carolina Bustamante-Gil ◽  
Eduardo Amat ◽  
Andrés Boltovskoy ◽  
John J. Ramírez-Restrepo
Keyword(s):  
Environmental Variables ◽  
Water Systems ◽  
Water Bodies ◽  
Tropical Water ◽  
Floristic Study ◽  
Ecological Aspects ◽  
Apparent Color ◽  
Physical And Chemical Variables ◽  
Physical And Chemical ◽  
Comprehensive Study

The first comprehensive study of dinoflagellate flora and their related environmental variables in reservoirs, swamps, and an insular lake of Colombia is presented. Fourteen Colombian water bodies were assessed. In each, water temperature, electric conductivity, oxygen saturation, turbidity, and apparent color were the physical and chemical variables measured. Twelve dinoflagellate taxa were recorded, indicating a considerable richness compared to similar surveys. Ensembles recovered showed a spatial structuration mediated by the type of the water bodies (reservoirs and swamps); environmental variables and species richness explained equally the differences among the water bodies. The dinoflagellate flora showed altitudinal segregation, with intermediate altitude systems displaying the highest richness values. A brief discussion about the geographical distribution of the species collected is offered. The study contributes to the knowledge of the ecological aspects of dinoflagellate flora and outlines preliminary biodiversity tendencies of ensembles in tropical water systems.

scholarly journals Ecological drivers of testate amoeba diversity in tropical water bodies of central Mexico

2018 ◽  
Author(s):  
Itzel Sigala Regalado ◽  
Socorro Lozano García ◽  
Liseth Pérez Alvarado ◽  
Margarita Caballero ◽  
Alfonso Lugo Vázquez
Keyword(s):  
Environmental Stress ◽  
Testate Amoebae ◽  
Water Bodies ◽  
Total Alkalinity ◽  
Central Mexico ◽  
Testate Amoeba ◽  
Low Oxygen ◽  
Temperature Conductivity ◽  
Tropical Water ◽  
Unicellular Organisms

Testate amoebae are unicellular organisms characterized by a shell-like test. Due to their potential use as bioindicators (and paleoindicators), these organisms have been increasingly studied in the last decade, particularly in temperate latitudes. This study’s objective was two-fold: to identify the testate amoeba communities sampled from 29 water bodies in Mexico and to determine if their presence and distribution also made them suitable bioindicators for tropical latitudes. A total of 40 taxa were recorded within 12 genera, and six significant variables—oxygen, pH, depth, temperature, conductivity, and total alkalinity—that explained testate amoeba distribution within and among the water bodies were identified through a canonical correspondence analysis. The Q-mode clusters rendered five assemblages, each named after their respective dominant species: 1) Centropyxis aculeata strain “aculeata” assemblage, 2) Difflugia oblonga strain “bryophila” assemblage, 3) Diverse assemblage, 4) Cucurbitella tricuspis assemblage, and 5) Difflugia protaeiformis strain “acuminata” assemblage. We found that Cucurbitella tricuspis and the Difflugia protaeiformis strain “acuminata” have similar ecological preferences to those reported previously for temperate lakes, with the former identified as an indicator of eutrophic environments and the latter as an indicator of low oxygen levels. On the other hand, Centropyxis aculeata strain “aculeata” and Arcella vulgaris seem to indicate adverse conditions, but the source of this environmental stress apparently differs from that reported in temperate latitudes. Although this stress source could not be identified in all cases, our study nonetheless demonstrates that testate amoebae in the water bodies of central Mexico could reveal the presence of environmental stress.

scholarly journals A First Account of Freshwater Potamolepid Sponges (Demospongiae, Spongillina, Potamolepidae) from the Middle Eocene: Biogeographic and Paleoclimatic Implications

2013 ◽  
Vol 87 (3) ◽  
pp. 373-378 ◽  
Author(s):  
Andrzej Pisera ◽  
Peter A. Siver ◽  
Alexander P. Wolfe
Keyword(s):  
New Species ◽  
Lake Sediments ◽  
High Latitude ◽  
Middle Eocene ◽  
Water Bodies ◽  
Northern Canada ◽  
Tropical Water ◽  
A New Species

We report the oldest fossil occurrence of freshwater potamolepid sponges (Demospongiae, Spongillina, Potamolepidae) to date, originating from middle Eocene lake sediments accumulated in the Giraffe kimberlite maar, northern Canada. Sponges are represented by strongyle spicules that are gemmuloscleres. These are described herein as belonging to a new species,Potamophloios canadensis. Because the most similar extant potamolepid sponges inhabit subtropical to tropical water bodies, these observations provide further evidence of biogeographic reorganizations in response to warm high-latitude Eocene paleoclimates.

scholarly journals Lightning over Three Large Tropical Lakes and the Strait of Malacca: Exploratory Analyses

2017 ◽  
Vol 145 (11) ◽  
pp. 4559-4573 ◽  
Author(s):  
Ronald L. Holle ◽  
Martin J. Murphy
Keyword(s):  
South America ◽  
Lake Victoria ◽  
Water Bodies ◽  
Tropical Lakes ◽  
Lightning Stroke ◽  
Lake Titicaca ◽  
Factors Affecting ◽  
Tropical Water ◽  
Terrain Features ◽  
Strait Of Malacca

Lightning stroke density measured by the Global Lightning Dataset (GLD360) has shown several strong maxima around the globe. Several of these extremes are located over large tropical water bodies surrounded by terrain features. Four prominent maxima are examined and compared in this study: Lake Maracaibo in South America, the Strait of Malacca in equatorial Asia, Lake Victoria in East Africa, and Lake Titicaca in South America. Specifically, the authors observe that all four water bodies exhibit sustained maxima in lightning occurrence all night, the peak lightning frequency occurs very late at night or the following morning at three of the four sites, and the nocturnal maxima are out of phase at the four locations even though the afternoon maxima over the surrounding terrain all occur between 1500 and 1700 local solar time. The meteorological factors affecting the diurnal cycle of lightning occurrence over these four water bodies, which are all adjacent to mountains, are explored in this study.

scholarly journals Heavy metal bioaccumulation in Callinectes amnicola and Farfantepenaeus notialis from three selected tropical water bodies in Lagos, Nigeria.

2017 ◽  
Vol 19 (2) ◽  
pp. 247 ◽  
Author(s):  
A. O. Lawal-Are ◽  
C. R. Mokwenye ◽  
M. F. Akinwunmi
Keyword(s):  
Heavy Metal ◽  
Water Bodies ◽  
Metal Bioaccumulation ◽  
Tropical Water ◽  
Heavy Metal Bioaccumulation
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