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Iguanodectes Rachovii
''Iguanodectes rachovii'' is a species of freshwater fish that inhabits the rivers of the Amazon basin. It largely consumes insects, though it will eat plants if given the opportunity, and has a peaceful disposition, able to live alongside various other species. It is often found in groups of 3 to 30 specimens, lingering at the edges of streams near the surface of the water. Given its appealing coloration, ''I. rachovii'' has a minor presence in aquarium settings, but is not often taken from the wild for export. Arthur Rachow, an aquarist from Germany, brought specimens of ''I. rachovii'' to the attention of British ichthyologist Charles Tate Regan, thereby assisting in the discovery and description of a new species. Subsequently, the fish was named in his honor. Description ''Iguanodectes rachovii'' is a small fish, reaching a maximum of 6.2 cm (2.4 in) standard length (SL). It has an elongate body shape, and is generally quite slender, as is the case in all ''Iguanodectes''; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animalia
Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes, containing animals such as nematodes, arthropods, flatworms, annelids and molluscs, and the deuterostomes, containing the echinode ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guamá River
The Guamá River is located in northeast Pará state in north-central Brazil. Its mouth forms the southern border of the state capital, Belém. Its watershed drains an area of . The navigability is feasible in the last of the river, from the municipality of São Miguel do Guamá to Guajará Bay. Among its tributaries, the Acará, Capim and Moju rivers stand out. In the Guamá River, the pororoca phenomenon usually occurs. The main campus of the Federal University of Pará, near Belém, is located on its right bank. About 75% of the water consumed in Belém comes from this river, which receives 11 streams contaminated by the irregular disposal of urban waste, since only 4, 5% of the home network of the Pará capital is connected to the collecting network. The Gurupí, Capim and Guamá rivers flow into the mouth of the Amazon and are affected by the daily tides, which force water from the Amazon upstream. They are in the Tocantins–Araguaia–Maranhão moist forests ecoregion. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Described In 1912
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods. Most fis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IUCN Red List
The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biological species. It uses a set of precise criteria to evaluate the extinction risk of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world. With its strong scientific base, the IUCN Red List is recognized as the most authoritative guide to the status of biological diversity. A series of Regional Red Lists are produced by countries or organizations, which assess the risk of extinction to species within a political management unit. The aim of the IUCN Red List is to convey the urgency of conservation issues to the public and policy makers, as well as help the international community to reduce species extinction. According to IUCN the formally stated goals of the Red List are to provi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cabomba
''Cabomba'' is an aquatic plant genus, one of two belonging to the family Cabombaceae. It has divided submerged leaves in the shape of a fan (hence the vernacular name fanwort) and is much favoured by aquarists as an ornamental and oxygenating plant for fish tanks. Use in the aquarium trade has led to some species being introduced to other parts of the world, such as Australia, where they have become weeds. Species *'' Cabomba aquatica'' Aubl. (fanwort) *'' Cabomba caroliniana'' A. Gray (green cabomba) *'' Cabomba furcata'' Schult. & Schult.f. (red cabomba) *'' Cabomba haynesii'' *'' Cabomba palaeformis'' Fassett ''Cabomba'' as an aquarium plant ''Cabomba'' is frequently planted in aquaria, as an attractive-leaved water plant that is fast-growing (up to one inch per day). Green cabomba (''C. caroliniana'') is the most common, and the easiest aquarium subject. By contrast, red cabomba (''C. furcata'') is considered to be one of the hardest plants to care for in the aquari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heteranthera
''Heteranthera'' is a genus of aquatic plants in the water hyacinth family, Pontederiaceae, known generally as mud plantains. Species of this genus are native to tropical and subtropical America and Africa. They live in the water or in wet soils. They produce leaves on long petioles and some are cultivated for their attractive flowers. Leaves are of two types - linear and submerged or orbicular and floating. Some species have cleistogamic flowers. Selected species *'' Heteranthera callifolia'' (syn. ''H. callaefolia'') *''Heteranthera dubia'' ( Jacq.) MacMill. – Grassleaf mud plantain, water stargrass *'' Heteranthera limosa'' ( Sw.) Willd. Carl Ludwig Willdenow (22 August 1765 – 10 July 1812) was a German botanist, pharmacist, and plant taxonomist. He is considered one of the founders of phytogeography, the study of the geographic distribution of plants. Willdenow was al ... – Blue mud plantain, ducksalad *'' Heteranthera mexicana'' S.Watson – ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrammus Ulreyi
''Hemigrammus ulreyi'', commonly known as Ulrey's tetra, is a Paraguayan tropical aquarium fish from the family Characidae named in honor of the biologist Albert B. Ulrey. It was originally named ''Tetragonopterus ulreyi'' in 1895. In the aquarium This aquarium fish suitable for a community aquarium can reach 5 cm (2 in) in length and does well at temperatures of 21 to 29 °C (70 to 85 °F).Dr. Herbert R. Axelrod and Dr. Leonard P. Schultz, ''Handbook of Tropical Aquarium Fishes'' (Neptune City: T.F.H. Publications, Inc., 1983), 226. Breeding The breeding size is . Dr. Herbert R. Axelrod, editor of '' Tropical Fish Hobbyist Magazine'', and Dr. Leonard P. Schultz, retired curator of fishes at the Smithsonian Institution, wrote that the breeding of this species is a problem, since the species is nearly identical to ''Hyphessobrycon heterorhabdus ''Hyphessobrycon heterorhabdus'', the Belgian flag tetra or flag tetra, is a species of characid fish from Brazi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Copeina Guttata
''Copeina guttata'' is one of two fish species in the genus ''Copeina'', which is in the family ''Lebiasinidae The pencil fishes are a family (Lebiasinidae) of freshwater fishes found in Costa Rica, Panama, and South America. They are usually small and are known as ornamental fishes in aquaria, including popular fishes such as the various pencil fish a ...''. Description Max length : 7.6 cm SL male/unsexed. Distribution South America: middle Amazon River basin. References Lebiasinidae Taxa named by Franz Steindachner Fish described in 1876 {{Characiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sympatry
In biology, two related species or populations are considered sympatric when they exist in the same geographic area and thus frequently encounter one another. An initially interbreeding population that splits into two or more distinct species sharing a common range exemplifies sympatric speciation. Such speciation may be a product of reproductive isolation – which prevents hybrid offspring from being viable or able to reproduce, thereby reducing gene flow – that results in genetic divergence. Sympatric speciation may, but need not, arise through secondary contact, which refers to speciation or divergence in allopatry followed by range expansions leading to an area of sympatry. Sympatric species or taxa in secondary contact may or may not interbreed. Types of populations Four main types of population pairs exist in nature. Sympatric populations (or species) contrast with parapatric populations, which contact one another in adjacent but not shared ranges and do not ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riparian Vegetation
A riparian zone or riparian area is the interface between land and a river or stream. Riparian is also the proper nomenclature for one of the terrestrial biomes of the Earth. Plant habitats and communities along the river margins and banks are called riparian vegetation, characterized by hydrophilic plants. Riparian zones are important in ecology, environmental resource management, and civil engineering because of their role in soil conservation, their habitat biodiversity, and the influence they have on fauna and aquatic ecosystems, including grasslands, woodlands, wetlands, or even non-vegetative areas. In some regions, the terms riparian woodland, riparian forest, riparian buffer zone, riparian corridor, and riparian strip are used to characterize a riparian zone. The word ''riparian'' is derived from Latin '' ripa'', meaning " river bank". Characteristics Riparian zones may be natural or engineered for soil stabilization or restoration. These zones are important natural b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algae
Algae (; singular alga ) is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular microalgae, such as ''Chlorella,'' ''Prototheca'' and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to in length. Most are aquatic and autotrophic (they generate food internally) and lack many of the distinct cell and tissue types, such as stomata, xylem and phloem that are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the ''Charophyta'', a division of green algae which includes, for example, ''Spirogyra'' and stoneworts. No definition of algae is generally accepted. One definition is that algae "have chlorophyll ''a'' as their primary photosynthetic pigment and lack a sterile covering of cells around thei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maracanã River (Pará)
The Maracanã River ( pt, Rio Maracanã) is a river of the state of Pará, Brazil. Course The Maracanã is a meandering river with a main channel that varies in depth in its lower reaches from . It rises in the south of the municipality of Castanhal, Pará, then flows in a northeast direction to the Atlantic Ocean at Maracanã, Pará. The river is lowest between September and October and highest between February and April. Its main tributary is the Caripi River, which enters the Maracanã from the left. Santarém Novo is on the right bank of the river about from its mouth on the Atlantic. The Chocoaré - Mato Grosso Extractive Reserve protects part of the right (east) shore of the Maracanã River. The lower reaches of the Maracanã River, before it empties into the Atlantic Ocean beside Maiandeua Island, are protected by the Maracanã Marine Extractive Reserve, created in 2002. The municipality and town of Maracanã are at the mouth of the river. Environment The vegetat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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