Community structure of nekton in the upstream of Wampu Watershed, North Sumatra, Indonesia

Abstract

Desrita, Muhtadi A, Tamba IS, Ariyanti J, Sibagariang RD. 2018. Community structure of nekton in the upstream of WampuWatershed, North Sumatra, Indonesia. Biodiversitas 19: 1366-1374. River is a habitat for many aquatic organisms. Water quality is themain river characteristic that strongly influences distribution pattern, biodiversity, and abundance of aquatic organisms. Nekton isaquatic organism that swims and moves actively on their desire, for example, fish, shrimp, amphibian and also big aquatic insects. Thepurpose of this research was to know the habitat condition and biodiversity of nekton in the upstream of Wampu watershed. The habitatcondition was measured by examining the temperature, visibility, flow velocity, depth of waters, dissolved oxygen, pH, kind ofsubstrate, the width of the river, body width of river and rate of flow of the river. The type of nekton was determined by catching thenekton using a backpack of electrofishing unit with an electric flow of 12 Volt and 9 Ampere. The upstream habitat condition of Wampuwatershed was characterized by big stone, pebble, sandy type of substrate with moderate to strong current flow, and the clear aquatic.Physical and chemical parameters in upstream of Wampu watershed were still sustainable and appropriate as habitat for fish and shrimp.The result of this research showed a variety of nekton collected, comprised of 27 species of fish, five species of shrimp of inland water.Two species of fish from Tor genera, i.e., T. soro and T. tambroides were also found in this study. The highest diversity (H´) in thisresearch site was the Bahorok River (2.12), followed by Landak River (1.93) at the second, and the lowest was Berkail River with onlyabout 1.50 diversity index.

Biodiversity of nekton in Batangtoru River and its tributaries in North Sumatra, Indonesia

“…Small sampling location (not spread evenly) and one-time sampling might have caused the low diversity found in that study. As a comparison, studies in Wampu watershed by Muhtadi et al (2017) and Desrita et al (2018) found at least 26 species of fish, 3 freshwater shrimps, and 1 freshwater crab. The objective of this study was to provide basic data on diversity of aquatic organisms in North Sumatra, Indonesia.…”

“…Pranata et al (2016) found 3 orders, 7 families of 13 genera and 16 species of fish in Sangkir River, Rokan Hulu Regency, Riau Province. Muhtadi et al (2017) and Desrita et al (2018) found 12 species and 3 species of Bagridae in the upstream waters of Batangtoru watershed with a total of 37 species of nekton species.…”

“…In total, there were 19 species of Cyprinidae found in the Batangtoru River and its tributaries. Some studies found more species than in the Batangtoru River and its tributaries, such as; Muhtadi et al (2017) and Desrita et al (2018) found 50 species of nekton (42 fishes) in the Wampu watershed; Dekar et al (2018) found 44 fish species in Aceh River, and Irhami et al (2018) found 32 species in Meureubo River, West Aceh.…”

Spatial distribution management of Crustacea (Decapoda) based on conservation in tropical tidal lake

“…In the eastern part (point 4) and the river (point 11), the proportions between species are uneven, with lower species richness (4-8 species) due to lower diversity. Desrita et al (2018Desrita et al ( , 2020 stated that the diversity index is not only based on species richness but influenced by the respective proportions of species in the community. The high diversity of crustaceans at stations 6 and 8 is also accompanied by a high evenness index close to 1 and the absence of a dominant one (C value <0.25).…”

Growth pattern of yellow finned barb (Mystacoleucus marginatus, Valenciennes 1842) in the Lau Belawan River, Pancur Batu District, North Sumatera Province

“…When the water level rises, Yellow finned barb will move to lower waters to breed. Yellow finned barb fish are benthopelagic fish that live in schools in the morning [17,4,5,6]. The distribution of Yellow finned barb fish is from large rivers, then tributaries to floodplains, especially during the rainy season.…”