Life cycle of Rhyacophila fasciata Hagen, 1859 and Hydropsyche saxonica McLachlan, 1884 in a Dinaric karst river system

Abstract To our knowledge, this was the first study to investigate the occurrence and distribution of antibiotics in the Karst river system in Kaiyang, Southwest China. Ten water samples were collected from the Karst river in Kaiyang, Southwest China. Thirty-five antibiotics, including nine sulfonamides, four tetracyclines, five macrolides, sixteen quinolones and chloramphenicol, were analyzed. The results suggest that antibiotics are widely prevalent in the Karst river, with macrolides and quinolones being the most dominant and occupying 47% and 43% of total antibiotic concentration, respectively. The maximum total concentrations of sulfonamides, tetracyclines, macrolides, and quinolones were 30.4, 421, 884, and 1,807 ng/L, respectively. Lincomycin, roxithromycin, nalidixic acid, ofloxacin, and norfloxacin were detected in all samples with a detection frequency of 100%. The main sources of antibiotics were wastewater treatment plants (WWTPs) and rural dumps that did not contain sanitary treatment, which accounted for 33% and 40% of the total antibiotics present in the Karst river. Due to an increase in river flow quantity, the presence of WWTPs and rural dumps did not affect the concentration and distribution of antibiotics in the Karst river; however, the mass flux of antibiotics were significantly affected by the contamination source and the poor natural attenuation.

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Effects of hydrogeochemical conditions on the distribution of pesticides in the karst river system

Environmental Science and Pollution Research ◽

10.1007/s11356-020-09262-6 ◽

2020 ◽

Vol 27 (24) ◽

pp. 30468-30478

Author(s):

Tian Zhou ◽

Fuyang Huang ◽

Chong Zhang ◽

Zeyan Li ◽

Fei Liu

Keyword(s):

River System ◽

Karst River

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Life cycle of an endangered riffle beetle, Leptelmis gracilis Sharp (Coleoptera: Elmidae), in the Hiikawa River system, Shimane prefecture, Japan

Entomological Science ◽

10.1111/ens.12442 ◽

2020 ◽

Vol 23 (4) ◽

pp. 445-452

Author(s):

Ryosuke Morimoto ◽

Masakazu Hayashi

Keyword(s):

Life Cycle ◽

River System

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Assessing the effects of oxidation of pyrite and reducing nitrogen fertilizer on chemical weathering and the carbon cycles in a karst river system by using multiple isotopes

10.5194/egusphere-egu21-3682 ◽

2021 ◽

Author(s):

Sen Xu ◽

Si-Liang Li ◽

Jing Su ◽

Fu-Jun Yue ◽

Jun Zhong ◽

...

Keyword(s):

Water Chemistry ◽

Nitrogen Fertilizer ◽

Chemical Weathering ◽

River System ◽

Strong Acid ◽

Mixing Models ◽

Karst River ◽

Strong Acids ◽

Acid Weathering ◽

Multiple Isotopes

Pyrite is the most common sulfide mineral occurring in sedimentary and igneous rocks and globally contributes a greater flux of sulfate. Large quantity of reactive nitrogen as fertilizers for agricultural production has been released into the environment in China over recent decades. Sulfuric acid formed by oxidative weathering of pyrite (OWP) and nitric acid formed by oxidation of reducing nitrogen fertilizer (ONF) through neutralization with carbonate minerals can counteract CO2 drawdown from chemical weathering. Here, we use the multiple isotopes (13C-DIC, 34S and 18O-SO42&#8211;, 15N and 18O-NO3&#8211;, and 18O and D-H2O) and water chemistry, as well as historical hydrochemical data to assess the roles of strong acids in chemical weathering and the carbon cycle in a karst river system (Chishui River, southwestern China). The variations in alkalinity and the &#948;13C-DIC along with theoretical mixing models demonstrate the involvement of strong acids in carbonate weathering. However, the strong acid weathering flux determined by &#948;13C-DIC and mixing models is considered to be overestimated due to the effects of photosynthesis and degassing of CO2 on &#948;13C-DIC signal. The protons liberated from OWP and ONF can be constrained by water chemistry and isotope techniques with the use of a Bayesian isotope mixing model. The strong acid weathering flux determined using proton information is higher that determined by &#948;13C-DIC and mixing models. This suggests that the additional protons derived from OWP and ONF might be consumed in other ways without affecting the &#948;13C-DIC signals, such as the neutralization of acidic waters. These results indicate that OWP and ONF coupled with carbonate dissolution significantly enhanced the coupling cycles of carbon, nitrogen and sulfur in this river system.

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Invasion of the zebra mussel (Dreissena polymorpha) in a Dinaric karst river after formation of a new reservoir

BioInvasions Records ◽

10.3391/bir.2020.9.3.08 ◽

2020 ◽

Vol 9 (3) ◽

pp. 519-537

Author(s):

Krešimir Žganec ◽

Jasna Lajtner ◽

Stewart Schultz ◽

Damir Valić

Keyword(s):

Zebra Mussel ◽

Dreissena Polymorpha ◽

Dinaric Karst ◽

Karst River ◽

New Reservoir

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The life history of Cyclops scutifer Sars (Copepoda: Cyclopoida) in a small lake of the Matamek River System, Quebec

Canadian Journal of Zoology ◽

10.1139/z78-349 ◽

1978 ◽

Vol 56 (12) ◽

pp. 2603-2607 ◽

Cited By ~ 4

Author(s):

J. J. Boers ◽

J. C. H. Carter

Keyword(s):

Life History ◽

Life Cycle ◽

Calanoid Copepod ◽

River System ◽

The Other ◽

Cyclopoid Copepod ◽

Small Lake ◽

History Of ◽

Cyclops Scutifer ◽

Copepoda Cyclopoida

A study of the life history of the cyclopoid copepod Cyclops scutifer Sars in a small lake of the Matamek River System, Quebec, indicates a 1-year life cycle with four cohorts produced annually. The primary cohort overwinters as early nauplii and reaches maturity during midsummer when it spawns the primary cohort of the succeeding year. The other cohorts may merge with either each other or the primary cohort and contribute somewhat less to the overall cycle. Slower development of copepodites of the second cohort in 1976 may have been the result of an inadequate number of naupliar prey from the calanoid copepod Diaptomus minutus.

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Coupled controls of climate, lithology and land use on dissolved trace elements in a karst river system

Journal of Hydrology ◽

10.1016/j.jhydrol.2020.125328 ◽

2020 ◽

Vol 591 ◽

pp. 125328 ◽

Cited By ~ 1

Author(s):

Sen Xu ◽

Yunchao Lang ◽

Jun Zhong ◽

Min Xiao ◽

Hu Ding

Keyword(s):

Land Use ◽

Trace Elements ◽

River System ◽

Karst River ◽

Dissolved Trace Elements

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Aquatic insects along environmental gradients in a karst river system: A comparative analysis of EPT larvae assemblage components

International Review of Hydrobiology ◽

10.1002/iroh.201301641 ◽

2014 ◽

Vol 99 (3) ◽

pp. 222-235 ◽

Cited By ~ 3

Author(s):

Mojca Hrovat ◽

Gorazd Urbanič ◽

Ignac Sivec

Keyword(s):

Comparative Analysis ◽

Aquatic Insects ◽

Environmental Gradients ◽

River System ◽

System A ◽

Karst River

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The biology of a landlocked form of the normally catadromous salmoniform fish Galaxias maculatus (Jenyns). I. Life cycle and origin

Marine and Freshwater Research ◽

10.1071/mf9710091 ◽

1971 ◽

Vol 22 (2) ◽

pp. 91 ◽

Cited By ~ 52

Author(s):

DA Pollard

Keyword(s):

Life Cycle ◽

New Zealand ◽

River System ◽

Heavy Rain ◽

Early Spring ◽

Ancestral Population ◽

Late Winter ◽

Eastern Australia ◽

Galaxias Maculatus ◽

Western Victoria

In contrast to most other members of the family Galaxiidae which live and reproduce in fresh water, Galaxias maculatus, the common jollytail of Australia and "whitebait" of New Zealand, is normaIly catadromous throughout its range (south-eastern Australia, New Zealand, and southern South America). In some athalassic inland lakes on the volcanic plains of south-western Victoria, however, a number of populations apparently descended from this species have becomelandlocked. The life cycle of the forminhabiting one of these lakes (the "landlocked jollytail" of Lake Modewarre) may be briefly summarized as follows: Gonadal maturation in the adult fish, which live in the slightly saline landlocked lake, begins around March and is almost completed by about June. The final stage of maturation is not reached, however, until these fish migrate short distances up intermittent inflowing creeks when the latter begin to flow in late winter and spring (July-October). Spawning takes place when the creeks are swollen after heavy rain, the eggs being deposited amongst flooded vegetation in shallow areas of slow-flowing water along the creek banks. Many of the spent fish die after spawning. The eggs, which are stranded when the flood-waters subside, develop amongst the vegetation on the banks above the normal water level. After development is complete reimmersion by the first flood to cover them stimulates hatching. The normal developmental period is probably about 2 weeks, but in the absence of flooding hatching can be delayed up to at least a month after fertilization. The newly hatched larvae are washed downstream into the lake where they feed and grow to maturity. They migrate upstream to spawn in the following late winter-early spring season at an age of approximately 1 year. The fish grow to about 9 cm in their first year, 14 cm in their second, and 17 cm in their third year. The average size of the females is greater than that of the males. The general features of the life history of this landlocked form are compared and contrasted with those of the stream-dwelling species G. maculatus and a number of other salmoniform fishes. The geological origin of the complex of lakes in south-western Victoria inhabited by landlocked galaxiid populations is discussed, and an hypothesis concerning the origin of the Lake Modewarre form from an ancestral population of G. maculatus in the Barwon-Leigh River system is advanced.

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