Consulta: subjectFacets:"Aquatic ecosystem"
Registros recuperados: 6
Data/hora: 29/05/2024 01:07:00

Seasonal variation in fish trophic networks in two clear-water streams in the Central Llanos region, Venezuela
Provedor de dados: Neotropical Ichthyology
Autores: Peterson,Christopher C.; Keppeler,Friedrich W.; Saenz,David E.; Bower,Luke M.; Winemiller,Kirk O.
ABSTRACT Food webs are not static entities; consumer resource interactions vary in both time and space, which complicates depiction and comparisons of food web structures. We estimated fish assemblage structure and diets in two clear-water streams in the Venezuelan Llanos region (Charcote and Charcotico) and constructed trophic networks (sub-webs defined by fishes as the principal consumers) during four periods of the annual flood pulse. As stream conditions changed from high-water to low-water, we hypothesized that: 1) the piscivore-non-piscivore ratio would increase; 2) dietary diversity would decrease; 3) interspecific dietary overlap would decline; 4) fewer allochthonous food items would be consumed; and 5) food-web connectance would increase. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic ecosystem; Flood pulse; Predation; Predator-prey interactions; Trophic niche.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200215

ALLELOPATHIC INFLUENCE OF AQUATIC WEEDS ON AGRO-ECOSYSTEMS: A REVIEW
Provedor de dados: Planta Daninha
Autores: ABBAS,T.; NADEEM,M.A.; TANVEER,A.; SYED,S.; ZOHAIB,A.; FAROOQ,N.; SHEHZAD,M.A.
ABSTRACT Aquatic weeds are higher plants found in the aquatic ecosystem and in anaerobic rice fields, where they have no economic benefits. The continuance of aquatic weeds is more widespread than terrestrial weeds because in aquatic ecosystems there is very little fluctuation in the environmental conditions compared with terrestrial ecosystems. Scientists have been working to address the harmful allelopathic effects of aquatic weeds on the aquatic ecosystem, but limited information is available on the allelopathic influence of aquatic weeds on agro-ecosystems through the release of phytotoxic compounds. Phytotoxic chemicals released by different aquatic weeds into irrigation water and/or directly into rice ecosystems might have a significant inhibitory...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathy; Aquatic ecosystem; Ecosystem interactions; Herbicides resistance management; Organic weed control; Phenolics; Weed invasion.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100301

ความหลากหลายของแมลงน้ำในแม่น้ำอิง
Provedor de dados: Thai Agricultural Research Repository
Autores: Kanyanat Soontornprasit; Siriluck Valunpion; Santiwat Pithakpol.
This study measured the aquatic insect diversity and its application as a bioindicator to monitor water quality in Ing River. Ten sampling sites throughout the river were studied from April to December 2012. Shannon-Wiener index were used to assess water quality. Physical, chemical and biological parameters of the water were also measured to compare with the surface water quality standard of Thailand. Correlations of diversity index and physical and chemical parameters of the water were investigated. The results showed that 1,880 aquatic insect from 22 families in 7 orders were identified. The most abundant family found during the experimental period of 8 months was Corixidae in the Hemiptera order. Water from all sampling sites passed CLASS 2 surface...
Tipo: PhysicalObject
Palavras-chave: Aquatic insect; Shannon-Wiener index; Bioindicator; Biodiversity; Aquatic ecosystem; Water quality; Water resource conservation; Ing river; แมลงน้ำ; ความหลากหลายทางชีวภาพ; ระบบนิเวศทางน้ำ; คุณภาพน้ำ; ดัชนีแชนนอนวีเนอร์; ดัชนีชีวภาพ; อุณหภูมิน้ำ; ความเป็นด่าง; ปริมาณออร์โธฟอสเฟต; การอนุรักษ์แหล่งน้ำ; แม่น้ำอิง.
Ano: 2013
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5777

ความหลากหลายของชนิดปลาในแม่น้ำอิง
Provedor de dados: Thai Agricultural Research Repository
Autores: Siriluck Valunpion; Apinun Suvarnaraksha.
The study examined fish species diversity in the Ing River was a part of the study on biodiversity of aquatic ecosystem in the Ing River. This study was performed from March to October of 2012. Eighty two fish species belonging to 57 genera and 22 families were identified. Cyprinidae was the most abundant species (41 species). Fish species in the Ing River composed of Carp (42.5%), Catfish (18.8%), Murrel (8.0 %) and Miscellaneous (30.7%)
Tipo: PhysicalObject
Palavras-chave: Fish species; Biodiversity; Aquatic ecosystem; Resources conservation; Ing river; ปลา; ความหลากหลายทางชีวภาพ; ระบบนิเวศทางน้ำ; ชนิดพันธุ์; การสำรวจพันธุ์ปลา; การอนุรักษ์ทรัพยากรสัตว์น้ำ; การส่งเสริมเพาะเลี้ยง; แหล่งน้ำธรรมชาติ; แม่น้ำอิง.
Ano: 2013
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5774

A predictive multimetric index based on macroinvetebrates for Atlantic Forest wadeable streams assessment
Provedor de dados: Biota Neotropica
Autores: Oliveira,Renata Bley da Silveira de; Mugnai,Riccardo; Pereira,Priscilla da Silva; Souza,Natália Freitas de; Baptista,Darcílio Fernandes.
Abstract: Multimetric Indices (MMIs) have been widely applied for ecological assessment in freshwater ecosystems. Most MMIs face difficulties when scaling up from small spatial scales because larger scales usually encompass great environmental variability. Covariance of anthropogenic pressures with natural environmental gradients can be a confounding factor in assessing biologic responses to anthropogenic pressures. This study presents the development and validation of a predictive multimetric index to assess the ecological condition of Atlantic Forest wadeable streams using benthic macroinvertebrates. To do so, we sampled 158 sites for the index development. We adjusted each biological metric to natural variation through multiple regression analyses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomonitoring; Bioassessment protocol; Aquatic ecosystem; Multimetric index; Macroinvertebrate.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000200215

Plesiomonasshigelloides and Aeromonadaceae family pathogens isolated from marine mammals of Southern and Southeastern Brazilian coast
Provedor de dados: Brazilian Journal of Microbiology
Autores: Pereira,Christiane S.; Amorim,Simone D.; Santos,André Felipe das M.; Siciliano,Salvatore; Moreno,Ignacio B.; Ott,Paulo Henrique; Rodrigues,Dalia dos Prazeres.
The aquatic environment is the habitat of many microorganisms, including Plesiomonasshigelloides and Aeromonas species which are pathogenic to human and animals. In the present investigation, we evaluated the occurrence of these pathogens from marine mammals beached or accidentally captured by fishing net in southeastern (RJ) and southern (RS) coastal Brazilian regions. A total of 198 swabs from 27 specimens of marine mammals, including 11 different species, were collected by DEENSP and GEMARS-CECLIMAR/UFRGS Institutes and sent to LRNCEB/IOC/FIOCRUZ. The samples were enriched in Alkaline Peptone Water (APW) added with 1% of sodium chloride (NaCl), APW plus 3% NaCl and incubated at 37ºC for 18-24 hours. Following, samples were streaked onto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marine mammals; Aquatic ecosystem.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000400029