Unravelling the taxonomy and identification of a problematic group of benthic fishes from tropical rivers (Gobiidae: Glossogobius )

2021 ◽  
Author(s):  
M. P. Hammer ◽  
L. Taillebois ◽  
A. J. King ◽  
D. A. Crook ◽  
D. Wedd ◽  
...  
Keyword(s):  
Tropical Rivers ◽  
Benthic Fishes

scholarly journals Sources of dissolved organic carbon in small volcanic mountainous tropical rivers, examples from Guadeloupe (French West Indies)

Geoderma ◽  
2016 ◽  
Vol 282 ◽  
pp. 129-138 ◽  
Author(s):  
Emily Lloret ◽  
Céline Dessert ◽  
Heather L. Buss ◽  
Carine Chaduteau ◽  
Sylvain Huon ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
West Indies ◽  
Tropical Rivers ◽  
French West Indies

A comparison of the suspended and dissolved matter dynamics of two large inter-tropical rivers draining into the Atlantic Ocean: the Congo and the Orinoco

2013 ◽  
Vol 27 (15) ◽  
pp. 2153-2170 ◽  
Author(s):  
Alain Laraque ◽  
Bartolo Castellanos ◽  
Johannes Steiger ◽  
José Luis Lòpez ◽  
Albert Pandi ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Tropical Rivers ◽  
Dissolved Matter

scholarly journals Prediction of Stream Flow in Humid Tropical Rivers by Support Vector Machines

2017 ◽  
Vol 111 ◽  
pp. 01007 ◽  
Author(s):  
Mohammed Seyam ◽  
Faridah Othman ◽  
Ahmed El-Shafie
Keyword(s):  
Support Vector Machines ◽  
Stream Flow ◽  
Support Vector ◽  
Tropical Rivers ◽  
Vector Machines

scholarly journals Seasonal flooding, instream habitat structure and fish assemblages in the Mulgrave River, north-east Queensland: towards a new conceptual framework for understanding fish-habitat dynamics in small tropical rivers

2008 ◽  
Vol 59 (2) ◽  
pp. 97 ◽  
Author(s):  
Thomas S. Rayner ◽  
Bradley J. Pusey ◽  
Richard G. Pearson
Keyword(s):  
Habitat Structure ◽  
Fish Assemblages ◽  
Fish Habitat ◽  
Dry Season ◽  
Assemblage Structure ◽  
Tropical Rivers ◽  
Wet Season ◽  
Seasonal Flooding ◽  
North East ◽  
Habitat Dynamics

Strong relationships between seasonal flooding, instream habitat structure and fish assemblages have been well documented in large tropical rivers (e.g. the flood pulse concept). However, the mechanics of these relationships are likely to differ substantially in smaller coastal rivers, such as those in Costa Rica, south-east Brazil and Australia’s Wet Tropics. These systems typically feature steep upland streams with short, deeply incised lowland channels and poorly connected floodplains. This hypothesis was investigated by documenting spatial and temporal variation in fish-habitat relationships in the Mulgrave River, north-east Queensland. Sampling was conducted at four lowland sites under a range of flow conditions, from dry-season baseflows to a one-in-ten-year flood. Longitudinal environmental gradients and fine-scale habitat patches were important in regulating fish assemblage structure during the dry season. However, high wet-season flows, constrained by the deep channel, acted as disturbances rather than gentle flood-pulses. In particular, the mobilisation of bed sediments led to scouring of aquatic vegetation and a dramatic reduction in habitat heterogeneity. Seasonal movements of fish led to significant changes in assemblage structure – from a community dominated by Neosilurus ater, Hypseleotris compressa, Awaous acritosus and Redigobius bikolanus during the dry season, to one dominated by Nematalosa erebi, Ambassis agrammus and Glossamia aprion during the wet season. Based on these observations, together with information from the literature, a conceptual model of fish-habitat dynamics is presented that is better suited to small tropical rivers than those developed in larger systems with expansive floodplains.

Diel vertical migration of adult burbot: a dynamic trade-off among feeding opportunity, predation avoidance, and bioenergetic gain

2013 ◽  
Vol 70 (12) ◽  
pp. 1765-1774 ◽  
Author(s):  
P.M. Harrison ◽  
L.F.G. Gutowsky ◽  
E.G. Martins ◽  
D.A. Patterson ◽  
A. Leake ◽  
...  
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Depth Distribution ◽  
Benthic Species ◽  
Migration Strategy ◽  
Trade Off ◽  
Vertical Activity ◽  
Benthic Fishes ◽  
Diel Period ◽  
Migration Probability

Diel vertical migration (DVM) of pelagic organisms is typically attributed to bioenergetic gain, foraging opportunity, predator avoidance, and multifactor hypotheses. While a number of benthic species perform nightly migrations into shallower waters, the function of these DVMs has largely been ignored in benthic fishes. We used depth and temperature sensing telemetry to investigate DVM function in burbot (Lota lota), a freshwater benthic piscivore. We modeled the influence of season, diel period, and body size on the depth, vertical activity, migration probability, and thermal experience of 47 adult burbot over 2 years in a reservoir in British Columbia, Canada. Burbot were found to occupy significantly shallower water at night than during the day. Our results, which showed elevated nightly activity and a seasonal size-structured depth distribution during DVMs, suggest these migrations likely provide a feeding opportunity “window” for this nocturnal predator, constrained by predation or cannibalism threats to smaller individuals. The observed thermal experience patterns suggest DVM may also provide a seasonal bioenergetic advantage. Our detection of within-individual plasticity in migration strategy is indicative of a partial migration. Taken together, our results suggest a multifactor DVM hypothesis: a dynamic trade-off among bioenergetic advantage, foraging opportunity, and predation threat.

Rarely Seen Fishes Captured in Hudson Submarine Canyon

1974 ◽  
Vol 31 (2) ◽  
pp. 231-234
Author(s):  
R. L. Haedrich ◽  
P. T. Polloni
Keyword(s):  
Species Composition ◽  
Submarine Canyon ◽  
Abundant Species ◽  
Antimora Rostrata ◽  
Benthic Fishes ◽  
Made In

The alepocephalid Rouleina mollis (Koehler 1896), the ophidiid Xyelacyba myersi Cohen 1961, and the two macrourids Nezumia longebarbatus (Roule and Angel 1933) and Sphagemacrurus grenadae (Parr 1946) were trawled in Hudson Submarine Canyon (ca. 39°18′N 72°00′W) between 1500 and 1960 m on the bottom. These records constitute considerable extensions of the known ranges. The eretmophorid Halargyreus johnsoni Günther 1862, previously recorded from Hudson Canyon but unknown elsewhere in the area, was also taken. The trawl haul which captured these noteworthy species took, in addition, 290 specimens in 18 species of deep benthic fishes. Abundant species included Antimora rostrata, Synaphobranchus kaupi, Alepocephalus agassizi, Nezumia bairdii, Dicrolene intronigra, and Aldrovandia phalacra. These species also predominated in a catch made in a similar haul at the same place 4 yr previously, suggesting that the species composition of such deep-living canyon assemblages is quite stable.

Assessment of the dissolved inorganic and organic carbon flux in Cauvery, a tropical river of Southern India.

2021 ◽  
Author(s):  
RamyaPriya Ramesh ◽  
Elango Lakshmanan
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Flow Direction ◽  
Carbon Fluxes ◽  
Southern India ◽  
Tropical Rivers ◽  
Tropical River ◽  
Dissolved Carbon ◽  
Doc Concentration ◽  
Inorganic And Organic

<p>The carbon fluxes in rivers plays a critical role in the global carbon cycle but its role is always understated. The tropical rivers alone accounts for about 70% of global riverine carbon fluxes due to their large areal extent, varying climatic conditions and land use. Studies on the dissolved carbon fluxes in non-perennial tropical rivers are limited, but it holds much importance as that of perennial rivers. Hence, the present study was carried out with an objective to understand about the inorganic and organic carbon fluxes in a large non-perennial tropical river of Southern India. The samples were collected from 28 locations along the river thrice in a year from 2013-2020 and were analysed for major ions, DIC and DOC. The concentration of DIC in the river water in most of the locations is greater than that of DOC. The DOC concentration is greater at pristine locations thereby decreasing along the flow direction of the river, whereas the DIC concentration increases along the flow direction. The spatial and temporal variability in DOC and DIC concentrations is attributed due to the changes in the rainfall, river flow, climate, lithology, land use patterns, in the catchment. The DIC concentration was found to be majorly governed by silicate and carbonate weathering along with biogenic process, mineralisation and other river process, whereas the primary production, microbial process along with soil organic carbon influences the DOC concentration in the rivers. Thus, this study identifies the sources of DIC and DOC in rivers and the processes which influences the carbon export to the sea.</p>

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