Expected Effects of Temperature Changes on Estuarine Fish Populations

1990 ◽  
pp. 99-103 ◽  
Author(s):  
M. J. Costa
Keyword(s):  
Fish Populations ◽  
Estuarine Fish ◽  
Temperature Changes ◽  
Effects Of Temperature

scholarly journals Preliminary assessment of surf-zone and estuarine line-fish species of the Dwesa-Cwebe Marine Protected Area, Eastern Cape, South Africa

Koedoe ◽  
2012 ◽  
Vol 54 (1) ◽  
Author(s):  
Jan A. Venter ◽  
Bruce Q. Mann
Keyword(s):  
South Africa ◽  
Law Enforcement ◽  
Fish Species ◽  
Protected Area ◽  
Surf Zone ◽  
Marine Protected Area ◽  
Fish Populations ◽  
Estuarine Fish ◽  
Catch Per Unit Effort ◽  
Preliminary Assessment

A preliminary assessment of surf-zone and estuarine line fish was carried out in the DwesaCwebe Marine Protected Area (MPA), on the Wild Coast, South Africa. The purpose was to provide baseline data on inshore line-fish stocks in the MPA. A total of 28 species was recorded, of which 53% have a conservation status reflecting some concern and 43% are endemic to southern Africa. This highlights the value of the MPA for protection of important line-fish species. Within the MPA, localised differences were detected in species diversity, size frequency and catch per unit effort between unexploited and illegally exploited areas. These differences were more prominent in slow growing, long-lived species. It thus appears that illegal exploitation is negatively affecting fish populations within the MPA, which counteract and potentially could eliminate the benefits of fish protection typically associated with no-take MPAs. These results highlight the need for improved law enforcement and better communication with neighbouring communities to increase awareness. It is further recommended that the current no-take status of the MPA should be maintained. In addition, baseline fisheries information was collected on certain fish species that could be used to inform future conservation management of the MPA.Conservation implications: The Dwesa-Cwebe Marine Protected Area is unique and important for the conservation of key surf zone and estuarine fish species. However there is a significant risk to the fish populations due to illegal exploitation. Key interventions should include enhanced law enforcement but, more important, the creation of alternative livelihoods and long term sustainable benefits to local communities.

scholarly journals Emission Characteristics of Fluorescent Labels with Respect to Temperature Changes and Subsequent Effects on DNA Microchip Studies

2005 ◽  
Vol 71 (10) ◽  
pp. 6453-6457 ◽  
Author(s):  
Wen-Tso Liu ◽  
Jer-Horng Wu ◽  
Emily Sze-Ying Li ◽  
Ezrein Shah Selamat
Keyword(s):  
Melting Curve ◽  
Melting Curve Analysis ◽  
Emission Characteristics ◽  
Fluorescent Labels ◽  
Temperature Dependent ◽  
Temperature Changes ◽  
Formamide Concentration ◽  
Effects Of Temperature ◽  
Microarray Studies ◽  
Texas Red

ABSTRACT The effects of temperature, salt concentration, and formamide concentration on the emission characteristics of commonly used fluorescent labels were evaluated on DNA microchips. The emission intensities of different fluorophores without hybridization were observed to vary, each to a different extent, to mainly temperature changes. Rhodamine red, TAMRA (tetramethylrhodamine), and dyes from the carbocyanide group exhibited the largest variations, and Texas Red and Oregon Green exhibited the smallest variations. This temperature dependency was shown to affect results obtained during melting curve analysis in DNA microarray studies. To minimize the bias associated with the temperature-dependent emission of different fluorescent labels, a normalization step was proposed.

The microeconomic effects of temperature changes

2021 ◽  
pp. 129389
Author(s):  
Wenjian He ◽  
Yu Cheng ◽  
Hongxiao Zhang ◽  
Fuqiang Guo ◽  
Huimiao Yu
Keyword(s):  
Temperature Changes ◽  
Effects Of Temperature

Comparative Effects of Temperature on the Sodium and Water Permeabilities of the Gills of a Stenohaline Freshwater Fish (Carassius Auratus) and a Stenohaline Marine Fish (Serranus Scriba, Serranus Cabrilla)

1972 ◽  
Vol 57 (2) ◽  
pp. 359-366 ◽  
Author(s):  
J. ISAIA
Keyword(s):  
Freshwater Fish ◽  
Marine Fish ◽  
Osmotic Gradient ◽  
Water Fluxes ◽  
Simple Diffusion ◽  
Temperature Changes ◽  
Diffusional Permeability ◽  
Effects Of Temperature ◽  
Sea Perch ◽  
Branchial Membrane

1. Comparative effects of temperature on the permeability of the gill to water and to sodium were studied in the marine sea perch Serranus and the freshwater goldfish Carassius. 2. The acclimation Q10 for the water fluxes is higher in the freshwater fish than in the marine fish. 3. In the goldfish the osmotic permeability (Pos) is greater than the diffusional permeability (Pdlf) at all acclimation temperatures, suggesting the presence of ‘waterfilled channels’ in the branchial membrane. In the sea perch, on the other hand, Pos/Pdlf is approximately 1, indicating that water movements probably occur by simple diffusion. 4. The permeabilities to water and to sodium are similar in the sea perch but very different in the goldfish. Considering these results together with those from a similar study on an elasmobranch, it would seem that the more perfect the semipermeability of the gill membrane and the weaker the transepithelial osmotic gradient, the greater is the branchial porosity. 5. Assuming that temperature changes do not cause modification of the branchial surface or relative permeabilities to water and to sodium the independence of the temperature-coefficient variations for water and for sodium indicates a certain dissociation between the movements of salt and of water, in the sea perch. In the goldfish, assuming a constant branchial surface and in view of the fact that Pos > Pdif the high temperature coefficients for the water fluxes suggest that the water in the ‘water-filled channels’ is in a highly organized state.

Impact of Internal Thermal Insulation Systems on Static Behaviour of Exterior Walls

2013 ◽  
Vol 649 ◽  
pp. 11-14 ◽  
Author(s):  
Jan Pašek
Keyword(s):  
Climatic Conditions ◽  
The Czech Republic ◽  
Temperature Changes ◽  
Analysis And Evaluation ◽  
Adjacent Structures ◽  
Reduce Heat Loss ◽  
Insulation Systems ◽  
Effects Of Temperature ◽  
Thermal Techniques ◽  
Static Behaviour

In general, in the climatic conditions of the Czech Republic the inner insulation of cladding structures is an unsuitable solution to reduce heat loss of building by means of heat transfer. This statement is valid both in terms of building thermal techniques and also in terms of statics. Research focused on the hygrothermal regime of external walls insulated on the inside is very extensive. On the other hand, the systematic attention is not yet paid to detailed analysis of the consequences of such solution on the static behavior of the cladding structures. The paper focuses on analysis and evaluation of stress increase in external walls and adjacent structures caused by non-forced effects of temperature changes in the environment after the application of internal insulation.

Combined effects of temperature changes and radiation absorption on living tissue

2006 ◽  
Vol 14 (2) ◽  
Author(s):  
NO Egbe ◽  
DU Eduwem ◽  
B Olisemeke ◽  
AO Igiri ◽  
U Mba
Keyword(s):  
Radiation Absorption ◽  
Combined Effects ◽  
Living Tissue ◽  
Temperature Changes ◽  
Effects Of Temperature
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