6 research outputs found
Review of Maintenance Strategies For Achieving Sustainable Developments In Tropical Climates
Buildings, like almost all physical objects degrade over time due to a combination of factors. The deterioration affects all components and parts of the building in different ways, gradually reducing the quality of the structure and adversely impacting the building’s ability to effectively perform its basic functions in an environment. This paper relied on a systematic review of published literatures in reputable databases to examine how building developments and public environments can be designed in tropical climates to require minimal maintenance activities to enhance the ease of executing such activities. 39 open access published documents were reviewed. Data sieved from the publications were content analysed and descriptively presented in themes. The study identified principles and methods which can be implemented in the design of buildings with a focus on maintainability towards enhancing the development of sustainable public buildings and environments in tropical climates. The review promotes maintenance culture and emphasises increased consideration for maintenance in building design, which further helps to promote the eleventh target of the 17 Sustainable Development Goals that aims at the development of resilient, safe and sustainable communities, cities and human settlements. The paper is instructive to researchers, scholars, students of architecture and building design, as well as policy makers on issues surrounding the principles of designing for maintainability, particularly in tropical settings
Reproductive biology of Chromidotilapia guntheri (Sauvage, 1882) (Cichlidae, Perciformes) in four coastal rivers (Ehania, Noé, Soumié and Eholié) of Côte d’Ivoire in West Africa
The reproductive activities of a small Cichlid Chromidotilapia guntheri
were investigated from July 2003 to March 2005 in four coastal rivers (Ehania,
Eholié, Noé and Soumié), in the southeast of Côte d’Ivoire. Trends in gonadosomatic
indices and reproductive stages of development suggested that C. guntheri
is a multiple (fractional) spawner and breeds all year round with little
fluctuation in spawning intensity. However, spawning activities were more intensive in
August and September. The estimated mean standard length at first maturity did not differ
significantly between rivers. It was, in the overall population, 85.53 mm SL for males and
100.13 mm SL for females. In general, the sex ratio differed from 1:1 with the
predominance of the males in rivers, standard length classes, seasons and the entire
population. Absolute fecundity (F) varied from a minimum of 70 to a maximum of 470 eggs.
The range of variation in the relative fecundity was from 3066 to 9135 eggs per kilogram
of fish in the total population. Fecundity did not differ extensively between rivers. The
absolute fecundity relations to fish standard length (SL) and eviscerated weight (We) were
best described in the whole population by the following equations: F = 0.00069 ×
SL2.72 and F = 2.54 × We1.15, respectively. Moreover, there was no
relationship between absolute fecundity and oocyte diameter
Reproductive biology of
The reproductive activities of a small Cichlid Chromidotilapia guntheri
were investigated from July 2003 to March 2005 in four coastal rivers (Ehania,
Eholié, Noé and Soumié), in the southeast of Côte d’Ivoire. Trends in gonadosomatic
indices and reproductive stages of development suggested that C. guntheri
is a multiple (fractional) spawner and breeds all year round with little
fluctuation in spawning intensity. However, spawning activities were more intensive in
August and September. The estimated mean standard length at first maturity did not differ
significantly between rivers. It was, in the overall population, 85.53 mm SL for males and
100.13 mm SL for females. In general, the sex ratio differed from 1:1 with the
predominance of the males in rivers, standard length classes, seasons and the entire
population. Absolute fecundity (F) varied from a minimum of 70 to a maximum of 470 eggs.
The range of variation in the relative fecundity was from 3066 to 9135 eggs per kilogram
of fish in the total population. Fecundity did not differ extensively between rivers. The
absolute fecundity relations to fish standard length (SL) and eviscerated weight (We) were
best described in the whole population by the following equations: F = 0.00069 ×
SL2.72 and F = 2.54 × We1.15, respectively. Moreover, there was no
relationship between absolute fecundity and oocyte diameter
Macroinvertebrate communities associated with macrophyte habitats in a tropical man-made lake (Lake Taabo, Côte d’Ivoire)
An ecological study was done on Lake Taabo with the main objective of characterising
macroinvertebrate communities associated with the microhabitats created mainly by
Eichhornia crassipes and other littoral native macrophytes. We sampled
organisms in patches of those aquatic macrophytes. Also, some abiotic variables
(temperature, transparency, turbidity, pH, TDS, conductivity, dissolved oxygen,
NH+4,
NO−3,
NO−2,
PO3−4 and
SiO−2) were measured. Overall, forty-three taxa of
macroinvertebrates were identified. Ten of them were exclusively associated with water
hyacinth while five were only associated with littoral macrophytes. Macroinvertebrate taxa
with some of the highest family richness were Gastropoda, Coleoptera, Heteroptera, Odonata
and Diptera. The taxon with highest density in both microhabitats was Chironomidae.
Although higher values of taxonomic richness (Rs), the Shannon index
(H′) and evenness (J) were obtained with
the water hyacinth habitat, significant differences between the two microhabitats were not
observed. Canonical Correspondence Analysis revealed that samples of E. crassipes
collected in the dry season were characterised by Gastropoda and Odonata, as well
as higher values of transparency and ammonia-nitrogen. Baetidae, Hydrophilidae,
Chironomidae, Ceratopogonidae, Coenagrionidae, Naucoridae and Ostracoda were most abundant
in both E. crassipes and littoral macrophyte habitats during the rainy
season. This season was characterised by higher levels of nitrates and conductivity
Macroinvertebrate communities associated with macrophyte habitats in a tropical man-made lake (Lake Taabo, Côte d’Ivoire)
An ecological study was done on Lake Taabo with the main objective of characterising
macroinvertebrate communities associated with the microhabitats created mainly by
Eichhornia crassipes and other littoral native macrophytes. We sampled
organisms in patches of those aquatic macrophytes. Also, some abiotic variables
(temperature, transparency, turbidity, pH, TDS, conductivity, dissolved oxygen,
NH,
NO,
NO,
PO and
SiO were measured. Overall, forty-three taxa of
macroinvertebrates were identified. Ten of them were exclusively associated with water
hyacinth while five were only associated with littoral macrophytes. Macroinvertebrate taxa
with some of the highest family richness were Gastropoda, Coleoptera, Heteroptera, Odonata
and Diptera. The taxon with highest density in both microhabitats was Chironomidae.
Although higher values of taxonomic richness (Rs), the Shannon index
(H′) and evenness (J) were obtained with
the water hyacinth habitat, significant differences between the two microhabitats were not
observed. Canonical Correspondence Analysis revealed that samples of E. crassipes
collected in the dry season were characterised by Gastropoda and Odonata, as well
as higher values of transparency and ammonia-nitrogen. Baetidae, Hydrophilidae,
Chironomidae, Ceratopogonidae, Coenagrionidae, Naucoridae and Ostracoda were most abundant
in both E. crassipes and littoral macrophyte habitats during the rainy
season. This season was characterised by higher levels of nitrates and conductivity