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harare,
zimbabwe
Hiện ở đây đang là 7:01 SA
Đã tham gia vào tháng 6 20, 2020
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Crispen P.
@cphiri
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harare,
zimbabwe
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Công Việc Hoàn Thành
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Đúng Ngân Sách
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Scientific Researcher & Writer
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Kinh nghiệm
Senior Lecturer
thg 3 2015 - Hiện tại
I am a senior lecturer in the School of Wildlife, Ecology and Conservation. My responsibilities include:
a) Teaching at undergraduate and postgraduate level
b) Supervision of undergraduate and postgraduate theses/dissertations
c) Contributing to course development and development of new programmes
d) Developing research proposals and carrying out research
e) Community engagement and outreach
Senior Lecturer
thg 10 2013 - thg 2 2015 (1 năm, 4 tháng)
I was a senior lecturer in the Faculty of Science. My responsibilities included:
a) Teaching at undergraduate and postgraduate level
b) Supervision of undergraduate and postgraduate theses/dissertations
c) Contributing to course development and development of new programmes
d) Developing research proposals and carrying out research
e) Community engagement and outreach
Research Fellow
thg 8 2002 - thg 7 2013 (10 năm, 11 tháng)
I was research fellow based at the University of Zimbabwe Lake Kariba Research Station. My duties included:
a) Developing research proposals, bidding for research grants and carrying out research
b) Bidding and carrying out consultancy projects
c) Writing or contributing to publications or disseminating research findings
d) Community engagement and outreach
Học vấn
Ph.D (Zoology)
(5 năm)
MSc (Tropical Resource Ecology)
(1 năm)
BSc (Honours in Biological Sciences)
(2 năm)
Nội dung đã đăng
An assessment of the health of two rivers within, Harare, Zimbabwe
African Journal of Aquatic Science (2000), Vol 25, 134–145
This study assessed and compared water quality in the Gwebi and Mukuvisi Rivers using physicochemical variables and macroinvertebrates. Industrial, sewage and domestic pollution had an adverse effect on the water quality of the Mukuvisi River. The study provided evidence that the changes in macroinvertebrate community structure along the Mukuvisi River were due to decline in the water quality. On the Gwebi, water quality was not the main factor determining macroinvertebrate community structure.
The degradation of an urban stream in Harare, Zimbabwe
African Journal of Ecology (2002), Vol 40, pp 401–406
Urbanization has led to deterioration in the quality of water in streams and lakes near urban centres in Africa. Much of the work on aquatic pollution in Zimbabwe has focused on the analysis of physicochemical conditions of water, with the effect on the biota generally being ignored. This study compared the ecology of two rivers, one passing through an urbanized, industrialized and densely populated area while the other river passes through a sparsely populated and non-urbanized farming area.
The impact of water hyacinth in a eutrophic impoundment (Lake Chivero). II. Species diversity
Archiv Fur Hydrobiologie (2003), Vol 158, pp 389–405
We compared abundance and diversity of phytoplankton, zooplankton, and fishes among limnetic (P: always without macrophytes) and littoral habitats with (L+) and without (L–) hyacinths in Lake Chivero, a man-made hypertrophic reservoir near Harare (Zimbabwe). In addition, the littoral macrophyte community, and macro-invertebrates associated with hyacinth mats were inventoried.
Epiphytic diatoms associated with a submerged macrophyte in shallow marginal areas of Lake Kariba
Aquatic Ecology (2007), Vol 41, pp 169–181
Diatom assemblages attached to the leaves of the submerged macrophyte Vallisneria aethiopica in the shallow waters of the Sanyati Basin in Lake Kariba were analysed to assess their response to human impact. We conclude that although there is need for further work, periphytic diatoms associated with V. aethiopica may potentially be useful in assessing ecological conditions or the impact of human activities within the shallow marginal waters of Lake Kariba.
The influence of habitat structure and flow permanence on macroinvertebrate in temporary rivers
Hydrobiologia (2008), Vo 607, pp 199–209
Temporary rivers within the Nyaodza-Gachegache subcatchment in northwestern Zimbabwe were investigated to examine the role of flow permanence and habitat structure on macroinvertebrate community composition. Macroinvertebrate communities of intermittent and ephemeral rivers displayed significant differences in the number of taxa, macroinvertebrate abundance, Shannon and Simpson diversity indices and in size class structure.
Changes in biota along a dry-land river in northwestern Zimbabwe: declines, improvements & landuse
Aquatic Ecology (2009), Vol 43, pp 1095–1106
Macroinvertebrates were sampled from 15 sites along a dry-land river in northwestern Zimbabwe to assess biotic responses to land use changes along the course of the river. The headwater sites were protected by a riparian corridor of native forest, but this was replaced by intensive subsistence agriculture in the mid-reaches while the lower reaches were located within a protected wildlife area with diverse and wide riparian forests.
Potential for Trichoptera communities as biological indicators of degradation in riverine systems
Hydrobiologia (2009), Vol 621, 155–167
Many rivers in southern Africa are increasingly threatened by accelerating geomorphological degradation due to unsustainable agricultural practices and deforestation. Thus, there is a critical need for biological indicators of morphological degradation in running waters. This study analysed the composition and abundance of Trichoptera taxa from 32 sites from rivers in eastern and northwestern Zimbabwe in relation to geomorphological and land use parameters.
Aquatic insects associated with the submerged macrophytes in small fishless ponds
Aquatic Ecology (2011), Vol 45, pp 405–416
The study assessed the composition and abundance of insect assemblages associated with two submerged macrophytes, Lagarosiphon ilicifolius and Vallisneria aethiopica, in fishless ponds.
The effect of plant density on epiphytic macroinvertebrates associated with a submerged macrophyte
African Journal of Aquatic Science (2011), Vol 36, pp 289–297
The effect of variations in the density of a submerged macrophyte, Lagarosiphon ilicifolius, on epiphytic macroinvertebrate community structure in the shallow waters of a sheltered bay of Lake Kariba were investigated. The body size class distributions of a mayfly, Cloeon (Ephemeroptera: Baetidae), and the damselfly family, Coenagrionidae, were also assessed with respect to variation in vegetation density.
Body-size distribution, biomass & life-histories of insects associated with a submerged plant
African Journal of Aquatic Science (2012), Vol 37, pp 289–299
The body-size distributions and biomass estimates of Caenis (Ephemeroptera: Caenidae), Cloeon (Ephemeroptera: Baetidae), Coenagrionidae (Odonata), Micronecta (Hemiptera: Corixidae), Chironominae (Diptera: Chironomidae) and Orthocladiinae (Diptera: Chironomidae), the most common and abundant insect taxa associated with a submerged macrophyte Lagarosiphon ilicifolius in Lake Kariba, are presented.
Macroinvertebrates associated with two submerged macrophytes in the Sanyati Basin, Lake Kariba
African Journal of Aquatic Science (2012), Vol 37, pp 277–288
Vallisneria aethiopica and Lagarosiphon ilicifolius are common and abundant submerged macrophytes in Lake Kariba. The two species have distinct structural morphologies, with Vallisneria consisting of long ribbon-like leaves, while Lagarosiphon has filiform stems with numerous small alternate leaves. This study investigated the effect of these architectural differences between the two plant species on their epiphytic macroinvertebrate assemblages in shallow inshore waters of Lake Kariba.
Benthic diatoms in mountain streams: community structure response to environmental & human pressure
African Journal of Ecology (2013), Vol 51, pp 625–634
The objective of this study was to determine the environmental factors that best explain the distribution and community composition of benthic diatoms in undisturbed mountain streams in the Eastern Highlands of Zimbabwe. Benthic diatoms were sampled during the dry season from 21 sampling sites established along altitudinal gradient of the study rivers.
Invasive Australian crayfish in Lake Kariba: a preliminary survey
African Journal of Aquatic Science (2014), Vol 39, pp 233–236
The is a report of a preliminary field survey done in November and December 2012 on the the invasion by Cherax quadricarinatus, the Australian redclaw crayfish, of the Sanyati Basin of Lake Kariba.
Challenges surrounding water management within Lake Kariba environs
LIT Verlag Münster (ISBN: 978-3-643-90400-3), (2014), pp 38–64
Lake Kariba, a man-made reservoir shared by Zambia and Zimbabwe, was created primarily for hydroelectric power generation, in 1958 by the damming of the Zambezi River. In this chapter, we discuss water with regard to institutional settings and show how it is a central and critical resource in and around Lake Kariba. We argue that water is a political and economic good that requires political goodwill and shared common vision to avoid political conflicts associated with its use and management.
Cross-commons interactions among other aquatic resources within Lake Kariba
LIT Verlag Münster (ISBN: 978-3-643-90400-3), (2014), pp 91–113
A common goal in freshwater conservation and management is to understand how communities are structured in space and time, and are affected by biotic and abiotic factors. This chapter examines the available knowledge on aquatic organisms in Lake Kariba, with the exception of fish assemblages. Aspects of the algal, macrophyte, invertebrates and vertebrate assemblages are discussed, their ecological, social and economic importance, and response to human activities.
Diet composition changes in tigerfish of Lake Kariba following invasion by redclaw crayfish.
International Journal on Limnology (2017), Vol 53, pp 47–56.
This study used a combination of stable isotope techniques and stomach content analyses to examine the diet and ontogenetic diet shifts of tigerfish, Hydrocynus vittatus, in the Sanyati basin of Lake Kariba, Zimbabwe. We compared tigerfish diet shifts in the presence of an invasive crayfish, Cherax quadricarinatus, with previous studies before invasion. We assessed whether tigerfish now had a preference for C. quadricarinatus leading to a shift in its main food source from cichlids to crayfish.
Distribution of functional feeding groups of aquatic macroinvertebrates & ecosystem integrity
Journal of Biodiversity and Environmental Sciences (2018), 13, pp 16–33
Knowledge of functional feeding groups (FFGs) is key in understanding energy flow and matter transfer in lotic systems. The River Continuum Concept (RCC) model attempts to capture this flow by looking at the distribution of FFGs. We assessed the ecosystem integrity of Tokwe River, Zimbabwe, and whether it conforms to the RCC by analyzing macroinvertebrates from three zones along the river.
The diet of an invasive crayfish, Cherax quadricarinatus, in Lake Kariba
BioInvasions Records (2018) Vol 7, Issue 2, pp 121–132
The diet of an invasive crayfish, Cherax quadricarinatus (Von Martens 1868), in Lake Kariba, was investigated using stomach content analysis (SCA) and stable isotope analysis (SIA).
Fish catches, and the influence of climatic and non-climatic factors in Lakes Chivero and Manyame
Cogent Food & Agriculture (2018), 4: 1435018
Inland fisheries provide income, food security and nutrition and act as a labour buffer. Yet they scarcely receive consideration in water resource allocation and economic decisions. Inland peri-urban fisheries face many challenges such as urban encroachment, environmental degradation and climate change. This study assessed the historical fish catches, species composition, and the effects of climatic variability and catchment dynamics in peri-urban Lakes Chivero and Manyame in Zimbabwe.
Metal accumulation in two contiguous eutrophic peri-urban lakes, Chivero and Manyame, Zimbabwe
African Journal of Aquatic Science (2018), Vol 43, pp 1 - 15
Concentrations of aluminium, cadmium, chromium, cobalt, copper, iron, lead, nickel and zinc were determined in surface water, benthic sediments, and the gills, liver and stomach muscle tissues of Oreochromis niloticus and Clarias gariepinus in peri-urban lakes Chivero and Manyame, Zimbabwe.
Nutritional compositions of Japanese quail (Coturnix japonica) raised on a basal poultry ration
Cogent Food & Agriculture (2018), 4: 1473009
Proximate composition experiments were conducted to determine nutritional compositions of eggs from three Japanese quail breeds (Jumbo Pharaoh, A&M giant and Manchurian golden) raised under farm conditions in Zimbabwe.
Dry season pre-impoundment water-quality & effects of anthropogenic activities: Tokwe river, Zimbabw
Zimbabwe Journal of Science & Technology (2019), Vol 14, pp 1 - 20
Damming of rivers and the subsequent increase in human activities bring adverse changes to aquatic systems both downstream and upstream of the impoundment. Changes in physicochemical water quality are one such adverse change usually associated with impoundments, but, in Africa, no prior characterisation of the water body is usually done to provide baseline data. This was a pre-impoundment study to assess the water quality of Tokwe River, Zimbabwe, in the cold dry and hot dry seasons.
Vulnerability of fisherfolks and their perceptions towards climate change & impacts on livelihoods
Environment, Development and Sustainability (2019), Vol 21, pp 917–934
Peri-urban fisheries- and fishing-dependent livelihoods face multiscalar threats of climate change, water pollution, transforming land initiatives and volatile markets. The objectives of this study were to assess the livelihood strategies and assets as well as the vulnerability of peri-urban fisherfolks in Lakes Chivero and Manyame, Zimbabwe. Furthermore, the study investigated the perceptions of fisherfolks towards climate change and its effects on their livelihoods.
Histological alterations of selected tissues in two common fish species within two eutrophic lakes
African Journal of Aquatic Science (2019), Vol 44, pp 155 - 162
Pollution threatens fish health in the eutrophic lakes, Chivero and Manyame, in Zimbabwe. Histopathological tissue alterations of two commonly consumed fish: catfish, Clarias gariepinus, and; tilapia, Oreochromis niloticus, from Lakes Chivero and Manyame were assessed between 2015 and 2016.
Drivers and barriers to sustainable fisheries in two peri-urban impoundments in Zimbabwe
Water SA (2019), Vol. 45, pp 560 - 567
Two inland peri-urban impoundments, Chivero and Manyame in Zimbabwe, support numerous small-scale fisheries; however, environmental and socioeconomic variables threaten the sustainability of the fisheries. This study aimed to identify and contextualise drivers and barriers to sustainability of small-scale fisheries in these two peri-urban impoundments.
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