Alfan Rija

Alfan Rija
Sokoine University of Agriculture (SUA) | sua · Department of Wildlife Management

PhD

About

36
Publications
21,078
Reads
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203
Citations
Additional affiliations
October 2009 - present
Sokoine University of Agriculture (SUA)
Position
  • Lecturer
Description
  • involved in teaching, research, consultancy and coomunity outreach

Publications

Publications (36)
Article
Full-text available
Background Many species inhabiting Kihansi gorge ecosystem in Southern Udzungwa Mountains, Tanzania are threatened with extinction due to habitat loss caused by constructed hydropower plant that diverted over 90% the water off the Kihansi River. Understanding ecological correlates and structure of an animal community in perturbed ecosystems is an i...
Article
Human exploitation of wildlife is driving some species to severe population decline but, few studies examine the combined effect of hunting, environmental variability and demographic traits on population dynamics of hunted species, making it difficult to design sustainable hunting practices. In this study forty-five model scenarios defined by varyi...
Article
Full-text available
The behaviours of most Afro-tropical birds inhabiting urban landscapes are still poorly understood making species conservation and utilization challenging particularly in increasingly changing cityscapes. This study investigated activity patterns of two sympatric bird species, the Zanzibar red bishop (Euplectes nigroventris) and Black-headed weaver...
Preprint
Full-text available
Background Many species inhabiting Kihansi gorge ecosystem in Southern Udzungwa mountains, Tanzania are threatened with extinction due to habitat loss caused by constructed hydropower plant that diverted over 90% of the water off the Kihansi River. Understanding ecological correlates and structure of an animal community in perturbed ecosystems is a...
Article
Restoration of degraded natural areas to enhance species conservation is widely gaining pace; however, effort assessing restoration impact on the animal community particularly in restored African forests is still rare. We used a capture-mark-recapture method to trap rodents and to assess effect of restoration and ecological covariates on the rodent...
Article
Full-text available
There is a growing body of literature about cane rat species but most of the published work is patchy and current spatial distribution is unknown which limits its wide application in the utilization of the species for the broader commercial game industry and for improving wildlife conservation across Africa. We conducted a systematic review of 56 y...
Article
Full-text available
There is scarce information on the distribution of African clawless otter across many of its range habitats and how humans who mostly use similar resources perceive otters. This information gap precludes efforts to improve conservation of the otters especially in areas increasingly threatened by anthropogenic activities and habitat loss. We used lo...
Chapter
The miombo woodlands play a critical role in providing livelihood services and mitigating the effects of climate change. However, the woodlands are increasingly at risk from human-induced pressures that remove woody species, deplete soil nutrients and alter their ecological integrity. There are also indications that climate change will alter plant...
Article
Full-text available
Illegal hunting is a persistent problem in many protected areas, but an overview of the extent of this problem and its impact on wildlife is lacking. We reviewed 40 years (1980–2020) of global research to examine the spatial distribution of research and socio-ecological factors influencing population decline within protected areas under illegal hun...
Chapter
Full-text available
Poaching is increasingly threatening the survival of numerous species in protected areas. However, information on how poachers work afield is sparse—especially in East Africa. Understanding how and where poachers work is an important step toward improving wildlife ranger patrols and, therefore, success of law enforcement practices. This study used...
Preprint
Full-text available
Illegal activities are a persistent problem in many protected areas, but an overview of the extent of this problem and its impact is lacking. We review 35 years (1980-1914) of research across the globe to examine the spatial distribution of research and socio-ecological factors influencing population decline within protected areas under illegal act...
Research
Full-text available
The critically endangered Kihansi wild coffee Coffea kihansiensis is restricted to only four blocks (ca.17 ha) in Kihansi gorge forest, southern Udzungwa Mountains, Tanzania. But the species is increasingly threatened thereby risk severe population decline and extinction. Drawing effective conservation plan for the species is difficult due to lack...
Article
The persistence of species taxa within fragmented habitats is dependent on the source–sink metapopulation processes, and forest patch size and isolation are key factors. Unveiling species–patch area and/or species–patch isolation relationships may help provide crucial information for species and landscape management. In this study, relationship bet...
Article
Full-text available
Our current understanding of the vertebrate communities of a newly gazetted Tanzanian coastal national park is limited and strongly taxonomically biased towards large mammals. We conducted bird assessments in three sites in Saadani National Park using species lists to analyze some parameters to inform biodiversity conservation in the area. We recor...
Article
Understanding the behavior of species threatened with extinction is important for conservation planning and for solving problems facing species in captivity and the wild. We examined diurnal activity budgets and habitat use of the extinct in the wild Kihansi spray toad to provide insights into ongoing conservation initiatives for this species. Obse...
Article
Full-text available
This study examined the variation in diversity and distribution of avian species across an urban–rural gradient during the wet season in Morogoro municipality and its surroundings. A total of 2547 individuals comprising 86 species belonging to 11 orders and 37 families were recorded across urban-rural habitats. The highest (65) species richness was...
Article
Full-text available
The black rhinoceros have declined across Africa both in numbers and range distribution, making long-term population persistence of this iconic species uncertain. We conducted simulation models to predict population performance of black rhinoceros in Lake Nakuru National Park under different scenarios of environmental variation and translocation re...
Article
Full-text available
Although urban sprawl is increasingly becoming a worldwide problem, the effects associated with urbanization on local biodiversity particularly in the developing countries, is still poorly understood. We investigated plant species richness along urban–rural gradients in an Afro-tropical metropolitan Morogoro city in Tanzania, and examined patterns...
Conference Paper
Full-text available
Although wildfire remains a persistent threat to the forest resources and human livelihood, very limited information exists about the role and performance of existing local governance structures in the prevention and management of wildfires in Miombo woodlands. This study was conducted in nine villages of Handeni, Kilosa and Kilwa Districts, easter...
Article
Full-text available
Tanzania rangelands are a stronghold for biodiversity harbouring a variety of animal and plant species of economic, ecological and socio-cultural importance. Efforts to protect these resources against destruction and loss have involved, among other things, setting aside some tracks of land as protected areas in the form of national parks, nature re...
Article
Full-text available
The tropical forest kapok tree occurs widely in urban environments, dispersing thousands of floss during the fruiting season. However, its seedlings are rarely seen around human settlements, raising questions on what factors might be limiting its recruitment. We examined the pattern of floss release, seed fall post-dispersal and influences of water...
Article
Full-text available
AIM: To investigate the feeding habits of the spider Nephila sp and document its behavioural and ecological aspects in its natural envi-ronment. METHODS: The study was carried out in Naivasha, Kenya within the Elsamere Field Study Centre (EFSC) compound located on the southern waterfront of Lake Naivasha. We used field surveys of insects and food s...
Article
Full-text available
The endemic Coffea kihansiensis was monitored in the Kihansi gorge over a three year period following diversion of the Kihansi River underground for hydropower production and its associated catastrophic effect on the gorge biota. We assessed the growth status of the coffee population by measuring, along an altitudinal gradient, the height and diame...
Article
Full-text available
Although the use of fire as a management tool has increased during the past decades in East African savannas, there is insufficient knowledge about herbivores' utilization of areas with different fire history. We therefore examined large mammal herbivores' preference for patches that differed in fire history to test whether herbivores would non-ran...
Article
Full-text available
Conference Paper
Full-text available
Although species reintroduction has become increasingly a significant conservation tool worldwide, the challenges behind its practice and the cost implication especially in a developing country are increasingly evident. The Kihansi spray toad (Nectophrynoides asperginis) population now extinct in the wild, collapsed following diversion of water for...
Article
Full-text available
Hunting through illegal and legal means is increasingly recognised as a threat to the sustainability of wildlife populations in reserves throughout Africa. Despite this, in Tanzania, legal hunting has persisted and serves as a source of revenue for conserving these species. Poaching remains a major threat to wildlife populations in many parks and r...

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Projects

Project (1)
Archived project
To develop methods to reduce poaching pressure within protected areas