A5019392969- Wildlife Ecology and Conservation
- Rangeland Management and Livestock Ecology
- Conservation, Biodiversity, and Resource Management
- Ecology and Vegetation Dynamics Studies
- Ecology and biodiversity studies
- Economic and Environmental Valuation
- Animal Ecology and Behavior Studies
- Species Distribution and Climate Change
- Land Use and Ecosystem Services
- Coastal wetland ecosystem dynamics
- Wildlife-Road Interactions and Conservation
- Invertebrate Taxonomy and Ecology
- Geology and Paleoclimatology Research
- Marine and coastal plant biology
- Rangeland and Wildlife Management
- Agricultural Innovations and Practices
- Census and Population Estimation
- Bird parasitology and diseases
- African Botany and Ecology Studies
- Forest Management and Policy
- Geological formations and processes
- Bat Biology and Ecology Studies
- Conservation, Ecology, Wildlife Education
- Zoonotic diseases and public health
- Marine and fisheries research
World Conservation Monitoring Centre
2019-2024
University of Groningen
2007-2019
International Union for Conservation of Nature (Bangladesh)
2008
Abstract Animal population dynamics can be driven by changing climatic forcing, shifting habitat conditions, trophic interactions and anthropogenic influences. To understand these influences, we analyzed trends in populations of seven ungulate species counted during 15 years (1989–2003) monthly monitoring using vehicle ground counts the Maasai Mara National Reserve, Kenya. Abundance six declined markedly persistently throughout reserve this period. The declines were contemporaneous with...
Rainfall is the prime climatic factor underpinning dynamics of African savanna ungulates, but no study has analysed its influence on abundance these ungulates at monthly to multiannual time scales.2. We report relationships between rainfall and changes in age-and sex-structured abundances seven ungulate species monitored for 15 years using vehicle ground counts Maasai Mara National Reserve, Kenya.3. Abundance showed strong curvilinear with current cumulative rainfall, older topi, Damaliscus...
Abstract Understanding long‐term climatic variability is basic to wise management and conservation of biodiversity. We analysed temporal variations in the local rainfall, temperature, Normalized Difference Vegetation Index hemispheric El Niño‐Southern Oscillation (ENSO), using Southern how they co varied Mara‐Serengeti ecosystem Kenya Tanzania. Local rainfall showed a striking an evident 5‐year quasi‐periodicity ecosystem. Severe droughts were recurrent/persistent feature but extreme floods...
Wildlife habitats in pastoral lands adjoining protected areas east African savannas are getting progressively degraded, fragmented and compressed by expanding human populations intensification of land use. To understand the consequences these influences on wildlife populations, we contrasted density demography 13 wild three domestic large herbivores between Masai Mara National Reserve ranches using aerial surveys conducted wet dry seasons during 1977–2010. Species different body sizes...
Despite global policy commitments to preserve Earth's marine biodiversity, many species are in a state of decline. Using data on 22,885 species, we identify 8.5 million km2 priority areas that complement existing conservation and biodiversity importance. New priorities found over half (56%) all coastal nations, including key regions the northwest Pacific Ocean Atlantic Ocean. We where different actions, ranging from protected broader approaches, might best overcome anthropogenic threats...
The overlap of large carnivores, livestock and people can engender conflicts that often threaten the future viability carnivore populations in pastoral systems Africa. A playback survey lions Panthera leo, spotted hyenas Crocuta crocuta black-backed jackals Canis mesomelas a transect count wild herbivores was conducted Maasai Mara National Reserve adjoining ranches to assess effect pastoralism protection on density distribution carnivores June 2003. Reliability prey counts depended an...
Ecological immunologists are interested in how immune function changes during different seasons and under environmental conditions. However, an obstacle to answering such questions is discerning the effects of biological factors interest investigation artifacts as handling stress. Here we examined stress its on constitutive (noninduced) via two protocols captive red knots (Calidris canutus). We investigated immunity responds stress, quickly these take place, practical implications for...
Summary 1. The distributions of large herbivores in protected areas and their surroundings are becoming increasingly restricted by changing land use, with adverse consequences for wildlife populations. 2. We analyse changes herbivore hotspots to understand environmental anthropogenic correlates using 50 aerial surveys conducted at a spatial resolution 5 × km 2 ( n = 289 cells) the Mara region Kenya during 1977–2010. compare across seasons, use types (protection, pastoralism agro‐pastoralism)...
Abstract Effective management and conservation of wildlife populations require reliable estimates population size, which can be difficult costly to obtain. We evaluated how precision in herd size abundance varies with sample strip width using two field surveys bootstrap resampling the data. also examined under distance sampling cost‐effectiveness both survey techniques. Precision increased increasing varied independently size. The hazard rate key function was best for five species...
Biodiversity metrics are increasingly in demand for informing government, business, and civil society decisions. However, it is not always clear to end users how these differ or what purpose they best suited. We seek answer questions using a database of 573 biodiversity-related metrics, indicators, indices, layers, which address aspects genetic diversity, species, ecosystems. provide examples indicators their uses within the state–pressure–response–benefits framework that widely used...
We surveyed 335 conservation scientists, from 81 countries, in English, French and Spanish for views on area-based relating to the Strategic Plan Biodiversity 2011-2020 of Convention Biological Diversity potential future targets, especially a successor Aichi Target 11.The results can be summarised as follows: 1.Nearly unanimously, or in-situ is considered important conserve biodiversity (99 per cent).2.All qualitative aspects 11 are well supported, with strongest support areas importance...
Abstract We tested the hypothesis that ungulates time and synchronize births to match gestation lactation with peak food availability quality in seasonal environments, using ground counts of topi warthog conducted over 174 months (July 1989–December 2003) Mara–Serengeti ecosystem. During this 15‐year period, 2,725 newborn 45,574 adult female 933 7,831 warthogs were recorded. Births distinctly synchronized both species but far less so than temperate regions. Extreme droughts delayed onset...
Biodiversity metrics are increasingly in demand for informing government, businesses, and civil society decisions. However, while there many available, it is not always clear to end-users how they differ or what purpose best suited. This confusion undermines uptake. Here, we seek clarify these questions by reviewing presenting a database of 573 biodiversity-related metrics, indicators, indices layers (hereafter ‘metrics’). Of 227 spatial data 272 temporal indicators. Assessed relation the...
Abstract Accurate estimation of wildlife population size is central to effective management and conservation but notoriously difficult for rare cryptic carnivores. Mark–recapture methods can reliably estimate the abundance large carnivores are sensitive departures from assumption equal catchability, which probable territorial social We empirically analysed how pride area, age sex, group lions Panthera leo possession a kill affect performance sight–resight method relative concurrent total...
Abstract Natality and recruitment govern animal population dynamics, but their responses to fluctuating resources, competition, predation, shifting habitat conditions, density feedback diseases are poorly understood. To understand the influences of climatic land use changes on we monitored monthly in births juvenile seven ungulate species for 15 years (1989–2003) Masai Mara Reserve Kenya. Recruitment rates declined all giraffe, likely due alteration increasing vulnerability animals...
The conservation of natural and cultural resources shared between countries is a significant challenge that can be addressed through the establishment transboundary areas (TBCAs). TBCAs enable to harmonize cross-border governance management, increase protected area (PA) coverage, strengthen relationships neighbouring communities. In Africa, many ecosystems species ranges span multiple countries, making crucial tool for biodiversity conservation. However, there lack research on where...
Protected areas and other area-based measures are widely accepted as key elements in biodiversity conservation.However, the diversity inconsistent usage of terms used to describe these have often led confusion.This has sometimes hampered discussions on their role, including Post-2020 Global Biodiversity Framework.Here, we seek provide some clarification most describing different areabased conservation by proposing a typological framework.This framework considers three types, which not...