Professor Stewart Thompson

Recent significant changes to African elephant (Loxodonta africana) populations have placed their management at the centre of the global wildlife conservation management debate, with most of the discussion surrounding population declines. However, in small, invariably fenced reserves found over much of South Africa, their numbers have expanded due to elevated levels of protection from poaching, artificial water provision, high reproductive success and lack of dispersal opportunities. Under these conditions, concerns arise surrounding the negative impacts of elephant feeding behaviour and strategy, with calls from some quarters for intervention options to address this ‘elephant problem’.

Research in a small (380 km2) fenced reserve in the Limpopo province of South Africa was carried out in a variety of habitat and terrain types to assess type and level of elephant impact in relation to tree architecture. Impact was assessed to be predominantly non-lethal, with only a small proportion of surveyed trees assessed to have been lethally impacted upon. Tree species exhibiting certain architectural characteristics, notably trees with a wider canopy measurement than their overall height measurement, were particularly prone to negative feeding impacts, especially damage to primary and secondary branches. Trees with wide basal stem circumferences were most prone to being killed by elephants, with the overall likelihood of a tree experiencing the most severe impact types increasing with basal stem circumference. In contrast, an increase in height was shown to decrease the likelihood of a tree experiencing severe impact types, indicating that tall trees are less likely to suffer mortality due to elephant impact.

We suggest that managers of fenced elephant reserves conduct baseline monitoring of elephant impacts. These studies indicate that width at widest point, and to a lesser extent height at widest point are likely to be useful additions to baseline vegetation monitoring. This will identify the level and type of elephant induced impacts, specifically revealing those locations within fenced reserves with a significant component of target tree species/morphologies. Ultimately this will both initiate and direct preventative management measures, we suggest primarily in the form of exclusion fencing in order to prevent access by elephants.

Large-scale construction activity associated with the enlargement of Abberton Reservoir in Essex, England was calculated, mapped and subsequently modelled to examine the effect of disturbance on four Special Protection Area designated dabbling waterfowl species, Anas strepera (Gadwall), A. clypeata (Shoveler), A. crecca (Teal) and A. penelope (Wigeon). The distribution of each species was compared with levels of construction disturbance and environmental variables using Hurdle Model analysis and spatial referencing.

Numbers of all four species varied throughout the study period with significant increases observed across the reservoir during the four year construction period. Findings show that the most important environmental variable was shallow water with increases in this area of habitat as a result of planned enhancement measures being of particular benefit to Gadwall, Shoveler and Teal. Numbers of Wigeon were especially variable across the site during construction and were displaced from the Main Section during the most disturbing shoreline works, behaviour we attribute to the loss of suitable grazing habitat during the construction process.

While results show some disturbance responses, maintenance of site integrity for all four species is attributed to the overall size of the reservoir complex (4.75 km2) and the phased construction programme which reduced the extent and impact of disturbance. Research presented here provides evidence for a sensitive and science based approach to better deliver conservation and development requirements. The monitoring prior to (2006–2009) and during the construction phase (2010−2013) has enabled the much needed, but often lacking, evidence-based reporting on construction disturbance effects and associated mitigation measures.

This study attempts to determine the procedural effectiveness of EcIA chapters over time by comparing a new review of 112 English EcIA chapters from 2000 onwards with earlier reviews. This was achieved through the novel use of inferential statistics, an approach previously lacking in the EIA and EcIA review literature.

The limitations and advantages of the use of quantitative methods are discussed. In general, there has been an improvement in the information content of EcIA chapters over time, for example in the percentage of EcIA chapters stating the size of the development and estimating the likely effectiveness of proposed mitigation measures. However, the earlier reviews highlighted such severe information deficiencies that the progress seen in the post-2000 EcIA chapter review still leaves considerable scope for improvement.

Changes in the EU’s EIA Directive in force since May 2014 (and to be transposed into Member State legislation by May 2017) have the potential to encourage the use of inferential statistics in EIA and EcIA review: the requirement for Member States to provide central access to EIA information should enable representative samples to be analysed.

The Southern white rhinoceros (Ceratotherium simum) is a threatened species, central to the tourism appeal of private game reserves in South Africa. Privately owned reserves in South Africa tend to be smaller than government run reserves such as Kruger National Park. Because of their relatively small size and the often heterogeneous nature of the landscape private game reserve managers benefit from detailed knowledge of white rhinoceros terrain selection preferences, which can be assessed from their ranging behaviours. We collected adult and sub-adult white rhinoceros distribution data over a 15 month period, calculating individual range size using kernel density estimation analysis within a GIS. From this, terrain selectivity was calculated using 50% and 95% kernels to extract terrain composition values. Jacob’s correction of the Ivlev’s selectivity index was subsequently applied to the terrain composition of each individual to identify trends in selectivity. Results reveal that adult males hold exclusive territories considerably smaller than those found in previous work conducted in “open” or large reserves. Similarly, results for the size of male versus female territories were also not in keeping with those from previous field studies, with males, rather than females, having the larger territory requirement. Terrain selection for both genders and age classes (adult and sub-adult) showed a strong preference for open grassland and avoidance of hill slope and riparian terrains. This research reveals white rhinoceros terrain selection preferences and how they influence range requirements in small, closed reserves. We conclude that this knowledge will be valuable in future white rhinoceros conservation management in small private game reserves, particularly in decisions surrounding removal of surplus individuals or augmentation of existing populations, calculation of reserve carrying capacity and future private reserve acquisition.

Environmental Impact Assessment (EIA) is a key tool to help ensure sustainable built development in more than 200 countries worldwide. Ecology is frequently a component of EIA and early reviews of Ecological Impact Assessment (EcIA) chapters identified scope for improvement at almost every stage of the EcIA process, regardless of country. However, there have been no reviews of UK EcIA chapters since 2000, despite important changes in biodiversity and planning legislation, policy and guidance. In addition, no UK EcIA chapter reviews have attempted to assign a grade or score to EcIA chapters (as has been done for reviews of US, Finnish and Indian EcIA chapters). Furthermore, no EcIA chapter reviews have attempted to use a scoring system to identify which variables determine EcIA chapter information content, beyond straightforward comparisons of EcIA chapters before and after the introduction of guidelines.

A variant of the Biodiversity Assessment Index (BAI) was used to assign scores between zero and one to EcIA chapters based on a series of 47 questions drawn from EU legislation and professional guidance. 112 EcIA chapters for proposed developments that were subsequently granted planning permission in England were assessed. The mean BAI score was less than 0.5, indicating the presence of considerable information gaps in the majority of EcIA chapters.

Of 13 predictor variables identified as having the potential to affect EcIA chapter quality, 10 were identified as significantly related to the BAI scores. A backward stepwise Generalized Linear Model identified the use of professional guidance, the ecological consultancy type and the length of the EcIA chapter as having the greatest combined explanatory power. As a result, several recommendations are made to help improve future EcIA chapter content, including formal EcIA chapter review, publicising the professional guidance to consultants, the provision of training and the introduction of an accreditation scheme for consultants involved in EcIA. 

Overpopulation of African elephants (Loxodonta africana) in fenced reserves in South Africa is becoming increasingly problematic to wildlife managers. With growing opposition to culling and the high cost of translocation, alternative management strategies focusing on male elephants are being investigated. In this study, hormonal treatment via Gonadotropin Releasing Hormone (GnRH) suppression, and surgical treatment via vasectomy were trialled. Focusing on behavioural responses, we tested the male dominance hierarchy for transitivity, and examined the rank order of individuals in relation to age and contraceptive treatment received. Additionally, we studied association patterns between males within the male population and with the female herds.

Findings suggest that the treatment of one individual with GnRH suppressant is affecting the rank order of the dominance hierarchy, though it is still transitive, yet fluid (Landau’s linearity index ), as expected in a normal elephant population. Between males, association patterns were found to be weak. However, some males had relatively strong associations with the female herds, with association indices between 0.25 and 0.41. This suggests that the reduction on births is resulting in the males spending atypically large amounts of time with the female herds. The future conservation implications of this population control mechanism are discussed.

Built development is one of the main drivers of biodiversity loss in the UK. Major built developments usually require an Environmental Impact Assessment (EIA) to be conducted, which frequently includes an Ecological Impact Assessment (EcIA) chapter. By identifying the flaws in EcIA mitigation measure proposals and their implementation in completed developments, it may be possible to develop measures to reduce biodiversity loss and help meet the UK's EU obligation to halt biodiversity loss by 2020.

A review of 112 English EcIAs from 2000 onwards was conducted to provide a broad-scale overview of the information provision and detail of ecological mitigation measures. Audits of seven EIA development case study sites provided finer-scale detail of mitigation measure implementation, and the effectiveness of their grassland and marginal habitat creation and management measures was assessed using standard NVC methodology.

Despite higher than expected levels of mitigation measure implementation in completed developments, EcIA mitigation proposal information and detail has seen little improvement since a 1997 review, and the effectiveness of the habitat mitigation measures studied was poor. This suggests that measures to improve ecological mitigation measures are best targeted at ecological consultants. A recommendation for EcIA-specific training of Competent Authorities is also made.

An understanding of the ecological systems which dictate landscape form and function must be achieved in order to objectively view development led landscape ecological change. Habitat fragmentation, loss and isolation of habitat patches and reduced connectivity are having a significant detrimental effect on the way our landscapes function. A conservation planning tool which considers these issues in tandem with planned landscape level change, whilst incorporating species and habitat specific details, is necessary if we are to ameliorate the ecological impact of built development. A landscape scale modelling approach was developed for a case study area in the South Midlands of the UK to investigate spatial targeting of habitat extension areas. Habitat extension opportunities currently arise as a consequence of existing planning regulations and conditions and are likely to increase as the concept of habitat "banking" is embraced. Ecological networks and ecoprofiles were employed to guide the location of these extension areas via an examination of the landscape ecology effects of area composition, size and location. The ability of extension areas to contribute to landscape functionality was determined spatially. Habitat extension areas identified by the approach increased the existing ecological network size by a factor of over 2.7:1 and were able to deliver the majority of habitat creation targets set out in regional Biodiversity Action Plans (BAPs). 100% of wetland, unimproved grassland and broadleaf and mixed woodland creation targets were met, whilst 75% of the lowland heath target could be achieved. Semi-natural habitat mosaic areas of over 3700 ha which incorporated habitat of more than one type were identified, with such areas determined to be of importance in achieving landscape improvements for a wide range of species. We conclude that rapid assessment tools such as that employed in this research will have increased utility in conservation planning as the British landscape continues to experience both sustained and elevated levels of built development pressure. (C) 2011 Elsevier GmbH.

Rare and threatened habitats in Europe must be restored and enhanced in accordance with the European Union’s Habitats and Species Directive. In the United Kingdom, conservation and expansion objectives for species and habitats are outlined in the Species Action Plans and Habitat Action Plans. Site identification for these measures has to date been ad hoc without consideration of either the existing “stock” of the natural resource or the ability of the surrounding land use to deliver the enhancement (enlargement) of a given habitat. Using a Geographical Information System, we outline a targeting system for creating new woodland in association with existing ancient woodland in the Chiltern Hills Area of Outstanding Natural Beauty. The aim was to create woodland blocks of at least 100 ha, as being of the most benefit to biodiversity. We identified existing patches of woodland between 20 and 50 ha as cores for habitat expansion and classified land use in terms of its suitability and proximity to these core areas for tree planting to meet the targets of the statutory body. Our results suggest that the targeting method employed is a useful tool for habitat restoration.