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Now showing items 2054-2073 of 2233
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Tackling invasive alien species in Europe: the top 20 issues
(Reabic, 2014)Globally, Invasive Alien Species (IAS) are considered to be one of the major threats to native biodiversity, with the World Conservation Union (IUCN) citing their impacts as ‘immense, insidious, and usually irreversible’. ... -
Tall-statured grasses: a useful functional group for invasion science
(Springer, 2019)Species in the grass family (Poaceae) have caused some of the most damaging invasions in natural ecosystems, but plants in this family are also among the most widely used by humans. Therefore, it is important to be able ... -
Tapping into technology and the biodiversity informatics revolution: updated terrestrial mammal list of Angola, with new records from the Okavango Basin
(Pensoft, 2018)Using various sources, including the Global Biodiversity Information Facility (GBIF), published literature, recent (2015–2017) collections, as well as bat detector and camera trap surveys with opportunistic sightings and ... -
Taxonomic revision of the South African mealybug genus Octococcus Hall (Hemiptera: Pseudococcidae)
(Entomological Society of Southern Africa, 2016)A taxonomic revision of the South African mealybug genus Octococcus Hall is presented. Most species of this genus feed on plants in the Asteraceae. Six species are treated, namely, O. barbarae, O. gullanae. and O. warniae ... -
Taxonomic anarchy or an inconvenient truth for conservation? Accelerated species discovery reveals evolutionary patterns and heightened extinction threat in Afro-Malagasy small mammals
(2019)We respond to recent criticisms of supposed “taxonomic anarchy” which is said to hamper conservation efforts. Using examples from African small mammals, we document recent increases of 13% (rodents) and 18% (bats) over the ... -
Taxonomic homogenization and differentiation across Southern Ocean Islands differ among insects and vascular plants
(Blackwell Publishing Ltd, 2010)Aim To investigate taxonomic homogenization and/or differentiation of insect and vascular plant assemblages across the Southern Ocean Islands (SOI), and how they differ with changing spatial extent and taxonomic ... -
Taxonomic homogenization in ungulates: patterns and mechanisms at local and global scales
(Blackwell Publishing Ltd, 2008)Aim The aim of this paper is to examine taxonomic homogenization in ungulates globally and at the local scale in South Africa. Specifically, we aim to examine the roles of distance, scale, time, extinctions vs. ... -
A taxonomic revision of seed harvester ants of the Tetramorium solidum group (Hymenoptera: Formicidae) in southern Africa
(Creative Commons Attribution, 2018)Ants of the Tetramorium solidum group occur in Africa, with the vast majority of species endemic to the arid regions of southern Africa. The first revision of the genus was published more than 30 years ago and ant surveys ... -
A taxonomically and geographically constrained information base limits non-native reptile and amphibian risk assessment: a systematic review
(Creative Commons CC-BY 4.0, 2018)For many taxa, new records of non-native introductions globally occur at a near exponential rate. We undertook a systematic review of peer-reviewed publications on non-native herpetofauna, to assess the information ... -
Taxonomy of the Capensibufo rosei group (Anura: Bufonidae) from South Africa
(Magnolia Press, 2017)A molecular and morphological study of the Mountain Toadlets, previously included in Capensibufo rosei, showed that there are several previously unrecognised species in this group. We describe three new species from the ... -
Taxonomy, phylogeny and biogeography of seed-harvesting ants in the Tetramorium solidum-group (Hymenoptera:Formicidae)
(2014-06-02)Ants emerged during the Cretaceous Period more than 100 million years ago (Grimaldi & Engel 2005; Perrichot et al. 2008) and diversified independently on different landmasses following the Early Cretaceous fragmentation ... -
TEASIng apart alien-species risk assessments: A framework for best practices
(Blackwell Publishing, 2012)Some alien species cause substantial impacts, yet most are innocuous. Given limited resources, forecasting risks from alien species will help prioritise management. Given that risk assessment (RA) approaches vary widely, ... -
Temperate trees and shrubs as global invaders: the relationship between invasiveness and native distribution depends on biological traits.
(Springer, 2014)Many woody plants have been recently recognized as major invasive species with serious impacts on species diversity and functioning of invaded ecosystems. We evaluated the global invasion success of temperate trees and ... -
Temperature effects on fish production across a natural thermal gradient
(John Wiley & Sons Ltd., 2016)Global warming is widely predicted to reduce the biomass production of top predators, or even result in species loss. Several exceptions to this expectation have been identified, however, and it is vital that we understand ... -
Temperature mediates the impact of non-native rainbow trout on native freshwater fishes in South Africa’s Cape Fold Ecoregion
(Springer, 2018)Introduced rainbow trout Oncorhynchus mykiss have invaded many headwater streams in South Africa’s Cape Fold Ecoregion (CFE) and pose arguably the greatest threat to several species of threatened native fishes. Trout impacts ... -
Temperature- and body mass-related variation in cyclic gas exchange characteristics and metabolic rate of seven species: Broader implications
(PERGAMON-ELSEVIER SCIENCE LTD, 2005-07-01)The influence of temperature on metabolic rate and characteristics of the gas exchange patterns of flightless, sub-Antarctic Ectemnorhinus-group species from Heard and Marion islands was investigated. All of the species ... -
Temperature-dependence of metabolic rate in Glossina morsitans morsitans (Diptera, Glossinidae) does not vary with gender, age, feeding, pregnancy or acclimation
(PERGAMON-ELSEVIER SCIENCE LTD, 2005)While variation in metabolic rate at a single temperature can occur for a variety of reasons and the effect of temperature is well established in insects, within-generation variation of metabolic rate-temperature relationships ... -
Temporal and interspecific variation in rates of spread for insect species invading Europe during the last 200 years
(Springer, 2016)Globalization is triggering an increase in the establishment of alien insects in Europe, with several species having substantial ecological and economic impacts. We investigated long-term changes in rates of species spread ... -
Temporal changes in cranial size in South African vlei rats (Otomys): evidence for the ‘third universal response to warming’
(NISC (Pty) Ltd and Taylor & Francis, 2015)Using museum collections and recently collected specimens we studied geographical and temporal (from 1906 to 2013) changes in skull size of two sibling species of rodents, Otomys auratus and O. angoniensis, in northern ... -
Temporal development of hull-fouling assemblages associated with an Antarctic supply vessel
(Inter-Research 2009, 2009-07-02)Introduction of non-native species poses one of the greatest, but least understood threats to marine biodiversity. Whilst considerable research effort has focused on vectors such as ballast water, hull fouling remains ...