FRESHWATER SCIENCE

Research | Ecology | Conservation

FEATURED PROJECTS

Fynbos Fish Revival (FFR)

Freshwater fishes are South Africa’s most threatened species group, and urgent conservation action is needed to prevent species extinctions in our lifetime. Fynbos Fish Revival is a collaborative initiative that works with local communities and land owners to restore aquatic ecosystems conserve threatened freshwater fish species in South Africa’s Cape Floristic Region Biodiversity Hotspot.

Freshwater Biodiversity Information System (FBIS)

The Freshwater Biodiversity Information System (FBIS) is an online platform for housing and sharing freshwater biodiversity data in South Africa. We can only manage what we measure, and the FBIS aims to provide current and reliable data on changes in aquatic ecosystems to local freshwater decision-makers.

Living Labs

Connecting South Africa’s youth to rivers one school at a time. Living Labs is the outdoor education node of the Freshwater Research Centre. It is is a positive reaction to the problem of growing global disconnect between young people and nature, as well as the challenge of conserving river ecosystems –arguably South Africa’s most valuable natural resource.

MY RESEARCH

Scientific papers and book chapters

Shelton JM, Day JA & Griffiths CL (2008) Influence of largemouth bass, Micropterus salmoides, on abundance and habitat selection of Cape galaxias, Galaxias zebratus, in a mountain stream in the Cape Floristic Region, South Africa. African Journal of Aquatic Science 33(3)

Shelton JM, Samways MJ & Day (2014) Predatory impact of non-native rainbow trout on endemic fish populations in headwater streams in the Cape Floristic Region of South Africa. Biological Invasions. Doi: 10.1007/s10530-014-0735-9

Shelton, JM, Impson ND & Day JA (2014) Preliminary evaluation of the impact of invasive smallmouth bass on native fish abundance in the Witte River, Cape Floristic Region, South Africa. African Zoology, 49:277-282

Shelton JM, Samways MJ & Day (2015) Non-native rainbow trout change the structure of benthic communities in streams of the Cape Floristic Region, South Africa. Hydrobiologia. DOI 0.1007/s10750-014-2067-2

Shelton JM, Woodford DJ, Samways MJ & Day JA (2016) Are native cyprinids or introduced salmonids stronger regulators of benthic invertebrates in South African headwater streams? Austral Ecology. DOI: 10.1111/aec.12352

Shelton JM, Clark BM, Sephaka T & Turpie JK (2016) Population crash in Lesotho's endemic Maloti minnow Pseudobarbus quathlambae following invasion by translocated smallmouth yellowfish Labeobarbus aeneus. Aquatic Conservation. DOI: 10.1002/aqc.2633

Shelton JM, Bird MS, Samways MJ & Day JA (2016) Non-native rainbow trout (Oncorhynchus mykiss) occupy a different trophic niche to native Breede River redfin (Pseudobarbus burchelli) which they replace in South African headwater streams. Ecology of Freshwater Fish, 26: 484-496

Shelton JM, Impson DI, Graham S & Esler KJ (2017) Down, but not out: rapid recent decline of Berg-Breede River whitefish (Barbus andrewi) in the upper Hex River, South Africa. Koedoe. Doi: 10.4102/koedoe.v59i1.1398

Shelton J, Weyl O, Van Der Walt J, Marr S, Impson D, Maciejewski K, Tye D, Dallas H, Esler K (2017) Effect of an intensive mechanical removal effort on a population of non-native rainbow trout Oncorhynchus mykiss in a South African headwater stream. Aquatic Conservation. DOI: 10.1002/aqc.2752

Shelton J, Chakona A, Ellender B, Esler K, Impson D, Jordaan M, Marr S, Ngobela T, Paxton B, Van der Walt J, Weyl O & Dallas H (2017) Vulnerability of Cape Floristic Region freshwater fishes to climate change and other human impacts. Aquatic Conservation, 28: 68-77

Shelton JM, Weyl O L F , Esler K J, Paxton BR, Impson DN and Dallas HF (2018) Temperature mediates the impact of non-native rainbow trout on native freshwater fishes in South Africa’s Cape Fold Ecoregion. Biological Invasions https://doi.org/10.1007/s10530-018-1747-7

Shelton JM, Bird MS and Marr SM (2018) Evidence for diet partitioning among three coexisting native freshwater fishes in South Africa's Cape Fold Ecoregion. African Journal of Aquatic Science, 43: 89–100 DOI:10.2989/16085914.2018.1470490  

Avidon S, Shelton JM, Marr SM, Wey OLF, Bellingan TA, Esler KJ (2018) Preliminary evaluation of non-native rainbow trout (Oncorhynchus mykiss) impact on the Cedarberg ghost frog (Heleophryne depressa) in South Africa’s Cape Fold Ecoregion. African Journal of Aquatic Science. Accepted

Reizenberg JL, Bloy LE, Weyl OLF, Shelton JM and Dallas HF (2019) Variation in thermal tolerances of native freshwater fishes in South Africa's Cape Fold Ecoregion: examining the east-west gradient in species' sensitivity to climate warming. Journal of Fish Biology 94(1): 103-112

Shelton JM (2019) Swimming dangerously close to Extinction: Population Crash in Lesotho’s Endemic Maloti Minnow. A Primer of Conservation Biology, 5th Edition.

Impson ND & Shelton JM (2019) Trouts of Africa: A mixed blessing for its people and the natural environment. Trouts of the World. 831pp

Olsen T, Shelton JS and Dallas HF. 2021. Does thermal history influence thermal tolerance of the freshwater fish Galaxias zebratus in a global biodiversity hotspot? Journal of Thermal Biology Volume 97, April 2021, 102890.

Cerrilla C, Afrika J, Impson D, Jordaan MS, Kotze N, Paxton BR, Reed C, Schumann, van der Walt JA and Shelton JM. 2022. Rapid population decline in one of the last recruiting populations of the endangered Clanwilliam sandfish (Labeo seeberi): The roles of climate change and non-native fish. Aquatic Conservation: Marine and Freshwater Ecosystems DOI: 10.1002/aqc.3785.

Dallas HF, Shelton JM, Sutton T, Tri Cuptura D, Kajee M and Job N. 2021. The Freshwater Biodiversity Information System (FBIS) – mobilising data for evaluating long-term change in South African rivers. African Journal of Aquatic Science DOI: 10.2989/16085914.2021.1982672.

Kajee M, Henry DA, Dallas H, Griffiths CL, Pegg J, Van Der Colff D, Impson D, Chakona A, Raimondo DC, Job N, Paxton B, Jordaan MS, Bills R, Roux F, Zengeya TA, Hoffman A, Rivers-Moore N, Shelton JM. 2023. How the Freshwater Biodiversity Information System (FBIS) is supporting national freshwater fish conservation decisions in South Africa. Frontiers in Environmental Science. 11. DOI: 10.3389/fenvs.2023.1122223/abstract.

Kajee M, Dallas HF, Swanepoel A, Griffiths CL and Shelton JM. 2023. The Freshwater Biodiversity Information System (FBIS) fish data: a georeferenced dataset of freshwater fishes occuring in South Africa. Journal of Limnology.

Selected photo stories

Clear Water Revival (bioGraphic Magazine, 2022)

The unprecedented effort to save one of Africa's most threatened fish (National Geographic, 2022)

Underwater photos showcase one of the world’s most-threatened ecosystems (CNN, 2022)

Giant Redfin: Conserving South Africa's Native Fish (The Nature Conservancy, 2022)

Safe havens: Conserving endangered Clanwilliam sandfish, pool by pool (UCT News, 22 April 2022)

Red die onderbekvis (Landbou Weekblad, 22 April)