Ryan Wasserman



PhD (Rhodes University, South Africa)
Telephone: +603 5514 6000
Ext: 44463 (DID: 5514 4463)
Room number: 4-8-28

  • Aquatic Ecology
  • Trophic Ecology
  • Aquatic Ecology
  • Predator-prey interactions
  • Trophic Ecology/food webs

Wasserman RJ, Alexander M, Dalu T, Ellender BR, Kaiser H, Weyl OLF (in press). Using functional responses to quantify interaction effects among predators. Functional Ecology doi: 10.1111/1365-2435.12682.

Wasserman RJ, Alexander M, Dalu T, Weyl OLF, Barrios-O’Neill D, Froneman PW (2016). Emergent impacts of structural complexity and temperature on notonectid-daphnia predator-prey dynamics. Ecosphere 7 (2), E01239.10.1002/ECS2.1239.

Wasserman RJ, Alexander M, Barrios-O’Neill D, Weyl OLF, Dalu T (2016). Using functional responses to assess predator hatching phenology implications for pioneering prey in arid temporary pools. Journal of Plankton Research 38, 154-158. DOI: 10.1093/plankt/fbv114.

Dalu T, Dube T, Sachikonye MTB, Froneman PW, Manungo KI, Bepe O, Wasserman RJ (2016). Ecological assessment of two species of potamonautid freshwater crabs from the Eastern Highlands of Zimbabwe, with implications for their conservation. PLOS ONE 11, e0145923. doi:10.1371/journal.pone.0145923.

Dalu T, Froneman PW, Weyl OLF, Wasserman RJ (2016). Trophic interactions in an austral temperate ephemeral pond inferred using stable isotope analysis. Hydrobiologia 768, 81-94. DOI 10.1007/s10750-015-2533-5.

Ellender BR, Wasserman RJ, Ndaleni PM, Mofu L, Wu A, Weyl,OLF (2016). Reporting by-catch and mortalities in targeted biological field surveys on fishes. Aquatic Conservation: Marine and Freshwater Ecosystems 26, 596-601.  DOI: 10.1002/aqc.2613.

Ellender BR, Wasserman RJ, Chakona A, Skelton PH, Weyl OLF (accepted). A knowledge review on endemic and near endemic Cape Fold ecoregion fishes. Aquatic Conservation: Marine and Freshwater Ecosystems.

Bennett R, Ellender BR, Mäkinen T, Miya T, Pattrick P, Wasserman RJ, Woodford, D.J., Weyl, O.L.F. (accepted). Ethical considerations for field research on fishes. Koedoe. Accepted.

Wasserman RJ, Matcher GF, Vink TMF, Froneman PW (2015). Preliminary evidence for the organisation of a bacterial community by zooplanktivores at the top of an estuarine planktonic food web. Microbial Ecology 69, 245-253. doi: 10.1007/s00248-014-0505-3.

Wasserman RJ, Froneman PW, Vink TMF, Dalu T (2015). Fish predation regimes modify benthic diatom community structures: experimental evidence from an in situ mesocosm study. Austral Ecology 40, 806-815.doi: 10.1111/aec.12255.

Wasserman RJ, Vink TMF, Woodford D, Froneman PW (2015). Spawning and nest guarding of the river goby (Glossogobius callidus) from the Eastern Cape province of South Africa. African Journal of Ecology 53, 609-612. doi: 10.1111/aje.12228.

Kramer R, McQuaid C, Vink TMF, Mostert B, Wasserman RJ (2015). Utilisation of mangrove crab-burrow micro-habitats by the goby Redigobius dewaali: evidence for dominance hierarchy. Journal of Experimental Marine Biology and Ecology 462, 1-7. doi: 10.1016/j.jembe.2014.10.012.

Suárez-Morales E, Wasserman RJ, Dalu T (2015). A new species of Lovenula Schmeil (Copepoda, Calanoida, Diaptomidae) from the Eastern Cape Province of, South Africa. Crustaceana 81, 324-342.

Weyl OLF, Ellender BR, Wasserman RJ, Woodford DJ (2015) Unintended consequences of using invasive alien fish for human benefit in Protected Areas. Koedoe 57, doi: 10.4102/koedoe.v57i1.1264.

Dalu T, Wasserman RJ, Jordaan M, Froneman PW, Weyl OLF (2015). An assessment of the effects of rotenone on selected non-target aquatic fauna. PLOS ONE 10, e0142140. doi:10.1371/journal.pone.0142140.

Wasserman RJ, Mostert BP (2014). Intertidal crab burrows as low-tide refuge habitat for a specific gobiid: preliminary evidence for commensalism. Marine and Freshwater Research 65, 333-336.

Wasserman RJ, Kramer R, Vink TMF, Froneman PW (2014). Conspecific alarm cue sensitivity by the estuarine calanoid copepod, Paracartia longipatella. Austral Ecology 39, 732-738. doi:10.1111/aec.12135.

Wasserman RJ, Vink TMF, Kramer R, Froneman PW (2014). Hyperbenthic and pelagic predators regulate alternate key planktonic copepods in shallow temperate estuaries. Marine and Freshwater Research 65, 791-801. doi:10.1071/MF13233.

Wasserman RJ, Vink TMF (2014). Effect of male post-copulatory mate guarding on the swimming behaviour of female Euterpina acutifrons. Journal of Plankton Research 36, 1385-1390. doi:10.1093/plankt/fbu046.

Wasserman RJ, Froneman PW (2013). Risk effects on copepods: suppression of egg production in the presence of predatory early life-history fish. Journal of Plankton Research 35, 421-426.

Wasserman RJ, Noyon M, Avery TS, Froneman PW (2013). Trophic level stability inducing effects of predaceous early juvenile fish in an estuarine mesocosms study. PLOS ONE 8, e61019.

Wasserman RJ (2012). Feeding ecology of the early life-history stages of two dominant Gobiid species in the headwaters of a warm-temperate estuary. Estuarine, Coastal and Shelf Science 109, 11-19.

Wasserman RJ, Weyl OLF, Pereira-da-Conceicoa LL, Strydom NA (2012). The diet of Anguilla mossambica (Anguillidae) elvers of the Sundays River, Eastern Cape, South Africa. African Journal of Aquatic Science 37, 347-349.

Wasserman RJ, Strydom NA (2011). The importance of estuary head waters as nursery areas for young estuary- and marine-spawned fishes in temperate South Africa. Estuarine, Coastal and Shelf Science 94, 56-67. 

Wasserman RJ, Weyl OLF, Strydom NA (2011). The effects of in-stream barriers on the distribution of migratory marine-spawned fishes in the lower reaches of the Sundays River, South Africa. Water SA 37, 495-504.

Wasserman RJ, Strydom NA, Weyl OLF (2011). Diet of largemouth bass, Micropterus salmoides (Centrarchidae) in the lower reaches of an Eastern Cape River, South Africa. African Zoology 46, 378-386.

Wasserman RJ, Strydom NA, Wooldridge TH (2010). Larval fish dynamics in the Nxaxo-Ngqusi Estuary Complex in the warm temperate- subtropical transition zone of South Africa. African Zoology 45, 63-77

MSc Students (Present)

  • Phumza Ndaleni
  • Nokubonga Mbandzi
  • Bayanda Sonamzi

Honours Students (Completed)

  • Rachel Kramer
  • Mark Weston
  • Bronze Medal student award “awarded irregularly in recognition of the exceptionally high standard of a specific piece of work by a junior scientist or manager. This work shall normally be in the form of a dissertation” (as extracted from the South African Society for Aquatic Sciences SASAqS Constitution, 2013)
  • Merit Award for Research Excellence (South African Institute for Aquatic Biodiversity SAIAB, 2016)

Professional membership

  • British Ecological Society
  • South African Society for Aquatic Sciences (SASAqS)