More information:

Elwen, S.H., Leeney, R.H. and Gridley, T. 2019. Abundance estimates of an isolated population of common bottlenose dolphins Tursiops truncatus in Walvis Bay, Namibia, 2008–2012. African Journal of Marine Science, 41(1): 61-70


Description:

Abundance estimates of an isolated population of common bottlenose dolphins Tursiops truncatus in Walvis Bay, Namibia, 2008–2012.

Summary / Notes:

The coastal population of common bottlenose dolphins Tursiops truncatus found in Namibia is regionally isolated and unique. This population faces several potential anthropogenic threats, especially in Walvis Bay, including boat-based tourism, a commercial harbour undergoing expansion, and aquaculture for oysters and mussels. Between 2008 and 2012, 238 boat-based surveys were conducted, resulting in 170 encounters with bottlenose dolphins. Overall, group sizes varied from 1 to 45 individuals (mean 10.7). Encounter rates, group sizes and total numbers of animals identified were higher in winter than in summer field seasons. The number, and survival and immigration parameters, of bottlenose dolphins using Walvis Bay was investigated using robust design and Huggins closed-population mark-recapture models. The highest numbers estimated were in the first and last years of the study, with estimates of 74–82 in 2008 and 76–77 in 2012 (numbers identified and upper 95% confidence limits). The only previously available data, from an incomplete study in the early 1990s, suggested that the population was between 100 and 150 individuals at the time. Although no linear trend in population size was obvious during the current study, the clear evidence of isolation, small population size, low annual birth rate, and potential long-term decrease in numbers since the early 1990s is concerning. Further work to collect data on demographic parameters is urgently recommended with a view to obtaining increased protection for this species. Keywords: Africa, cetaceans, closed population model, conservation, demographic parameters, mark-recapture, photo-identification, robust design model.

Year: 2019

Type: Journal Article

Download: Tursiops truncatus in Walvis Bay.pdf (2.8 mb)

Preview: Preview this file


Top 50 related results:

You may also be interested in the following items which are on a similar or related topic, listed in order of similarity.

Results per page:

Results: 1 to 50 of 50

To FILTER: Use the pale green row to filter the results on this page. Type in text or select from the year list.

Rows matching filter(s): All
What is this row? 
Data titleYearOriginFile typeDownloadkml/kmz
McBride, C.J. 1984. Age and size categories of lion prey in Chobe National Park, Botswana. Botswana Notes and Records, 16: 139-143
  » More info & related results
1984 Journal Article
Mendelsohn, J. 2016. Assorted observations and ideas on animal movements. RAISON. Symposium on animal movements & satellite tracking in Namibia, November 2016
  » More info & related results
2016Symposium on animal movements & satellite tracking in Namibia, November 2016Presentation8.35 mb pptx
Stander, P. 2001. Population ecology and long term monitoring of free-ranging populations in Namibia's marginal and arid environments. Predator Research Programme, Research Progress Report, May 2001
  » More info & related results
2001 Report1.08 mb pdf
Preview
Stander, P. and Hanssen, L. 2000. Population ecology and long term monitoring of free-ranging populations in Namibia's marginal and arid environments. Predator Research Programme, Research Progress Report, October 2000
  » More info & related results
2000 746 kb pdf
Preview
Stander, P. 2000. Conservation of lions and other large carnivores in the Kunene Region, Namibia: Population ecology and long term monitoring of free-ranging populations in a marginal and arid environment. Quarterly Report, January 2000
  » More info & related results
2000 Report638 kb pdf
Preview
Elwen, S.H., Leeney, R.H. and Gridley, T. 2019. Abundance estimates of an isolated population of common bottlenose dolphins Tursiops truncatus in Walvis Bay, Namibia, 2008–2012. African Journal of Marine Science, 41(1): 61-70
  » More info & related results
2019 Journal Article2.8 mb pdf
Preview
Simmons, R.E., Cordes, I. and Braby, R. 1998. Latitudinal trends, population size, and habitat preferences of the Damara Tern Sterna balaenarum on Namibia's desert coast. Ibis, 140(3): 439-445
  » More info & related results
1998Bibliography compiled by Bird Database ProjectJournal Article
Kirkman, S.P., Oosthuizen, W.H., Meÿer, M.A., Kotze, P.G.H., Roux, J-P. and Underhill, L.G. 2007. Making sense of censuses and dealing with missing data: trends in pup counts of Cape fur seal Arctocephalus pusillus pusillus for the period 1972–2004. African Journal of Marine Science, 29(2): 161–176
  » More info & related results
2007 Journal Article283 kb pdf
Preview
Gosling, L.M. 2012. Mark-recapture estimate of mountain zebras in Etosha National Park
  » More info & related results
2012 Report552 kb pdf
Preview
Joubert, E. 1974. Composition and limiting factors of a Khomas Hochland population of Hartmann zebra Equus zebra hartmannae. Madoqua, 1(8): 49-54
  » More info & related results
1974 Journal Article903 kb pdf
Preview
Joubert, E. 1974. Size and growth as shown by pre and post natal development of the Hartmann zebra Equus zebra hartmannae. Madoqua, 1(8): 55-58
  » More info & related results
1974 Journal Article877 kb pdf
Preview
Carter, K.D., Seddon, J.M., Frère, C.H., Carter, J.K. and Goldizen, A.W. 2013. Fission–fusion dynamics in wild giraffes may be driven by kinship, spatial overlap and individual social preferences. Animal Behaviour, 85(2): 385–394
  » More info & related results
2013 Journal Article
Craig, G.C. and Gibson, D.S.C. 2013. Aerial survey of wildlife in Khaudum National Park and neighbouring conservancies - September 2013. WWF in Namibia, Windhoek
  » More info & related results
2013 Report1.94 mb pdf
Preview
Berger, J. 1997. Population Constraints Associated with the Use of Black Rhinos as an Umbrella Species for Desert Herbivores. Conservation Biology, 11(1): 69–78
  » More info & related results
1997 Journal Article
Dean, K. 2012. Caught on tape: camera trapping in Etosha National Park, Namibia. Giraffa, 6(1): 15
  » More info & related results
2012 Journal Article284 kb pdf
Preview
Knott, K. 2010. Report on Commiphora and other high value plant research and monitoring in Kunene
  » More info & related results
2010 Report203 kb pdf
Preview
Tordiffe, E.A.W. 2010. Groundwater monitoring in the Orange-Fish River Basin, Namibia: Recommendations towards establishing a monitoring system. Report produced by GeoHydro Consultants Namibia and Karst Hydrogeological Consultants Namibia for the Ephemeral River Basins in Southern Africa (ERB) Project, Desert Research Foundation of Namibia (DRFN): Windhoek
  » More info & related results
2010 Report10.97 mb pdf
Preview
Tordiffe, E.A.W. 2010. Groundwater monitoring in the Orange-Fish River Basin, Namibia: Recommendations towards establishing a monitoring system. Appendix 1: Chemical analyses of groundwater samples from NamWater production schemes. Report produced by GeoHydro Consultants Namibia and Karst Hydrogeological Consultants Namibia for the Ephemeral River Basins in Southern Africa (ERB) Project, Desert Research Foundation of Namibia (DRFN): Windhoek
  » More info & related results
2010 Appendix2.57 mb pdf
Preview
Stander, P.E. 1991. Demography of lions in the Etosha National Park. Madoqua, 18(1): 1-9
  » More info & related results
1991 Journal Article892 kb pdf
Preview
Wolter, K. 2011. Cape vulture Task Force report. Vulture Programme (VulPro)
  » More info & related results
2011 Report541 kb doc
Berry, H.H. 1981. Population structure, mortality patterns and a predictive model for estimating future trends in wildebeest numbers in the Etosha National Park. Madoqua, 12(4): 225-266
  » More info & related results
1981 Journal Article805 kb pdf
Preview
Stander, P. and Hanssen, L. 2003. Population ecology of desert-adapted lions in the Kunene Region, Namibia
  » More info & related results
2003 Report1.34 mb pdf
Preview
Bonyongo, M.C. and Ogutu, J. 2007. Trends in large herbivore populations in the Okavango Delta, a dynamic protected wetland ecosystem. Harry Oppenheimer Okavango Research Centre, University of Botswana. SCB Symposium, Port Elizabeth, 1-5 July 2007
  » More info & related results
2007 Report16.24 mb pdf
Preview
Saetersdal, G., Bianchi, G., Strømme, T. and Venema, S.C. 1999. The Dr. Fridtjof Nansen Programme 1975–1993 - Investigations of fishery resources in developing regions History of the programme and review of results. FAO Fisheries Technical Paper 391
  » More info & related results
1999 Report4.71 mb pdf
Preview
13th Namibian rangeland forum - The role of biodiversity in rangeland management and policy. Neudamm Faculty of Agriculture and Natural Resources, Windhoek, 27-29 October 2009. Proceedings(Programme and Abstracts)
  » More info & related results
2009 Report8.42 mb pdf
Preview
Kiekebusch, E. 2009. A Review of land degradation assessment and monitoring methods. 13th Namibian Rangeland Forum - The role of biodiversity in rangeland management and policy, Neudamm Faculty of Agriculture and Natural Resources, Windhoek, Dates: 27-29 October 2009
  » More info & related results
2009 Presentation548 kb pdf
Preview
Terrell, K.A., Crosier, A.E., Wildt, D.E., O'Brien, S.J., Anthony, N.M., Marker, L. and Johnson, W.E. 2016. Continued decline in genetic diversity among wild cheetahs (Acinonyx jubatus) without further loss of semen quality. Biological Conservation, 200: 192–199
  » More info & related results
2016 Journal Article
Stein, A.B., Fuller, T.K. and Marker, L.L. 2008. Opportunistic use of camera traps to assess habitat-specifc mammal and bird diversity in northcentral Namibia. Biodiversity Conservation, 17: 3579–3587
  » More info & related results
2008 Journal Article198 kb pdf
Preview
Stein, A.B., Erckie, B., Fuller, T.K. and Marker, L.L. 2010. Camera trapping as a method for monitoring rhino populations within the Waterberg Plateau Park, Namibia. Pachyderm, 48: 67-70
  » More info & related results
2010 Journal Article641 kb pdf
Preview
Hancock, P. 2016. Why did the Lappet-faced Vulture fly to the other side of the country? BirdLife Botswana. Symposium on animal movements & satellite tracking in Namibia, November 2016
  » More info & related results
2016Symposium on animal movements & satellite tracking in Namibia, November 2016Presentation4.12 mb ppt
Preview
Brown, C. 2016. Thoughts, ideas and actions. Namibian Chamber of Environment (NCE). Symposium on animal movements & satellite tracking in Namibia, November 2016
  » More info & related results
2016Symposium on animal movements & satellite tracking in Namibia, November 2016Presentation589 kb pdf
Preview
Hanssen, L. 2016. Home ranges and transboundary movement of Spotted hyaenas in the Zambezi region from satellite tracking and camera traps. Kwando Carnivore Project. Symposium on animal movements & satellite tracking in Namibia, November 2016
  » More info & related results
2016Symposium on animal movements & satellite tracking in Namibia, November 2016Presentation28.27 mb pptx
Versfeld, W.F., Leslie, A.J., van Asch, B., Mathews, I., Beytell, P.C., Du Preez, P., Rhode, C. and Slabbert, R. 2016. Track the split of crocodile sub populations. University of Stellenbosch. Symposium on animal movements & satellite tracking in Namibia, November 2016
  » More info & related results
2016Symposium on animal movements & satellite tracking in Namibia, November 2016Presentation19.39 mb pptx
Scott, A., Scott, M., Böhme, H., Boorman, M., Brain, C., Guim, S., Kolberg, H., Mendelsohn, J., Shatumbu, G., Versfeld, W. and Vilho, A. 2016. Tracking flagship wetland bird species in Namibia. Namibia Crane Working Group and NamPower/NNF Strategic Partnership. Symposium on animal movements & satellite tracking in Namibia, November 2016
  » More info & related results
2016Symposium on animal movements & satellite tracking in Namibia, November 2016Presentation4.45 mb pdf
Preview
van Vuuren, R. 2016. Tracking to change. Naankuse. Symposium on animal movements & satellite tracking in Namibia, November 2016
  » More info & related results
2016Symposium on animal movements & satellite tracking in Namibia, November 2016Presentation15.27 mb pptx
Uiseb, K. 2016. Welcoming remarks. Symposium on animal movements & satellite tracking in Namibia, November 2016
  » More info & related results
2016Symposium on animal movements & satellite tracking in Namibia, November 2016Report15 kb docx
Naidoo, R., Du Preez, P., Stuart-Hill, G., Weaver, L.C., Jago, M. and Wegmann, W. 2012. Factors affecting intraspecific variation in home range size of a large African herbivore. Landscape Ecology, 27(10): 1523-1534
  » More info & related results
2012 Journal Article
Marsh, A.C. 1984. The efficacy of pitfall traps for determining the structure of a desert ant community. Journal of the Entomological Society of Southern Africa, 47(1): 115-120
  » More info & related results
1984 Journal Article364 kb pdf
Preview
Elwen, S., Meyer, M.A., Best, P.B., Kotze, P.G.H., Thornton, M. and Swanson, S. 2006. Range and Movements of Female Heaviside's Dolphins (Cephalorhynchus heavisidii), as Determined by Satellite-Linked Telemetry. Journal of Mammalogy, 87(5): 866–877
  » More info & related results
2006 Journal Article488 kb pdf
Preview
Stratford, K.J., Weise, F.J., Meltzheimer, J. and De Woronin-Britz, N. 2016. Observations of servals in the highlands of central Namibia. CAT News, 64: 14-17
  » More info & related results
2016 Journal Article1.2 mb pdf
Preview
Stander, P. 2009. Movement patterns and activity of desert-adapted lions in Namibia: GPS radio collars. Desert Lion Conservation Research Report – 2009
  » More info & related results
2009 Report606 kb pdf
Preview
Stander, P. 2006. Population ecology and demography of Kunene Lions - January 2006. Research Paper: 2006/1
  » More info & related results
2006 Report2.92 mb pdf
Preview
Stander, P. and Hanssen, L. 2003. Population ecology of desert-adapted lions in the Kunene Region, Namibia. Research Report, October 2003
  » More info & related results
2003 Report1.34 mb pdf
Preview
Stander, P.E. and Gasaway, W.C. 1991. Spotted hyaenas immobilized with Ketamine/Xylazine and antagonized with Tolazoline. African Journal of Ecolology, 29: 168-169
  » More info & related results
1991 Journal Article104 kb pdf
Preview
Edwards, S., Gange, A. and Wiesel, I. 2015. Spatio-temporal resource partitioning of water sources by African carnivores on Namibian commercial farmlands. Journal of Zoology, 297(1): 22–31
  » More info & related results
2015 Journal Article
Morsbach, D. 1986. The cheetah in S.W.A/Namibia (A short summary and preliminary report)
  » More info & related results
1986 Report251 kb pdf
Preview
Versfeld, W., Lyet, A., Slabbert, R., Leslie, A., Beytell, P. and du Preez, P. Nile crocodile (Crocodylus niloticus) genetic diversity and population structure in the Kunene and Kavango River systems in Northern Namibia
  » More info & related results
 Presentation3.4 mb pdf
Preview
Gaidet-Drapier, N., Fritz, H., Bourgarel, M., Renaud, P-C., Poilecot, P., Chardonnet, P., Coid, C., Poulet, D. and Le Bel, S. 2006. Cost and efficiency of large mammal census techniques: Comparison of methods for a participatory approach in a communal area, Zimbabwe. Biodiversity and Conservation, 15(2): 735–754
  » More info & related results
2006 Journal Article235 kb pdf
Preview
Kolberg, H. and Bridgeford, P. 2018. The long and the short of it: Some statistics from the 2012 Lappet-faced Vulture chick ringing in the Namib. Vulture News, 65: 45-47
  » More info & related results
2018 Journal Article306 kb pdf
Preview
Martin, M.J., Elwen, S.H., Kassanjee, R. and Gridley, T. 2019. To buzz or burst-pulse? The functional role of Heaviside's dolphin, Cephalorhynchus heavisidii, rapidly pulsed signals. Animal Behaviour, In press
  » More info & related results
2019 Thesis

» Links to useful free software for working with shapefiles, kml and kmz files, pdf files and more.