Zobrazeno 1 - 10
of 73
pro vyhledávání: '"Helen F. Dallas"'
Publikováno v:
Journal of Limnology, Vol 82, Iss s1 (2023)
Freshwater fishes are recognised as South Africa’s most threatened species group. Reliable, long-term data on fish occurrence records are critical for effectively managing and conserving these species. A comprehensive freshwater fish dataset was co
Externí odkaz:
https://doaj.org/article/a0e30290a58041f79584e691ee07dafe
Autor:
Mohammed Kajee, Dominic A. W. Henry, Helen F. Dallas, Charles L. Griffiths, Josephine Pegg, Dewidine Van der Colff, Dean Impson, Albert Chakona, Domitilla C. Raimondo, Nancy M. Job, Bruce R. Paxton, Martine S. Jordaan, Roger Bills, Francois Roux, Tsungai A. Zengeya, Andre Hoffman, Nick Rivers-Moore, Jeremy M. Shelton
Publikováno v:
Frontiers in Environmental Science, Vol 11 (2023)
In South Africa, anthropogenic pressures such as water over-abstraction, invasive species impacts, land-use change, pollution, and climate change have caused widespread deterioration of the health of river ecosystems. This comes at great cost to both
Externí odkaz:
https://doaj.org/article/56caae2277eb440a8d0b1b02771d7ade
Autor:
Mohammed Kajee, Helen F. Dallas, Charles L. Griffiths, Cornelius J. Kleynhans, Jeremy M. Shelton
Publikováno v:
Fishes, Vol 8, Iss 12, p 571 (2023)
In South Africa, freshwater habitats are among the most threatened ecosystems, and freshwater fishes are the most threatened species group. Understanding patterns in freshwater fish diversity, threat, invasion, and protection status are vital for the
Externí odkaz:
https://doaj.org/article/34006987b1fa4a9bb469b99812de202d
Autor:
Helen F. Dallas
Publikováno v:
Frontiers in Water, Vol 3 (2021)
Benthic macroinvertebrates are commonly used to assess water quality and ecological condition of aquatic ecosystems and they form the basis of several biotic indices. Many of these biotic indices are based on rapid bioassessment protocols (RBP). The
Externí odkaz:
https://doaj.org/article/6f922eab89a54acfb5900d42f0a7e082
Autor:
Oghenekaro N Odume, Frank C Akamagwuna, Pindiwe Ntloko, Helen F Dallas, Chika F Nnadozie, Helen M Barber-James
Publikováno v:
African Journal of Aquatic Science; Vol. 48 No. 1 (2023); 64-70
Invertebrates are often used as indicators of ecosystem health. In community ecology, the use of organism traits (e.g. behavioural, biological or ecological) can be of value in relation to impact diagnosis and assemblage prediction. It has also been
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f93eef372fd2c9ef4e93eb7f1f22f17
https://www.ajol.info/index.php/ajas/article/view/246390
https://www.ajol.info/index.php/ajas/article/view/246390
Publikováno v:
African Journal of Aquatic Science; Vol. 47 No. 3 (2022); 291-306
Access to long-term biodiversity datasets is vital for monitoring, managing and protecting freshwater ecosystems. Detecting critical ecosystem changes, such as losing unique biodiversity and ecosystem services, is dependent on access to data. A wealt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::83892b230d930b3f2d41db3f5448b4ad
https://doi.org/10.2989/16085914.2021.1982672
https://doi.org/10.2989/16085914.2021.1982672
Autor:
Helen F. Dallas, B. Mosepele
Publikováno v:
African Journal of Aquatic Science. 45:350-363
Spatial variability in macroinvertebrate assemblages of the Okavango Delta, Botswana, was examined to evaluate differences in assemblages at a regional and habitat scale. Sampling was undertaken si...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d1ffd64ab52c25598727a85b9d808c1
https://doi.org/10.2989/16085914.2019.1704215
https://doi.org/10.2989/16085914.2019.1704215
Publikováno v:
Journal of thermal biology. 97
Compared to other climate regions of the world, Mediterranean regions are likely to experience more severe effects of climate change as rainfall decreases and temperatures increase. Global climate change models predict a reduction in rainfall and ris
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bfcc54e8d91219cb3a624ed2132b0a41
https://pubmed.ncbi.nlm.nih.gov/33863447
https://pubmed.ncbi.nlm.nih.gov/33863447
Publikováno v:
African Journal of Aquatic Science. 43:325-344
An extensive survey of tropical rivers, conducted during 2009–2012 throughout Zambia, collected 151 samples of benthic macroinvertebrates, located on 95 rivers in six of the nine freshwater ecoregi...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f290f27eb9c0c87a0b29355ea75ea64e
https://doi.org/10.2989/16085914.2018.1517081
https://doi.org/10.2989/16085914.2018.1517081
Publikováno v:
Aquatic Ecology. 52:333-349
Understanding the response of aquatic organisms to elevated water temperatures offers insight into the ecological consequences of climate change on riverine species. Upper thermal limits were determined for two riverine invertebrates, the amphipod Pa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74187e130ea5de13f5aa5e60da6344a9
https://doi.org/10.1007/s10452-018-9667-2
https://doi.org/10.1007/s10452-018-9667-2