Hydrobiological Studies on Alkaline and Acid Still Waters in the Western Cape Province

Harrison, A. D.

doi:10.1080/00359196209519050

Cited by 37 publications

(11 citation statements)

References 14 publications

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“…Aquatic invertebrates from the same area were similarly distributed (Harrison, 1962). The mechanisms underlying such distributions may initially be based on differential survival of larvae, later reinforced by fidelity of resultant breeding adults (Karns, 1984).…”

Section: Water Chemistry-analyses Of the Tap And Blackwaters Presumementioning

confidence: 98%

Embryonic Tolerance of Xenopus (Anura) to Acidic Blackwater

Picker¹,

McKenzie²,

Fielding³

1993

Copeia

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Section: Water Chemistry-analyses Of the Tap And Blackwaters Presumementioning

confidence: 98%

Embryonic Tolerance of Xenopus (Anura) to Acidic Blackwater

Picker¹,

McKenzie²,

Fielding³

1993

Copeia

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“…Western leopard toads presently occur within Sand Fynbos, which is acidic, while the geographic gap corresponds with Strandveld Fynbos which is alkaline (Harrison 1962). During a drying climate, pH of water in potential breeding sites would become more strongly influenced by the substrate.…”

Section: Causes Of Disjunct Distributionmentioning

confidence: 99%

Investigating the cause of the disjunct distribution of Amietophrynus pantherinus, the Endangered South African western leopard toad

Measey

Tolley

2009

Conserv Genet

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More amphibians are threatened through loss of habitat than any other single factor. Conservation measures to restore habitat are dependent on historical data indicating the original extent of a species. When historical data is absent, disjunct distributions create a special problem for conservationists who need to determine whether they have an anthropogenic cause. The Endangered western leopard toad (Amietophrynus pantherinus) has a disjunct distribution in the south-western tip of South Africa. We use mitochondrial sequences from 153 individuals to show that the disjunct distribution is unlikely to have an anthropogenic origin. Two distinct populations are separated by 100 km, with highest probability for the most recent common ancestor arising some 5 Kya. The causes of this disjunct distribution appear to be too recent to be attributable to changes in sea level; instead we suggest that there was a range retraction associated with a distinct drying period in the area during the Holocene, possibly indicating that this species will be susceptible to future climate change. Further, we find that the eastern population is less genetically diverse and appears to be undergoing a serious reduction in range, despite its occurrence in the least urbanized habitat. Conservation measures suggested include surveys for breeding sites in the eastern population, custodian agreements for existing breeding sites and foraging areas and the need for a Biodiversity Management Plan to be drawn up and implemented.

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“…Our associated material was collected at the type-locality from bottom mud in acid, brown water dystrophic lakes and ponds at a depth of about 1.5 m; they were not collected in the marginal reeds. The small lake at Betty's Bay is described by Harrison (1958).…”

Section: Remarksmentioning

confidence: 99%

Acinoretracus, A New Afrotropical Genus for Some Species Previously Placed in Dicrotendipes (Diptera: Chironomidae: Chironominae)

Epler¹,

Harrison²,

Hare³

1998

Tijdschr Entomol

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Compared to the western Palaearctic and most of the Nearctic, the taxonomy of the midge family Chironomidae from the Afrotropical region is poorly known. Generic relationships of many species are uncertain because their immature stages, often necessary for delimiting genera, are unknown, in spite of their ecological importance in African fresh waters. Here we report on reared material of several problematic species that require establishment of a new genus. Goetghebuer (1936) placed a newly described Afrotropical species, Chironomus regalis, in the subgenus Carteria Kieffer, 1921. Carteria had been shown earlier (Strand 1928) to be preoccupied by Carteria Diesing, 1866; Strand (1928) offered Carteronica as a replacement name; Tendipes longilobus (Kieffer, 1916) was retained as the type-species. Freeman (1957) considered Carteronica to be a synonym of Chironomus (Dicrotendipes). Later workers, such as Hamilton et al. (1969), re-elevated Dicrotendipes Kieffer, 1913, to generic status. Epler (1987:19, 1988:9, 32) noted that four Afrotropical species placed in Dicrotendipes by Freeman & Cranston (1980) could not be maintained in that genus. Epler (1988) also stated that Carteronica was not a synonym of Dicrotendipes, and that Carteronica longilobus did not belong with those Afrotropical species previously considered to belong to Carteronica. Cranston et al. (1990) showed that C. longilobus was best placed in Kiefferulus Goetghebuer, 1922; Carteronica became a junior synonym of Kiefferulus. Based on the morphology of the adult genitalia and the immature stages, the Afrotropical species 'Dicrotendipes' multispinosus (Freeman, 1957) and 'D.' penicillatus (Freeman, 1957) require establishment of a new genus. Similarities in the adult genitalia, and to a 209

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Hydrobiological Studies on Alkaline and Acid Still Waters in the Western Cape Province

Cited by 37 publications

References 14 publications

Embryonic Tolerance of Xenopus (Anura) to Acidic Blackwater

Embryonic Tolerance of Xenopus (Anura) to Acidic Blackwater

Investigating the cause of the disjunct distribution of Amietophrynus pantherinus, the Endangered South African western leopard toad

Acinoretracus, A New Afrotropical Genus for Some Species Previously Placed in Dicrotendipes (Diptera: Chironomidae: Chironominae)

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