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You searched for: Journal African zoology Remove constraint Journal: African zoology Publication Year 2015 Remove constraint Publication Year: 2015 Source 2015 v.50 no.4 Remove constraint Source: 2015 v.50 no.4
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1. Concurrent Pregnancy and Lactation in Wild Giraffes (Giraffa camelopardalis)

Author:
Deacon, Francois; Nel, Pierre J; Bercovitch, Fred B
Source:
African zoology 2015 v.50 no.4 pp. 331-334
ISSN:
1562-7020
Subject:
Giraffa camelopardalis; breeding; calves; conception; cows; embryogenesis; lactation; ovulation; pregnancy
Abstract:
... Lactation boosts reproductive costs by depleting maternal condition and delaying subsequent conception. However, some evidence suggests that giraffes (Giraffa camelopardalis) have evolved a mechanism to minimise the time allocated to suckling-induced suppression of ovulation. Here, we show for the first time that wild giraffe cows are impregnated while nursing a young calf. We suggest that a trio ...
DOI:
10.1080/15627020.2015.1120643

2. Digestive Efficiency of Indigenous and Invasive Avian Species Fed Fruit of Invasive Alien Plants in South Africa

Author:
Thabethe, Vuyisile; Wilson, Amy-Leigh; Hart, Lorinda A; Downs, Colleen T
Source:
African zoology 2015 v.50 no.4 pp. 293-297
ISSN:
1562-7020
Subject:
Cinnamomum camphora; Morus alba; Psidium guajava; Psittacula; Solanum mauritianum; Tauraco; diet; energy; energy requirements; frugivores; fruits; indigenous species; introduced plants; invasive species; parakeets; South Africa
Abstract:
... Many highly invasive plant species produce fleshy fruit that are consumed and dispersed by frugivorous birds. However, little is known about assimilation efficiency of invasive fruit by indigenous and invasive avian species. We investigated whether indigenous Knysna (Tauraco corythaix) and Purple-crested (Gallirex porphyreolophus) Turacos and invasive alien Rose-ringed Parakeets (Psittacula kramer ...
DOI:
10.1080/15627020.2015.1106924

3. Digestive Parameters and Energy Assimilation of Cape Porcupine on Economically Important Crops

Author:
Pillay, Kerushka R; Wilson, Amy-Leigh; Ramesh, Tharmalingam; Downs, Colleen T
Source:
African zoology 2015 v.50 no.4 pp. 321-326
ISSN:
1562-7020
Subject:
food intake; energy intake; human-wildlife relations; sweet potatoes; agricultural land; experimental diets; farmers; Solanum tuberosum; Ipomoea batatas; potatoes; Juglans cinerea; water content; economic impact
Abstract:
... To better understand how Cape porcupines are able to successfully occupy many agricultural lands, we studied their digestive parameters and energy assimilation when fed three economically important agricultural crops (potatoes [Solanum tuberosum], sweet potatoes [Ipomoea batatas] and butternut [Juglans cinerea]). Daily food intake, daily gross energy intake, daily faecal energy loss, daily energy ...
DOI:
10.1080/15627020.2015.1116373

4. Effects of a Fast-Burning Spring Fire on the Ground-Dwelling Spider Assemblages (Arachnida: Araneae) in a Central South African Grassland Habitat

Author:
Haddad, Charles R; Foord, Stefan H; Fourie, René; Dippenaar-Schoeman, Anna S
Source:
African zoology 2015 v.50 no.4 pp. 281-292
ISSN:
1562-7020
Subject:
Amaurobiidae; Gnaphosidae; Lycosidae; burning; fires; grasslands; grazing; habitats; herbivores; hot springs; invertebrates; pitfall traps; spring; vegetation structure; South Africa
Abstract:
... Fire is widely used as a management strategy in grasslands to maintain vegetation structure and improve grazing quality for large herbivores. The impacts of burning on invertebrates in South Africa remain poorly understood. A study was initiated in spring 2005 to determine the impact of a fast hot burn on ground-dwelling spider assemblages in a grassland habitat in the central Free State. Pitfall ...
DOI:
10.1080/15627020.2015.1088400

5. Evolutionary Retention of Defensive Lateral Pedal Glands in the Smallest Siphonariid Limpet (Gastropoda: Pulmonata)

Author:
Pinchuck, Shirley C; Allanson, Brian R; Hodgson, Alan N
Source:
African zoology 2015 v.50 no.4 pp. 327-330
ISSN:
1562-7020
Subject:
Gastropoda; habitats; limpets; transmission electron microscopy
Abstract:
... Despite its cryptic habitat and habits, light and transmission electron microscopy has revealed that like many other siphonariids Siphonaria compressa, the smallest species of this genus, possesses lateral pedal glands. The pear-shaped glands (about 120 µm long × 70 µm maximum diameter) open via a pore, and are multicellular with three types of secretory cell that surround a central lumen. The gla ...
DOI:
10.1080/15627020.2015.1106925

6. Movement Behaviour of Alien Largemouth Bass Micropterus salmoides in the Estuarine Headwater Region of the Kowie River, South Africa

Author:
Murray, Taryn S; Magoro, Mandla L; Whitfield, Alan K; Cowley, Paul D
Source:
African zoology 2015 v.50 no.4 pp. 263-271
ISSN:
1562-7020
Subject:
Micropterus salmoides; acoustics; adults; autumn; estuaries; freshwater; habitats; juveniles; marine fish; migratory behavior; piscivores; rivers; summer; telemetry; water temperature; winter; South Africa
Abstract:
... The movement behaviour of largemouth bass Micropterus salmoides in the estuarine headwater region of the Kowie River, South Africa, was investigated using passive acoustic telemetry. Ten adult fish were tagged and released in four discrete pools below a weir that precluded possible upriver migration. Their residency and movement patterns were monitored using 27 moored acoustic receivers spanning b ...
DOI:
10.1080/15627020.2015.1079141

7. Nesting Ecology of Ferruginous Duck Aythya nyroca in North-Eastern Algeria

Author:
Fouzari, Aicha; Samraoui, Farrah; Alfarhan, Ahmed H; Samraoui, Boudjéma
Source:
African zoology 2015 v.50 no.4 pp. 299-305
ISSN:
1562-7020
Subject:
Alnus glutinosa; Aythya; attitudes and opinions; breeding; brood parasitism; clutch size; conservation areas; ducks; eggs; habitats; hatching; lakes; monitoring; nesting; nests; oviposition; population dynamics; predation; reproductive success; threatened species; vegetation cover; water birds; Algeria
Abstract:
... The status of waterbirds breeding in protected areas in North Africa needs constant monitoring because of a naturally fluctuating environment and permissive attitudes towards illegal activities likely to negatively affect population dynamics of threatened species. We present the results of a study conducted at a protected site, Lake Tonga, north-eastern Algeria, on a breeding population of Ferrugi ...
DOI:
10.1080/15627020.2015.1108165

8. The Role of Waterbirds in the Dispersal of Freshwater Cladocera and Bryozoa in Southern Africa

Author:
Reynolds, Chevonne; Cumming, Graeme S
Source:
African zoology 2015 v.50 no.4 pp. 307-311
ISSN:
1562-7020
Subject:
Bryozoa; Cladocera; aquatic invertebrates; diapause; digestive system; eggs; feathers; feces; freshwater; water birds; wetlands; South Africa
Abstract:
... It has long been presumed that waterbirds disperse the propagules of aquatic organisms. However, it is only in recent years that this claim has been empirically explored and little is still known about waterbird-mediated dispersal in southern Africa. Aquatic invertebrates are thought to be well adapted to dispersal by waterbirds because of their ability to produce hardy resting eggs. We explored t ...
DOI:
10.1080/15627020.2015.1108164

9. Trophic Relationships of Hake (Merluccius capensis and M. paradoxus) and Sharks (Centrophorus squamosus, Deania calcea and D. profundorum) in the Northern (Namibia) Benguela Current region

Author:
Iitembu, Johannes A; Richoux, Nicole B
Source:
African zoology 2015 v.50 no.4 pp. 273-279
ISSN:
1562-7020
Subject:
Centrophorus; Deania; Merluccius capensis; carbon; carbon sinks; diet; hake; muscle tissues; niches; nitrogen; sharks; stable isotopes; trophic relationships; Namibia
Abstract:
... The trophic relationships of two hake species (Merluccius capensis and M. paradoxus) and three shark species (Centrophorus squamosus, Deania calcea and D. profundorum) were investigated using nitrogen and carbon stable isotope signatures (δ¹⁵N and δ¹³C) of their muscle tissues. The sharks were more enriched in ¹⁵N than the hake, an indication of the apex predator status of sharks. Among the sharks ...
DOI:
10.1080/15627020.2015.1079142