Seasonal variation of two phenolic amines inAcacia berlandieri

Forbes, T. D. A.; Pemberton, I. J.; Smith, Gerald R.; Hensarling, C.M.

doi:10.1006/jare.1995.0035

Cited by 28 publications

(17 citation statements)

References 17 publications

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“…We did not attempt to assess potential nutritional variability among silver wattle trees. Although such diVerences probably exist (e.g., Forbes et al 1995;Rohner and Ward 1997), they are unlikely to alter the broad patterns we observed given the large diVerence in availability of silver wattle between the two sites.…”

Section: Discussioncontrasting

confidence: 47%

Resource distribution influences mating system in the bobuck (Trichosurus cunninghami: Marsupialia)

Martin

2007

Oecologia

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Mammalian mating systems are thought to be shaped by the spatial distribution and abundance of key resources, which in turn influence the spacing behaviour of individuals. In particular, female home range size is predicted to reflect the availability of key resources. We documented the availability and distribution of food and shelter resources for two neighbouring populations of bobucks, or mountain brushtail possums, Trichosurus cunninghami, that were characterised by different mating systems: our "forest population" was socially monogamous, whereas the "roadside population" was polygynous. Both silver wattle, Acacia dealbata, the main food resource for bobucks, and den-trees, which provided shelter, occurred at significantly higher density at the roadside site. The pattern of distribution of these two resources also differed between the sites. Both food and den-trees were scattered evenly throughout the roadside habitat. In contrast, den-trees were located predominantly at one end of the forest site, while silver wattle trees were located at the other. There was no significant difference in the amount of silver wattle, or in the number of den-trees, located within the home ranges of individual females at the two sites. However, forest females had home ranges, on average, almost three times the size of those of roadside females. At the roadside site, the size of female home ranges varied inversely with the density of silver wattle, indicating that these females ranged over as large an area as necessary to gain access to sufficient silver wattle trees. There was no such relationship among forest females. These populations provide a clear example of resource distribution determining female home range size. This influenced the number of female home ranges a male's home range overlapped with, which in turn determined the mating system. Such clear links between resource availability and mating system have not previously been established in a marsupial.

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Section: Discussioncontrasting

confidence: 47%

Resource distribution influences mating system in the bobuck (Trichosurus cunninghami: Marsupialia)

Martin

2007

Oecologia

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“…In some plants, the concentration of secondary compounds in young leaves is lower than in mature leaves (e.g. Langenheim 1994;Forbes et al 1995;Lerdau et al 1995;Llusià & Peñuelas 2000). It may be that a similar process takes place in the roots of the species studied here.…”

Section: Discussionmentioning

confidence: 66%

“…In some plants, the concentration of secondary compounds in young leaves is lower than in mature leaves (e.g. Langenheim 1994; Forbes et al . 1995 ; Lerdau et al .…”

Section: Discussionmentioning

confidence: 99%

A universal molecular method for identifying underground plant parts to species

2000

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As part of a large project to determine rooting depth and resource uptake on the Edwards Plateau of central Texas, we developed a DNA-based technique that allows the below-ground parts of all plants to be identified to the level of genus and usually to species. Identification is achieved by comparing DNA sequences of the internal transcribed spacer (ITS) region of the 18S-26S nuclear ribosomal DNA repeat, derived from below-ground plant material, with a reference ITS region database for plants at a site. The method works throughout plants because the plant ITS region can be PCR amplified using a set of universal primers. Congeneric species can usually be identified because the ITS region evolves relatively rapidly. In our study, all roots were easily identified to the level of genus; most congeneric species were identified solely by ITS sequence differences but some required a combination of ITS sequence data and above-ground surveys of species at a site. In addition to showing the feasibility and efficacy of our technique, we compare it with another DNA-based technique used to identify below-ground plant parts. Finally, we also describe a DNA extraction and purification technique that reliably provides high-quality DNA of sufficient quantity from roots so that PCR can be readily accomplished. Our technique should allow the below-ground parts of plants in any system to be identified and thereby open new possibilities for the study of below-ground plant communities.

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“…Some of these metabolites may be toxic and reduce development and growth (Bernays, Cooper-Driver & Bilgener, 1989;Bernays, 199 1 ;Feeny, 1992;Bennett & Wallsgrove, 1994;Hartley &Jones, 1997). Others may be used as a defence against herbivory (Forbes et al, 1995). Speiser & Rowell-Rahier (1993) suggested that secondary metabolites may be important by causing snails to eat sequentially mixed diets.…”

Section: Introductionmentioning

confidence: 98%

Peripheral defence strategy: variation of barbaloin content in the succulent leaf parts of Aloe arborescens Miller (Liliaceae)

Gutterman

Chauser-Volfson²

2000

Botanical Journal of the Linnean Society

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A h a r b m c m is a large, multi-stemmed shrub and is one of the very common Aloe species along the Indian Ocean coast of southern Africa, from the Cape, in the south, to Zimbabwe and Malawi in the north. It is used as a hedge plant to protect agricultural fields or stock and as a horticultural plant in gardens. Barbaloin, a secondary phenolic metabolite, is distributed in the plants as part of a peripheral defence strategy. Barbaloin content was found to be highest in the youngest leaves. Within these, concentration varied at its highest in the terminal third of the leaf, at its lowest in the basal third; higher in the terminal, adaxial, leaf margin and lower in the basal, abaxial, leaf centre. The more times a leaf is cut, the higher the barbaloin content of the new growth from the leaf base that remains on the plant. This may deter animals such as elephants and kudu from eating the new growths. They may prefer to eat other plants that have not been damaged by consumption for longer periods. This phenomenon may give damaged plants the chance to renew themselves before their leaves are consumed again.

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Seasonal variation of two phenolic amines inAcacia berlandieri

Cited by 28 publications

References 17 publications

Resource distribution influences mating system in the bobuck (Trichosurus cunninghami: Marsupialia)

Resource distribution influences mating system in the bobuck (Trichosurus cunninghami: Marsupialia)

A universal molecular method for identifying underground plant parts to species

Peripheral defence strategy: variation of barbaloin content in the succulent leaf parts of Aloe arborescens Miller (Liliaceae)

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