The distribution of euphorbia candelabrum in the Southern Rift Valley, Kenya

Holland, Peter; Hove, A. R. T.

doi:10.1007/bf02387877

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…Water availability may be a more direct influence on the woodland structure, and will depend on slope, substrate, and runoff characteristics. It appears unlikely that the cacti themselves are much affected by water limitations, unlike species in the Sonoran Desert (with 4-5 times less precipitation), and unlike the arborescent stemsucculent Euphorbia candelabra in the rift valley of Kenya, whose habitat range decreases with decreasing precipitation and water availability (Holland & Hove, 1975). Further, there is no evidence in the Chamela species that smaller individuals are interspecifically more different in branching morphology than are larger individuals (see Fig.…”

Section: Discussionmentioning

confidence: 79%

Distribution and morphology of columnar cacti in tropical deciduous woodland, Jalisco, Mexico

Cody

1986

Vegetatio

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The distribution and branching morphologies of four species of columnar cactus species in tropical deciduous woodland in Jalisco, western Mexico, are examined. Two species, Stenocereus marginatus and especially Pachycereuspecten-aboriginum, are taller and extend through the woodland canopy, and only these two species occupy habitats where the woodland vegetation is taller, on N-and NE-facing aspects where incident radiation levels are lowest. Two species, Stenocereus standleyi and Cephalocereus purpusii, are shorter, subcanopy species, and are more restricted to low-angle slopes and slopes with S-to W-aspects, where the woodland vegetation is shorter and more open, with a greater penetration of radiation into the vegetation. Branching morphology is affected by the vegetation cover in all species, but in different ways between the two taller and the two shorter species. Ecological segregation in these four species is achieved apparently by differences among the light regimes of subhabitats correlated to the morphology of the cacti. This contrasts to segregation in Sonoran Desert columnar cactus species, which segregate by different strategies of water uptake and utilization, and in columnar cacti in woodlands in Oaxaca further south in Mexico, where adult individuals are very similar in branching morphology, but the younger individuals differ in this respect and presumably become established in different sorts of light gaps.

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Section: Discussionmentioning

confidence: 79%

Distribution and morphology of columnar cacti in tropical deciduous woodland, Jalisco, Mexico

Cody

1986

Vegetatio

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“…By turns erudite and arcane, thorough and cursory, profound and superficial, edifying and obscure (though the first part of each of these binary characterisation is always more appropriate than the second), it offers a deep well of hard‐won historical information without quite answering – or perhaps even fully appreciating – the significant questions to which this information speaks. Written by Peter Holland, a well‐regarded biogeographer whose career has been devoted to investigating the landscape ‘as a dynamic stage that offers diverse ecological and evolutionary opportunities for living things’ (Distinguished New Zealand Geographer citation, ), Home in the Howling Wilderness is one of the latest markers of a remarkable intellectual journey that has carried Holland's interests from studies of the distribution of euphorbia and the demography of the trout lily (Holland and Hove, ; Holland, ) to a fascination with the ecological transformations produced by, and the environmental learning of, early colonial New Zealanders (Holland, 2000; Pawson and Holland, ). Tracing this arc, one might easily be tempted to cannibalise Izaak Walton () and describe Peter Holland as The Compleat Geographer .…”

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confidence: 99%