Patterns of Tree Species Richness Along Peninsular Extensions of Tropical Forests

Tackaberry, Rosanne; Kellman, Martin

doi:10.2307/2997445

Cited by 9 publications

(3 citation statements)

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“…Contrary to the predictions of island biogeography, Tackaberry and Kellman (1996) found no significant relationship between the distance from the main tract of rain forest and the plot diversity of tree species in rain-forest`peninsular' protruding from the main tracts. They concluded that their finding demonstrates the importance of rain-forest corridors in conserving tropical rain-forest biodiversity.…”

Section: Biogeographycontrasting

confidence: 99%

Tropical rain forests

Bowman

1998

Progress in Physical Geography: Earth and Environment

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Section: Biogeographycontrasting

confidence: 99%

Tropical rain forests

Bowman

1998

Progress in Physical Geography: Earth and Environment

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“…Similar idiosyncratic results have also been found in habitat peninsulas. For example, Tackaberry and Kellman [16] reported no peninsula effect in tropical forest trees, while Tubelis et al . [12] found a marked peninsula effect in eucalypt forest birds.…”

Section: Introductionmentioning

confidence: 99%

Pattern or process? Evaluating the peninsula effect as a determinant of species richness in coastal dune forests

2017

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The peninsula effect predicts that the number of species should decline from the base of a peninsula to the tip. However, evidence for the peninsula effect is ambiguous, as different analytical methods, study taxa, and variations in local habitat or regional climatic conditions influence conclusions on its presence. We address this uncertainty by using two analytical methods to investigate the peninsula effect in three taxa that occupy different trophic levels: trees, millipedes, and birds. We surveyed 81 tree quadrants, 102 millipede transects, and 152 bird points within 150 km of coastal dune forest that resemble a habitat peninsula along the northeast coast of South Africa. We then used spatial (trend surface analyses) and non-spatial regressions (generalized linear mixed models) to test for the presence of the peninsula effect in each of the three taxa. We also used linear mixed models to test if climate (temperature and precipitation) and/or local habitat conditions (water availability associated with topography and landscape structural variables) could explain gradients in species richness. Non-spatial models suggest that the peninsula effect was present in all three taxa. However, spatial models indicated that only bird species richness declined from the peninsula base to the peninsula tip. Millipede species richness increased near the centre of the peninsula, while tree species richness increased near the tip. Local habitat conditions explained species richness patterns of birds and trees, but not of millipedes, regardless of model type. Our study highlights the idiosyncrasies associated with the peninsula effect—conclusions on the presence of the peninsula effect depend on the analytical methods used and the taxon studied. The peninsula effect might therefore be better suited to describe a species richness pattern where the number of species decline from a broader habitat base to a narrow tip, rather than a process that drives species richness.

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“…Support for the geometry hypothesis includes studies of birds in Baja California, in Florida, and in Yucatan (Mexico) [16], amphibians and reptiles in the Florida peninsula [7], six vertebrate groups (lizards, snakes, birds, mammals in general, and heteromyid rodents and bats) in the Baja California peninsula [17], forest vegetation in the state of Maine [18], and passerine birds in Spain [19]. At the same time, mixed patterns have been observed in peninsulas: hump-shaped species richness of ground beetles in the mid-range of the Florida peninsula [20] and no pattern related to scorpions along the axis of the Baja California peninsula [21] or in the tropical forests of Belize and Venezuela [22]. A noteworthy summary was a meta-analysis by Jenkins et al [23], in which only 18 out of 37 studies (49%) exhibited the peninsula effect, and the geometry hypothesis is considered as an idiosyncratic phenomenon that depends on context, taxonomic group, and analytic scales [12,23].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Peninsula Effect Using the Latitudinal Abundance Pattern for Tree Species in Florida

Kwon

Lin

2019

Diversity

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The peninsula effect is a biological diversity pattern found in peninsulas in which the number of species decreases toward the tip of the peninsula. The geometry hypothesis, as one proposed cause of the peninsula effect, attempts to predict this pattern by examining the peculiarities of peninsular geometry. As peninsulas are characterized by their isolated positions, it has been suggested that a decreased immigration-to-extinction rate is the cause of the decrease in species diversity from the base to the tip of a peninsula. We aimed to test the geometry hypothesis on tree species in the Florida peninsula by modeling the latitudinal abundance pattern using sample-based tree inventory data. We postulated that the current abundance distribution of a species is a ramification of past immigration–extinction dynamics in a peninsula, as well as an important indicator of such dynamics in the future. The latitudinal abundance patterns of 113 tree species in Florida in the southeastern United States were simulated with the Huisman–Olff–Fresco (HOF) model using the USDA Forest Service’s Forest Inventory and Analysis (FIA) database. Evidence species for the geometry hypothesis were then selected if the simulated latitudinal abundance pattern was asymmetric with its abundance maxima occurring within the Florida peninsula (i.e., approximately 31.5° latitude or lower). Our HOF model results found that most species (87% of 113 species) did not experience any steep abundance decline along the Florida peninsula when compared with their general trend across the range, suggesting that the observed diversity pattern of tree species in Florida could merely be a continuation of latitudinal diversity gradients in the southeastern United States, independent of peninsular geometry.

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Patterns of Tree Species Richness Along Peninsular Extensions of Tropical Forests

Cited by 9 publications

References 0 publications

Tropical rain forests

Tropical rain forests

Pattern or process? Evaluating the peninsula effect as a determinant of species richness in coastal dune forests

Investigation of the Peninsula Effect Using the Latitudinal Abundance Pattern for Tree Species in Florida

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