The effect of small-scale topography on patterns of endemism within islands

Cutts, Vanessa; Katal, Negin; Löwer, Caroline; Algar, Adam C.; Steinbauer, Manuel J.; Irl, Severin D. H.; Beierkuhnlein, Carl; Field, Richard

doi:10.21425/f5fbg43737

Cited by 3 publications

(4 citation statements)

References 33 publications

(47 reference statements)

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“…Cliffs in the Mediterranean are considered refugia for plant species with unique species composition [58]. Vertical cliffs and rocky habitats in a landscape contribute to the isolation of open habitats and increase fragmentation among patches, but also consist of habitat islands, often isolated, which are themselves separated from each other by dispersal barriers, creating divergence between resident populations [59] and having the potential to harbor relatively high levels of endemism [60].…”

Section: Chasmophytic Flora Of the Aegean Species Richness Life Forms And Chorologymentioning

confidence: 99%

“…Kallimanis et al [76] found that neo-endemics, as a proportion of the islands' flora, is associated only with the islands' maximum elevation and that neoendemic species richness is also strongly correlated to island area and diversity of geological substrate, indicating that an island's habitat heterogeneity is the main environmental driver of speciation. The effect of large-scale topography such as mountain ranges on patterns of species richness, speciation rates, and endemism are increasingly well documented [39,42,57,[77][78][79][80], but the direct effect of local topography such as ravines is less well understood [60], although areas with larger variation in elevation are thought to have higher speciation and endemism rates [81].…”

Section: Elevational Gradients and Spatial Turnover Of Chasmophytic Diversity: Monitoring Insightsmentioning

confidence: 99%

“…Habitat diversity, of which elevation is another dimension, is the main factor affecting plant species diversity (including single island endemics) on East Aegean islands, except the Aegean endemics that are better predicted by elevation [84]. On a global scale, archipelago endemics have been shown to increase with elevation [39], but looking more closely at small-scale topographic variation may reveal more intricate patterns of endemism [60]. Drivers affecting plant diversity patterns along elevational gradients on the continental island of Crete seem to be combined, each one with different intensity and duration of influence, depending largely on historical parameters [37].…”

Section: Elevational Gradients and Spatial Turnover Of Chasmophytic Diversity: Monitoring Insightsmentioning

confidence: 99%

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Habitat Islands on the Aegean Islands (Greece): Elevational Gradient of Chasmophytic Diversity, Endemism, Phytogeographical Patterns and need for Monitoring and Conservation

Kontopanou¹,

Panitsa²

2020

Diversity

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The Aegean archipelago, characterized as a natural laboratory for research concerning plant species diversity and phytogeography has a complex geological and paleogeographical history that varies among its phytogeographical areas. A different combination of factors of variable intensity and duration time drives patterns of its impressive plant species richness and endemism. Cliffs, a conspicuous feature of the Aegean landscape, consist of biologically closed communities that serve as refugia for obligate chasmophytes, the majority of which are Greek or Aegean endemics, and for this reason, they are also considered as habitat islands on the Aegean islands. A synoptic analysis is presented concerning chasmophytic plant diversity focusing on endemic obligate chasmophytes. Phytogeographical patterns of obligate chasmophytes, and especially the endemic ones as well as their elevational range and distribution and zeta diversity, are analyzed and discussed in the frame of climatic change, mentioning that the most threatened endemic obligate chasmophytes are those specialized in high elevation areas, and focusing on the need for monitoring and conservation.

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Section: Chasmophytic Flora Of the Aegean Species Richness Life Forms And Chorologymentioning

confidence: 99%

Section: Elevational Gradients and Spatial Turnover Of Chasmophytic Diversity: Monitoring Insightsmentioning

confidence: 99%

Section: Elevational Gradients and Spatial Turnover Of Chasmophytic Diversity: Monitoring Insightsmentioning

confidence: 99%

See 1 more Smart Citation

Habitat Islands on the Aegean Islands (Greece): Elevational Gradient of Chasmophytic Diversity, Endemism, Phytogeographical Patterns and need for Monitoring and Conservation

Kontopanou¹,

Panitsa²

2020

Diversity

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“…For instance, on oceanic islands, such as the Galápagos islands, habitat filtering proved to be more important than dispersal limitation in determining the species composition of plant assemblages (Carvajal-Endara et al, 2017). Thus, habitats within each island can differ in species composition (e.g., Cutts et al, 2019) and have also been referred to as "habitat islands" (Kontopanou and Panitsa, 2020). Since the species-area relationship predicts that larger habitats support higher species richness, the species richness of each habitat within an island is controlled by the area, by a Habitat Species-Area Relationship (HSAR).…”

Section: Introductionmentioning

confidence: 99%

Habitat type and island identity as drivers of community assembly in an archipelago

Chiarucci

Buldrini

Cervellini

et al. 2020

J Vegetation Science

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Aim: Ecoinformatics offer new opportunity to test islands as biogeographic and ecological models. In this paper we predicted three hypotheses: (1) plot-based data issuing from vegetation surveys can be used to predict Island Species-Area Relationships (ISARs) or island similarity; (2) the habitat area is an independent predictor of species richness patterns within island; (3) species richness and composition are more dependent on habitat type than island identity in land-bridge islands. Area: Tuscan Archipelago, Italy. Methods: We assembled a database of all the vegetation plots available for the archipelago. For the first hypothesis we calculated ISARs, using Arrhenius model, and Beta Diversity, using Jaccard dissimilarity, on both published floras and cumulative plot data. For the second hypothesis, we modelled Habitat Species-Area Relationships (HSARs), using Arrhenius model. For the third hypothesis, we used additive partitioning of species richness, NMDS and PERMANOVA. Results: Island Species-Area Relationships based on plot data mirrored those on published floras, but absolute values of c and z parameters were different. Beta diversity based on plot data resembled those of published floras, but was higher. Species richness was significantly related to the habitat area. The total species richness of the archipelago was linked to large scale drivers, such as island identity, while plot species composition was driven by both habitat type and island identity. Conclusions: Data assembled issuing from vegetation surveys are useful to describe biogeographic patterns. Species richness in the archipelago is driven by spatial factors such as the amount of habitats and the differences among islands, while the species composition of local assemblages is largely driven by habitat filters rather than by island identity, as expected in land-bridge islands.

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The Importance of Including Spatial Autocorrelation When Modelling Species Richness in Archipelagos: A Bayesian Approach

et al. 2023

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One of the aims of island biogeography theory is to explain the number of species in an archipelago. Traditionally, the variables used to explain the species richness on an island are its area and distance to the mainland. However, increasing evidence suggests that accounting for other variables is essential for better estimates. In particular, the distance between islands should play a role in determining species richness. This work uses a Bayesian framework using Gaussian processes to assess whether distance to neighbouring islands (spatial autocorrelation) can better explain arthropod species richness patterns in the Azores Archipelago and in the Canary Islands. This method is flexible and allows the inclusion of other variables, such as maximum altitude above sea level (elevation). The results show that accounting for spatial autocorrelation provides the best results for both archipelagos, but overall, spatial autocorrelation seems to be more important in the Canary archipelago. Similarly, elevation plays a more important role in determining species richness in the Canary Islands. We recommend that spatial autocorrelation should always be considered when modelling an archipelago’s species richness.

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The effect of small-scale topography on patterns of endemism within islands

Cited by 3 publications

References 33 publications

Habitat Islands on the Aegean Islands (Greece): Elevational Gradient of Chasmophytic Diversity, Endemism, Phytogeographical Patterns and need for Monitoring and Conservation

Habitat Islands on the Aegean Islands (Greece): Elevational Gradient of Chasmophytic Diversity, Endemism, Phytogeographical Patterns and need for Monitoring and Conservation

Habitat type and island identity as drivers of community assembly in an archipelago

The Importance of Including Spatial Autocorrelation When Modelling Species Richness in Archipelagos: A Bayesian Approach

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