Between‐taxon matching of common and rare species richness patterns

Abstract

Aim Our primary aim is to understand how assemblages of rare (restricted range) and common (widespread) species are correlated with each other among different taxa. We tested the proposition that marine species richness patterns of rare and common species differ, both within a taxon in their contribution to the richness pattern of the full assemblage and among taxa in the strength of their correlations with each other. Location The UK intertidal zone. Methods We used high‐resolution marine datasets for UK intertidal macroalgae, molluscs and crustaceans each with more than 400 species. We estimated the relative contribution of rare and common species, treating rarity and commonness as a continuous spectrum, to spatial patterns in richness using spatial cross‐correlations. Correlation strength and significance was estimated both within and between taxa. Results Common species drove richness patterns within taxa, but rare species contributed more when species were placed on an equal footing via scaling by binomial variance. Between taxa, relatively small sub‐assemblages (fewer than 60 species) of common species produced the maximum correlation with each other, regardless of taxon pairing. Cross‐correlations between rare species were generally weak, with maximum correlation occurring between small sub‐assemblages in only one case. Cross‐correlations between common and rare species of different taxa were consistently weak or absent. Main conclusions Common species in the three marine assemblages were congruent in their richness patterns, but rare species were generally not. The contrast between the stronger correlations among common species and the weak or absent correlations among rare species indicates a decoupling of the processes driving common and rare species richness patterns. The internal structure of richness patterns of these marine taxa is similar to that observed for terrestrial taxa.

Cross-taxon congruence in the rarity of subtidal rocky marine assemblages: No taxonomic shortcut for conservation monitoring

“…On the one 373 hand, the same incongruence was reported for marine biota similar to the ones we studied 374 (Hirst, 2008), as well as related marine biota such as intertidal zones in the United Kingdom 375 (Reddin et al, 2015) or structurally less similar biota such as coral reefs (Jimenez et al, 2012) 376 and tropical seabeds (Sutcliffe et al, 2012). On the other hand, studies on a similar set of phyla 377…”

Ant assemblages have darker and larger members in cold environments

“…Cerdá et al ., ), which has tended to focus on the importance of biotic factors such as competition (but see Gibb, ). The importance of the common species in driving these macrophysiological patterns echoes similar findings in macroecology where it is also the common species which drive assemblage diversity patterns (Reddin et al ., ).…”

The global biogeography of lizard functional groups

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