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Parallel Evolution Controlled by Adaptation and Covariation in Ammonoid Cephalopods Claude Monnet, Kenneth De Baets, Christian Klug

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Parallel Evolution Controlled by Adaptation and Covariation in Ammonoid Cephalopods Claude Monnet, Kenneth De Baets, Christian Klug Parallel evolution controlled by adaptation and covariation in ammonoid cephalopods Claude Monnet, Kenneth de Baets, Christian Klug To cite this version: Claude Monnet, Kenneth de Baets, Christian Klug. Parallel evolution controlled by adaptation and covariation in ammonoid cephalopods. BMC Evolutionary Biology, BioMed Central, 2011, 11 (115), 10.1186/1471-2148-11-115. hal-03034590 HAL Id: hal-03034590 https://hal.archives-ouvertes.fr/hal-03034590 Submitted on 22 Dec 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Monnet et al. BMC Evolutionary Biology 2011, 11:115 http://www.biomedcentral.com/1471-2148/11/115 RESEARCHARTICLE Open Access Parallel evolution controlled by adaptation and covariation in ammonoid cephalopods Claude Monnet*, Kenneth De Baets and Christian Klug Abstract Background: A major goal in evolutionary biology is to understand the processes that shape the evolutionary trajectory of clades. The repeated and similar large-scale morphological evolutionary trends of distinct lineages suggest that adaptation by means of natural selection (functional constraints) is the major cause of parallel evolution, a very common phenomenon in extinct and extant lineages. However, parallel evolution can result from other processes, which are usually ignored or difficult to identify, such as developmental constraints. Hence, understanding the underlying processes of parallel evolution still requires further research. Results: Herein, we present a possible case of parallel evolution between two ammonoid lineages (Auguritidae and Pinacitidae) of Early-Middle Devonian age (405-395 Ma), which are extinct cephalopods with an external, chambered shell. In time and through phylogenetic order of appearance, both lineages display a morphological shift toward more involute coiling (i.e. more tightly coiled whorls), larger adult body size, more complex suture line (the folded walls separating the gas-filled buoyancy-chambers), and the development of an umbilical lid (a very peculiar extension of the lateral shell wall covering the umbilicus) in the most derived taxa. Increased involution toward shells with closed umbilicus has been demonstrated to reflect improved hydrodynamic properties of the shell and thus likely results from similar natural selection pressures. The peculiar umbilical lid might have also added to the improvement of the hydrodynamic properties of the shell. Finally, increasing complexity of suture lines likely results from covariation induced by trends of increasing adult size and whorl overlap given the morphogenetic properties of the suture. Conclusions: The morphological evolution of these two Devonian ammonoid lineages follows a near parallel evolutionary path for some important shell characters during several million years and through their phylogeny. Evolution of some traits (involution, umbilical lid) appears to be mainly driven by adaptation to improve the hydrodynamic properties of the shell, whereas other characters (sutural complexity) evolved due to covariation with features that play a central role in the morphogenesis of mollusc shells. This example provides evidence that parallel evolution can be driven simultaneously by different factors such as covariation (constructional constraints) and adaptation (natural selection). Background [20-22], therefore illustrating natural selection’s major role Independent evolution of similar biological traits in two in shaping morphological evolution and the repeatability different lineages branching off from the same ancestor of evolutionary processes. Several additional processes defines parallel evolution [1-3]. It is a common phenom- have been proposed that could contribute to the fabric of enon described for many animal clades (see e.g., [4-13]), parallel evolution. However, the contribution and condi- including molluscs [1,14-19]. Repeated patterns of parallel tions in which these various processes trigger parallel mor- evolutionary change of phenotypic traits are commonly phological evolution are still insufficiently investigated. regarded as evidence of adaptation under common selec- Furthermore, understanding the processes involved in tion pressures such as common environmental factors parallel evolution is also important for solving systematic problems and thus to estimate evolutionary rates and * Correspondence: [email protected] diversity [14]. Paläontologisches Institut und Museum, Universität Zürich, Karl Schmid Strasse 4, 8006 Zürich, Switzerland © 2011 Monnet et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited Monnet et al. BMC Evolutionary Biology 2011, 11:115 Page 2 of 21 http://www.biomedcentral.com/1471-2148/11/115 Evolutionary steps in two independent lineages will very early in the history and rapid diversification of the never be absolutely identical [1,15,16,23,24]. Neverthe- Ammonoidea during the Early and Middle Devonian in less, morphological (phenotypic) evolutionary trends do the time interval between about 405 and 395 Ma [64]. occur in independent lineages and can display striking The ammonoid shell, which grew by accretion, consists parallel changes (for a Recent mollusc example, see of a roughly conic, chambered, calcified, often ornamen- [17]). Here, the term parallel evolution is used in a ted and (more or less regularly) coiled conch. Yet, during broad sense, implying that not all parts of the organism this early diversification phase, the history of ammonoids undergo parallel evolutionary transformations and that is characterized by a morphological macroevolutionary the trends are nearly parallel, resulting in very similar trend from straight-shelled ancestors (bactritoids; for a organs/structures in a phylogenetic series of more than review of cephalopod phylogeny, see [65]) via loosely one species in at least two lineages. coiled earliest ammonoids toward completely tightly Parallel evolution is often difficult to differentiate from coiled forms with closed umbilicus (Figure 1; [58,66-70]). convergence (evolution from two different stages of This major evolutionary trend is thought to have separate lineages toward an evolutionary stage that has occurred in a time interval of only about 2 My (see evolved striking similarities among some phenetic, [58,69]). This rather fast evolution is evidenced by the genetic or other traits; [25]) and some authors have co-occurrence of loosely coiled primitive forms, which even suggested a continuum between convergent and are associated with contemporaneous, more derived, parallel evolution [2,26]. The distinction between con- coiled forms in several localities that yielded the earliest vergent, parallel, and divergent evolution indeed requires ammonoids [71-78]. Furthermore, this morphological the historical evolutionary aspect of studied lineages. evolutionary trend occurred during the most intense Because it is the only direct evidence of evolution in the phase of the “Devonian nekton revolution” [79]. This past over long time spans, palaeontological data can macroecological event corresponds to an explosive trend provide important insights into patterns and processes from planktonic and demersal marine animals toward of parallel evolution. true nekton as represented by the great diversification of In the fossil record, the Ammonoidea (Cephalopoda, jawed fish and ammonoids, reflecting a selection for Mollusca) are well-known to display large-scale morpholo- swimming capabilities. It coincided with macroevolution- gical macroevolutionary trends [27-39]. These marine ary transformations among various mollusc groups: an extinct cephalopods with an external, chambered shell increasing proportion of gastropods formed tightly coiled have repeatedly been proven to be valuable study objects protoconchs [80]; some dacryoconarids [81,82], ammo- todeveloportestevolutionary hypotheses [27,29, noids [58] and some nautiloids [83,84] more or less 34-36,40-50]. Besides, ammonoids “are for palaeontologists simultaneously evolved coiled shells, mainly during what Drosophila is in genetics” [51]. Their usefulness in the Early Devonian. Among ammonoids, these post- evolutionary biology originates in their high evolutionary embryonic morphological transformations enhanced rates, high taxonomic diversity and morphological dispar- buoyancy and swimming capabilities [58,85]. ity, and usually well-known stratigraphic (i.e. temporal) The case of parallel evolution studied here includes two framework (see [52-54]). However, such morphological families of ammonoids, namely the Auguritidae and Pina- evolutionary trends among ammonoids have been rarely citidae (Figure 2A). These two ammonoid lineages are of discussed and quantified in detail [38,39,47,55-58]. Knowl- Emsian and Eifelian age (~ 405-395 Ma; [86]) and have a edge of details in such lineages with seemingly
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