Role of the embryo in crab terrestrialisation: an ontogenetic approach

Cannicci, Stefano; Simoni, Riccardo; Giomi, Folco

doi:10.3354/meps08954

Cited by 16 publications

(10 citation statements)

References 48 publications

(42 reference statements)

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“…It is interesting to underline that reproductive output, expressed as amount of eggs produced per female per spawning event, is strongly and positively correlated to adult dimensions (R 2 = 0.89, p = 0.001; Linear regression test) confirming that as big a crab species is as it produces more eggs [ 96 ]. Permutational multiple regression models showed that the estimated number of eggs m -2 at each spawning event was negatively correlated with the haplotype diversity, while the species average density and Tajima’s D parameter were positively correlated to haplotype diversity.…”

Section: Resultsmentioning

confidence: 99%

Demographic History and Reproductive Output Correlates with Intraspecific Genetic Variation in Seven Species of Indo-Pacific Mangrove Crabs

2016

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The spatial distribution and the amount of intraspecific genetic variation of marine organisms are strongly influenced by many biotic and abiotic factors. Comparing biological and genetic data characterizing species living in the same habitat can help to elucidate the processes driving these variation patterns. Here, we present a comparative multispecies population genetic study on seven mangrove crabs co-occurring in the West Indian Ocean characterized by planktotrophic larvae with similar pelagic larval duration. Our main aim was to investigate whether a suite of biological, behavioural and ecological traits could affect genetic diversities of the study species in combination with historical demographic parameters. As possible current explanatory factors, we used the intertidal micro-habitat colonised by adult populations, various parameters of individual and population fecundity, and the timing of larval release. As the genetic marker, we used partial sequences of cytochrome oxidase subunit I gene. Genetic and ecological data were collected by the authors and/or gathered from primary literature. Permutational multiple regression models and ANOVA tests showed that species density and their reproductive output in combination with historical demographic parameters could explain the intraspecific genetic variation indexes across the seven species. In particular, species producing consistently less eggs per spawning event showed higher values of haplotype diversity. Moreover, Tajima’s D parameters well explained the recorded values for haplotype diversity and average γst. We concluded that current intraspecific gene diversities in crabs inhabiting mangrove forests were affected by population fecundity as well as past demographic history. The results were also discussed in terms of management and conservation of fauna in the Western Indian Ocean mangroves.

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Section: Resultsmentioning

confidence: 99%

Demographic History and Reproductive Output Correlates with Intraspecific Genetic Variation in Seven Species of Indo-Pacific Mangrove Crabs

2016

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“…In the context of terrestrialization of crabs, the presence of multiple taxa which independently underwent, and still undergo, the evolutionary leap from sea to land ( Figure 1 ) represents an ideal experimental dataset for cross-sectional studies that aim to compare microbiome composition both among different terrestrial taxa and between them and closely related marine species. Since terrestrialization lead to several, but similar, physiological adaptations ( Little, 2009 ; Cannicci et al, 2011 ; Giomi et al, 2014 ), terrestrial crabs represent a suitable model for testing the relationships between microbiome composition and their functions, in order to interpret the ecosystem services provided by the crab-associated microbiome with respect to the new physiological challenges. In terms of organs, the hepatopancreas, where nutrients are stored ( Zimmer, 2002 ), the multifunctional gills, responsible for ion, gas, and nitrogen exchanges ( Morris, 2001 ) and the intestine, which has to cope with non-digestible compounds ( Linton and Greenaway, 2007 ) should be targeted in future research aimed to ascertain the development of host-microbe interactions in these model systems.…”

Section: Discussionmentioning

confidence: 99%

“…The differences between aquatic and terrestrial habitats are enormous and nearly every aspect of a crab life needs to cope with such a transition ( Little, 2009 ). During this process, remarkable morphological and physiological changes were required to tackle challenges relevant to locomotion ( Burggren and McMahon, 1988 ), gaseous exchange ( Farrelly and Greenaway, 1993 , 1994 ; Paoli et al, 2015 ), excretion ( Wood and Boutilier, 1985 ; Greenaway, 1988 ), reproduction ( Cannicci et al, 2011 ; Simoni et al, 2013 ), foraging ( Lindquist et al, 2009 ), and salt availability ( Anger, 1995 ; Faria et al, 2017 ), given the huge difference in physical properties of air and water ( Little, 1990 ; Figure 2 ).…”

Section: To the Land And Beyond: A True Crab Endeavormentioning

confidence: 99%

“…Intertidal brachyuran crabs belonging to unrelated taxa share very similar sensory, respiratory, excretory, and osmoregulatory adaptations to the terrestrial environment ( Burggren and McMahon, 1988 ), indicating convergent evolutionary trends ( Little, 2009 ; Cannicci et al, 2011 ; Giomi et al, 2014 ). Microbes are known to be strongly involved in various physiological processes of animals, such as herbivory (see for instance Hansen and Moran, 2014 ) and ammonia detoxification ( van Kessel et al, 2016 ).…”

Section: To the Land And Beyond: A True Crab Endeavormentioning

confidence: 99%

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To the Land and Beyond: Crab Microbiomes as a Paradigm for the Evolution of Terrestrialization

et al. 2020

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The transition to terrestrial environments by formerly aquatic species has occurred repeatedly in many animal phyla and lead to the vast diversity of extant terrestrial species. The differences between aquatic and terrestrial habitats are enormous and involved remarkable morphological and physiological changes. Convergent evolution of various traits is evident among phylogenetically distant taxa, but almost no information is available about the role of symbiotic microbiota in such transition. Here, we suggest that intertidal and terrestrial brachyuran crabs are a perfect model to study the evolutionary pathways and the ecological role of animal-microbiome symbioses, since their transition to land is happening right now, through a number of independent lineages. The microorganisms colonizing the gut of intertidal and terrestrial crabs are expected to play a major role to conquer the land, by reducing water losses and permitting the utilization of novel food sources. Indeed, it has been shown that the microbiomes hosted in the digestive system of terrestrial isopods has been critical to digest plant items, but nothing is known about the microbiomes present in the gut of truly terrestrial crabs. Other important physiological regulations that could be facilitated by microbiomes are nitrogen excretion and osmoregulation in the new environment. We also advocate for advances in comparative and functional genomics to uncover physiological aspects of these ongoing evolutionary processes. We think that the multidisciplinary study of microorganisms associated with terrestrial crabs will shed a completely new light on the biological and physiological processes involved in the sea-land transition.

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“…Little is known about the ontogenetic adaptations of embryos of semiterrestrial and terrestrial crabs; the scarce studies focus principally on egg size and egg clutch volume to prevent low oxygen tension (Strathmann & Hess, 1999), embryo air breath (Cannicci et al, 2011), and biomass and energy content (Urzúa et al, 2018).…”

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confidence: 99%

How does emersion time affect embryos of coastal marine invertebrate species? Biochemical responses of three porcelain crabs from the Southeastern Pacific

2021

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Decapods are among the most diverse taxonomic groups of Crustacea (Thiel & Watling, 2015). Most decapods inhabit subtidal ecosystems where environmental variables, such as temperature, oxygen availability, pH, and salinity, fluctuate less than in intertidal areas, allowing the predominance of aerobic species (Atkinson & Taylor, 2005;Munari, 2008;Whiteley & Taylor, 2015). Evolutionary studies have shown that biotic interactions (i.e., predation and competition) and key environmental parameters (such as temperature, salinity, pH, and food availability) have allowed crustaceans to progressively adapt to and colonize a wide range of environments, in addition to

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Role of the embryo in crab terrestrialisation: an ontogenetic approach

Cited by 16 publications

References 48 publications

Demographic History and Reproductive Output Correlates with Intraspecific Genetic Variation in Seven Species of Indo-Pacific Mangrove Crabs

Demographic History and Reproductive Output Correlates with Intraspecific Genetic Variation in Seven Species of Indo-Pacific Mangrove Crabs

To the Land and Beyond: Crab Microbiomes as a Paradigm for the Evolution of Terrestrialization

How does emersion time affect embryos of coastal marine invertebrate species? Biochemical responses of three porcelain crabs from the Southeastern Pacific

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