Comparative mitochondrial genomics of sponge-dwelling snapping shrimps in the genus Synalpheus: Exploring differences between eusocial and non-eusocial species and insights into phylogenetic relationships in caridean shrimps

Gene ◽  
2021 ◽  
Vol 786 ◽  
pp. 145624
Author(s):  
Caroline C. Ennis ◽  
Nariah N. Haeffner ◽  
Cameron D. Keyser ◽  
Shannon T. Leonard ◽  
Austin C. Macdonald-Shedd ◽  
...  
Keyword(s):  
Phylogenetic Relationships ◽  
Mitochondrial Genomics ◽  
Snapping Shrimps ◽  
Eusocial Species

scholarly journals Demographic inference provides insights into the extirpation and ecological dominance of eusocial snapping shrimps

2020 ◽  
Author(s):  
Solomon T. C. Chak ◽  
Stephen E. Harris ◽  
Kristin M. Hultgren ◽  
J. Emmett Duffy ◽  
Dustin R. Rubenstein
Keyword(s):  
Life Histories ◽  
Environmental Changes ◽  
Population Declines ◽  
Effective Population ◽  
Social Traits ◽  
Population Sizes ◽  
Demographic Inference ◽  
Ecological Dominance ◽  
Snapping Shrimps ◽  
Eusocial Species

AbstractEusocial animals often achieve ecological dominance in the ecosystems where they occur, a process that may be linked to their demography. That is, reproductive division of labor and high reproductive skew in eusocial species is predicted to result in more stable effective population sizes that may make groups more competitive, but also lower effective population sizes that may make groups more susceptible to inbreeding and extinction. We examined the relationship between demography and social organization in one of the few animal lineages where eusociality has evolved recently and repeatedly among close relatives, the Synalpheus snapping shrimps. Although eusocial species often dominate the reefs where they occur by outcompeting their non-eusocial relatives for access to sponge hosts, many eusocial species have recently become extirpated across the Caribbean. Coalescent-based historical demographic inference in 12 species found that across nearly 100,000 generations, eusocial species tended to have lower but more stable effective population sizes through time. Our results are consistent with the idea that stable population sizes may enable eusocial shrimps to be more competitively dominant, but they also suggest that recent population declines are likely caused by eusocial shrimps’ heightened sensitivity to anthropogenically-driven environmental changes as a result of their low effective population sizes and localized dispersal, rather than to natural cycles of inbreeding and extinction. Thus, although the unique life histories and demography of eusocial shrimps has likely contributed to their persistence and ecological dominance over evolutionary timescales, these social traits may also make them vulnerable to contemporary environmental change.

scholarly journals Eusociality in snapping shrimps is associated with larger genomes and an accumulation of transposable elements

2021 ◽  
Vol 118 (24) ◽  
pp. e2025051118
Author(s):  
Solomon T. C. Chak ◽  
Stephen E. Harris ◽  
Kristin M. Hultgren ◽  
Nicholas W. Jeffery ◽  
Dustin R. Rubenstein
Keyword(s):  
Transposable Elements ◽  
Genome Size ◽  
Social Evolution ◽  
Repetitive Elements ◽  
Genome Architecture ◽  
Ancestral State ◽  
Effective Population ◽  
Snapping Shrimps ◽  
The Relationship ◽  
Eusocial Species

Despite progress uncovering the genomic underpinnings of sociality, much less is known about how social living affects the genome. In different insect lineages, for example, eusocial species show both positive and negative associations between genome size and structure, highlighting the dynamic nature of the genome. Here, we explore the relationship between sociality and genome architecture in Synalpheus snapping shrimps that exhibit multiple origins of eusociality and extreme interspecific variation in genome size. Our goal is to determine whether eusociality leads to an accumulation of repetitive elements and an increase in genome size, presumably due to reduced effective population sizes resulting from a reproductive division of labor, or whether an initial accumulation of repetitive elements leads to larger genomes and independently promotes the evolution of eusociality through adaptive evolution. Using phylogenetically informed analyses, we find that eusocial species have larger genomes with more transposable elements (TEs) and microsatellite repeats than noneusocial species. Interestingly, different TE subclasses contribute to the accumulation in different species. Phylogenetic path analysis testing alternative causal relationships between sociality and genome architecture is most consistent with the hypothesis that TEs modulate the relationship between sociality and genome architecture. Although eusociality appears to influence TE accumulation, ancestral state reconstruction suggests moderate TE abundances in ancestral species could have fueled the initial transitions to eusociality. Ultimately, we highlight a complex and dynamic relationship between genome and social evolution, demonstrating that sociality can influence the evolution of the genome, likely through changes in demography related to patterns of reproductive skew.

Sponge-dwelling snapping shrimps (Alpheidae: Synalpheus) of Barbados, West Indies, with a description of a new eusocial species

Zootaxa ◽  
2011 ◽  
Vol 2834 (1) ◽  
pp. 1 ◽  
Author(s):  
KRISTIN M. HULTGREN ◽  
KENNETH S MACDONALD III ◽  
J. EMMETT DUFFY
Keyword(s):  
New Species ◽  
West Indies ◽  
Species Complex ◽  
Caribbean Sea ◽  
The West ◽  
The Caribbean ◽  
Snapping Shrimps ◽  
First Time ◽  
One New Species ◽  
Eusocial Species

Sampling of eight sites along the west coast of Barbados, West Indies, yielded 14 species of sponge-dwelling shrimps in the gambarelloides group of the genus Synalpheus, including one new species described here as Synalpheus microneptunus n. sp. The new species is a member of the S. paraneptunus Coutière species complex and is distinguished from other species in that group by the combination of four carpal segments in the second pereopod, uropodal exopod with 2 nd distolateral tooth smaller than the other two teeth and set in line with movable spine, and a small blade on the scaphocerite. Synalpheus microneptunus n. sp. is the smallest species in the complex (2.2-2.9 mm CL) and lives in small colonies, usually with fewer than 10 individuals, often with a single breeding female. Synalpheus thele Macdonald, Hultgren & Duffy is reported for the first time from outside its type locality in Jamaica. Sampling in Barbados produced fewer species than did similar efforts in Jamaica and Curaçao, possibly due to the relatively isolated position of the island at the eastern (windward) edge of the Caribbean Sea.

Architecture of Radiolitid Rudist (Mollusca) Shell-Wall Structures and its Phylogenetic Implications

1975 ◽  
Vol 33 ◽  
pp. 686-687
Author(s):  
David H. Sturm ◽  
Bob F. Perkins
Keyword(s):  
Phylogenetic Relationships ◽  
Outer Wall ◽  
Shell Microstructure ◽  
Shell Wall ◽  
Wall Structures ◽  
Phylogenetic Implications ◽  
Cellular Wall ◽  
Superfamily Analysis ◽  
Central Texas

Each of the seven families of rudists (Mollusca, Bivalvia, Hippuritacea) is characterized by distinctive shell-wall architectures which reflect phylogenetic relationships within the superfamily. Analysis of the complex, calcareous, cellular wall of the attached valve of the radiolite rudist Eoradiolites davidsoni (Hill) from the Comanche Cretaceous of Central Texas indicates that its wall architecture is an elaboration of the simpler monopleurid rudist wall and supports possible radiolite-monopleurid relationships.Several well-preserved specimens of E. davidsoni were sectioned, polished, etched, and carbon and gold coated for SEM examination. Maximum shell microstructure detail was displayed by etching with a 0.7% HC1 solution from 80 to 100 seconds.The shell of E. davidsoni comprises a large, thick-walled, conical, attached valve (AV) and a small, very thin, operculate, free valve (FV) (Fig. 1a). The AV shell is two-layered with a thin inner wall, in which original structures are usually obliterated by recrystallization, and a thick, cellular, outer wall.

Phylogenetic relationships ofSalvia(Lamiaceae) in China: Evidence from DNA sequence datasets

2012 ◽  
pp. n/a-n/a
Author(s):  
Qian-Quan Li ◽  
Min-Hui Li ◽  
Qing-Jun Yuan ◽  
Zhan-Hu Cui ◽  
Lu-Qi Huang ◽  
...  
Keyword(s):  
Dna Sequence ◽  
Phylogenetic Relationships

Systematics of Hymenophyllum subgenus Mecodium (Hymenophyllaceae) in Taiwan

2019 ◽  
Vol 44 (4) ◽  
pp. 753-767
Author(s):  
Tian-Chuan Hsu ◽  
Yu-Fang Huang ◽  
Yi-Shan Chao
Keyword(s):  
Phylogenetic Relationships ◽  
The Philippines ◽  
Common Element ◽  
Morphological Investigation ◽  
Eastern Asia ◽  
Type Specimens ◽  
The Status ◽  
Molecular Phylogenetic ◽  
A New Species ◽  
Independent Species

Abstract—Hymenophyllum subg. Mecodium, composed of the taxonomically notorious H. polyanthos and approximately 15 other closely related taxa, is a common element of filmy fern communities in the tropical and subtropical moist forests. In Taiwan, although only H. polyanthos and one or two closely related taxa were recognized in recent studies, considerable morphological variation has been observed among populations throughout the island. Thus, we conducted an extensive morphological investigation, as well as a molecular phylogenetic analysis, to clarify the specific diversity and phylogenetic relationships within Hymenophyllum subg. Mecodium in Taiwan. Field and herbaria surveys helped in recognizing five morphs in Taiwan, mainly differentiated by the combination of certain traits, viz., the presence or absence of stipe wings, general frond size and shape, degree of laminar crispation, sori position, and involucre shape. The different morphs had diverse ecological preferences. The phylogenetic tree, inferred from the sequences of the plastid loci rbcL and rps4-trnS, demonstrated that Hymenophyllum subg. Mecodium materials in Taiwan comprise several well-supported lineages, mostly corresponding to the classification based on morphology. Comparing with the protologues and type specimens of 34 related scientific names, the five morphs are herein recognized as five independent species. A new species, Hymenophyllum exquisitum, is described here. Also, the status of H. paniculiflorum is reconfirmed and that of H. fujisanense, H. parallelocarpum, and H. punctisorum reinstated. Only H. exquisitum and H. parallelocarpum are endemic to Taiwan among all the species studied. In addition, the names Hymenophyllum blumeanum, H. integrum, H. microsorum, H. polyanthos, H. tenellum, and H. wrightii are now excluded from the regional flora, and several related taxa from China, Taiwan, and the Philippines are treated as synonyms. This study unravels the deep phylogenetic relationships within Hymenophyllum subg. Mecodium in Taiwan and Eastern Asia.

Sign in / Sign up

Export Citation Format

Share Document