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Article: Metabolic and behavioural effects of hermit crab shell removal techniques: Is heating less invasive than cracking?

Burciaga, Luis M / Alcaraz, Guillermina

Animal welfare (South Mimms, England)

2023 Volume 32, Page(s) e24

Abstract: Hermit crabs (Paguroidea; Latreille 1802) offer great opportunities to study animal behaviour and physiology. However, the animals' size and sex cannot be determined when they are inside their shell; information crucial to many experimental designs. Here, ...

Abstract	Hermit crabs (Paguroidea; Latreille 1802) offer great opportunities to study animal behaviour and physiology. However, the animals' size and sex cannot be determined when they are inside their shell; information crucial to many experimental designs. Here, we tested the effects of the two most common procedures used to make crabs leave their shells: heating the shell apex and cracking the shell with a bench press. We compared the effects of each of the two procedures on the metabolic rate, hiding time, and duration of the recovery time relative to unmanipulated hermit crabs. The hermit crabs forced to abandon their shell through heating increased their respiratory rate shortly after the manipulation (1 h) and recovered their metabolic rate in less than 24 h, as occurs in individuals suddenly exposed to high temperatures in the upper-intertidal zone. Hermit crabs removed from their shells via cracking spent more time hiding in their new shells; this effect was evident immediately after the manipulation and lasted more than 24 h, similar to responses exhibited after a life-threatening predator attack. Both methods are expected to be stressful, harmful, or fear-inducing; however, the temperature required to force the crabs to abandon the shell is below the critical thermal maxima of most inhabitants of tropical tide pools. The wide thermal windows of intertidal crustaceans and the shorter duration of consequences of shell heating compared to cracking suggest heating to be a less harmful procedure for removing tropical hermit crabs from their shells.
Language	English
Publishing date	2023-02-28
Publishing country	England
Document type	Journal Article
ISSN	0962-7286
ISSN	0962-7286
DOI	10.1017/awf.2023.17
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Article: Thermal threshold and interspecific competition help explain intertidal hermit crab assemblages.

Garcia-Cardenas, Eduardo Everardo / Burciaga, Luis M / Alcaraz, Guillermina

Journal of thermal biology

2023 Volume 118, Page(s) 103728

Abstract: Habitat heterogeneity promotes species diversity by providing a variety of abiotic and biotic conditions, whose impact on performance varies among species. Then, mobile species would be expected to move to areas whose conditions maximize their fitness. ... ...

Abstract	Habitat heterogeneity promotes species diversity by providing a variety of abiotic and biotic conditions, whose impact on performance varies among species. Then, mobile species would be expected to move to areas whose conditions maximize their fitness. However, biotic pressures such as interspecific competition can push subordinate species into suboptimal areas, impeding this matching. The tropical hermit crab Clibanarius albidigitus occupies mostly upper intertidal sites where they can experience extreme environmental conditions. Meanwhile, its stronger agonistic competitor, Calcinus californiensis, mostly inhabits more moderate conditions at the mid intertidal. We estimated the avoidance threshold of the two hermit crab species to increasing water temperatures to help explain their intertidal distribution. We also compared the avoidance threshold of Cli. albidigitus to rising temperatures when presented alone and in the presence of chemical cues of its competitor to assess potential competitive niche exclusion. The avoidance threshold was measured in experimental tanks with a ramp that led from the water to an air-exposed platform; the threshold was defined as the temperature at which individuals emerged and remained air-exposed. Clibanarius albidigitus emerged at a higher temperature than its competitor, showing a higher thermal tolerance and potentially explaining its distribution in the upper intertidal. In the presence of Cal. californiensis, Cli. albidigitus emerged at lower temperature than when alone, likely as a strategy to reduce competition with stronger agonistic competitors, even at the cost of coping with harsh conditions. Our results support the hypothesis that competitive habitat exclusion contributes to explaining hermit crab assemblages.
MeSH term(s)	Humans ; Animals ; Anomura ; Ecosystem ; Temperature ; Ecology ; Water
Chemical Substances	Water (059QF0KO0R)
Language	English
Publishing date	2023-10-21
Publishing country	England
Document type	Journal Article
ZDB-ID	1498364-3
ISSN	1879-0992 ; 0306-4565
ISSN (online)	1879-0992
ISSN	0306-4565
DOI	10.1016/j.jtherbio.2023.103728
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Article ; Online: Synthesis of Photochromic Phosphines by Pd-Catalyzed Annulation Reaction of Alkynes Bearing Phosphinyl Substituent with a Silacyclopropene.

Selvaraj, Akshitha / Cordier, Marie / Devillard, Marc / Alcaraz, Gilles

Chemistry (Weinheim an der Bergstrasse, Germany)

2023 Volume 29, Issue 66, Page(s) e202302374

Abstract: The synthesis of phosphines with light controlled basicity is presented in this study. A methodological approach for the preparation of these unconventional photochromic phosphines based on a dithienylethene organic moiety is reported. It relies on the ... ...

Abstract	The synthesis of phosphines with light controlled basicity is presented in this study. A methodological approach for the preparation of these unconventional photochromic phosphines based on a dithienylethene organic moiety is reported. It relies on the palladium-catalyzed annulation of alkynyl phosphines in the presence of a 2,3-Dithienylsilacyclopropene. Accordingly, a diphenyphosphino moiety is connected to the organic photochrome thanks to different linkers. Their influence on the photochromism and on the phosphinyl group basicity is studied and evaluated based on experimental an NMR descriptor as well as DFT calculations.
Language	English
Publishing date	2023-10-11
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1478547-X
ISSN	1521-3765 ; 0947-6539
ISSN (online)	1521-3765
ISSN	0947-6539
DOI	10.1002/chem.202302374
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Article ; Online: 1,2-Palladasilacyclobutene: The Missing Link in the Pd-Catalyzed Annulation of Alkynes for the Silirene-to-Silole Transformation.

Devillard, Marc / Dinoi, Chiara / Del Rosal, Iker / Orione, Clément / Cordier, Marie / Alcaraz, Gilles

Inorganic chemistry

2023 Volume 62, Issue 19, Page(s) 7250–7263

Abstract: The palladium-catalyzed annulation reaction of alkynes enables an attractive approach to siloles. Their access from silirenes and terminal alkynes proved rather general, involving reactive intermediates that have remained elusive to date. Starting from 1, ...

Abstract	The palladium-catalyzed annulation reaction of alkynes enables an attractive approach to siloles. Their access from silirenes and terminal alkynes proved rather general, involving reactive intermediates that have remained elusive to date. Starting from 1,2-bis(3-thienyl)silirene as a source of photochromic siloles, the mechanism of the annulation reaction has been revisited, and palladasilacyclobutenes resulting from the activation of the silirene could be isolated and thoroughly characterized (NMR, X-ray, and DFT). Their role as reactive intermediates and their fate in the course of the reaction were also studied in situ. In combination with in-depth DFT calculations, a clearer picture of the mechanism and the reactive key species is disclosed.
Language	English
Publishing date	2023-05-02
Publishing country	United States
Document type	Journal Article
ZDB-ID	1484438-2
ISSN	1520-510X ; 0020-1669
ISSN (online)	1520-510X
ISSN	0020-1669
DOI	10.1021/acs.inorgchem.3c00045
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Article ; Online: Thyroid gland: a rare site of metastasis.

Orlandi, Ana María / Alcaraz, Graciela / Bielski, Laila / Brenta, Gabriela / Jozami, Lorena Castro / Cavallo, Andrea / Guerra, Jorgelina / Zund, Santiago

Endocrine

2024 Volume 84, Issue 2, Page(s) 607–614

Abstract: Purpose: Despite its rich vascularity, metastasis (MTS) to the thyroid tissue is unusual, ranging from 1 to 3%. This entity is not usually considered as differential diagnosis and is not included in the upfront approach in patients with thyroid nodules. ...

Abstract	Purpose: Despite its rich vascularity, metastasis (MTS) to the thyroid tissue is unusual, ranging from 1 to 3%. This entity is not usually considered as differential diagnosis and is not included in the upfront approach in patients with thyroid nodules. Once diagnosed, treatment is controversial. The aim of this study was to evaluate diagnosis, treatment, and outcome at the end of follow-up in patients with a diagnosis of MTS to the thyroid. Methods: A retrospective multicenter study was designed from 1985 to 2022; 29 patients with MTS to the thyroid gland were included in the analysis. Results: Clinical presentation included the presence of a nodular goiter (65.5%), compression symptoms (17.2%), diffuse goiter (10.3%), and suspicious lymph nodes in the neck (7%). Primary tumor sites were: kidney (44.8%), breast (24.1%), lung (13.8%), neuroendocrine system (6.9%), colon (3.4%), cervix (3.4%), and ovary (3.4%). In 18/23 patients, suspicious ultrasound criteria for malignancy were described. Preoperative diagnosis was made in 23/27 patients by FNA and confirmed in 18 cases by immunohistochemistry. Seventeen patients underwent surgery. At the end of the follow-up, 19 patients had died of oncological disease, and six were alive (2/6 disease-free with isolated intrathyroidal MTS). Conclusion: Renal carcinoma was the tumor that most frequently metastasized to the thyroid gland. Immunodiagnosis was a very useful tool for etiological confirmation. Patients with MTS to the thyroid gland as a unique site had a more favorable course compared to patients with multiple metastatic sites. Finally, outcomes and prognosis essentially depended on the biology of the primary tumor.
MeSH term(s)	Humans ; Female ; Middle Aged ; Male ; Retrospective Studies ; Thyroid Neoplasms/pathology ; Aged ; Adult ; Thyroid Gland/pathology ; Aged, 80 and over ; Kidney Neoplasms/pathology
Language	English
Publishing date	2024-01-15
Publishing country	United States
Document type	Journal Article ; Multicenter Study
ZDB-ID	1194484-5
ISSN	1559-0100 ; 1355-008X ; 0969-711X
ISSN (online)	1559-0100
ISSN	1355-008X ; 0969-711X
DOI	10.1007/s12020-023-03626-x
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Article ; Online: The energetic costs of living in the surf and impacts on zonation of shells occupied by hermit crabs.

Alcaraz, Guillermina / Toledo, Brenda / Burciaga, Luis M

The Journal of experimental biology

2020 Volume 223, Issue Pt 16

Abstract: Crashing waves create a hydrodynamic gradient in which the most challenging effects occur at the wave breaking zone and decrease towards the upper protected tide pools. Hydrodynamic forces depend on the shape of the submerged body; streamlined shapes ... ...

Abstract	Crashing waves create a hydrodynamic gradient in which the most challenging effects occur at the wave breaking zone and decrease towards the upper protected tide pools. Hydrodynamic forces depend on the shape of the submerged body; streamlined shapes decrease drag forces compared with bluff or globose bodies. Unlike other animals, hermit crabs can choose their shell shape to cope with the effects of water flow. Hermit crabs occupy larger and heavier shells (conical shape) in wave-exposed sites than those used in protected areas (globose shape). First, we investigated whether a behavioral choice could explain the shells used in sites with different wave action. Then, we experimentally tested whether the shells most frequently used in sites with different wave action reduce the energetic cost of coping with water flow. Metabolic rate was measured using a respirometric system fitted with propellers in opposite walls to generate bidirectional water flow. The choice of shell size when a large array of sizes are available was consistent with the shell size used in different intertidal sites; hermit crabs chose heavier conical shells in water flow conditions than in still water, and the use of heavy conical shells reduced the energetic cost of coping with water motion. In contrast to conical shells, small globose shells imposed lower energy costs of withstanding water flow than large globose shells. The size and type of shells used in different zones of the rocky shore were consistent with an adaptive response to reduce the energetic costs of withstanding wave action.
MeSH term(s)	Animals ; Anomura ; Gastropoda ; Hydrodynamics ; Sports
Language	English
Publishing date	2020-08-24
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	218085-6
ISSN	1477-9145 ; 0022-0949
ISSN (online)	1477-9145
ISSN	0022-0949
DOI	10.1242/jeb.222703
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Article ; Online: Dithienylethene-Based Photochromic Siloles: A Straightforward and Divergent Synthetic Strategy.

Devillard, Marc / Nour Eddine, Nour / Cordier, Marie / Alcaraz, Gilles

Angewandte Chemie (International ed. in English)

2021 Volume 60, Issue 22, Page(s) 12356–12359

Abstract: A straightforward synthetic methodology for the preparation of photochromic siloles based on the dithienylethene motif is developed. It relies upon an efficient palladium-catalyzed annulation reaction of a 2,3-bis(3-thienyl)-silirene with terminal ... ...

Abstract	A straightforward synthetic methodology for the preparation of photochromic siloles based on the dithienylethene motif is developed. It relies upon an efficient palladium-catalyzed annulation reaction of a 2,3-bis(3-thienyl)-silirene with terminal alkynes in mild conditions. The reaction is functional group-tolerant and can be performed in high yields with a variety of functional terminal alkynes. It can even be extended to a polymeric polypropargylmethacrylamide (PPMA) substrate affording the corresponding photochromic polymer with different degree of photochromic unit incorporation by simply adjusting the polymer/ silirene stoichiometric ratio.
Language	English
Publishing date	2021-04-21
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2011836-3
ISSN	1521-3773 ; 1433-7851
ISSN (online)	1521-3773
ISSN	1433-7851
DOI	10.1002/anie.202102540
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Article ; Online: Hydroboration of vinyl halides with mesitylborane: a direct access to (mesityl)(alkyl)haloboranes.

Devillard, Marc / Cordier, Marie / Roisnel, Thierry / Dinoi, Chiara / Del Rosal, Iker / Alcaraz, Gilles

Chemical communications (Cambridge, England)

2022 Volume 58, Issue 10, Page(s) 1589–1592

Abstract: The direct access to (mesityl)(alkyl)haloboranes (Mes(Alk)BX) (X = Br, Cl) from mesitylborane dimer and vinyl halides is presented. The involved hydroboration reaction results in the transfer of the halogen atom from the carbon of the starting material ... ...

Abstract	The direct access to (mesityl)(alkyl)haloboranes (Mes(Alk)BX) (X = Br, Cl) from mesitylborane dimer and vinyl halides is presented. The involved hydroboration reaction results in the transfer of the halogen atom from the carbon of the starting material to the boron in the final product. The reactivity of the obtained Mes(Alk)BX has been evaluated for the synthesis of the bipyridyl boronium cations and 2-arylpyridine derived boron N^C-chelates. The formation mechanism of Mes(Alk)BX is apprended by DFT-calculations which shows that their formation involves two concomitant pathways derived from the regioslectivity of the hydroboration reaction.
Language	English
Publishing date	2022-02-01
Publishing country	England
Document type	Journal Article
ZDB-ID	1472881-3
ISSN	1364-548X ; 1359-7345 ; 0009-241X
ISSN (online)	1364-548X
ISSN	1359-7345 ; 0009-241X
DOI	10.1039/d1cc06365k
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Article ; Online: Diet, Microbes, and Cancer Across the Tree of Life: a Systematic Review.

Kapsetaki, Stefania E / Marquez Alcaraz, Gissel / Maley, Carlo C / Whisner, Corrie M / Aktipis, Athena

Current nutrition reports

2022 Volume 11, Issue 3, Page(s) 508–525

Abstract: Purpose of review: Cancers are a leading cause of death in humans and for many other species. Diet has often been associated with cancers, and the microbiome is an essential mediator between diet and cancers. Here, we review the work on cancer and the ... ...

Abstract	Purpose of review: Cancers are a leading cause of death in humans and for many other species. Diet has often been associated with cancers, and the microbiome is an essential mediator between diet and cancers. Here, we review the work on cancer and the microbiome across species to search for broad patterns of susceptibility associated with different microbial species. Recent findings: Some microbes, such as Helicobacter bacteria, papillomaviruses, and the carnivore-associated Fusobacteria, consistently induce tumorigenesis in humans and other species. Other microbes, such as the milk-associated Lactobacillus, consistently inhibit tumorigenesis in humans and other species. We systematically reviewed over a thousand published articles and identified links between diet, microbes, and cancers in several species of mammals, birds, and flies. Future work should examine a larger variety of host species to discover new model organisms for human preclinical trials, to better understand the observed variance in cancer prevalence across species, and to discover which microbes and diets are associated with cancers across species. Ultimately, this could help identify microbial and dietary interventions to diagnose, prevent, and treat cancers in humans as well as other animals.
MeSH term(s)	Animals ; Carcinogenesis ; Diet ; Humans ; Mammals/microbiology ; Microbiota ; Neoplasms
Language	English
Publishing date	2022-06-15
Publishing country	United States
Document type	Journal Article ; Review ; Systematic Review ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
ISSN	2161-3311
ISSN (online)	2161-3311
DOI	10.1007/s13668-022-00420-5
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Article ; Research data: (with research data) Predator discrimination in the hermit crab Calcinus californiensis: tight for shell breakers, loose for shell peelers

Alcaraz, Guillermina / Elsah Arce

Oikos. 2017 Sept., v. 126, no. 9

2017

Abstract: Prey exposed to predators with different hunting and feeding modes are under different selective pressures, therefore it is expected that they should exhibit plastic and adaptive antipredator responses according to current risks. The hermit crab Calcinus ...

Abstract	Prey exposed to predators with different hunting and feeding modes are under different selective pressures, therefore it is expected that they should exhibit plastic and adaptive antipredator responses according to current risks. The hermit crab Calcinus californiensis faces two contrasting predators, the shell peeler Arenaeus mexicanus that hunts by active searching and the shell breaker Eriphia squamata that hunts by ambush. In order to discover whether C. californiensis displays plastic responses depending on the type of predatory challenge, we examined the shell size preference, the hiding time, and the escape velocity of hermit crabs in the presence of chemical cues from a shell peeler, a shell breaker, and a control. We also examined the role of shell fit on the escape velocity of the hermit crabs in natural tidal pools. Crabs chose shells with a loose fit (relatively large shells) in the presence of chemical cues from the shell peeler Arenaeus and shells with a tight fit when exposed to cues from the shell breaker Eriphia. The hermit crabs hid for shorter times and moved away faster from Eriphia than from Arenaeus stimulus. The use of a tight shell favours faster movement away from the shell breaker (preâcapture strategy), but prevents the crab retracting deeper inside the shell, increasing the risk of be eaten by the shell peeler once captured. Hence, the use of loose shells that protect the crab from the shell peeler hinders fast escape. This study shows specific and plastic antipredatory responses to contrasting predators, each bringing adaptive benefits at different levels of the predator sequence.
Keywords	antipredatory behavior ; crabs ; peelers ; predators ; risk
Language	English
Dates of publication	2017-09
Size	p. 1299-1307.
Publishing place	Blackwell Publishing Ltd
Document type	Article ; Research data
Note	JOURNAL ARTICLE
ZDB-ID	207359-6
ISSN	0030-1299 ; 0030-1299
ISSN	0030-1299
DOI	10.1111/oik.03742
Database	NAL-Catalogue (AGRICOLA)

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