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Using external morphology as a proxy for stomach size in Hemigrapsus sanguineus

Fletcher, Laura S.
; 
Blakeslee, April M. H.
; 
Crane, Laura C.
; 
Repetto, Michele F.
; 
Toscano, Benjamin J.
; 
Griffen, Blaine D.
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Journal article
Date
2024-05-02
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Biology
Subject
Hemigrapsus sanguineus
 Diet quality
 Gut morphology
 Individual variation
 Progastric carapace region
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https://scholarshare.temple.edu/handle/20.500.12613/12074
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Repetto-JournalArticle-2024-05.pdf
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https://doi.org/10.1002/ece3.11344
Abstract
Stomach morphology can provide insights into an organism's diet. Gut size or lengthis typically inversely related to diet quality in most taxa, and has been used to assessdiet quality in a variety of systems. However, it requires animal sacrifice and time-consuming dissections. Measures of external morphology associated with diet maybe a simpler, more cost-effective solution. At the species level, external measures ofthe progastric region of the carapace in brachyuran crabs can predict stomach sizeand diet quality, with some suggestion that this approach may also work to examineindividual diet preferences and specialization at the individual level; if so, the size ofthe progastric region could be used to predict trends in diet quality and consumptionfor individuals, which would streamline diet studies in crabs. Here, we tested whetherexternal progastric region size predicts internal stomach size across latitude and timeof year for individuals of the invasive Asian shore crab Hemigrapsus sanguineus. Wefound that the width of the progastric region increased at a faster rate with body sizethan stomach width. In addition, the width of the progastric region followed differenttrends across sites and over time compared to stomach width. Our results thereforesuggest that the progastric region may not be used as a proxy for stomach size varia-tion across individuals.
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Citation
Fletcher, L. S., Blakeslee, A. M. H., Crane, L. C., Repetto, M. F., Toscano, B. J., & Griffen, B. D. (2024). Using external morphology as a proxy for stomach size in Hemigrapsus sanguineus. Ecology and Evolution, 14, e11344. https://doi.org/10.1002/ece3.11344
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Wiley
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Ecology and Evolution, Vol. 14, Iss. 5
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