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Collins SB, Bracken-Grissom HD. The language of light: a review of bioluminescence in deep-sea decapod shrimps. Biol Rev Camb Philos Soc 2024; 99:1806-1830. [PMID: 38706106 DOI: 10.1111/brv.13093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 04/11/2024] [Accepted: 04/22/2024] [Indexed: 05/07/2024]
Abstract
In the dark, expansive habitat of the deep sea, the production of light through bioluminescence is commonly used among a wide range of taxa. In decapod crustaceans, bioluminescence is only known in shrimps (Dendrobranchiata and Caridea) and may occur in different modes, including luminous secretions that are used to deter predators and/or from specialised light organs called photophores that function by providing camouflage against downwelling light. Photophores exhibit an extensive amount of morphological variation across decapod families: they may be internal (of hepatic origin) or embedded in surface tissues (dermal), and may possess an external lens, suggesting independent origins and multiple functions. Within Dendrobranchiata, we report bioluminescence in Sergestidae, Aristeidae, and Solenoceridae, and speculate that it may also be found in Acetidae, Luciferidae, Sicyonellidae, Benthesicymidae, and Penaeidae. Within Caridea, we report bioluminescence in Acanthephyridae, Oplophoridae, Pandalidae, and new observations for Pasiphaeidae. This comprehensive review includes historic taxonomic literature and recent studies investigating bioluminescence in all midwater and deep benthic shrimp families. Overall, we report known or suspected bioluminescence in 157 species across 12 families of decapod shrimps, increasing previous records of bioluminescent species by 65%. Mounting evidence from personal observations and the literature allow us to speculate the presence of light organs in several families thought to lack bioluminescence, making this phenomenon much more common than previously reported. We provide a detailed discussion of light organ morphology and function within each group and indicate future directions that will contribute to a better understanding of how deep-sea decapods use the language of light.
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Affiliation(s)
- Stormie B Collins
- Department of Biological Sciences, Florida International University, Institute of Environment, 3000 NE 151st St, North Miami, FL, 33181, USA
| | - Heather D Bracken-Grissom
- Department of Biological Sciences, Florida International University, Institute of Environment, 3000 NE 151st St, North Miami, FL, 33181, USA
- Department of Invertebrate Zoology, Smithsonian Institution, National Museum of Natural History, Washington, WA, 20013-7012, USA
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Chong KL, Grahn A, Perl CD, Sumner-Rooney L. Allometry and ecology shape eye size evolution in spiders. Curr Biol 2024; 34:3178-3188.e5. [PMID: 38959880 DOI: 10.1016/j.cub.2024.06.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/11/2024] [Accepted: 06/07/2024] [Indexed: 07/05/2024]
Abstract
Eye size affects many aspects of visual function, but eyes are costly to grow and maintain. The allometry of eyes can provide insight into this trade-off, but this has mainly been explored in species that have two eyes of equal size. By contrast, animals possessing larger visual systems can exhibit variable eye sizes within individuals. Spiders have up to four pairs of eyes whose sizes vary dramatically, but their ontogenetic, static, and evolutionary allometry has not yet been studied in a comparative context. We report variable dynamics in eye size across 1,098 individuals in 39 species and 8 families, indicating selective pressures and constraints driving the evolution of different eye pairs and lineages. Supplementing our sampling with a recently published phylogenetically comprehensive dataset, we confirmed these findings across more than 400 species; found that ecological factors such as visual hunting, web building, and circadian activity correlate with eye diameter; and identified significant allometric shifts across spider phylogeny using an unbiased approach, many of which coincide with visual hunting strategies. The modular nature of the spider visual system provides additional degrees of freedom and is apparent in the strong correlations between maximum/minimum investment and interocular variance and three key ecological factors. Our analyses suggest an antagonistic relationship between the anterior and posterior eye pairs. These findings shed light on the relationship between spider visual systems and their diverse ecologies and how spiders exploit their modular visual systems to balance selective pressures and optical and energetic constraints.
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Affiliation(s)
- Kaylin L Chong
- Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138, USA; Oxford University Museum of Natural History, University of Oxford, Oxford OX1 3PW, UK.
| | - Angelique Grahn
- Institut für Biologie, Humboldt Universität, Invalidenstrasse 42, 10115 Berlin, Germany
| | - Craig D Perl
- School of Life Sciences, Arizona State University, Tempe, AZ 85281, USA
| | - Lauren Sumner-Rooney
- Oxford University Museum of Natural History, University of Oxford, Oxford OX1 3PW, UK.
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Iwanicki T, Steck M, Bracken-Grissom H, Porter ML. Localization of multiple opsins in ocular and non-ocular tissues of deep-sea shrimps and the first evidence of co-localization in a rhabdomeric R8 cell (Caridea: Oplophoroidea). Vision Res 2024; 219:108403. [PMID: 38581820 DOI: 10.1016/j.visres.2024.108403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 03/14/2024] [Accepted: 03/25/2024] [Indexed: 04/08/2024]
Abstract
Bioluminescence is a prevalent phenomenon throughout the marine realm and is often the dominant source of light in mesophotic and aphotic depth horizons. Shrimp belonging to the superfamily Oplophoroidea are mesopelagic, perform diel vertical migration, and secrete a bright burst of bioluminescent mucous when threatened. Species in the family Oplophoridae also possess cuticular light-emitting photophores presumably for camouflage via counter-illumination. Many species within the superfamily express a single visual pigment in the retina, consistent with most other large-bodied mesopelagic crustaceans studied to date. Photophore-bearing species have an expanded visual opsin repertoire and dual-sensitivity visual systems, as evidenced by transcriptomes and electroretinograms. In this study, we used immunohistochemistry to describe opsin protein localization in the retinas of four species of Oplophoroidea and non-ocular tissues of Janicella spinicauda. Our results show that Acanthephyra purpurea (Acanthephyridae) retinas possess LWS-only photoreceptors, consistent with the singular peak sensitivity previously reported. Oplophoridae retinas contain two opsin clades (LWS and MWS) consistent with dual-sensitivity. Oplophorus gracilirostris and Systellaspis debilis have LWS in the proximal rhabdom (R1-7 cells) and MWS2 localized in the distal rhabdom (R8 cell). Surprisingly, Janicella spinicauda has LWS in the proximal rhabdom (R1-7) and co-localized MWS1 and MWS2 opsin paralogs in the distal rhabdom, providing the first evidence of co-localization of opsins in a crustacean rhabdomeric R8 cell. Furthermore, opsins were found in multiple non-ocular tissues of J. spinicauda, including nerve, tendon, and photophore. These combined data demonstrate evolutionary novelty and opsin duplication within Oplophoridae, with implications for visual ecology, evolution in mesophotic environments, and a mechanistic understanding of adaptive counter-illumination using photophore bioluminescence.
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Affiliation(s)
- Tom Iwanicki
- The Earth Commons Institute, Georgetown University, Washington, DC 20057, United States; School of Life Sciences, University of Hawai'i at Mānoa, Honolulu, HI 96822, United States; Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology, Washington, DC 20013, United States.
| | - Mireille Steck
- School of Life Sciences, University of Hawai'i at Mānoa, Honolulu, HI 96822, United States
| | - Heather Bracken-Grissom
- Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology, Washington, DC 20013, United States; Institute of Environment, Department of Biology, Florida International University, North Miami, FL 33181, United States
| | - Megan L Porter
- School of Life Sciences, University of Hawai'i at Mānoa, Honolulu, HI 96822, United States
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Chang SC, Ahyong ST, Tsang LM. Molecular phylogeny of deep-sea blind lobsters of the family Polychelidae (Decapoda: Polychelida), with implications for the origin and evolution of these "living fossils". Mol Phylogenet Evol 2024; 192:107998. [PMID: 38142793 DOI: 10.1016/j.ympev.2023.107998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 12/14/2023] [Accepted: 12/20/2023] [Indexed: 12/26/2023]
Abstract
A comprehensive molecular analysis of the deep-sea blind lobsters of the family Polychelidae, often referred to as "living fossils", is conducted based on all six modern genera and 27 of the 38 extant species. Using six genetic markers from both mitochondrial and nuclear genomes, the molecular phylogenetic results differ considerably from previous morphological analyses and reveal the genera Polycheles and Pentacheles to be para- or polyphyletic. As the splitting of Polycheles has strong support from both molecular and morphological data, two new genera, Dianecheles and Neopolycheles, are erected for those species excluded from the clade containing the type species of Polycheles. The pattern of polyphyly of Pentacheles, however, is not robustly resolved, so it is retained as a single genus. Fossil evidence suggests that fossil polychelids inhabited deep-sea environments as early as the Early to Middle Jurassic, demonstrating the enduring adaptation of extant polychelid species to the deep-sea. Time-calibrated phylogeny suggested that modern polychelids probably had an Atlantic origin during the Jurassic period. Since their emergence, this ancient lobster group has continued to diversify, particularly in the West Pacific, and has colonized the abyssal zone, with the deepest genus, Willemoesia, representing the more 'derived' members among extant polychelids. Differences in eye reduction among extant polychelid genera highlight the necessity for ongoing investigations to ascertain the relative degree of functionality of their eyes, if they indeed retain any function.
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Affiliation(s)
- Su-Ching Chang
- Department of Biological Resources, National Chiayi University, Chiayi 600355, Taiwan, ROC
| | - Shane T Ahyong
- Australian Museum, 1 William St, Sydney, NSW 2010, Australia; School of Biological, Earth & Environmental Sciences, University of New South Wales, Kensington, NSW 2052, Australia
| | - Ling-Ming Tsang
- Simon F. S. Li Marine Science Laboratory, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
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Notar JC, Meja B, Johnsen S. Testing Mechanisms of Vision: Sea Urchin Spine Density Does Not Correlate With Vision-Related Environmental Characteristics. Integr Comp Biol 2022; 62:icac119. [PMID: 35867967 DOI: 10.1093/icb/icac119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Sea urchins do not have eyes, yet they are capable of resolving simple images. One suggestion as to the mechanism of this capability is that the spines shade off-axis light from reaching the photosensitive test (skeleton). Following this hypothesis, the density of spines across the body determines the resolution (or sharpness) of vision by restricting the incidence of light on the photosensitive skin of the animal, creating receptive areas of different minimum resolvable angles. Previous studies have shown that predicted resolutions in several species closely match behaviorally-determined resolutions, ranging from 10º to 33º. Here we present a comparative morphological survey of spine density with species representatives from 22 of the 24 families of regular sea urchins (Class Echinoidea) in order to better understand the relative influences of phylogenetic history and three visually-relevant environmental variables on this trait. We estimated predicted resolutions by calculating spine densities from photographs of spineless sea urchin tests (skeletons). Analyses showed a strong phylogenetic signal in spine density differences between species. Phylogenetically-corrected Generalized Least Squares (PGLS) models incorporating all habitat parameters were the most supported, and no particular parameter was significantly correlated with spine density. Spine density is subject to multiple, overlapping selective pressures and therefore it is possible that either: 1) spine density does not mediate spatial vision in echinoids, or 2) visual resolution via spine density is a downstream consequence of sea urchin morphology rather than a driving force of adaptation in these animals.
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Affiliation(s)
- Julia C Notar
- Department of Biology, Duke University, Durham, NC 27708, USA
| | - Bernice Meja
- Department of Biology, Duke University, Durham, NC 27708, USA
| | - Sönke Johnsen
- Department of Biology, Duke University, Durham, NC 27708, USA
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