Fluorescence patterns and diversity of hydrozoans from Bocas del Toro, Panama
2024
Beckmann,Lara M. | Vincent,Bridget A. | León,Alexandra De | Masterman,Jessica | Lau,Emily-S. | Haddock,Steven-H.D.
Abstract. Many metazoans contain molecules capable of fluorescence, which is the absorption and re-emission of light. As the anatomical distribution, or patterning, of these molecules varies across taxa, fluorescence patterns may serve as a powerful diagnostic tool in taxonomy and ecology. However, species-specific fluorescence patterns in marine invertebrates are poorly understood. Here, we show that hydrozoans exhibit diverse fluorescence patterns, which may result from molecules that are produced intrinsically or obtained from dietary sources. We surveyed 5 orders of hydrozoans, including siphonophores, hydromedusae, and hydroids, from pelagic and benthic marine environments in Bocas del Toro, Panama. Our findings show that fluorescence patterns are highly prevalent and may vary across hydrozoan species throughout development. Most hydrozoan taxa exhibited some form of fluorescence, with variation observed among life stages and body parts. Fluorescence was documented in 88% of hydromedusae (Leptothecata, Anthoathecata, Limnomedusae, and Narcomedusae), 50% of hydroids, and 75% of siphonophores. Our results illustrate how fluorescence patterns can serve as a useful diagnostic tool to explore marine biodiversity, highlighting the need for further documentation of fluorescence patterns across marine taxa and research into the molecules that underlie this phenomenon.
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