Diet and growth of juvenile queen conch Lobatus gigas (Gastropoda: Strombidae) in native, mixed and invasive seagrass habitats

Juvenile queen conch are primarily associated with native seagrass such as Thalassia testudinum in large parts of their range in the Caribbean and the southern Gulf of Mexico. Here, a number of non-native seagrass species have been introduced including Halophila stipulacea, which is natural to the R...

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Bibliographic Details
Published in:Marine ecology. Progress series (Halstenbek) 2019-07, Vol.621, p.143-154
Main Authors: Boman, Erik Maitz, Bervoets, Tadzio, de Graaf, Martin, Dewenter, Jana, Maitz, Anna, Schlochtern, Melanie P. Meijer Zu, Stapel, Johan, Smaal, Aad C., Nagelkerke, Leopold A. J.
Format: Article
Language:English
Subjects:
Benthos
Caribbean
Diatoms
Diet
Grasses
Growth rate
Halophila stipulacea
Indigenous species
Introduced species
Invasive species
Marine molluscs
Mats
Mollusca
Nutrition
Organic matter
Particulate organic matter
Probability theory
Sea grasses
Sediment
Sediments
Stable isotope
Stable isotopes
Strombus gigas
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Summary:Juvenile queen conch are primarily associated with native seagrass such as Thalassia testudinum in large parts of their range in the Caribbean and the southern Gulf of Mexico. Here, a number of non-native seagrass species have been introduced including Halophila stipulacea, which is natural to the Red Sea and the Indo-Pacific. In the Caribbean, H. stipulacea often creates dense continuous mats with little or no sediment exposed, compared to native seagrass, which grows much less dense. We examined the diet and growth of juvenile conch in both native, mixed, and invasive seagrass beds using stable isotope analysis and an in situ growth enclosure experiment. Organic material in the sediment (i.e. benthic diatoms and particulate organic matter) was found to be the most important source of carbon and nitrogen for juvenile queen conch in all 3 habitats investigated, and there was a significantly higher probability of positive growth in the native seagrass compared to the invasive seagrass. Due to the importance of the organic material in the sediment as a source of nutrition for juvenile conch, limited access to the sediment in the invasive seagrass can potentially cause inadequate nutritional conditions to sustain high growth rates. Thus, it is likely that there is a negative effect on juvenile queen conch growth currently inhabiting invasive seagrass beds, compared to native seagrass beds, when other potential sources of nutrition are not available.
ISSN:0171-8630
1616-1599
DOI:10.3354/meps12990