Pubblicazione scientifica

Ontogeny of juvenile freshwater pearl mussels, Margaritifera margaritifera (Bivalvia: Margaritiferidae)

FILONE TECNOLOGICO	TEMA
economia circolare e sostenibilità
produzione e raccolta

RIASSUNTO

The gills of juvenile freshwater bivalves undergo a complex morphogenesis that may correlate with changes in feeding ecology, but ontogenic studies on juvenile mussels are rare. Scanning electron microscopy was used to examine the ultrastructure and ontogeny of 117 juvenile freshwater pearl mussels (Margaritifera margaritifera) ranging in age from 1–44 months and length from 0.49–8.90 mm. Three stages of gill development are described. In Stage 1 (5–9 inner demibranch filaments), only unreflected inner demibranch filaments were present. In Stage 2 (9–17 inner demibranch filaments), inner demibranch filaments began to reflect when shell length exceeded 1.13 mm, at 13–16 months old. Reflection began in medial filaments and then proceeded anterior and posterior. In Stage 3 (28–94 inner demibranch filaments), outer demibranch filaments began developing at shell length > 3.1 mm and about 34 months of age. The oral groove on the inner demibranch was first observed in 34 month old specimens > 2.66 mm but was never observed on the outer demibranch. Shell length (R2 = 0.99) was a better predictor of developmental stage compared to age (R2 = 0.84). The full suite of gill ciliation was present on filaments in all stages. Interfilamentary distance averaged 31.3 μm and did not change with age (4–44 months) or with size (0.75–8.9 mm). Distance between laterofrontal cirri couplets averaged 1.54 μm and did not change significantly with size or age. Labial palp primordia were present in even the youngest individuals but ciliature became more diverse in more developed individuals. Information presented here is valuable to captive rearing programmes as it provides insight in to when juveniles may be particularly vulnerable to stressors due to specific ontogenic changes. The data are compared with two other recent studies of Margaritifera development.

DATA

Data di pubblicazione: 28/03/2018

AUTORI

LAVICTOIRE LOUISE
RAMSEY ANDREW D
MOORKENS EVELYN A
SOUCH GRAHAM
BARNHART M CHRISTOPHER

ENTE DI AFFERENZA

FRESHWATER BIOLOGICAL ASSOC FERRY LANDING FAR SAWREY AMBLESIDE CUMBRIA UK
CTR WILDLIFE CONSERVATION UNIV CUMBRIA AMBLESIDE CUMBRIA UK
COLLEGE OF LIFE & NATURAL SCIENCES UNIV DERBY DERBY UK
UNIV DUBLIN TRINITY COLLEGE DUBLIN IRELAND
DEPT BIOLOGY MISSOURI STATE UNIV SPRINGFIELD MO USA
MUSEUM NATL D HISTOIRE NATURELLE FRANCE

RIVISTA

PLoS ONE, 13(3), e0193637

IMPACT FACTOR

2,870

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