Short-term stress for long-lasting otolith morphology — brief embryological stress disturbance can reorient otolith ontogenetic trajectory

International audienc

Démêler et quantifier les sources de variation des otolithes à multiples échelles. Nouvelle méthode de partition de la variabilité morphologique à l'aide d'arbres de classification et de régression

RésuméNational audienc

The use of geometric morphometrics in disentangling sources of shape/size variation in monogenean haptoral hard parts. Insights into modularity

International audienc

Multidisciplinarité et décloisonnement en parasitologie : exemples en taxonomie et biologie évolutive

National audienc

When the presence of a vateritic otolith has morphological effect on its aragonitic partner: trans-lateral compensation induces bias in microecological patterns in one-side-only vateritic otolith

In many teleost species, aragonite is the normal form of calcium carbonate in sagittal otoliths. In the case of one-side-only (OSO) vateritic otoliths (abnormal crystalline structure), morphological investigations are systematically conducted on the other side. The implicit assumption is that the morphological information on the aragonitic side remains unaffected by the presence of vaterite on the other side. However, the extent to which this assumption is met has never been explored. Applying geometric morphometrics on experimentally maintained brown trout (Salmo trutta) revealed incongruent variational patterns and mean shape differences between OSO and two-sided aragonitic otoliths, possibly due to trans-lateral compensation to preserve their auditory function. More specifically, fully aragonitic pairs of otoliths are more prone to exhibit microecological variations compared with OSO vateritic pairs. Simulation emphasizes the relative robustness of both micro- and macroecological effects until a high proportion of OSO vateritic otoliths is used. Given that otolith shape analysis provides a useful basis for stock separation, care should be taken when interpreting otolith shape in the presence of vateritic otoliths.</jats:p

Is host-switch stressful for parasites ? Host-parasite evolutionary history affects the degree of fluctuating asymmetry in the attachment apparatus of gill parasites

National audienc

Extracting environmental histories from sclerochronological structures - Recursive partitioning as a mean to explore multielemental composition of fish otolith

International audienc

Démêler et quantifier les sources de variation morphologique à multiples échelles. Nouvelle méthode de partition de la disparité morphologique à l'aide d'arbres de classification et de régression

National audienc

Disentangling and quantifying sources of otolith shape variation across multiple scales using a new hierarchical partitioning approach

International audienc

When the presence of a vateritic otolith has morphological effect on its aragonitic partner: trans-lateral compensation induces bias in microecological patterns in one-side-only vateritic otolith

In many teleost species, aragonite is the normal form of calcium carbonate in sagittal otoliths. In the case ofone-side-only (OSO) vateritic otoliths (abnormal crystalline structure), morphological investigations are systematically conducted on the other side. The implicit assumption is that the morphological information on the aragonitic side remains unaffected by the presence of vaterite on the other side. However, the extent to which this assumption is met has never been explored. Applying geometric morphometrics on experimentally maintained brown trout (Salmo trutta) revealed incongruent variational patterns and mean shape differences between OSO and two-sided aragonitic otoliths, possibly due to trans-lateral compensation to preserve their auditory function. More specifically, fully aragonitic pairs of otoliths are more prone to exhibit microecological variations compared with OSO vateritic pairs. Simulation emphasizes the relative robustness of both micro- and macroecological effects until a high proportion of OSO vateritic otoliths is used. Given that otolith shape analysis provides a useful basis for stock separation, care should be taken when interpreting otolith shape in the presence of vateritic otolith