@article {9246, title = {Molecular ecology of the freshwater shrimp Caridina natalensis and comparative analysis with other amphidromous species (Decapoda, Teleostei, and Gastropoda)}, journal = {Hydrobiologia}, year = {2023}, month = {Jun-26-2023}, abstract = {Due to their life cycle shared between rivers and oceans, amphidromous organisms serve as intriguing models for studying biogeography. To investigate the implications of their unique life history, we examined the population structure of the amphidromous shrimp Caridina natalensis across its known range in the South Western Indian Ocean. A total of 118 specimens were collected from 7 islands (Mayotte, Moh{\'e}li, Mah{\'e}, Praslin, Silhouette, Mauritius and Madagascar) and the African mainland (South Africa), and their 16S rRNA and Cox1 mitochondrial genes were sequenced. Our findings reveal significant regional structure among archipelagos, suggesting complex patterns of dispersal involving successive events of extinction-recolonization. By conducting a comparative analysis with six other amphidromous species from the South Western Indian Ocean, based on literature sources, we were able to draw conclusions regarding the amphidromous biogeography of the area. Furthermore, we propose a novel classification of amphidromous species, considering their population structure and life history traits. We defined four categories of increasing dispersal abilities and decreasing genetic population structure: 1. Land-locked species; 2. Species with reduced or facultative amphidromy; 3. Species with common amphidromy; and 4. Super-amphidromous species. Lastly, we identified the Comoros Islands (namely Mayotte and Moh{\'e}li) as a critical area for the dispersal of amphidromous species, emphasizing the need for prioritizing conservation efforts in this region.}, issn = {0018-8158}, doi = {10.1007/s10750-023-05283-7}, url = {https://link.springer.com/10.1007/s10750-023-05283-7}, author = {de Mazancourt, Valentin and Ahmed Abdou and Castelin, Magalie and Ellien, C{\'e}line and Clara Lord and Marion Mennesson and Renneville, Cl{\'e}mentine and Marquet, G{\'e}rard and Philippe Keith} } @article {3727, title = {Morphological changes during the transition from freshwater to sea water in an amphidromous goby, Sicyopterus lagocephalus (Pallas 1770) (Teleostei).}, journal = {Ecology of Freshwater fish}, volume = {25}, year = {2016}, pages = {48-59}, abstract = {

The widely distributed amphidromous goby Sicyopterus lagocephalus needs drastic change of habitat to
fulfil its life cycle: adults live and spawn in rivers, where eggs hatch into prolarvae that have to reach the sea to
acquire characteristics of planktonic larvae. Postlarvae return to rivers where they recruit and grow to the adult
reproductive stage. Here, we describe the prolarval stages, namely from hatching to first contact with sea water, as
well as the first marine larval stages. The observations were made under experimental conditions. We described 3
prolarval substages in freshwater (L1a{\textendash}L1c). Prolarvae present a slight but visible ontogenetic development in
freshwater, during which the yolk sac begins to reduce, the pigmentation increases on the body and in the eyes, and
the lenses appear, although the eyes are not functional. Prolarvae need to reach the sea in a maximum of 96 h to
pursue their development. Their transfer in sea water at a salinity of 36.5 induces important morphological
modifications (i.e. yolk sac full absorption, appearance of pectoral fins, migration of the eyes in anterolateral
position of the head, opening of mouth and anus), enabling the organisms to adapt to their new environment. This
marine stage is divided into two substages: L2a corresponding to the organisation of the morphological structures
adapted to the marine environment and L2b during which these morphological structures become functional.
Whether it is in freshwater or sea water, the duration of the substages depends on the water temperature, but is
similar for all individuals for a given temperature.

}, keywords = {amphidromy, larval development, larval morphology, Reunion Island, Sicyopterus lagocephalus}, author = {Ellien, C{\'e}line and Werner, Ugo and Philippe Keith} }