Temperature and salinity influence the chemistry in the pre-hatch otolith region of capelin, Mallotus villosus , during lab and field egg incubation experiments
Autor: | Alison R. Loeppky, Gail K. Davoren |
---|---|
Rok vydání: | 2018 |
Předmět: |
0106 biological sciences
education.field_of_study 010604 marine biology & hydrobiology fungi Population Capelin Zoology Aquatic Science Biology biology.organism_classification 010603 evolutionary biology 01 natural sciences Salinity medicine.anatomical_structure Productivity (ecology) Forage fish medicine Mallotus education Ecology Evolution Behavior and Systematics Egg incubation Otolith |
Zdroj: | Journal of Experimental Marine Biology and Ecology. 501:65-73 |
ISSN: | 0022-0981 |
Popis: | Identifying the natal origin of marine fish is important to understand connectivity and productivity among populations residing in different habitats. Capelin , Mallotus villosus , is a key marine forage fish species that spawns at both beach (warmer, less saline) and deep-water (15–40 m; cooler, more saline) habitats along the northeast Newfoundland coast. Currently, the contribution from each habitat to the spawning population is unknown. Previous research, where capelin eggs from known families were lab-reared, identified family-based otolith chemical signatures in the pre-hatch (embryonic) region of larvae. In this study, we investigated whether temperature and salinity influenced embryonic otolith chemistry to determine whether variation in environmental conditions would result in habitat-specific signatures, thereby overwhelming family-based signatures and allowing the identification of natal origin. Capelin eggs from many families were incubated together under controlled temperature (4, 8, 10 °C) and salinity (10, 20, 30 psu) treatments in the lab and uncontrolled conditions within each habitat in the field. Elemental concentrations (i.e., Sr, Ba, Mg, Mn) in the pre-hatch region of 1-day old larvae were quantified via LA ICP-MS. Elemental concentrations varied among individuals reared under identical conditions, likely due to family-based chemical signatures. Despite this variation, mean elemental concentrations differed when mean temperatures varied by ≥4 °C between treatments (lab) and rearing habitats (field), resulting in high treatment- and habitat-specific classification success (~73–88%) of individuals. In contrast, embryonic otolith chemistry did not vary consistently with salinity. Temperature differs consistently between rearing habitats and, thus, these findings suggest that when capelin rearing habitats differ by ≥4 °C within a year, chemical signatures in the embryonic otolith may be used to determine the natal origin of individuals. |
Databáze: | OpenAIRE |
Externí odkaz: |