Details:

Journal Title:
Limnology and Oceanography
Personal Author:
Romero‐Romero, Sonia ; Choy, C. Anela ; Hannides, Cecelia C. S. ; Popp, Brian N. ; Drazen, Jeffrey C.
Romero‐Romero, Sonia ; Choy, C. Anela ; Hannides, Cecelia C. S. ; Popp, Brian N. ; Drazen, Jeffrey C. Less -
NOAA Program & Office:
JIMAR (Joint Institute for Marine and Atmospheric Research)
Description:
Many species of micronekton perform diel vertical migrations (DVMs), which ultimately contributes to carbon export to the deep sea. However, not all micronekton species perform DVM, and the nonmigrators, which are often understudied, have different energetic requirements that might be reflected in their trophic ecology. We analyze bulk tissue and whole animal stable nitrogen isotopic compositions (δ15N values) of micronekton species collected seasonally between 0 and 1250 m depth to explore differences in the trophic ecology of vertically migrating and nonmigrating micronekton in the central North Pacific. Nonmigrating species exhibit depth‐related increases in δ15N values mirroring their main prey, zooplankton. Higher variance in δ15N values of bathypelagic species points to the increasing reliance of deeper dwelling micronekton on microbially reworked, very small suspended particles. Migrators have higher δ15N values than nonmigrators inhabiting the epipelagic zone, suggesting the consumption of material during the day at depth, not only at night when they migrate closer to the surface. Migrating species also appear to eat larger prey and exhibit a higher range of variation in δ15N values seasonally than nonmigrators, likely because of their higher energy needs. The dependence on material at depth enriched in 15N relative to surface particles is higher in migratory fish that ascend only to the lower epipelagic zone. Our results confirm that stark differences in the food habits and dietary sources of micronekton species are driven by vertical migrations.
Keywords:
[+]
Distribution Micronekton
Source:
Limnol Oceanogr. 2019 Jul; 64(4): 1473–1483.
DOI:
https://doi.org/10.1002/lno.11128
Pubmed ID:
31598007
Pubmed Central ID:
PMC6774321
Document Type:
Journal Article
Funding:
Grant no. NA09OAR4320075
Rights Information:
CC BY
Compliance:
PMC
Main Document Checksum:
[+]
urn:sha256:848f5b1e8a457e6fc618e93f12ff29992611927da51ff95aba42a6630b36b652
Download URL:
https://repository.library.noaa.gov/view/noaa/26287/noaa_26287_DS1.pdf
File Type:

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