TY - JOUR

T1 - Tracing the Food Web of Changing Arctic Ocean: Trophic Status of Highly Abundant Fish, Gasterosteus aculeatus (L.), in the White Sea Recovered Using Stomach Content and Stable Isotope Analyses

AU - Генельт-Яновская, Анна Сергеевна

AU - Полякова, Наталия

AU - Иванов, Михаил Валерьевич

AU - Надточий, Екатерина Викторовна

AU - Иванова, Татьяна Сослановна

AU - Генельт-Яновский, Евгений Александрович

AU - Тиунов, Алексей

AU - Лайус, Дмитрий Людвигович

N1 - Publisher Copyright: © 2022 by the authors.

PY - 2022/11/6

Y1 - 2022/11/6

N2 - Studies of dietary preferences of migratory species are of great importance as these species connect food webs of habitats across the migration route and thus represent trophic relationships between the spatially disjointed communities. Here we described the dietary preferences of threespine stickleback G. aculeatus in the White Sea during the spawning season using stable isotope and stomach content analyses. The two analyses suggested that during the spawning season, when sticklebacks spend the majority of their time inshore, their diet consists mostly of benthic species, while at the beginning of the spawning season when fish migrating from the offshore were feeding on plankton. Additionally, we demonstrated that stickleback eggs contributed greatly to the diet of both male and female fish. Using Bayesian mixing modeling, we showed that dietary preferences in females were broader than in males, and more variable during the spawning season. While guarding their nests, males fed almost exclusively on eggs. Both stomach contents and isotope signatures demonstrate that by the end of the spawning season sticklebacks again increase the consumption of plankton. Isotope analysis proved to be a more reliable tool to trace this change than stomach content analysis. Our results show that stable isotope and stomach content analyses are complementary in understanding seasonal changes in the dietary composition of stickleback.

AB - Studies of dietary preferences of migratory species are of great importance as these species connect food webs of habitats across the migration route and thus represent trophic relationships between the spatially disjointed communities. Here we described the dietary preferences of threespine stickleback G. aculeatus in the White Sea during the spawning season using stable isotope and stomach content analyses. The two analyses suggested that during the spawning season, when sticklebacks spend the majority of their time inshore, their diet consists mostly of benthic species, while at the beginning of the spawning season when fish migrating from the offshore were feeding on plankton. Additionally, we demonstrated that stickleback eggs contributed greatly to the diet of both male and female fish. Using Bayesian mixing modeling, we showed that dietary preferences in females were broader than in males, and more variable during the spawning season. While guarding their nests, males fed almost exclusively on eggs. Both stomach contents and isotope signatures demonstrate that by the end of the spawning season sticklebacks again increase the consumption of plankton. Isotope analysis proved to be a more reliable tool to trace this change than stomach content analysis. Our results show that stable isotope and stomach content analyses are complementary in understanding seasonal changes in the dietary composition of stickleback.

KW - threespine stickleback

KW - Gasterosteus aculeatus

KW - stomach content analysis

KW - stable isotope analysis

KW - fish diet

KW - the White Sea

KW - boreal fish

KW - Subarctic

KW - boreal fish

KW - fish diet

KW - Gasterosteus aculeatus

KW - stable isotope analysis

KW - stomach content analysis

KW - Subarctic

KW - the White Sea

KW - threespine stickleback

UR - http://www.scopus.com/inward/record.url?scp=85141659246&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/807bb90f-8ecf-390e-97bd-32cab6a6265f/

U2 - 10.3390/d14110955

DO - 10.3390/d14110955

M3 - Article

VL - 14

JO - Diversity

JF - Diversity

SN - 1424-2818

IS - 11

M1 - 955

ER -