Impact of temperature on Downs herring (Clupea harengus) embryonic stages: First insights from an experimental approach

Type Article
Date 2023-04
Language English
Author(s) Toomey LolaORCID1, Giraldo CarolinaORCID1, Loots ChristopheORCID1, Mahé KeligORCID1, Marchal PaulORCID1, Mackenzie KirsteenORCID1
Affiliation(s) 1 : IFREMER, Channel and North Sea Fisheries Research Unit, Boulogne-sur-Mer, France
Source Plos One (1932-6203) (Public Library of Science (PLoS)), 2023-04 , Vol. 18 , N. 4 , P. e0284125 (28p.)
DOI 10.1371/journal.pone.0284125
WOS© Times Cited 2

Among all human-induced pressures, ocean warming is expected to be one of the major drivers of change in marine ecosystems. Fish species are particularly vulnerable during embryogenesis. Here, the impact of temperature was assessed on embryonic stages of Atlantic herring (Clupea harengus), a species of high socio-economic interest, with a particular focus on the under-studied eastern English Channel winter-spawning component (Downs herring). Key traits linked to growth and development were experimentally evaluated at three temperatures (8°C, 10°C and 14°C), from fertilization to hatching, in standardized controlled conditions. Overall negative impacts of increased temperature were observed on fertilization rate, mean egg diameter at eyed stage, hatching rate and yolk sac volume. A faster developmental rate and a change in development stage frequency of newly hatched larvae were also observed at higher temperature. Potential parental effects were detected for four key traits (i.e. fertilization rate, eyed survival rate, mean egg diameter and hatching rate), despite a limited number of families. For instance, a large variability among families was shown in survival rate at eyed stage (between 0 and 63%). Potential relationships between maternal characteristics and embryo traits were therefore explored. We show that a substantial proportion of variance (between 31 and 70%) could be explained by the female attributes considered. More particularly, age, traits linked to life history (i.e. asymptotic average length and Brody growth rate coefficient), condition and length were important predictors of embryonic key traits. Overall, this study constitutes a stepping-stone to investigate potential consequences of warming on Downs herring recruitment and provides first insights on potential parental effects.

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Publisher's official version 28 1 MB Open access
S1 Fig. Temperature recorded from a Marel Carnot buoy (code 6200443) in front of Boulogne-sur-Mer between mid-November 2021 and mid-January 2022 (Coriolis data; Lefebvre, 2015). 1 201 KB Open access
S2 Fig. Experimental set-up. 1 1 MB Open access
S3 Fig. Morphological characteristics from pools of males (n = 3 per pool) used for the fertilization of eggs from the different females. 1 322 KB Open access
S4 Fig. Boxplots of fertilization rate across the different families. 1 168 KB Open access
S5 Fig. Correlation plot of female attributes. 1 234 KB Open access
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