10.5061/DRYAD.XPNVX0KFP
Thoral, Elisa
Claude Bernard University Lyon 1
Queiros, Quentin
Marine Biodiversity Exploitation and Conservation
Roussel, Damien
0000-0002-8865-5428
Claude Bernard University Lyon 1
Dutto, Gilbert
French Research Institute for Exploitation of the Sea
Gasset, Eric
Marine Biodiversity Exploitation and Conservation
McKenzie, David
Marine Biodiversity Exploitation and Conservation
Romestaing, Caroline
Claude Bernard University Lyon 1
Fromentin, Jean-Marc
Marine Biodiversity Exploitation and Conservation
Saraux, Claire
0000-0001-5061-4009
Hubert Curien Multi-disciplinary Institute
Teulier, Loic
0000-0001-7779-7634
Claude Bernard University Lyon 1
Changes in foraging mode caused by a decline in prey size have major
bioenergetic consequences for a small pelagic fish
Dryad
dataset
2021
Bioenergetics
fish shrinking
food restriction
sardine
2021-05-18T00:00:00Z
2021-05-18T00:00:00Z
en
29904 bytes
6
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Global warming is causing profound modifications of aquatic ecosystems and
one major outcome appears to be a decline in adult size of many fish
species. Over the last decade, sardine populations in the Gulf of Lions
(NW Mediterranean Sea) have shown severe declines in body size and
condition as well as disappearance of the oldest individuals, which could
not be related to overfishing, predation pressure, or epizootic diseases.
In this study, we investigated whether this situation reflects a bottom-up
phenomenon caused by reduced size and availability of prey that could lead
to energetic constraints. We fed captive sardines with food items of two
different sizes eliciting a change in feeding mode (filter-feeding on
small items and directly capturing larger ones) at two different rations
for several months, and then assessed their muscle bioenergetics to test
for changes in cellular function. Feeding on smaller items was associated
with a decline in body condition, even at high ration, and almost
completely inhibited growth by comparison to sardines fed large items at
high ration. Sardines fed on small items presented specific mitochondrial
adjustments for energy sparing, indicating a major bioenergetic challenge.
Moreover, mitochondria from sardines in poor condition had low basal
oxidative activity but high efficiency of ATP production. Notably, when
body condition was below a threshold value of 1.07, close to the mean
observed in the wild, it was directly correlated with basal mitochondrial
activity in muscle. The results show a link between whole-animal condition
and cellular bioenergetics in the sardine, and reveal physiological
consequences of a shift in feeding mode. They demonstrate that
filter-feeding on small prey leads to poor growth, even under abundant
food and an increase in the efficiency of ATP production. These findings
may partially explain the declines in sardine size and condition observed
in the wild.
"Read me" for usage of Data_Changes in foraging mode. Each sheet
contains the data presented in each figure and table of the article. All
the mitochondrial measurements were performed at 20°C. Missing values of
the mitochondrial measurements at the fibre or at the muscle level (Figure
2; Table 2) have been retired when the measurement was more than 2
standard deviations higher than the group average, or when the oxygen
consumption after the addition of cytochrome c was increased by 30% or
more. Missing values of the mitochondrial measurements at the
mitochondrial level (Table 2) are due to omissions during the
measurements. In the tab "Figure 3", the missing values are due
to omissions during the measurements. Specific legends : NA = missing
values Identity refers to the fish tag LI = large items, SI = small items,
LQ = large quantity, SQ = small quantity BCI = Body condition index ETS =
electron transport system ATP/O ratio = ratio between ATP production rate
and oxygen consumption rate