Quantifying exchanges of Allis shads between river catchments by combining otolith microchemistry and abundance indices in a Bayesian model

Randon, Marine; Daverat, Françoise; Bareille, Gilles; Jatteau, Philippe; Martin, Jean; Pécheyran, Christophe; Drouineau, Hilaire

doi:10.1093/icesjms/fsx148

Cited by 12 publications

(30 citation statements)

References 52 publications

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“…The presence of subadults in marine habitats connected to an estuary would suggest that fishes stay close to their natal river basin (Taverny 1991;Taverny and Elie 2001). Recent studies that have revealed that Allis shad formed a meta-population where exchanges of adults primarily occurred between neighbouring rivers (Martin et al 2015;Randon et al 2018), would support this hypothesis.…”

Section: Rmentioning

confidence: 98%

“…Thus, the unique properties of these calcified pair structures make them especially useful to unravel the life-history features and movement patterns of diadromous fishes at fine spatial scales, such as dispersal capacities, patterns of population connectivity and natal origin of fish (Daverat et al 2011;Nachón 2017;Randon et al 2018). Anadromous fishes are often caught as bycatch in coastal fisheries, particularly shads because of their school-forming behaviour (Taverny and Elie 2001;Hasselman et al 2015;Nachón et al 2016).…”

Section: R a F T Introductionmentioning

confidence: 99%

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1980s population-specific compositions of two related anadromous shad species during the oceanic phase determined by microchemistry of archived otoliths

Nachón

Bareille

Drouineau

et al. 2020

Can. J. Fish. Aquat. Sci.

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The specific stock composition and dispersion of anadromous fish species aggregations in the marine environment are poorly known, while they can play a major role in the metapopulation dynamics. Otolith microchemistry has proven to be a powerful tool to address natal origins of anadromous fish. We used archived otolith microchemistry to investigate the population-specific composition of subadult European shads (Alosa alosa and Alosa fallax) in the ocean during the 1980s. The allocation of natal origin was addressed relying on contemporary water and juveniles’ signatures within a Bayesian model. A great discrimination of natal origin was obtained at the Biscay Gulf scale. However, the discrimination of 1980s natal origin for the southern rivers with similar geology based on 2013 water and juveniles’ baselines was doubtful. Our results showed that the most abundant southern populations were dominant, suggesting that population-specific composition was related to population relative abundance. The dispersion in the marine environment was plastic; alternatively, shads were found large distances away from their natal rivers, while others remained in the vicinity of their natal river plume.

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Section: Rmentioning

confidence: 98%

Section: R a F T Introductionmentioning

confidence: 99%

1980s population-specific compositions of two related anadromous shad species during the oceanic phase determined by microchemistry of archived otoliths

Nachón

Bareille

Drouineau

et al. 2020

Can. J. Fish. Aquat. Sci.

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“…During this swim, the spawners thrash their caudal fins on the water surface, producing a loud sound that is between 35 and 50 dB (Cassou-Leins, Cassou-Leins, Boisneau, & Bagliniere, 2000), which are recorded for surveys measuring spawning events on sites in rivers (Gaillagot & Carry, 2016). A metapopulation dynamic was revealed in these two adjoining rivers (Randon et al, 2017).…”

Section: Introductionmentioning

confidence: 94%

“…Aggregation was considered because the rivers have similar hydrological regimes and their shad populations are linked in metapopulation dynamics (Randon et al, 2017) 2017). Niche overlap was computed using the D metric (Warren, Glor, & Turelli, 2008), which varied from 0 (no overlap) to 1 (complete overlap).…”

Section: Data Aggregation Test From the Two Riversmentioning

confidence: 99%

“…In the French shad population, the adults spend 5 years in the ocean and return to rivers to reproduce before dying (Lambert, Martin Vandembulcke, Rochard, Bellariva, & Castelnaud, 2001;McDowall, 1988). A metapopulation dynamic was revealed in these two adjoining rivers (Randon et al, 2017). Spawners reproduce at night, with a peak in reproduction at 03.00 (Cassou-Leins, 1981;Menneson-Boisneau & Boisneau, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Assessing the relative importance of temperature, discharge, and day length on the reproduction of an anadromous fish (Alosa alosa)

et al. 2019

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Climate change threatens anadromous fishes such as the allis shad (Alosa alosa)populations of which have declined since the 20th century in Europe. Sensitivity to climate change could be quantified by determining the fish's spawning behaviour, defined as the timing of reproduction (i.e. spawning events) as a function of temporally variable environmental factors. The cues that fish use to time reproduction could determine their response to climate change.2. A machine learning technique (boosted regression tree) was calibrated using a 14-year dataset composed of daily measures of environmental factors and fish occurrences during reproduction. The boosted regression tree provides complete insight into the complex relationship between the spawning probability, i.e. the probability for a fish to reproduce, and environmental factors that might evolve with climate change.3. The spawning probability was positively related to day length (44.6%) and water temperature (34.7%) and negatively related to river discharge (20.7%). Optimal reproductive conditions corresponded to a difference in day length between 0 and 0.04 hr, a water temperature between 15 and 26°C and a river discharge between 55 and 665 m 3 /s; these conditions are currently being utilised by allis shad populations in the Garonne and Dordogne rivers, France.4. This study highlights the relative influence of environmental factors on the observed spawning period as well as the evolution of habitat suitability during the 14-year period. The novelty of this study stems from assessing population process data, i.e. the occurrence of fish reproduction, rather than mere occurrence data in an ecological niche model study. Climate change may lead to a shift in spawning phenology, as the water temperature and river discharge will also change. Therefore, conservation plans need to integrate these effects on spawning grounds. K E Y W O R D Sboosted regression tree, climate change, ecological niche, ecospat, migratory fish How to cite this article: Paumier A, Drouineau H, Boutry S, Sillero N, Lambert P. Assessing the relative importance of temperature, discharge, and day length on the reproduction of an anadromous fish (Alosa alosa). Freshwater Biology.

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A field-based definition of the thermal preference during spawning for allis shad populations (Alosa alosa)

Paumier

Drouineau

Carry³

et al. 2019

Environ Biol Fish

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Quantifying exchanges of Allis shads between river catchments by combining otolith microchemistry and abundance indices in a Bayesian model

Cited by 12 publications

References 52 publications

1980s population-specific compositions of two related anadromous shad species during the oceanic phase determined by microchemistry of archived otoliths

1980s population-specific compositions of two related anadromous shad species during the oceanic phase determined by microchemistry of archived otoliths

Assessing the relative importance of temperature, discharge, and day length on the reproduction of an anadromous fish (Alosa alosa)

A field-based definition of the thermal preference during spawning for allis shad populations (Alosa alosa)

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