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Title: Temporal patterns of the catadromous thinlip grey mullet migration in freshwater
Authors: Pereira, Esmeralda
Quintella, Bernardo R.
Lança, Maria João
Alexandre, Carlos M.
Mateus, Catarina S.
Pedro, Sílvia
Belo, Ana Filipa
Rato, Ana
Quadrado, Maria Felisbina
Batista, Carlos
Telhado, Ana
Almeida, Pedro R.
Issue Date: 2021
Publisher: Ecohydrology
Citation: Pereira E., Quintella B.R., Lança M. J., Alexandre C.M., MATEUS C.S., Pedro S., Belo A., Rato A., Quadrado M., Batista C., Telhado A., Almeida P. R. (2021). Temporal patterns of the catadromous thinlip grey mullet migration in freshwater. Ecohydrology. e2345.
Abstract: The thinlip grey mullet (Chelon ramada Risso, 1827) is a catadromous fish that performs massive migrations to freshwater habitats for feeding purposes that can assume a structuring role on riverine ecology due to the biomass involved in these movements. Seasonal movements of thinlip grey mullet through a vertical slot fish pass located in River Mondego (Portugal) were continuously monitored between 2013 and 2017. The extent of trophic migration, population size structure, biomass and the environmental triggers of bi-directional species' migratory activity were analysed. Between March and November of 2013/2014, ~2 million and 1 million movements were respectively recorded. From a subsampling approach, the upstream movements between 2015 and 2017 were estimated. Annually, around five hundred thousand upstream movements can occur to provide species access to the upstream freshwater reaches. Movements are exclusively diurnal, and the population composed by young adults in their first year of maturity, yet juveniles and larger fish were present (TL range: 90–540 mm). Upstream movements increased with temperatures above 15°C, reaching a peak at around 20°C coupled with a photoperiod of 15 h. Downstream movements attained the higher rates when temperature dropped from 22°C to 20°C and photoperiod to 13 h. However, under wetter hydrological conditions (as in 2014), discharge flows have a higher influence. These finding provide unique information regarding species migration to freshwater habitats in the Atlantic coast, namely the extended periods spent in such environments, overlapping with the spawning migration period. Additionally, highlights the importance of species' trophic migration both for its life cycle and riverine food-web.
Type: article
Appears in Collections:BIO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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