Long-term changes in population dynamics and life history contribute to explain the resilience of a stock of Micropogonias furnieri (Sciaenidae, Teleostei) in the SW Atlantic
Introduction
High fishing intensity across the world has altered the dynamics and underlying biological compositions of many marine fish populations (Myers et al., 1995; Audzijonyte et al., 2016). Understanding these changes in relation to life history variability is important when specifying stock assessment models that inform decisions supporting sustainable fisheries management (Longhurst, 2010).
Changes in the population structure due to high fishing intensity reduce fish population capacity to withstand environmental variability and increases the risk of fishery economic collapse (Marteinsdottir and Thorarinsson, 1998; Rouyer et al., 2012). By introducing additional mortality, many fisheries have truncated the age structure of marine fish populations and increased the relative abundance of younger age classes (Berkeley et al., 2004; Hsieh et al., 2010). Commonly, younger and smaller fish contribute less to overall recruitment than the older and larger ones (Palumbi, 2004; Hixon et al., 2014).
Evidence is accumulating that many marine fishes may undergo rapid changes in life-history traits, such as reproduction and growth. These changes have been attributed to fisheries-induced density-dependent factors, environmental drivers and/or evolutionary selective pressures (Audzijonyte et al., 2013; Morrongiello and Thresher, 2015). The relative importance of these drivers have been intensely debated (e.g., Olsen et al., 2004; Marshall and Browman, 2007; Kraak, 2007; Rogers et al., 2011; Therkildsen et al., 2013). However, regardless of the underlying mechanisms, the resulting trends have important implications for the assessment and management of individual species, as well as for ecosystem-based management (Audzijonyte et al., 2016). Understanding the relative importance of how genotypic (i.e., a set of genes an individual carries) and phenotypic (i.e., observable characteristics of an individual resulting from the interaction of its genotype with the environment) variability alters the population dynamics of intensely exploited marine fishes requires a long time series of data. Here we consider changes in expressed life history values of a sciaenid fish given its fishing history.
Marine sciaenid fishes are cosmopolitan (i.e., from tropical to temperate soft-bottom continental shelves) and widely important to fisheries worldwide. They are usually associated with large freshwater inputs, including the subtropical and warm temperate southwestern Atlantic Ocean (Longhurst and Pauly, 1987; Lowe-McConnell, 1987). Despite their importance and wide distribution, long-term studies on the population dynamics of sciaenid fishes are not frequent in the literature. For example, a comprehensive data set used by Keith and Hutchings (2012) to analyse fish population dynamics in low abundance included 204 stocks of 103 species, among which only one was a sciaenid (Micropogonias undulatus).
Along the extensive continental shelf of Southern Brazil (∼ width 100−200 km), sciaenids are dominant in the demersal fish communities and fisheries, among which M. furnieri (Desmarest, 1823) is the most common (Martins and Haimovici, 2016; Haimovici and Cardoso, 2017). This species is a euryhaline demersal sciaenid fish associated with soft bottoms in coastal and estuarine regions from the Yucatán Peninsula, in southeastern Mexico down to northern Patagonia (Chao, 1981). M. furnieri is an important component of the coastal fish community and the main target of the demersal coastal fisheries from Rio de Janeiro State in Brazil to Bahia Blanca in Argentina (23ᵒS - 40ᵒS) (Chiesa et al., 2006; Carozza, 2010; Haimovici et al., 2016). Annual landings in Argentina, Uruguay and Brazil have reached over 100,000 tons in recent years (FAO, 2018). In southern Brazil, the M. furnieri has been fished in the Patos Lagoon Estuary and in coastal waters since the 19th century by small-scale fishers with gillnets and beach seine nets (Odebrecht, 2003). Industrial fishing using otter and pair trawls began fishing on the continental shelf in the late 1940s in this region (Yesaki and Bager, 1975) and intensified from the mid-1970s when restrictions on economic exclusive zones excluded Brazilian fishing boats from fishing off Uruguay and Argentina continental shelves (Haimovici et al., 2014).
Although M. furnieri has a continuous distribution in the SW Atlantic, recent studies on the genetic population structure, spawning season, and growth suggest limited connectivity among the stocks fished in southern Brazil from those in southeastern Brazil to the north and in the Common Fishery Zone of Argentina and Uruguay to the south (Vasconcellos et al., 2015; Haimovici et al., 2016). In southern Brazil, the biology and population dynamics of M. furnieri have been studied since the 1970s (Vazzoler, 1991) because of its high abundance and economic importance, with industrial landings regularly monitored and sampled since 1976 in the town of Rio Grande (Haimovici, 1987). In this region, this species is considered to be overfished since the 1980s (Haimovici, 1998), with a fishing mortality (F) between 2–6 times higher than the calculated fishing mortality at maximum sustainable yield (FMSY) based on a surplus production model (Vasconcellos and Haimovici, 2006). However, despite low abundance compared to historical levels, this species still represents the main target of coastal demersal fishing in southern Brazil (Haimovici et al., 2016; Haimovici and Cardoso, 2017).
M. furnieri is a mid-sized (650 mm average maximum size) and long-lived (at least 38 years) fish (Schwingel and Castello, 1990; Haimovici and Unpierre, 1996). In the SW Atlantic, it is a seasonal spawner in coastal or estuarine waters (Weiss, 1981; Vazzoler, 1991; Macchi et al., 2003; Militelli et al., 2013). Pelagic eggs and larvae are carried into estuaries and coastal lagoons or retained in brackish waters where juveniles develop (Costa et al., 2013; Acha et al., 2018). Adults are opportunistic bottom-feeders that prey mainly on benthic infauna and epifauna such as polychaetas, mollusks, crustaceans and fish (Sánchez et al., 1991; Martins and Haimovici, 2020).
In this study, we aim to understand how four decades of heavy industrial fishing has affected life history values and population dynamics of M. furnieri and how this species has managed to stave off total collapse despite this intense removal pressure. In order to do so, we analyzed the long-term changes in growth, age and size at maturity, age and size structure, mortality and the reproductive potential of the stock of M. furnieri fished along southern Brazil between 1976 and 2017. Throughout this period, we observed that the truncation of age structure has decreased the reproductive potential for this stock. As a compensatory response to the reduction in density, growth increased and the age at first maturity of females decreased. In the last two decades, the age structure and growth have stabilized. We discuss the capacity of M. furnieri to withstand intense fishing into the future in the light of the realized changes in life history and subsequent population dynamics. The erosion of resilience due to the drastic decrease in the spawning potential highlights the potential risk of commercial collapse of the stock due to declining population size and recent technological improvements in fishing.
Section snippets
Material and methods
The primary dataset comes from a sampling program of the industrial fishing landings in Rio Grande from 1976 to 2019, and complemented by occasional bottom trawl surveys along southern Brazil (Haimovici, 1987; Haimovici et al., 1996). The periods used for each analysis were defined by data availability (Table 1).
In the multi-species coastal industrial bottom trawl and gillnet fisheries, fish are stored on board with ice in holds without previous size classification, therefore sampling for
Growth changes
The mean total length- and weight-at-age for both sexes of M. furnieri were calculated for the five periods with available data. Mean total length-at-age increased sharply between the first and the third period and stabilized during the following two periods (Fig. 2a). The changes become more evident when considering weight-at-age for ages greater than three (Fig. 2b):
The “multiple period” model (DIC = 36,982 for females and 27,117 for males) was better supported by the data than the “single
Discussion
Changes in the population structure and dynamics have been recorded for many fish stocks around the world as a response to heavy fishery exploitation (e.g., Bianchi et al., 2000; Sharpe and Hendry, 2009; Audzijonyte et al., 2013, 2016). The erosion of the size and age structure, the gradual increase in the total mortality and exploitation rates, and the low stock size in current years, as observed for M. furnieri in southern Brazil, are all indicators of population decline. These trends are
CRediT authorship contribution statement
Manuel Haimovici: Conceptualization, Methodology, Writing - original draft. Leticia Maria Cavole: Investigation, Formal analysis, Writing - original draft. Jason M. Cope: Formal analysis, Writing - original draft. Luís Gustavo Cardoso: Formal analysis, Writing - original draft, Software.
Declaration of Competing Interest
The authors report no declarations of interest.
Acknowledgements
The authors thank the Federal University of Rio Grande - FURG that provided continuous support, and the technicians and students who made possible the samplings and processing of the data along the years required in this long-term study. M.H. is Senior research fellow (307994/2020-1) and L. C. received a scholarship (132469/2012-0) from the Brazilian National Scientific and Technological Research Council. We also thank the anonymous reviewers and the editor for their useful recommendations.
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