Assessing reproductive resilience: an example with South Atlantic red snapper Lutjanus campechanus

Lowerre‐Barbieri, Susan K.; Crabtree, Laura; Switzer, Theodore S.; Burnsed, Sarah Walters; Guenther, Cameron B.

doi:10.3354/meps11212

Cited by 37 publications

(66 citation statements)

References 66 publications

(61 reference statements)

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“…Through the recovery process, close monitoring of changes in stock production and indicators thereof, including life history, demography and reproductive potential, serve to provide fishery managers with crucial new information for better understanding the resilience of a population as well as refine forecasts and oversight of its recovery [1, 78]. …”

Section: Discussionmentioning

confidence: 99%

Temporal and spatial comparisons of the reproductive biology of northern Gulf of Mexico (USA) red snapper (Lutjanus campechanus) collected a decade apart

2017

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In studies done a decade apart, we provide evidence of a recent shift toward a slower progression to sexual maturity as well as reduced egg production, especially among young, small female red snapper, in the Gulf of Mexico (Gulf). Slower maturation rates (among fish ≤6 years old), lower GSI values and decreased spawning frequency were observed, and were especially pronounced in the northwestern Gulf. Furthermore, an Index of Reproductive Importance showed that young fish (ages 2–7) are contributing far less to the spawning stock in recent years, while older fish (>8 years) are contributing more, when compared to fish from the same age groups sampled in the previous decade. Coincident with these changes in reproductive output, fishing pressure has steadily declined gulf-wide, and spawning stock biomass and spawning potential ratio have increased. Thus, it is possible that the age structure of the red snapper stock is becoming less truncated, or that reproductive effort observed is due to the temporary influence of recent strong year classes produced in 2004 and 2006 as they begin to reach full reproductive potential. If the latter is true, careful documentation of the stock’s reproductive dynamics during a time of population growth provides new understanding at the meta-population spatial and decadal temporal scales. In contrast, if the former is true, a truncated age structure due to overharvest can limit the productivity of the Gulf red snapper stock. In addition, we have learned that red snapper females in the northwestern Gulf collected on natural reefs and banks have much higher reproductive output than those on artificial reefs in the form of standing and toppled oil and gas platforms, thus making the need to know the relative abundance of females found on these disparate habitats an important next step toward better-understanding factors impacting the reproductive dynamics of this species.

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Section: Discussionmentioning

confidence: 99%

Temporal and spatial comparisons of the reproductive biology of northern Gulf of Mexico (USA) red snapper (Lutjanus campechanus) collected a decade apart

2017

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“…Oocyte recruitment patterns can be defined based on the quantity and timing of recruitment events from oogonia to primary growth, from primary to SG and from SG to oocyte maturation (Figure ). Recruitment to primary growth is responsible for populating the ovary with primary growth oocytes which are seldom taken into account in applied fisheries reproductive biology (Kjesbu, ) although they clearly play a role in the process of sexual maturation (Lowerre‐Barbieri, Crabtree, Switzer, Burnsed, & Guenther, ). Recruitment to oocyte maturation is indicative of an individual's commitment to an imminent spawning event.…”

Section: Temporal Dynamics Of Oocyte Recruitment and Oocyte Growthmentioning

confidence: 99%

Oocyte recruitment and fecundity type in fishes: Refining terms to reflect underlying processes and drivers

Ganias

Lowerre‐Barbieri

2018

Fish and Fisheries

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Only with new technology and the ability to simulate systems are we beginning to understand fish reproductive processes at the individual scale over time. Traditionally, oocyte recruitment and fecundity type in fishes have been based on a “snapshot” approach, that is a histological micrograph and/or oocyte size frequency distribution of a spawning capable female has been assumed to indicate oocyte recruitment processes over time. This has important implications as the asynchronous and group‐synchronous oocyte recruitment patterns are associated with indeterminate and determinate fecundity types, respectively, and thus affect estimates of reproductive potential and spawning biomass (if using egg production methods). However, a historic review of these terms revealed that they are not applied consistently, with the same oocyte recruitment pattern often assigned to both of these by different scientists. The intent of this study is to develop a conceptual model of oocyte recruitment processes over time, key drivers, and resulting “snapshots” to refine oocyte recruitment terms, definitions, and the methods needed to identify them.

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“…, Lowerre‐Barbieri et al. ). Yet what drives spawning site selection is rarely understood (Sadovy et al.…”

Section: Discussionmentioning

confidence: 99%

“…However, highly fecund marine fish typically exhibit poor stock–recruitment relationships, and there is growing awareness that factors in addition to the abundance of mature females and fecundity affect reproductive success (Lowerre‐Barbieri et al. ). Most marine fish species exhibit some level of breeding population isolation, and this isolation and dispersal amongst sub‐populations plays an important role in stock productivity (Spies et al.…”

Section: Introductionmentioning

confidence: 99%

Assessing reproductive behavior important to fisheries management: a case study with red drum, Sciaenops ocellatus

Lowerre‐Barbieri

Burnsed

Bickford

2016

Ecological Applications

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Spawning site selection and reproductive timing affect stock productivity and structure in marine fishes but are poorly understood. Traditionally, stock assessments measure reproductive potential as spawning stock biomass or egg production and do not include other aspects of reproductive behavior. Red drum make an excellent case study to assess these other aspects, as (1) they are highly fecund, pelagic spawners, like most exploited marine fishes; (2) their life cycle is delineated between nursery (estuarine) and adult (coastal and offshore) habitat; and (3) they are managed at these two spatial scales. This study was conducted from August 2012 to December 2013 and integrates data from multiple methods and spatial scales. Aerial surveys were used for large-scale monitoring of aggregations off two known estuarine nursery areas, Tampa Bay and Charlotte Harbor, Florida, USA. Capture-based sampling in Tampa Bay coastal (n = 2581) and estuarine waters (n = 158) was used to assess reproductive state and to confirm coastal spawning. To assess spatial dynamics, we acoustically tagged two population components in the Tampa Bay system, subadults from the estuary (n = 20) and adults from the coastal spawning site (n = 60). Behavioral plasticity was seen in subadult recruitment to coastal habitat, with some subadults maturing and recruiting before or during the spawning season and others (14 of 20 acoustically tagged fish) recruiting at the end of the 2012 spawning season. Both adults and recruited subadults (n = 29) were consequently detected in the Charlotte Harbor array, 132 km to the south. Spawning-site fidelity to the Tampa Bay spawning site occurred at both the population and individual scales. Aggregations consistently occurred in Tampa Bay coastal waters during the spawning season, and approximately two-thirds of tagged adults returned in the 2013 spawning season. A similar proportion of subadults returned to the Tampa Bay spawning site, exhibiting natal homing. However, these first-time spawners arrived later than repeat spawners and were detected over shorter time periods. This study, and others like it, demonstrates how integrating data from individuals tracked over space and time with more traditional population-based sampling is changing our understanding of ecological processes that affect marine fish productivity and our ability to manage for sustainablity.

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Assessing reproductive resilience: an example with South Atlantic red snapper Lutjanus campechanus

Cited by 37 publications

References 66 publications

Temporal and spatial comparisons of the reproductive biology of northern Gulf of Mexico (USA) red snapper (Lutjanus campechanus) collected a decade apart

Temporal and spatial comparisons of the reproductive biology of northern Gulf of Mexico (USA) red snapper (Lutjanus campechanus) collected a decade apart

Oocyte recruitment and fecundity type in fishes: Refining terms to reflect underlying processes and drivers

Assessing reproductive behavior important to fisheries management: a case study with red drum, Sciaenops ocellatus

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