Improved viability of populations with diverse life-history portfolios

Greene, Correigh M.; Hall, Jason E.; Guilbault, Kimberly R.; Quinn, Thomas P.

doi:10.1098/rsbl.2009.0780

Cited by 142 publications

(179 citation statements)

References 15 publications

(15 reference statements)

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“…groups of individuals within the same stock exhibiting different patterns of migration, are part of the life-history portfolio of a species (Greene et al 2010, Schindler et al 2010), yet very little information exists on their consequences for the conservation of exploited marine resources. Behavioural effects on vulnerability to harvest have only been recently investigated (Biro & Post 2008), and revealed that more active and bold fish, for example migratory fish, are likely to be more vulnerable to harvest than sedentary fish (Biro & Post 2008).…”

Section: Discussionmentioning

confidence: 99%

Consistency in the behaviour types of the Atlantic cod: repeatability, timing of migration and geo-location

Þorsteinsson¹,

Pálsson²,

Tómasson³

et al. 2012

Mar. Ecol. Prog. Ser.

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We investigated the behaviour patterns of coastal (relatively stationary in shallow waters) and migratory frontal (offshore) types of Atlantic cod Gadus morhua in Icelandic waters using information from data storage tags (DSTs). Consistent and repeated patterns of migration were observed for both coastal and frontal cod, with characteristic DST profiles repeated from year to year. The migration timing in 2 successive years was close to being synchronous, suggesting that the onset of migration was consistent from year to year. A tidal location model suggested that the feeding migrations of cod in Icelandic waters were undertaken in groups or shoals during the whole year. The overall stability of the behaviour patterns of both types suggests that coastal and frontal individuals use different behavioural strategies which might either be related to food availability/ competition or genetic control.

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Section: Discussionmentioning

confidence: 99%

Consistency in the behaviour types of the Atlantic cod: repeatability, timing of migration and geo-location

Þorsteinsson¹,

Pálsson²,

Tómasson³

et al. 2012

Mar. Ecol. Prog. Ser.

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“…Spawning-age variation reduces the probability of all individuals in a cohort suffering as a consequence of the same temporary environmental conditions [81,82]. The population growth rate and life-history variation appear to be positively correlated in the long term, even though they may be inversely connected over short time periods [81].…”

Section: The Effect Of Hatchery Rearing On the Spawning Agementioning

confidence: 99%

Spawning-Age Differences and their Temporal Trends in Wild and Sea-Ranched Atlantic Salmon Stocks, from Stock Mixture Data

Kallio‐Nyberg¹,

Koljonen²,

Saloniemi³

2014

TOFISHSJ

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Origin and age was determined for individual fish caught in offshore catches of Atlantic salmon stocks (Salmo salar L.) in the Baltic Sea over the years [2000][2001][2002][2003][2004][2005][2006][2007][2008][2009]. DNA microsatellite loci and smolt age were used to probabilistically assign returning spawners to their stock of origin. Data for this study were based on approximately 2600 catch samples of the five most common wild and four sea-ranched, hatchery-reared stocks. Spawning age, and sex ratio differed both within and between these wild, and sea-ranched groups. The females were mainly (78.7%) two sea-winters old and the males usually (68.7%) only one sea-winter old. In both sexes, the mean age at maturity was lower in the hatchery-reared, sea-ranched stocks than in naturally reproducing stocks. In the 2000s, there was a weak decreasing trend in the male spawning age, but not in that of females. The sex-ratio of the spawners was female dominant in the naturally reproducing stocks, but male dominant in hatchery-reared stocks. Published historical data from two of the same rivers suggest that the majority of males were multi-sea-winter spawners in the 1930s, and variation in the age distribution of the spawners has become narrower and skewed towards a younger age in the present data (2000-2009) compared to the earlier situation.

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“…Many salmonid stocks are thought to be buffered from demographic stochasticity through risk being spread across different cohorts that can mature and spawn in mixed-age classes (Greene et al 2010;). In addition, the presence of a significant number of age-4 spawners could positively influence SRWRC productivity through increases in fecundity common to larger females (Beacham and Murray 1993).…”

Section: Application Examplesmentioning

confidence: 99%

Science Advancements Key to Increasing Management Value of Life Stage Monitoring Networks for Endangered Sacramento River Winter-Run Chinook Salmon in California

Johnson¹,

Windell²,

Brandes³

et al. 2017

SFEWS

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A robust monitoring network that provides quantitative information about the status of imperiled species at key life stages and geographic locations over time is fundamental for sustainable management of fisheries resources. For anadromous species, management actions in one geographic domain can substantially affect abundance of subsequent life stages that span broad geographic regions. Quantitative metrics (e.g., abundance, movement, survival, life history diversity, and condition) at multiple life stages are needed to inform how management actions (e.g., hatcheries, harvest, hydrology, and habitat restoration) influence salmon population dynamics. The existing monitoring network for endangered Sacramento River winterrun Chinook Salmon (SRWRC, Oncorhynchus tshawytscha) in California's Central Valley was compared to conceptual models developed for each life stage and geographic region of the life cycle to identify relevant SRWRC metrics. We concluded that the current monitoring network was insufficient to diagnose when (life stage) and where (geographic domain) chronic or episodic reductions in SRWRC cohorts occur, precluding within-and among-year comparisons. The strongest quantitative data exist in the Upper Sacramento River, where abundance estimates are generated for adult spawners and emigrating juveniles. However, once SRWRC leave the upper river, our knowledge of their identity,

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Improved viability of populations with diverse life-history portfolios

Cited by 142 publications

References 15 publications

Consistency in the behaviour types of the Atlantic cod: repeatability, timing of migration and geo-location

Consistency in the behaviour types of the Atlantic cod: repeatability, timing of migration and geo-location

Spawning-Age Differences and their Temporal Trends in Wild and Sea-Ranched Atlantic Salmon Stocks, from Stock Mixture Data

Science Advancements Key to Increasing Management Value of Life Stage Monitoring Networks for Endangered Sacramento River Winter-Run Chinook Salmon in California

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