Hatch date distributions of young-of-year haddock Melanogrammus aeglefinus in the Gulf of Maine/ Georges Bank region: implications for recruitment

Lapolla, Amy E.; Buckley, Lawrence J.

doi:10.3354/meps290239

Cited by 24 publications

(38 citation statements)

References 34 publications

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“…With only 1 exception (cod 1997-constant M), the May cohorts of both cod and haddock rapidly lost biomass, despite their rapid growth compared to earlier cohorts. The estimated hatch dates of haddock demersal juveniles on both Georges Bank and the North Sea appear to confirm this finding (Wright & Gibb 2005, Lapolla & Buckley 2005. Interestingly, when Pope et al's (1994) model of growth and mortality in a seasonally perturbed size spectrum was parameterized for North Sea cod, cohorts hatching after April rapidly lost biomass to an overtaking 'coevolving wave' of larger predators.…”

Section: Discussionmentioning

confidence: 66%

“…For haddock, 2 studies comparing the hatch dates of eggs to those of survivors collected some months later as demersal juveniles showed a pronounced shift in the distributions towards individuals hatching early in the year (Lapolla & Buckley 2005, Wright & Gibb 2005. In the case of North Sea haddock (Wright & Gibb 2005), the large contribution of age-2, first-time spawners to egg production later in the season (based on an analysis of commercially caught fish) was implicated as an agent for the negative selection on birth date, although other factors such as prey levels and seasonal trends in predator abundance and activity likely contributed.…”

Section: Discussionmentioning

confidence: 99%

“…Where M was lower and G higher than predicted, this variability could lead to episodic recruitment of lucky cohorts. However, the relatively smooth hatch date distributions observed for haddock young of the year (YOY)-juveniles on Georges Bank during 1995 to 1999 (Lapolla & Buckley 2005) suggest that this was a rare event during the GLOBEC study period, with the possible exception of 1997, a season of apparent high wind loss off the Bank.…”

Section: Discussionmentioning

confidence: 99%

“…Negative selection on hatch date was demonstrated for anadromous striped bass (Secor & Houde 1995, Limburg et al 1999 in 2 different estuaries with prey abundance apparently playing a role in at least 1 system. In both the North Sea (Wright & Gibb 2005) and the Northwest Atlantic (Lapolla & Buckley 2005), negative selection on hatch date has been reported for haddock. In the North Sea, the disproportionately large contribution of age-2, first-time spawners to egg production late in the season and their presumed lower egg viability was implicated in the observed negative selection on hatch date.…”

Section: Introductionmentioning

confidence: 99%

“…We examined models relating M to hatch date, photoperiod, and water temperature. We then investigated seasonal and inter-annual trends in the stage-specific or 'physiological' mortality rate (M/G) and cohort biomass and their role in recruitment variability and previously observed selection on birth date (Lapolla & Buckley 2005).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal trends in mortality and growth of cod and haddock larvae result in an optimal window for survival

Buckley¹,

Lough²,

Mountain³

2010

Mar. Ecol. Prog. Ser.

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Changing climate and global depletion of fish stocks have added urgency to the centuryold quest to understand the factors controlling fish production. The leading hypotheses advanced to explain the large (orders of magnitude) inter-annual variability in recruitment of young fish emphasize rapid growth and a match to prey production in the first weeks after hatching, although avoiding predators may be of equal or greater importance. Here we show for 2 important North Atlantic groundfish (Atlantic cod Gadus morhua and haddock Melanogrammus aeglefinus) that seasonal patterns in growth (G) and mortality (M) rates of young larvae combine in some years to yield a window of opportunity when M falls below G within days after hatching and cohort biomass increases rapidly possibly leading to high recruitment. Contrary to expectations, this window occurs early in the seasonal production cycle (February to March) when temperatures are near their annual minimum, fish larvae and their prey are relatively scarce, and G is low. In most cases examined, later, faster-growing cohorts appear to be rapidly lost to a suite of vertebrate and invertebrate predators whose abundance, metabolism, and consumption increase through the spring with increasing water temperature. In this seasonally varying environment, size on year day may be critical to minimizing M/G. Our data demonstrate the importance of rapid growth throughout the season cycle, but particularly early in the season when temperatures, potential prey, and predators are at seasonal low levels. These findings reinforce the importance of management practices protecting larger, older females that begin spawning earlier in the season and produce larger, more viable eggs and larvae.

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Section: Discussionmentioning

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Seasonal trends in mortality and growth of cod and haddock larvae result in an optimal window for survival

Buckley¹,

Lough²,

Mountain³

2010

Mar. Ecol. Prog. Ser.

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Costs and benefits of late nesting in cliff swallows

2014

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Many organisms of temperate latitudes exhibit declines in reproductive success as the breeding season advances. Experiments can delay the onset of reproduction for early breeders to investigate the consequences of late nesting, but it is rarely possible to observe a distinct second round of nesting in species that normally nest only once. The colonial cliff swallow (Petrochelidon pyrrhonota) is a migratory songbird that has a relatively short breeding season in the western Great Plains, USA, with birds rarely nesting late in the summer. Previous work suggested that ectoparasitism is a primary reason why reproductive success in this species declines over the summer. At colony sites where nests were fumigated to remove ectoparasitic swallow bugs (Oeciacus vicarius), cliff swallows frequently undertook a distinct round of late nesting after previously fledging young that year. Mark-recapture revealed that late-nesting pairs at these colonies produced fewer offspring that survived to the next breeding season, and that survival of late-nesting adults was lower during the next year, relative to pairs nesting earlier in the season. These reproductive costs applied in the absence of ectoparasites and likely reflect other environmental costs of late nesting such as seasonal declines in food availability or a delayed start of fall migration. Despite the costs, the estimated fitness for perennial early-and-late nesters in the absence of ectoparasites was equivalent to that of birds that nested only early in the season. The collective disadvantages of late nesting likely constrain most cliff swallows to raising a single brood in the middle latitudes of North America.

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Otolith microstructure reveals ecological and oceanographic processes important to ecosystem-based management

Sponaugle

2010

Environ Biol Fish

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Information obtained from fish otoliths has been a critical component of fisheries management for decades. The nature of this information has changed over time as management goals and approaches have shifted. The earliest and still most pervasively used data are those of annual age and growth used to calculate the demographic rates of populations in single-species management strategies. Over time, the absence of simple stock-recruitment relationships has focused attention on the youngest stages, where otolith microstructure resolved on a daily basis has become a valuable tool. As management has transitioned to more ecosystem-based approaches, the need to understand ecological and oceanographic processes has been advanced through the analysis of daily otolith microstructure. Recent field examples illustrate how otolith microstructure data have been used to reveal environmental influences on larval growth, traits that lead to higher survivorship, mechanisms of larval transport, dynamics of dispersal and population connectivity, determinants of recruitment magnitude, carry-over processes between life stages, habitatspecific juvenile survival, and identification of natal sources. Daily otolith-derived data collected at an individual level are increasingly combined with data from other disciplines and incorporated into individualbased models, which in turn can form the building blocks of complex models of ecosystem dynamics. A mechanistic understanding of the ecology of young stages is particularly necessary in light of a rapidly changing ocean environment, as we need to be able to predict individual and population responses to perturbations. Otolith microstructure analysis is an important tool in our management arsenal, contributing to a broader understanding of the oceanographic and ecological processes underlying ecosystem dynamics.

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Hatch date distributions of young-of-year haddock Melanogrammus aeglefinus in the Gulf of Maine/ Georges Bank region: implications for recruitment

Cited by 24 publications

References 34 publications

Seasonal trends in mortality and growth of cod and haddock larvae result in an optimal window for survival

Seasonal trends in mortality and growth of cod and haddock larvae result in an optimal window for survival

Costs and benefits of late nesting in cliff swallows

Otolith microstructure reveals ecological and oceanographic processes important to ecosystem-based management

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