Population structure of two deep-sea hydrothermal vent gastropods from the Juan de Fuca Ridge, NE Pacific

Kelly, Noreen E.; Meta×as, Anna

doi:10.1007/s00227-007-0828-4

Cited by 14 publications

(27 citation statements)

References 55 publications

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“…For the present study, information on the known lifehistory characteristics of L. fucensis was assembled from 2 types of subpopulations: established (limpets collected near the vent orifice in 2003) and colonized (limpets that colonized the surfaces of basalt blocksdeployed in 2001 and recovered in 2003 -which formed part of a larger study on settlement and colonization of hydrothermal vent invertebrates; ). Details of sample collection, processing and measurement are described in Kelly & Metaxas (2008a).…”

Section: Methodsmentioning

confidence: 99%

“…This model assumes all individuals in a given stage are subject to identical mortality, growth and fecundity schedules. We estimated σ i of Lepetodrilus fucensis using the length-frequency distributions from the established populations collected in 2003 at ROPOS, Cloud and Clam Bed vent sites (Kelly & Metaxas 2008a). We estimated instantaneous mortality (z i ) over each stage using the combined length-frequency distributions from the 3 vent sites.…”

Section: Methodsmentioning

confidence: 99%

“…To calculate d i for each stage, the age of limpets at the stage boundaries was estimated using the linear regression between length-at-day (LAD) and known age of the population (Kelly & Metaxas 2008a). We assumed a linear relationship as a first approximation to estimating growth in Lepetodrilus fucensis, since we are lacking the high-resolution temporal measurements, as well as concurrent measures of growth and vent fluid properties, currently required to generate more sophisticated growth models (for further discussion see Kelly & Metaxas 2008a).…”

Section: Methodsmentioning

confidence: 99%

“…As most life-history traits of L. fucensis have been measured as a function of body size (i.e. size-at-maturity and fecundity, ; growth rates and attainment of a size refuge that reduces post-settlement mortality, Kelly & Metaxas 2008a), we used this empirical information to create a stage class matrix model for L. fucensis. We adopted a prospective approach, using elasticity analyses to identify which life stages had the greatest potential impact on the population growth rate.…”

Section: Introductionmentioning

confidence: 99%

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Understanding population dynamics of a numerically dominant species at hydrothermal vents: a matrix modeling approach

Kelly

Meta×as²

2010

Mar. Ecol. Prog. Ser.

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Using a stage-based matrix model, we explored the population dynamics and lifehistory traits of the numerically dominant deep-sea limpet Lepetodrilus fucensis at hydrothermal vents on the Juan de Fuca Ridge, northeast Pacific, to determine the potential mechanisms for the success of this species in an ephemeral and variable ecosystem. The life-history traits of L. fucensis differed from those generally expected for species in fluctuating and unpredictable habitats, in that variation in survival of recruits had the largest effect on population growth, while perturbations in adult survival or fecundity had little influence. However, rapid individual growth rates were also necessary to achieve long-term population growth. The modeled stable stage distribution adequately represented the dynamics of settler and recruit stages, but did not match those of adult stages, in populations sampled from 3 different sites. This suggests that factors not accounted for within the model, such as changing individual behaviour across life stages in response to environmental stimuli, may be important in shaping the structure of L. fucensis populations in different microhabitats. In numerical experiments, density-dependent survival and growth of settlers resulted in fluctuations in population growth rate and suppressed total population size over time. Reproductive failure due to parasitic infection decreased local recruitment, but did not result in population extinction. Faster growth rates allowed for population persistence under greater levels of chronic disturbance. Recovery time after a catastrophic disturbance fit within the time frames observed for eruptions in nature. Overall, our analyses emphasize the possible variation in life-history tactics exhibited by organisms in extreme and variable habitats, and demonstrate the high potential of models, originally developed for use in other ecosystems, to accelerate research in deep-sea communities.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Understanding population dynamics of a numerically dominant species at hydrothermal vents: a matrix modeling approach

Kelly

Meta×as²

2010

Mar. Ecol. Prog. Ser.

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“…For marine species with dispersive larvae, larval settlement patterns and preferences are sometimes inferred from recruitment or population size structures (e.g. Bergquist et al 2002, Kelly & Metaxas 2008), but such inferences should generally be regarded as hypotheses unless they have been tested experimentally. Settlement, which is the initial establishment of larvae onto a substratum, is affected by pre-settlement factors such as larval dispersal, supply of larvae to a habitat, settlement cues, and habitat selection.…”

Section: Introductionmentioning

confidence: 99%

Pre- and post-settlement factors controlling spatial variation in recruitment across a cold-seep mussel bed

Arellano¹,

Young²

2010

Mar. Ecol. Prog. Ser.

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The size structure of a population of the mussel 'Bathymodiolus' childressi shifts dramatically across the mussel bed encircling the Brine Pool NR 1 cold seep in the Gulf of Mexico. While the fringes of the bed are inhabited by large mussels, small juveniles are abundant only at the edge of the pool, leading to the inference that larvae settle preferentially near the source of methane. We used in situ experiments to test whether this shift in size distribution is structured by differences in larval supply, settlement, substratum selection by settling larvae, juvenile mortality, growth, or predation across the mussel bed. We investigated the variation of these factors adjacent to the pool, at the fringes of the mussel bed, and also 2 m away from the bed. Neither the supply of larvae nor the density of settlers (< 0.5 mm long) collected on settlement plates differed among the 3 zones. Juveniles (mean length: 9 mm) survived and grew equally well in all 3 zones. Survival was higher in caged than in uncaged juveniles (5 to 15 mm long), but mortality of uncaged juveniles was similar at all distances from the pool, suggesting that predation alone does not cause the observed differences in size structure. We reject the prevailing hypothesis that the distribution pattern can be attributed to settlement preferences of larvae alone. We hypothesize that very early post-settlement mortality, secondary settlement, and/or later migration of juveniles play a role in establishing and maintaining the persistent pattern of size structure across this mussel bed.

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Circulation, hydrography, and transport over the summit of Axial Seamount, a deep volcano in the Northeast Pacific

Lavelle

2017

JGR Oceans

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A numerical model of ocean flow, hydrography, and transport is used to extrapolate observations of currents and hydrography and infer patterns of material flux in the deep ocean around Axial Seamount, a destination node of NSF's Ocean Observatories Initiative's Cabled Array. Using an inverse method, the model is made to approximate measured deep ocean flow around this site during a 35 day time period in the year 2002. The model is then used to extract month‐long mean patterns and examine smaller‐scale spatial and temporal variability around Axial. Like prior observations, model month‐long mean currents flow anticyclonically around the seamount's summit in toroidal form with maximum speeds at 1500 m depth of 10–11 cm/s. As a time mean, the temperature (salinity) anomaly distribution takes the form of a cold (briny) dome above the summit. Passive tracer material continually released at the location of the ASHES vent field exits the caldera primarily through its southern open end before filling the caldera. Once outside the caldera, the tracer circles the summit in clockwise fashion, fractionally reentering the caldera over lower walls at its north end, while gradually bleeding southwestward during the modeled time period into the ambient ocean. A second tracer release experiment using a source of only 2 day duration inside and near the CASM vent field at the northern end of the caldera suggests a residence time of the fluid at that locale of 8–9 days.

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Population structure of two deep-sea hydrothermal vent gastropods from the Juan de Fuca Ridge, NE Pacific

Cited by 14 publications

References 55 publications

Understanding population dynamics of a numerically dominant species at hydrothermal vents: a matrix modeling approach

Understanding population dynamics of a numerically dominant species at hydrothermal vents: a matrix modeling approach

Pre- and post-settlement factors controlling spatial variation in recruitment across a cold-seep mussel bed

Circulation, hydrography, and transport over the summit of Axial Seamount, a deep volcano in the Northeast Pacific

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