Temporal changes in the strength of density‐dependent mortality and growth in intertidal barnacles

Jenkins, Stuart R.; Murua, Jefferson; Burrows, Michael T.

doi:10.1111/j.1365-2656.2008.01366.x

Cited by 54 publications

(64 citation statements)

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“…Observed patterns of population density in Semibalanus balanoides reflect either settlement and recruitment or post-settlement and later survival, or both (Hunt & Scheibling 1997, Jenkins et al 2008. Without repeated censuses in this study, we are unable to discriminate between these processes, but inferences can be made by examination of patterns in juvenile density (which reflect patterns of settlement/ recruitment) and the ratio of juveniles to adults (which may reflect post-settlement survival).…”

Section: Barnacle Density Increased With Wave Exposurementioning

confidence: 82%

“…Variance to mean ratio was 1.08 for juvenile counts in 2006 and 0.43 for adult counts, while the ratio for average size was only 0.03 for adults and 0.04 for juveniles. The relatively small number of replicates per site will have given less representative estimates of density than size of barnacles.Observed patterns of population density in Semibalanus balanoides reflect either settlement and recruitment or post-settlement and later survival, or both (Hunt & Scheibling 1997, Jenkins et al 2008. Without repeated censuses in this study, we are unable to discriminate between these processes, but inferences can be made by examination of patterns in juvenile density (which reflect patterns of settlement/ recruitment) and the ratio of juveniles to adults (which may reflect post-settlement survival).…”

mentioning

confidence: 82%

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 97%

“…We predicted that (1) food supply modified by flow rate would determine growth rate in this barnacle, and that this would result in larger barnacles for a given age and a shift towards larger average size in areas of higher food concentrations and faster flow. (2) Faster flow rate was also predicted locally to enhance larval supply and thus settlement density, with greater densitydependent mortality at high settlement sites (Jenkins et al 2008) and a potentially faster turnover in these populations.We exploited the fjordic and island-based geography of the west coast of Scotland to quantify variability in population density and size distributions of adult and juvenile Semibalanus balanoides at over 250 sites in contrasting regional and local conditions to test these hypotheses. We used a recently developed model ) to determine likely wave exposure at our survey sites.…”

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confidence: 97%

“…If this ratio is indicative, survival appears to be reduced in enclosed areas in this species. This pattern may be mediated by the influence of recruitment on the level of mortality dependent on post-settlement density (Jenkins et al 2008) since high levels of survival were associated with low numbers of juveniles in open areas.Coastal topography, as expressed by our openness measure, should influence larval retention and thus larval supply. Populations on open coastlines and headlands should suffer losses of larval output through advection away from the coast into the open sea and through simple dilution effects (e.g.…”

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confidence: 99%

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Spatial variation in size and density of adult and post-settlement Semibalanus balanoides: effects of oceanographic and local conditions

Burrows¹,

Jenkins²,

Robb³

et al. 2010

Mar. Ecol. Prog. Ser.

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Regional oceanographic processes are emerging as strong influences on growth and recruitment of intertidal species, with important consequences for populations. Yet local conditions such as wave exposure are also important. To disentangle these effects for the intertidal barnacle Semibalanus balanoides, we surveyed 259 sites around Scotland in July and August over 6 yr (from 2001 to 2006). Scaled digital photographs at 3 shore levels gave sizes and densities of juvenile and adult barnacles for comparison with wave fetch, remotely sensed chlorophyll a (chl a) concentration and seasonal sea surface temperature (SST). Patterns were also compared with site 'openness': the area of connected open sea < 30 km away. Patterns at the 3 shore levels were similar. Hierarchical partitioning (HP) showed that survey year had the biggest effect and improved the predictive power of other variables: wave fetch for adult and juvenile densities, chl a for juvenile size and openness for adult size. SST had little effect. Regression models selected using information theoretic measures included positive effects of chl a, varying among surveys, on average size of barnacles (R 2 from 0.5 to 0.6), and larger high shore barnacles in greater wave exposure. Population densities of adults and juveniles increased with wave fetch, with chl a only influencing density at high shore levels (R 2 from 0.1 to 0.4). Despite temporal and spatial variation in responses to chl a and wave fetch among surveys, relationships were consistent with growth and size in S. balanoides being limited by food supply, and increased recruitment and adult densities in increased wave exposure. Large-scale ecological patterns in this rocky intertidal species thus result from large-scale oceanographic effects on food concentration with habitat-scale wave-mediated effects on supply of food and larvae. 398: 207-219, 2010 where such features dominate , while local wind-driven flows influence settlement rate (e.g. Hawkins & Hartnoll 1982). Patterns of current flow ultimately result in site-specific transport patterns, as described by dispersal kernels (Aiken et al. 2007), and thus determine population connectivity (Pineda et al. 2007). (2) Oceanographic conditions influence phytoplankton productivity, and this affects feeding success and energy content of dispersing planktotrophic larvae, with continuing effects on postsettlement survival (Emlet & Sadro 2006). In filter feeders such as barnacles, post-settlement growth rates are increased by higher phytoplankton biomass (Menge et al. 1997, Sanford & Menge 2001, while size-specific egg numbers and thus fecundity are also dependent on food supply . (3) At ocean scales, current-driven heat fluxes structure regional climates, with consequent effects (e.g. El Niño) that often trump smaller scale influences of oceanographic conditions on coastal marine systems. KEY WORDS: Phytoplankton · Wave exposure · Growth · Recruitment · Semibalanus balanoides Resale or republication not permitted without written consent of the ...

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Section: Barnacle Density Increased With Wave Exposurementioning

confidence: 82%

mentioning

confidence: 82%

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 97%

mentioning

confidence: 97%

mentioning

confidence: 99%

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Spatial variation in size and density of adult and post-settlement Semibalanus balanoides: effects of oceanographic and local conditions

Burrows¹,

Jenkins²,

Robb³

et al. 2010

Mar. Ecol. Prog. Ser.

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Benthic–pelagic coupling and bottom‐up forcing in rocky intertidal communities along the Atlantic Canadian coast

Scrosati

Ellrich

2018

Ecosphere

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Benthic species from rocky intertidal systems are irregularly distributed along marine coastlines. Nearshore pelagic conditions often help to explain such variation, but most such studies have been done on eastern ocean boundary coasts. We investigated possible benthic–pelagic coupling along the Atlantic coast of Nova Scotia, a western ocean boundary coast. In 2014, we surveyed high‐intertidal habitats from nine wave‐exposed bedrock locations spanning 415 km of coastline. At each location in the spring, we measured the recruitment of barnacles and mussels, the two main filter‐feeders. Recruitment varied irregularly along the coast. Satellite data on coastal phytoplankton and particulate organic carbon (food for intertidal filter‐feeders and their pelagic larvae) and in‐situ data on sea surface temperature explained, to varying degrees, the geographic structure of recruitment. In turn, the summer abundance of barnacles and mussels was positively related to their spring recruitment. Ultimately, intertidal predator (dogwhelk) abundance was positively related to the recruitment and/or abundance of barnacles and mussels (the main prey of dogwhelks). Sea ice may also have influenced this predator–prey interaction. Drift ice leaving the Gulf of St. Lawrence in late winter strongly disturbed the northern surveyed locations, making barnacles (through high spring recruitment) the only food source for dogwhelks (which survived ice scour in crevices) in such places. Overall, this study supports the occurrence of benthic–pelagic coupling and bottom‐up forcing on this coast. Investigating the oceanographic drivers of pelagic food supply and seawater temperature should help to further understand how this large metacommunity is organized.

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Effects of habitat area and spatial configuration on biodiversity in an experimental intertidal community

Loke

Chisholm

Todd

2019

Ecology

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Isolating the effects of fragmentation per se (i.e., spatial configuration of habitat patches) on species richness is an ongoing challenge as habitat configuration often covaries with the amount of habitat. Consequently, there is a lack of experimental evidence for configurational effects on species richness in the whole landscape. Here, we developed a novel experimental system for testing the independent and interactive effects of habitat area and configuration on tropical intertidal species richness. Our results confirmed the expectation that average species richness would increase monotonically with habitat area. More intriguingly, we found mixed evidence for a non‐monotonic relationship between species richness and fragmentation per se, with the highest richness at intermediate fragmentation configuration, that is, when habitat tiles were placed in a “several‐small” configuration. The effect of habitat configuration was not due to passive sampling (since area was controlled for), variation in total individual abundance, or niche specialization of species to different landscape configurations. We postulate that a combination of processes, including local negative density dependence and dispersal limitation, could give rise to the observed pattern. We emphasize the importance of considering configurational effects on biodiversity at broader spatial scales and for more experimental research to delve into the mechanisms driving the patterns seen here.

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Temporal changes in the strength of density‐dependent mortality and growth in intertidal barnacles

Cited by 54 publications

References 53 publications

Spatial variation in size and density of adult and post-settlement Semibalanus balanoides: effects of oceanographic and local conditions

Spatial variation in size and density of adult and post-settlement Semibalanus balanoides: effects of oceanographic and local conditions

Benthic–pelagic coupling and bottom‐up forcing in rocky intertidal communities along the Atlantic Canadian coast

Effects of habitat area and spatial configuration on biodiversity in an experimental intertidal community

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