Larval Development of the Intertidal Barnacles Jehlius Cirratus and Notochthamalus Scabrosus (Cirripedia: Chthamalidae) under Laboratory Conditions

Venegas, Roberto M.; Navarrete, Sergio A.; Olguín, Andrés; Ortíz, Verónica Alejandra Salame

doi:10.1163/20021975-99990065

Cited by 19 publications

(6 citation statements)

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“…Studies of the focal species indicate that reproductive and larval development is similar to other chthamalids and dependent on water temperature (Venegas et al. ). Additionally, the development time from cyprid until settlement and metamorphosis is ~10 days (Venegas et al.…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, the development time from cyprid until settlement and metamorphosis is ~10 days (Venegas et al. ). Recruitment is greatest from October to December along the north‐central coast of Chile (Lagos et al.…”

Section: Methodsmentioning

confidence: 99%

“…A particle was assumed to be competent to settle after 23–30 days had passed from release (Venegas et al. ; Navarrete et al. ) if found within 15 km of the coast.…”

Section: Methodsmentioning

confidence: 99%

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The oceanic concordance of phylogeography and biogeography: a case study in Notochthamalus

Ewers‐Saucedo

Pringle

Sepúlveda

et al. 2016

Ecology and Evolution

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Dispersal and adaptation are the two primary mechanisms that set the range distributions for a population or species. As such, understanding how these mechanisms interact in marine organisms in particular – with capacity for long‐range dispersal and a poor understanding of what selective environments species are responding to – can provide useful insights for the exploration of biogeographic patterns. Previously, the barnacle Notochthamalus scabrosus has revealed two evolutionarily distinct lineages with a joint distribution that suggests an association with one of the two major biogeographic boundaries (~30°S) along the coast of Chile. However, spatial and genomic sampling of this system has been limited until now. We hypothesized that given the strong oceanographic and environmental shifts associated with the other major biogeographic boundary (~42°S) for Chilean coastal invertebrates, the southern mitochondrial lineage would dominate or go to fixation in locations further to the south. We also evaluated nuclear polymorphism data from 130 single nucleotide polymorphisms to evaluate the concordance of the signal from the nuclear genome with that of the mitochondrial sample. Through the application of standard population genetic approaches along with a Lagrangian ocean connectivity model, we describe the codistribution of these lineages through a simultaneous evaluation of coastal lineage frequencies, an approximation of larval behavior, and current‐driven dispersal. Our results show that this pattern could not persist without the two lineages having distinct environmental optima. We suggest that a more thorough integration of larval dynamics, explicit dispersal models, and near‐shore environmental analysis can explain much of the coastal biogeography of Chile.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The oceanic concordance of phylogeography and biogeography: a case study in Notochthamalus

Ewers‐Saucedo

Pringle

Sepúlveda

et al. 2016

Ecology and Evolution

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“…However, the most direct contrast of the taxa included here involves the barnacles N. scabrosus and J. cirratus, which are ecologically nearly indistinguishable (Lamb et al 2014;Shinen & Navarrete 2010 with little known distinction in larval life history. In fact, though N. scabrosus exhibits significant phylogeographic structure (Ewers-Saucedo et al 2016), the larvae of N. scabrosus appear to require longer times in the plankton and longer times for cyprid metamorphosis than J. cirratus (Venegas et al 2000). Whether the cause for this contrast in population structure across a large geographic range is ecological, physiological, or simply chance remains unclear.…”

Section: (2016)mentioning

confidence: 99%

Peer Review #1 of "Large-scale gene flow in the barnacle Jehlius cirratus and contrasts with other broadly-distributed taxa along the Chilean coast (v0.1)"

2017

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We evaluate the population genetic structure of the intertidal barnacle Jehlius cirratus across a broad portion of its geographic distribution using data from the mitochondrial cytochrome oxidase I (COI) gene region. Despite sampling diversity from over 3000 km of the linear range of this species, there is only slight regional structure indicated, with overall Φ CT of 0.036 (p<0.001) yet no support for isolation by distance. While these results suggest greater structure than previous studies of J. cirratus had indicated, the pattern of diversity is still far more subtle than in other similarly-distributed species with similar larval and life history traits. We compare these data and results with recent findings in four other intertidal species that have planktotrophic larvae. There are no clear patterns among these taxa that can be associated with intertidal depth or other known life history traits.

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“…The experimental sites at Temblador, Guanaqueros, Estació n Costera de Investigaciones Marinas at Las Cruces (ECIM), and Matanzas were specifically chosen because they also represent a wide range of barnacle recruitment rates typical of the region (Navarrete et al 2002;Shinen and Navarrete 2010). Both species have planktotrophic larvae that spend between 20-30 days in the water to develop to competent cypris stage (Venegas et al 2000), and all larval stages can be found in surface waters a few kilometers offshore (Vargas et al 2003(Vargas et al , 2006, suggesting comparatively moderate to large dispersal potential in these species. Once settled, metamorphosis takes place within 1-3 days (Tapia and Navarrete 2010), and individuals can be readily identified to the species level under a dissecting microscope.…”

Section: Study Systemmentioning

confidence: 99%

Lottery Coexistence on Rocky Shores: Weak Niche Differentiation or Equal Competitors Engaged in Neutral Dynamics?

Shinen

Navarrete

2014

The American Naturalist

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Reconciling how niche and neutral processes may be important in species coexistence has revealed two important weaknesses in our collective understanding of species diversity: few empirical studies have determined whether species are truly coexisting, and fewer still have properly evaluated whether coexistence is achieved through niche differentiation or ecological equivalence. Here, we ask whether two common barnacles, Jehlius cirratus and Notochthamalus scabrosus, coexist locally and whether the slight but persistent differences in their distribution provide sufficient fitness trade-offs to overcome differences in competition. Both species recovered after experimental reduction; that is, they coexist, with no indication of hierarchical exclusion. No fitness inequalities affected species performance or interference effects on vital rates at any shore level, indicating no trade-offs in intra-interspecific effects across the ecological gradient. Additionally, no relationship was found between per capita population growth rates of either species with its own relative abundance; that is, neither species has a demographic advantage when rare. Instead, a lottery for space during settlement largely determines species' distributions, evidenced by the positive correlation across sites and tidal elevations between the relative abundances of adults and the recruits of the prior season. We conclude that Jehlius and Notochthamalus coexist neutrally, or nearly so, but discuss whether small, nonsignificant, and probably ephemeral fitness differences, which are inconsistent across the tidal gradient, could provide enough niche differentiation to promote coexistence.

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Larval Development of the Intertidal Barnacles Jehlius Cirratus and Notochthamalus Scabrosus (Cirripedia: Chthamalidae) under Laboratory Conditions

Cited by 19 publications

References 0 publications

The oceanic concordance of phylogeography and biogeography: a case study in Notochthamalus

The oceanic concordance of phylogeography and biogeography: a case study in Notochthamalus

Peer Review #1 of "Large-scale gene flow in the barnacle Jehlius cirratus and contrasts with other broadly-distributed taxa along the Chilean coast (v0.1)"

Lottery Coexistence on Rocky Shores: Weak Niche Differentiation or Equal Competitors Engaged in Neutral Dynamics?

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