New Locality for Notochthamalus Scabrosus (Crustacea, Cirripedia): Bahía Lapataia, Beagle Channel, Tierra Del Fuego, Argentina

Curelovich, Jessica; Lovrich, Gustavo A.; Calcagno, Javier Á.

doi:10.4067/s0718-686x2009000200005

Cited by 5 publications

(3 citation statements)

References 3 publications

(3 reference statements)

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“…For a typical cline, we might expect the B clade to go toward fixation in samples taken further south (but see Wares and Cunningham 2005 ); instead, it never is found at frequency greater than 30%. While additional information may be necessary from populations of N. scabrosus still further south (it is found as far south as Beagle Channel in southern Argentina; ( Curelovich et al 2009 ), the behavior of this evolutionary lineage is much like a cryptic species with more restrictive physiological tolerances ( Schizas et al 2001 ). Sequence data from a single nuclear marker (elongation factor 1-alpha) suggested that the major haplogroups in N. scabrosus are randomly mating ( Zakas et al 2009 ); additional data from the nuclear genome will be necessary to evaluate the potential mechanisms maintaining the distributional edge of this lineage.…”

Section: Discussionmentioning

confidence: 99%

Mitochondrial lineages in Notochthamalus scabrosus as indicators of coastal recruitment and interactions

Laughlin

Ewers‐Saucedo

Wares

2012

Ecology and Evolution

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A significant genetic cline has previously been identified along the Chilean coast in the barnacle Notochthamalus scabrosus. Samples from the previous study, spanning 800 km, were not able to show whether the southern lineage ultimately goes to fixation at higher latitudes. In addition to expanding the geographic sampling of this species, locations that were sampled approximately four to five generations ago were resampled for this study, enabling a temporal comparison of the location and strength of the observed cline. Here, we show that although the cline persists as expected, the tremendous changes in observed lineage frequencies near the clinal boundary are indicative of source-sink dynamics that may be associated with a codistributed biogeographic transition zone. We also find that the southern lineage does not increase in frequency in more southern populations, suggesting that this lineage is maintained through a combination of density-dependent interactions and a coastal fitness gradient.

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Section: Discussionmentioning

confidence: 99%

Mitochondrial lineages in Notochthamalus scabrosus as indicators of coastal recruitment and interactions

Laughlin

Ewers‐Saucedo

Wares

2012

Ecology and Evolution

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“…Surface salinities in the mid Beagle Channel range from 29.4 to 32.7 ‰S year round (Isla et al 1999; Diaz et al 2018) while in coastal bays, salinity can be as low as 15.0 to 19.4 ‰S, owing to local fresh water runoff from rivers and streams, but reaching 31.7 ‰S due to evaporation, with an annual mean of ≈27 ‰S (Curelovich et al 2009). The Beagle Channel thus exhibits salinities slightly less than seawater, and can be considered an estuarine regime in character (Isla et al 1999).…”

Section: Methodsmentioning

confidence: 99%

Evolutionary trade-offs in osmotic and ionic regulation and the expression of gill ion transporter genes in high latitude, Neotropical cold clime crabs from the ‘end of the world’

McNamara

Maraschi

Tapella

et al. 2022

Preprint

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Seeking to identify consequences of evolution at low temperature, we examine hyper/hypo-osmotic and ionic regulation and gill ion transporter gene expression in two sub-Antarctic Eubrachyura from the Beagle Channel, Tierra del Fuego. Despite sharing the same osmotic niche, Acanthocyclus albatrossis tolerates a wider salinity range (2-65 ‰S) than Halicarcinus planatus (5-60 ‰ S); respective lower and upper critical salinities are 4 and 12 ‰S, and 63 and 50 ‰S. Acanthocyclus albatrossis is a weak hyperosmotic regulator, while H. planatus hyper-osmoconforms; isosmotic points are 1,380 and ≈1,340 mOsm kg-1 H2O. Both crabs hyper/hypo-regulate [Cl-] well with iso-chloride points at 452 and 316 mmol L-1 Cl-, respectively. [Na+] is hyper-regulated at all salinities. mRNA expression of gill Na+/K+-ATPase is salinity-sensitive in A. albatrossis, increasing ≈1.9-fold at 5 ‰S compared to 30 ‰S, decreasing at 40 to 60 ‰S. Expression in H. planatus is very low salinity-sensitive, increasing ≈4.7-fold over 30 ‰S, but decreasing at 50 ‰S. V(H+)-ATPase expression decreases in A. albatrossis at low and high salinities as in H. planatus. Na+-K+-2Cl- symporter expression in A. albatrossis increases 2.6-fold at 5 ‰S, but decreases at 60 ‰S compared to 30 ‰S. Chloride uptake may be mediated by increased Na+-K+-2Cl- expression but Cl- secretion is independent of symporter expression. These unrelated eubrachyurans exhibit similar systemic osmoregulatory characteristics and are better adapted to dilute media; however, the gene expressions underlying ion uptake and secretion show marked interspecific divergences. Cold clime crabs may have limited energy expenditure by regulating hemolymph [Cl-] alone, apportioning resources for other metabolic processes.

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“…Tides are semidiurnal; the surface water temperature ranges from 4.4°C in August to 9.4°C in January. Salinity reaches an average of 24 psu during November–March, attaining local minimum values as low as 15 psu in near-shore waters (Curelovich et al , 2009).…”

Section: Methodsmentioning

confidence: 99%

Recruitment and zonation in a sub-Antarctic rocky intertidal community

et al. 2016

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This study presents for the first time the factors governing the recruitment in a rocky intertidal community of the Beagle Channel, Tierra del Fuego (54°51′S 68°29′W), Argentina. The aim of this study was to examine the effect of grazers and predators, free substrate availability and crustose coralline algae on the recruitment of the main sessile components of the intertidal:Notochthamalus scabrosus, Notobalanus flosculus, Mytilus chilensis, Perumytilus purpuratusandAulacomya atraat three intertidal levels. For barnacles, the probability of recruitment was higher with grazers, while the contrary was observed for bivalves. The number ofN. flosculusrecruits was higher with increased substrate availability, whileN. scabrosusrecruited more with reduced free substrate in the first sampling. Mussel recruitment was higher with reduced free substrate. The highest probability of recruitment ofN. scabrosuswas observed at the upper level. Notably, this probability and the recruits per plot were higher at the mid level under uncaged-ORP treatment than expected for the mid level. The probability of bivalve andN. flosculusrecruitment was higher at upper and lower levels, respectively. At the lower level, barnacle recruitment was higher on bare rock than on crustose coralline algae. Our results suggest that grazers increase the probability of barnacle recruitment, while the presence of sessile organisms enhances the density of mussel recruits. Almost no recruitment of bivalves was observed in ORPs over one year, showing that the secondary succession is slow in this environment.

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New Locality for Notochthamalus Scabrosus (Crustacea, Cirripedia): Bahía Lapataia, Beagle Channel, Tierra Del Fuego, Argentina

Cited by 5 publications

References 3 publications

Mitochondrial lineages in Notochthamalus scabrosus as indicators of coastal recruitment and interactions

Mitochondrial lineages in Notochthamalus scabrosus as indicators of coastal recruitment and interactions

Evolutionary trade-offs in osmotic and ionic regulation and the expression of gill ion transporter genes in high latitude, Neotropical cold clime crabs from the ‘end of the world’

Recruitment and zonation in a sub-Antarctic rocky intertidal community

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