North Patagonian estuaries appear to function as nursery habitats for marble crab (Metacarcinus edwardsii)

Pardo, Luis Miguel; Rubilar, Pedro S.; Fuentes, Juan Pablo

doi:10.1016/j.rsma.2020.101315

Cited by 5 publications

(4 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With respect to the bathymetric pattern of abundance for M. gregaria, its higher abundance in the most superficial strata can be explained by the high supply of organic matter in these strata in fjords, provided by the rivers, which represent an important food source for M. gregaria [27]. With regard to the bathymetric pattern of abundance of M. edwardsii, our findings agree with those reported by Muñoz et al, 2006 [29] in the San Vicente Bay (Central Chile), and can be explained by physiological characteristics that allow it to inhabit areas with low salinity (i.e., first bathymetric stratum influenced by estuarine stratification) [30] and the possible unavailability of soft bottom habitat in the depths of Magdalena Sound. At the assemblage level we found that species abundance and species richness decreased with the depth, which agrees with previous studies conducted in the Magdalena Sound [14,15] and are similar to the global trends of diversity and depth reported in the literature [15,31,32].…”

Section: Discussionsupporting

confidence: 92%

Decapods Associated with the Southern King Crab (Lithodes santolla) Fishery in Central Patagonia (44° S, Chile)

Figueroa-Muñoz

Molinet

Díaz

et al. 2021

JMSE

View full text Add to dashboard Cite

The southern king crab, Lithodes santolla, is an important fishery resource in the inner seas of Chilean Patagonia. The fishing gear used to catch southern king crab (bait trap) and its operation at different depths over several months provide the opportunity to gather information about relative abundance. The aim of the present study was to analyze the information collected from the catches of southern king crab and its associated fauna in the Magdalena Fjord to study the biodiversity and ecology of scavenging decapod crustaceans. Specifically, the study aimed to determine the bathymetric patterns of abundance by species, to model the abundance by season (winter and spring) and to determine the structuring pattern of scavenging decapods assemblage. Samples were collected between June and November 2019 by deploying traps in four bathymetric strata: 1 = 0–50 m; 2 = 51–100 m; 3 =101–150 m; 4 = 151–200 m. We registered a total of 673 decapod specimens associated with the southern king crab fishery, representing five species: Lithodes santolla (n = 96), Libidoclaea smithii (n = 10), Metacarcinus edwardsii (n = 58), Munida gregaria (n = 507) and Peltarion spinulosum (n = 2). The abundance of decapod species varied by month and bathymetric strata. We found bathymetric patterns for L. santolla abundance, M. gregaria, M. edwardsii, and total species abundance. The most informative model to explain scavenging decapod abundance by generalized linear model (GLM) included species and season. The null model of species co-occurrence analysis revealed that all species associations during the sampled months were random. Our study is the first that provides evidence about patterns of bathymetrical and temporal variation of scavenging decapod abundance and expands the body of knowledge regarding the biodiversity of scavenger decapods in the Magdalena Sound.

show abstract

Section: Discussionsupporting

confidence: 92%

Decapods Associated with the Southern King Crab (Lithodes santolla) Fishery in Central Patagonia (44° S, Chile)

Figueroa-Muñoz

Molinet

Díaz

et al. 2021

JMSE

View full text Add to dashboard Cite

show abstract

“…Megalopae are abundant during October and December, coinciding with the advection of warm waters towards the coast 33 . Larvae recruit in association with the estuarine environment 34 . Laboratory experiments have demonstrated a planktonic larval duration of 60 days at 15 °C 35 , and a population genetic study based on eight microsatellites found high gene flow among populations over 700 km apart 36 .…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal stability in the genetic structure of a marine crab despite a biogeographic break

Véliz

Rojas‐Hernández

Vega‐Retter

et al. 2022

Sci Rep

Self Cite

View full text Add to dashboard Cite

Elucidating the processes responsible for maintaining the population connectivity of marine benthic species mediated by larval dispersal remains a fundamental question in marine ecology and fishery management. Understanding these processes becomes particularly important in areas with a biogeographic break and unidirectional water movement along the sides of the break. Based on variability at 4209 single-nucleotide polymorphisms in 234 individuals, we determine the genetic structure, temporal genetic stability, and gene flow among populations of the commercially important mola rock crab Metacarcinus edwardsii in a system in southern Chile with a biogeographic break at latitude 42°S. Specimens were collected at eight sites within its geographic distribution, with collection at four of these sites was performed twice. Using population genetic approaches, we found no evidence of geographic or temporal population differentiation. Similarly, we found no evidence of an effect on gene flow of the biogeographic break caused by the the West Wind Drift Current. Moreover, migration analyses supported gene flow among all sites but at different rates for different pairs of sites. Overall, our findings indicate that M. edwardsii comprises a single large population with high levels of gene flow among sites separated by over 1700 km and demonstrate temporal stability in its genetic structure.

show abstract

“…Their fishing grounds are situated within a marine ecosystem considered not only pristine compared to northern regions (Godoy et al, 2010;Navarrete et al, 2010), but also characterized by a high species richness (Fernandez et al, 2000;Häussermann and Försterra, 2009;Försterra et al, 2016;Betti et al, 2017;Bertolino et al, 2020). The presence of diverse and unique habitats not only support species richness but also host high abundances and biomass of important commercial species (Flores et al, 2020;Pardo et al, 2020). These highly productive ecosystems have been the target of illegal fishing, and regional fisheries authorities have needed to co-operate with local fishers to address the constant influx of fishers from neighboring regions.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Exploitation Intensity of Commercial Species and Associated Benthic Communities, in Chilean Marine Management Areas of North Patagonia

Hamamé

Ortiz

2022

Front. Mar. Sci.

View full text Add to dashboard Cite

The Aysén region of Chile (North Patagonia), has had limited studies on the effectiveness of management and exploitation areas of benthic resources, and performance relative to open access areas in this region has never been evaluated. We evaluated seven management areas (MAs) and five open access areas (OAAs) between 43.9°S and 45.2°S for exploitation intensity of three commercial species (Concholepas concholepas, Loxechinus albus, and Ameghinomya antiqua) together with characterization of the benthic community. Indicators based on size, density and weight were used to evaluate exploitation intensity of commercial species. Associated benthic communities were evaluated considering density, species composition, and community structure. We found a high species richness and a community structure with low variability between MAs and OAAs. Low densities and small sizes classes of C. concholepas in most of the areas indicated high exploitation intensity in both MAs and OAAs. In this context, a permanent ban to harvest C. concholepas within OAAs may need to be reevaluated since with no enforcement and monitoring, the exploitation status of this species remains unclear in these areas. L. albus in most areas were absent in the harvestable sizes, which could be indicating high exploitation intensity in both regimes. High densities and small sizes of C. concholepas and L. albus in some MAs, indicated a potential recruitment zones which bears further investigation. A. antiqua, showed better conditions than other commercial species evaluated, with no significant differences in densities and size-based indicators when comparing OAAs and MAs. Benthic communities were dominated numerically by the Echinoidea class in both MAs and OAAs, with L. albus, Arbacia dufresnii and Pseudechinus magellanicus being the dominant species. High densities of sea urchins co-occurring with low coverage of macroalgae found in MAs-Gala could indicate that a sea urchin barren was dominant during the study period. On the other hand, high densities of Cosmasterias lurida, a predatory sea star, in conjunction with low densities of C. concholepas in most of the studied areas suggested that a shift in predator roles is occurring. No differences were estimated in terms of fisheries indicators and benthic community structure across the two management regimes, suggesting the poor performance of MAs in Aysén region. Our data also support the need to improve monitoring of MAs especially with respect to associated benthic community incorporating a broader spatial scale.

show abstract

North Patagonian estuaries appear to function as nursery habitats for marble crab (Metacarcinus edwardsii)

Cited by 5 publications

References 37 publications

Decapods Associated with the Southern King Crab (Lithodes santolla) Fishery in Central Patagonia (44° S, Chile)

Decapods Associated with the Southern King Crab (Lithodes santolla) Fishery in Central Patagonia (44° S, Chile)

Spatial and temporal stability in the genetic structure of a marine crab despite a biogeographic break

Assessment of Exploitation Intensity of Commercial Species and Associated Benthic Communities, in Chilean Marine Management Areas of North Patagonia

Contact Info

Product

Resources

About