Spatial distribution in marine invertebrates in rocky shore of Araucania Region (38° S, Chile)

Ríos, Patricio De los; Carreño, Eriko

doi:10.1590/1519-6984.208863

Cited by 5 publications

(4 citation statements)

References 19 publications

(19 reference statements)

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“…This association of an aggregated pattern with negative binomial distribution has been reported by classic literature on benthic fauna [25], as well as by applied entomological studies [22]. The same pattern was reported for inland water crustaceans in Chilean Patagonia [24,26], for intertidal invertebrates on the north Patagonian coast [27], and for the gastropod Echinolittorina peruviana on the rocky shore of Antofagasta [12]. The existence of uniform distribution in four of the 19 sampling events is probably due to interspecific interactions, most likely competition with other species that share the same ecological niche [5][6][7].…”

Section: Discussionsupporting

confidence: 83%

Spatial Distribution of Cyclograpsus cinereus Dana 1851 on the Rocky Shores of Antofagasta (23°27′ S, Chile)

et al. 2022

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The decapod fauna in the intertidal zone of the rocky shores of Chile is highly diverse, especially along the northern and central mainland coasts, where the influence of the cold Humboldt Current results in high productivity. One of the most abundant species in these ecosystems is the decapod Cyclograpsus cinereus Dana, 1851. The aim of the present study, carried out in the spring and summer seasons between 2018 and 2020, was to determine the spatial distribution patterns of the decapod C. cinereus in different sites along the rocky shores of Antofagasta bay, northern Chile, in order to establish probabilistic models that explain its distribution at each site. Individuals were counted in random quadrants in the intertidal zone. The data thus obtained were processed by application of the variance/mean ratio to determine whether the distribution of individuals was random, aggregated or uniform, associated with Poisson, negative binomial or positive binomial distributions, respectively. The data revealed aggregated (negative binomial) distribution in 15 sampling events, and uniform (positive binomial) distribution in 4 events. The sampling sites were located on rocky shores in four sectors of an urban zone, and two in a protected zone; no significant differences were found between the densities of the sites in the two zones. The results of the interpretative probabilistic models indicated aggregated distribution patterns, agreeing with previously reported interpretative probabilistic models for the distribution of decapods on the rocky shores of central and southern Chile.

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Section: Discussionsupporting

confidence: 83%

Spatial Distribution of Cyclograpsus cinereus Dana 1851 on the Rocky Shores of Antofagasta (23°27′ S, Chile)

et al. 2022

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“…Aggregation, recorded in all three taxa here, was documented in Funisia and Parvancorina populations collected from the Ediacara Hills, South Australia (Coutts et al 2018;Mitchell et al 2020). The prevalence of aggregation for many of the White Sea taxa is consistent with modern marine benthic invertebrates, whose populations are often aggregated as a result of reproductive or environmental controls (e.g., Schmidt 1982;Keough 1984;Carlon and Olson 1993;Rodríguez et al 1993;Miron et al 1999;Manríquez and Castilla 2007;Ambroso et al 2013;Hooper and Eichhorn 2016;Lesneski et al 2019;De los Ríos and Carreño 2020;Rodriguez-Perez et al 2020). Furthermore, Charniodiscus and Fractofusus from the Avalon Assemblage and Ernietta from the Nama Assemblage in Namibia (Gibson et al 2019(Gibson et al , 2021Mitchell et al 2019) have been shown to exhibit aggregation, indicating that this spatial pattern was present, or even common, throughout the Ediacara Biota.…”

Section: Discussionsupporting

confidence: 67%

Spatial distributions of Tribrachidium, Rugoconites, and Obamus from the Ediacara Member (Rawnsley Quartzite), South Australia

Boan¹,

Evans²,

Hall³

et al. 2023

Paleobiology

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The spatial distribution of in situ sessile organisms, including those from the fossil record, provides information about life histories, such as possible dispersal and/or settlement mechanisms, and how taxa interact with one another and their local environments. At Nilpena Ediacara National Park (NENP), South Australia, the exquisite preservation and excavation of 33 fossiliferous bedding planes from the Ediacara Member of the Rawnsley Quartzite reveals in situ communities of the Ediacara Biota. Here, the spatial distributions of three relatively common taxa, Tribrachidium, Rugoconites, and Obamus, occurring on excavated surfaces were analyzed using spatial point pattern analysis. Tribrachidium have a variable spatial distribution, implying that settlement or post-settlement conditions/preferences had an effect on populations. Rugoconites display aggregation, possibly related to their reproductive methods in combination with settlement location availability at the time of dispersal and/or settlement. Additionally, post-settlement environmental controls could have affected Rugoconites on other surfaces, resulting in lower populations and densities. Both Tribrachidium and Rugoconites also commonly occur as individuals or in low numbers on a number of beds, thus constraining possible reproductive strategies and environmental/substrate preferences. The distribution of Obamus is consistent with selective settlement, aggregating near conspecifics and on substrates of mature microbial mat. This dispersal process is the first example of substrate-selective dispersal among the Ediacara Biota, thus making Obamus similar to numerous modern sessile invertebrates with similar dispersal and settlement strategies.

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“…Field works and study site: the ten sites are located in the coastal town of Antofagasta, northern Chile, six sites are located within town, whereas as external group, was included a four sites in a rocky shore located at 20 km of the town, with low or practically null human intervention (Figure 1, Table 1). The studied sites were visited in summer 2019, for each site, was thrown out random (Ríos and Arancibia, 2018; Ríos and Carreño, 2020), 10 * 10 cm quadrants (n = 40 for each site), considering the relative small size of considered species (Underwood, 2004;Underwood and Chapman, 2005;Ahmad et al, 2011;Ríos and Carreño, 2020).…”

Section: Methodsmentioning

confidence: 99%

Spatial distribution of Echinolitorina peruviana (Lamarck, 1882) for intertidal rocky shore in Antofagasta (23° S, Chile).

et al. 2023

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The intertidal rocky shores in continental Chile have high species diversity mainly in northern Chile (18-27° S), and one of the most widespread species is the gastropod Echinolittorina peruviana (Lamarck, 1822). The aim of the present study is do a first characterization of spatial distribution of E. peruviana in along rocky shore in Antofagasta town in northern Chile. Individuals were counted in nine different sites that also were determined their spectral properties using remote sensing techniques (LANDSAT ETM+). The results revealed that sites without marked human intervention have more abundant in comparison to sites located in the town, also in all studied sites was found an aggregated pattern, and in six of these sites were found a negative binomial distribution. The low density related to sites with human intervention is supported when spectral properties for sites were included. These results would agree with other similar results for rocky shore in northern and southern Chile.

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Spatial distribution in marine invertebrates in rocky shore of Araucania Region (38° S, Chile)

Cited by 5 publications

References 19 publications

Spatial Distribution of Cyclograpsus cinereus Dana 1851 on the Rocky Shores of Antofagasta (23°27′ S, Chile)

Spatial Distribution of Cyclograpsus cinereus Dana 1851 on the Rocky Shores of Antofagasta (23°27′ S, Chile)

Spatial distributions of Tribrachidium, Rugoconites, and Obamus from the Ediacara Member (Rawnsley Quartzite), South Australia

Spatial distribution of Echinolitorina peruviana (Lamarck, 1882) for intertidal rocky shore in Antofagasta (23° S, Chile).

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