Non randomness in spatial distribution in two inland water species malacostracans

Escalante, Patricio De los Ríos

doi:10.1016/j.jksus.2016.12.002

Cited by 13 publications

(5 citation statements)

References 21 publications

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“…This association of aggregated pattern and negative binomial distribution has been reported by classic literature about benthic fauna (25), as well as applied entomological studies (22). This pattern was reported for inland water crustaceans in Chilean Patagonia (24,26), for intertidal invertebrates in northern Patagonian coast (27), and the gastropod Echinolittorina peruviana in Antofagasta rocky shore (12). The existence of uniform distribution in four of 19 samples probably would be to interspecific interactions, probably competence with other species that share ecological niche (5,6,7).…”

Section: Discussionsupporting

confidence: 74%

“…Data analysis: in a first step, it was compared the C. cinereus abundances for each site, and for two groups of sites (protected and human altered sites), homocedasticity and normality were determined for data, and due the absence of both conditions it was done a non-parametric tests [15] To each specie counting data, was obtained in first instance a variance mean ratio, first for determine if the specie has random if the value is 1, uniform if the value is lower than 1, or aggregated distribution, if the value is upper than 1, [22,23,24]. Once determined the spatial pattern, random, uniform or aggregated, it determined if the species have Poisson, binomial or negative binomial distribution respectively, the analysis was done manually using Excel software and literature descriptions [22,23,24].…”

Section: Methodsmentioning

confidence: 99%

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Spatial Distribution of <em>Cyclograpsus cinereus</em> Dana 1851 in Rocky Shores of Antofagasta (23º27’ S, Chile)

Ríos¹,

Esse²,

Retamal³

et al. 2022

Preprint

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The decapod fauna in intertidal rocky shore in continental Chile has high species diversity mainly in northern and central Chile due high productivity of these coast due influence of cold Humboldt stream. One of the abundant species in these ecosystems is decapod Cyclograpsus cinereus Dana, 1851. The aim of the present study was determine the spatial distribution pattern of C. cinereus along rocky shore in Antofagasta bay, north of Chile between spring and summer 2018-2020. Data was obtained counting individuals from random quadrants in intertidal zones, to the obtained data was applied the variance mean ratio for determine if the specimens have random, aggregate or uniform distribution, that are associated to Poisson, negative binomial or positive binomial distributions respectively. Data obtained revealed the existence of associated distribution with respective negative binomial distribution pattern in 16 observations, and uniform distribution for 3 observations. The sites corresponds to rocky shores in urban zones, and in a protected zone, and the density does not have significant differences for both kind of sites. The observed data about aggregated pattern agree with observations for decapods for rocky shore in central and southern Chile, specifically in interpretative probabilistic models.

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Section: Discussionsupporting

confidence: 74%

Section: Methodsmentioning

confidence: 99%

Spatial Distribution of <em>Cyclograpsus cinereus</em> Dana 1851 in Rocky Shores of Antofagasta (23º27’ S, Chile)

Ríos¹,

Esse²,

Retamal³

et al. 2022

Preprint

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“…Th e results about the presence of negative binomial distribution in P. minutus and N. morio agree with similar observations for inland waters crustacean and mollusks (De los Ríos-Escalante & Mansilla, 2017), that would be explained as survival strategies such as et al, 2019). Finally the absence of negative binomial distribution pattern observed for N. pyramidalis pascua can be possible, considering that aggregated pattern is not obligatory associated with negative binomial distribution (Elliot, 1999;Fernandes et al, 2003;De los Ríos-Escalante, 2017) Th is result is the fi rst ecological community view point for Easter Island coastal marine communities. In this scenario, the marked diff erence in mollusks species composition in two data sets, is similar to observations on intertidal crustaceans in the same site in 2010 (De los Ríos-Escalante, 2011), that were absent in fi eld observations in 2014 (De los Ríos-Escalante & Ibáñez-Arancibia, 2017).…”

Section: Resultsmentioning

confidence: 99%

“…Fernandez et al (2014) did a detailed reviewing about marine invertebrates on Easter Island, but they do not specify more details about specifi c sites within the Island. One of the groups with more references are mollusks (Rehder, 1980;Osorio & Cantuarias, 1989;Brook, 1998;Letelier et al, 2003;Coloma et al, 2004;Dell'Angelo et al, 2004;Raines, 2004Raines, , 2007 and decapod crustaceans (Retamal, 2004;De los Ríos-Escalante, 2011;De los Ríos-Escalante & Ibáñez-Arancibia, 2016, 2017, with more studies based on single records. From these studies only Coloma et al (2004) did a more restricted research based on abundances in intertidal environments including abundances for reported species, but without more ecological analysis.…”

Section: Introductionmentioning

confidence: 99%

Niche Sharing in Intertidal Mollusks and Decapods in Rocky Shore of Easter Island

Ríos

Arancibia

2019

Vestnik Zoologii

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The coastal marine ecosystems in Easter Island have been poorly studied, and the main studies were isolated species records based on scientific expeditions. The aim of the present study is to apply a spatial distribution analysis and niche sharing null model in published data on intertidal marine gastropods and decapods in rocky shore in Easter Island based in field works in 2010, and published information from CIMAR cruiser in 2004. The field data revealed the presence of decapods Planes minutus (Linnaeus, 1758) and Leptograpsus variegatus (Fabricius, 1793), whereas it was observed the gastropods Nodilittorina pyramidalis pascua Rosewater, 1970 and Nerita morio (G. B. Sowerby I., 1833). The available information revealed the presence of more species in data collected in 2004 in comparison to data collected in 2010, with one species markedly dominant in comparison to the other species. The spatial distribution of species reported in field works revealed that P. minutus and N. morio have aggregated pattern and negative binomial distribution, L. variegatus had uniform pattern with binomial distribution, and finally N. pyramidalis pascua, in spite of aggregated distribution pattern, had not negative binomial distribution. Finally, the results of null model revealed that the species reported did not share ecological niche due to competition absence. The results would agree with other similar information about littoral and sub-littoral fauna for Easter Island.

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“…Alterations in the continuity of water flow and sudden increase in flow; and the destruction of native forest due to fires, or in favour of agriculture of plantations, which significantly affects nutrient cycles and the dynamics of aquatic communities (López-Rojo et al, 2019). On this basis, it would be necessary more ecological studies, that involves habitats density in different ecosystems for understand its behaviour such as has been described for other species of Aegla genus (De los Ríos-Escalante, 2017;De los Ríos-Escalante et al, 2019). Also, it is necessary more studies about distribution of Aegla genus considering their biogeography at regional scales (De los Ríos-Escalante et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Extension of the known distribution range and habitat use of the Tiger Crab Aegla concepcionensis Schmitt, 1942 (Decapoda, Aeglidae)

Correa-Araneda¹,

Jaque-Jaramillo²,

Esse³

et al. 2022

Limnetica

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Extension of the known distribution range and habitat use of the Tiger Crab Aegla concepcionensis Schmitt, 1942 (Decapoda, Aeglidae)The tiger crab Aegla concepcionensis Schmitt, 1942 (Decapoda, Aeglidae) is a threatened freshwater decapod, endemic of Chile, with significant gaps in knowledge about its biology and ecology. The aim of this work was to contribute to the knowledge of the ecology of A. concepcionensis, through the extension of its known distribution range, recorded in a new type of ecosystem, and the description of the physicochemistry, vegetation and benthic macroinvertebrate and microalgal communities of those sites, which provides information about habitat use of the species. Our results show the presence of A. concepcionensis until 270 km south of the previously described range and reveal that the species inhabits streams and lakes. A. concepcionensis is associated to environments with cold and temperate waters, well oxygenated, with neutral pH and low conductivity, and characterized by low anthropic intervention, which is reflected in the high proportion of native riverine plant species and the high diversity of macroinvertebrate and microalgal benthic communities. We conclude that the previously restricted known distribution range of this species was mainly due to low sampling effort or misidentifications. Our results indicate that anthropic intervention should be avoided or minimized in the distribution area of A. concepcionensis, especially in those areas associated with urban expansion and touristic activities in streams and lakes.

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Non randomness in spatial distribution in two inland water species malacostracans

Cited by 13 publications

References 21 publications

Spatial Distribution of <em>Cyclograpsus cinereus</em> Dana 1851 in Rocky Shores of Antofagasta (23º27’ S, Chile)

Spatial Distribution of <em>Cyclograpsus cinereus</em> Dana 1851 in Rocky Shores of Antofagasta (23º27’ S, Chile)

Niche Sharing in Intertidal Mollusks and Decapods in Rocky Shore of Easter Island

Extension of the known distribution range and habitat use of the Tiger Crab Aegla concepcionensis Schmitt, 1942 (Decapoda, Aeglidae)

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