Nicolás Rozbaczylo

Pontificia Universidad Católica de Chile

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Rodrigo A. Moreno

University of Antofagasta

ÓD

Óscar Díaz-Díaz

Universidad de Oriente

Cristián E. Hernández

University of Concepción

Roger D. Sepúlveda

Austral University of Chile

Franklin D. Carrasco

University of Concepción

Oscar Díaz-Díaz

Weatherford College

FABIÁN AVILÉS

Instituto Universitario Puebla

Juan I. Cañete

Universidad Católica del Norte

Marcela Bilbao

Pontificia Universidad Católica de Valparaíso

Marcelo M. Rivadeneira

Universidad Católica del Norte

Cooperative Institutions

Pontificia Universidad Católica de Chile

University of Concepción

University of Chile

Universidad Católica del Norte

Universidad Católica de la Santísima Concepción

Institute of Ecology and Biodiversity

Austral University of Chile

University of Valparaíso

Center of Applied Ecology & Sustainability

Consejo Superior de Investigaciones Científicas

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Preliminary list of nereidae of chile annelida polychaeta

Nicolás Rozbaczylo

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Subtidal macrozoobenthos communities from northern Chile during and post El Niño 1997–1998

Helgoland Marine Research (2007)

Rodrigo A. Moreno Roger D. Sepúlveda Ernesto I. Badano Sven Thatje Nicolás Rozbaczylo

Dominance (genetics)

Global biodiversity

Intermediate Disturbance Hypothesis

10.1007/s10152-007-0095-2

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Citations (18)

Poliquetos de fiordos y canales adyacentes al Campo de Hielo Patagónico Sur, Chile (Annelida: Polychaeta)

Ciencia y tecnología del mar (2004)

Américo Montiel Carlos Ríos Erika Mutschke Nicolás Rozbaczylo

The Polychaetes studied in this paper were collected during two scientific expeditions on board to the AGOR Vidal Gormaz (1995-96) from the Golfo de Penas...

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Aphrodita Bisetosa (Polychaeta : Aphroditidae), A New Species Of Sea Mouse From The Southeastern Pacific Ocean Off Central Chile

Proceedings of the Biological Society of Washington. (2000)

Nicolás Rozbaczylo Elba Canahuire

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Poliquetos asociados con Austromegabalanus psittacus (Molina, 1782) (Crustacea: Cirripedia) en Península Gualpén, Chile central: Biodiversidad y efecto del tamaño del sustrato biológico

Revista de biología marina y oceanografía (2001)

Cristián E. Hernández Gabriela Muñoz Nicolás Rozbaczylo

Resumen.-Se estudió la asociación de poliquetos con el cirripedio Austromegabalanus psittacus en la Península Gualpén (VIII Región, Chile).Se informa y discute la importancia de esta asociación para los ensambles de poliquetos submareales, y se indaga sobre la importancia que tiene el tamaño corporal del cirripedio en la abundancia y biodiversidad de poliquetos.Todos los cirripedios examinados tenían poliquetos, obteniéndose 793 individuos pertenecientes a 19 especies de 12 familias.La mayoría de los poliquetos se encontraron en la parte calcárea de los cirripedios.Los más abundantes y frecuentes fueron Syllidae (Typosyllis sp., Autolytus sp.), Nereididae (Nereis callaona), Spionidae (Polydora sp.), Chrysopetalidae (Paleanotus chrysolepis) y Cirratulidae (Dodecaceria opulens).Se observó que la biodiversidad de poliquetos y la abundancia de Typosyllis sp.aumentan significativamente con el tamaño del cirripedio.La relación entre el tamaño de A. psittacus y la riqueza de poliquetos está determinada por la ecuación potencial (Y = cX z ) que empíricamente describe la conocida relación especies-área en el modelo de equilibrio de MacArthur & Wilson (1963), por lo que los cirripedios se comportarían como islas para los poliquetos asociados.Se discute la importancia de los poliquetos registrados en relación con asociaciones semejantes en otras costas del mundo.

10.4067/s0718-19572001000100009

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Free-living benthic marine invertebrates in Chile

Revista chilena de historia natural (2008)

Matthew R. Lee Juan Carlos Castilla Miriam Fernández Marcela Clarke Catherine Valencia González

A comprehensive literature review was conducted to determine the species richness of all the possible taxa of free-living benthic marine invertebrates in Chile.In addition, the extent of endemism to the Pacific Islands and deep-sea, the number of non-indigenous species, and the contribution that the Chilean benthic marine invertebrate fauna makes to the world benthic marine invertebrate fauna was examined.A total of 4,553 species were found.The most speciose taxa were the Crustacea, Mollusca and Polychaeta.Species richness data was not available for a number of taxa, despite evidence that these taxa are present in the Chilean benthos.The Chilean marine invertebrate benthic fauna constitutes 2.47 % of the world marine invertebrate benthic fauna.There are 599 species endemic to the Pacific Islands and 205 in the deep-sea.There are 25 invasive or non-indigenous species so far identified in Chile.Though the Chilean fauna is speciose there is still a considerable amount of diversity yet to be described, particularly amongst the small bodied invertebrates and from the less well explored habitats, such as the deep-sea.

Marine invertebrates

Endemism

Benthos

10.4067/s0716-078x2008000100005

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Evolutionary drivers of the hump-shaped latitudinal gradient of benthic polychaete species richness along the Southeastern Pacific coast

PeerJ (2021)

Rodrigo A. Moreno Fabio A. Labra Darko D. Cotoras Patricio A. Camus Dimitri Gutiérrez

Latitudinal diversity gradients (LDG) and their explanatory factors are among the most challenging topics in macroecology and biogeography. Despite of its apparent generality, a growing body of evidence shows that 'anomalous' LDG (i.e., inverse or hump-shaped trends) are common among marine organisms along the Southeastern Pacific (SEP) coast. Here, we evaluate the shape of the LDG of marine benthic polychaetes and its underlying causes using a dataset of 643 species inhabiting the continental shelf (<200 m depth), using latitudinal bands with a spatial resolution of 0.5°, along the SEP (3-56° S). The explanatory value of six oceanographic (Sea Surface Temperature (SST), SST range, salinity, salinity range, primary productivity and shelf area), and one macroecological proxy (median latitudinal range of species) were assessed using a random forest model. The taxonomic structure was used to estimate the degree of niche conservatism of predictor variables and to estimate latitudinal trends in phylogenetic diversity, based on three indices (phylogenetic richness (PDSES), mean pairwise distance (MPDSES), and variation of pairwise distances (VPD)). The LDG exhibits a hump-shaped trend, with a maximum peak of species richness at ca. 42° S, declining towards northern and southern areas of SEP. The latitudinal pattern was also evident in local samples controlled by sampling effort. The random forest model had a high accuracy (pseudo-r2 = 0.95) and showed that the LDG could be explained by four variables (median latitudinal range, SST, salinity, and SST range), yet the functional relationship between species richness and these predictors was variable. A significant degree of phylogenetic conservatism was detected for the median latitudinal range and SST. PDSES increased toward the southern region, whereas VPD showed the opposite trend, both statistically significant. MPDSES has the same trend as PDSES, but it is not significant. Our results reinforce the idea that the south Chile fjord area, particularly the Chiloé region, was likely the evolutionary source of new species of marine polychaetes along SEP, creating a hotspot of diversity. Therefore, in the same way as the canonical LDG shows a decline in diversity while moving away from the tropics; on this case the decline occurs while moving away from Chiloé Island. These results, coupled with a strong phylogenetic signal of the main predictor variables suggest that processes operating mainly at evolutionary timescales govern the LDG.

Macroecology

10.7717/peerj.12010

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Citations (12)

ÍNDICE BIBLIOGRÁFICO SOBRE BIODIVERSIDAD ACUÁTICA DE CHILE: POLIQUETOS (ANNELIDA: POLYCHAETA)

Nicolás Rozbaczylo

A bibliographic list of publications about polychaetes found along the Chilean continental coast, Oceanic islands (Easter Island and the Juan Fernandez Archipelago) and Antarctic (South Shetland Islands and Antarctic Peninsula), published from 1849 until now, is presented. References about benthic and holopelagic polychaetes are registered separately. This work shows the rather low number of publications done in Chile about biology and ecology compared with taxonomy in this group. It also shows the low numbers of publications about polychaetes from the Chilean Oceanic Islands and the holopelagic species inhabiting the southeast Pacific Ocean off Chile.

Shetland

Archipelago

Peninsula

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Patterns of endemism in south‐eastern Pacific benthic polychaetes of the Chilean coast

Journal of Biogeography (2006)

Rodrigo A. Moreno Cristián E. Hernández Marcelo M. Rivadeneira Marcela A. Vidal Nicolás Rozbaczylo

Abstract Aim In this study we evaluate patterns of endemism for benthic polychaete species along the southeastern Pacific coast of Chile. Our goals were (1) to describe latitudinal gradients of endemism and identify areas of high endemism, (2) to evaluate the effect of biogeographical limits on endemism patterns, and (3) to evaluate indirectly the role played by evolutionary dynamics on patterns of endemism. Location South‐eastern Pacific coast of Chile, ranging from Arica (18° S) to Cape Horn (56° S). Methods We used a list of 178 species of endemic, shallow benthic polychaetes to evaluate patterns of endemism. Parsimony analysis of endemicity (PAE) and the endemism index (EI) were used to evaluate hierarchical relationships of endemism between different latitudinal bands, and to identify areas with high degrees of endemism and differences in endemism. We evaluated the effect of biogeographical limits on endemic polychaete fauna by testing for the existence of geometric constraints (mid‐domain effect). The role of evolutionary dynamics on latitudinal patterns of endemism was evaluated with nestedness analysis (NA) using the temperature index. Results The PAE analysis indicated two large, separate areas of endemism: (1) the northern area between 18° S and 38° S, and (2) the southern area between 39° S and 56° S. The endemism index showed a maximum value (32 species) around 39°–41° S. Species‐richness curves of each 3° band of latitude showed a clear mid‐domain effect (69%), but the two maximum points of species richness at mid‐latitudes (36° S to 38° S and 39° S to 41° S) did not correspond to the mid‐domain peak in species richness, presenting a greater number of species than expected by the mid‐domain effect. The nestedness analysis showed that the number of genera reaches a maximum of 70 at mid‐latitudes (36°–41° S), decreasing towards both the northern and southern areas. The spatial distribution of the entire data set of endemic species showed a nested pattern ( T ° = 24.5°, P < 0.0001). Main conclusions Our results strongly support the existence of a latitudinal gradient of endemism for benthic polychaete species along the Chilean coast. The shape of this gradient is clearly non‐linear, with a marked peak of endemism occurring at mid‐latitudes (36°–41° S, endemism hotspot), which also corresponds to a peak in species richness. Furthermore, this hotspot is the midpoint separating two distinct areas of endemism to the north and south. We suggest that the observed pattern of endemism for benthic polychaete taxa of the Chilean coast can be explained by a combination of geometric constraints and historical mechanisms, such as the processes that affected the Chilean coast during the Neogene (e.g. ENSO, oxygen minimum zone, glaciations).

Endemism

10.1111/j.1365-2699.2005.01394.x

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Sternaspis chilensis n. sp., a new species from austral Chilean channels and fjords (Annelida, Sternaspidae)

Zootaxa (2017)

Óscar Díaz-Díaz Nicolás Rozbaczylo

Sternaspis chilensis n. sp. is described based on specimens collected in channels and fjords of southern Chile and previously identified as Sternaspis scutata (Ranzani, 1817), originally described from the Meditarrean Sea. Sternaspis chilensis n. sp. is described based on the features of the shield with anterior margins rounded and anterior depression shallow; marginal shield chaetal fascicles arranged with an inverted C-shaped pattern; and distribution of the integument papillae. Sternaspis chilensis is widely distributed in the Magellan Province from Estero Reloncaví (41°32'54"S, 72°19'48"W) to Strait of Magellan (53°34'S, 70°04'W), between 50 and 515 m depth.

Fjord

Spermatheca

10.11646/zootaxa.4254.2.7

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Citations (96)