Marcelo M. Rivadeneira

Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile

As a biotic interaction, drilling predation is affected by the evolutionary histories of the predator and prey, as well as the environment. A unique location with distinctive evolutionary histories and environmental conditions is the remote island of Rapa Nui. For mollusks, an evolutionary history in relative isolation has led to high rates of ende...

El norte de Chile es caracterizado por poseer localidades con un abundante registro fósil de vertebrados marinos, en especial de peces óseos y cartilaginosos. Sin embargo, la totalidad de los estudios han estado solo enfocados en restos de tamaño superior a 1 cm, excluyendo el material de menor tamaño. El objetivo de este estudio es identificar res...

El gran tiburón blanco (Carcharodon carcharias) es uno de los depredadores tope más emblemáticos que existen en nuestro planeta. Esta especie de tiburón cumple un rol de estructurador de comunidades, ya que puede controlar la abundancia de otras especies que consume como parte de su dieta. Una de las grandes problemáticas que afronta nuestro planet...

Worldwide climate-driven shifts in the distribution of species is of special concern when it involves habitat-forming species. In the coastal environment, large Laminarian algae – kelps – form key coastal ecosystems that support complex and diverse food webs. Among kelps, Macrocystis pyrifera is the most widely distributed habitat-forming species a...

Despite the rich fossil record of Neogene chondrichthyans (chimaeras, sharks, rays, and skates) from Europe, little is known about the macroevolutionary processes that generated their current diversity and geographical distribution. We compiled 4368 Neogene occurrences comprising 102 genera, 41 families , and 12 orders from four European regions (A...

Understanding latitudinal variations in biodiversity is central for biogeography. Along the coasts of the Southeast Pacific, several taxa show inverse latitudinal patterns of biodiversity, i.e. increasing species numbers from lower to higher latitudes. A plausible explanation for these patterns is that fjords, formed during the Pleistocene glaciati...

El registro fósil de elasmobranquios (tiburones y rayas) es ampliamente conocido en diferentes partes del mundo. La gran mayoría de los estudios están enfocados en la descripción e identificación de fósiles con un tamaño superior a 1 cm (macrofósiles). Trabajos que usen especímenes fósiles con un tamaño inferior a 1 cm (microfósiles) no han sido ab...

La estimación de las tasas de originación, extinción y sus cambios a través del tiempo es crucial para comprender los patrones de diversidad que moldean la historia evolutiva de los taxa. A pesar del rico registro fósil, el creciente esfuerzo de muestreo y las nuevas descripciones en el Pacifico de Sudamérica, pocos estudios han abordado esta temát...

Durante el Neógeno de Chile ocurren intensos eventos geológicos, oceanográficos, y climáticos, que influyeron en la fauna marina desde ese periodo hasta la actualidad. Estudios enfocados en la evaluación del efecto de estos eventos sobre la diversidad de mamíferos, aves y tiburones han sido previamente abordados. Sin embargo, las interacciones de e...

La globalización de la información ha permitido la utilización de bases de datos públicas con el fin de realizar análisis y creación de modelos, una tendencia que gana cada vez más espacio en las ciencias naturales. Paleobiology Database (PBDB) (http://paleobiodb.org/), es una base de datos de uso público, el cual mediante un registro de usuario, p...

El yacimiento paleontológico Serviu se encuentra emplazado al interior de la ciudad de Caldera, caracterizado por sedimentos marinos neógenos cuaternarios correspondientes a la Formación Bahía Inglesa y los Estratos de Caldera en un fuerte contacto erosivo. Se han reconocido 4 unidades distribuidas de base de techo EA, E1, E2 y E3. La primera unida...

Seabirds are top predators in coastal and pelagic ecosystems that forage at sea but return to land regularly during the breeding season (i.e., central place foragers). This unique life history strategy is directly related to their biological traits and helps define their role as top predators in marine systems. We analysed the effects of physiograp...

As quantitative tools, drill holes have been used to calculate predation frequencies in time and space. These traces can also inform predator preference and some strategies predators use to drill on prey (e.g., edge drilling, site stereotypy, or alternative modes of predation when there is no drill hole). In this study, our goal was to leverage the...

The Humboldt Current Marine Ecosystem (HCE) is one of the most productive areas in the global ocean, but current anthropogenic stressors, particularly overfishing, pose a significant threat to marine biodiversity. Moreover, the limited time scale of modern assessments may underestimate the magnitude of human alterations to marine biodiversity. Here...

El presente informe presenta la descripción de un total de 36 riesgos en 10 sectores diferentes fueron descritos desde la plataforma ARClim y descritos para la Región de Coquimbo. Adicionalmente, se estimaron valores relativos de riesgo climático y de los factores subyacentes mediante la construcción de 18 nuevas cadenas de impacto de amenazas clim...

Patterns of species richness and their structuring forces at multiple scales provide a critical context for research efforts focusing on ecology, evolution, and conservation. Diversity gradients have been demonstrated in tropical reef fish, but corresponding patterns and mechanisms remain poorly understood in temperate regions. We conducted hierarc...

La Formación Bahía Inglesa (BIfm) está compuesta por sedimentos marinos del Mioceno-Pleistoceno con niveles ricos en vertebrados e invertebrados fósiles. A pesar de que en los últimos años se han realizado estudios para describir la taxonomía y los ensambles de peces, existe la necesidad de contextualizarlos en las diferentes unidades estratigráfic...

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...

There is ongoing debate as to whether fish body size will decrease with global warming and how these changes may impact dispersal ability and speciation rate. Theory predicts that, under warmer temperatures, fish grow to a smaller size, undergo a reduction in dispersal ability and increase speciation rates. However, evaluations of such predictions...

Despite being one of the richest Neogene deposits of marine fossil vertebrates along the Pacific coast of South America, no detailed study of bony fishes from the Bahía Inglesa Formation has been carried out. Through the revision of historical collections of the Caldera Paleontological Museum, we describe 27 fossil remains of bony fishes. Fossils d...

El enfoque de las fortalezas familiares sugiere que las familias son capaces de surgir y salir exitosas de los desafíos de la vida cotidiana. Teniendo esto en cuenta, el objetivo de este estudio fue validar la Escala de Fortalezas Familiares, adaptada de un estudio en España, en una población chilena. Para esto, la muestra estuvo formada por 324 ad...

Using 19 years of remotely sensed Enhanced Vegetation Index (EVI), we examined the effects of climatic variability on terrestrial vegetation of six protected areas along southwestern South America, from the semiarid edge of the Atacama desert to southern Patagonia (30°S-51°S). The relationship between satellite phenology and climate indices, namely...

The Bahía Inglesa and Coquimbo formations (Miocene-Pleistocene in age), located at the southern coast of the Atacama Desert, include some of the most important and richest marine fossiliferous sites in Chile. Both formations are geographically adjacent, and have been subject of sedimentologic and stratigraphic studies since more than 150 years. Pre...

Most burrowing shrimps (infraorder Axiidea and Gebiidea) are characterized by solitary habits, which led many of these species to evolve a remarkable sexual dimorphism both in body size and chelipeds because of sexual selection. Given that monogamous species are known to live in heterosexual pairs and exhibit a low degree of sexual dimorphism, it i...

We present the first fossil record of the sawshark genus Pliotrema from the south-eastern Pacific Ocean. The examined material was obtained from a little-known fossil locality named “Arenas de Caldera” in the Atacama region of Chile. The fossiliferous deposits belong to the Bahía Inglesa Formation, which is most likely middle Miocene–early Pliocene...

The direct carbonate procedure for accelerator mass spectrometry radiocarbon (AMS ¹⁴ C) dating of submilligram samples of biogenic carbonate without graphitization is becoming widely used in a variety of studies. We compare the results of 153 paired direct carbonate and standard graphite ¹⁴ C determinations on single specimens of an assortment of b...

Aim: Despite the generality of the latitudinal gradient of species diversity (LDG) phenomenon , there is growing evidence showing deviations from an idealized pattern, that is, a single peak of species richness symmetrically centred in the Equator, but the underlying causes remain little studied. We here evaluate the existence of departures from th...

This study aims at synthesizing the recent invasion history of Carcinus maenas in the SW Atlantic (~20 years), particularly the northward expansion, based on available published papers, technical reports, and new field surveys. Our analyses extend the known distribution range northwards ca. 330 km. totaling ~1000 km along the Argentinean coast sinc...

There is an ongoing debate as to whether fish body size will decrease with global warming and how body size changes may impact dispersal abilities and speciation rates. Although theory predicts that, when fish face warmer temperatures, they grow to smaller adult sizes, see a reduction in their ability to move, and increase their probability of spec...

1. While floating near the sea surface plastic debris interacts with a number of external factors, including many different organisms. Seabirds have the most extensive documented history of interactions with plastics, through ingestion, entanglement, and nest construction. 2. In the present study, eight seabird species from the South Pacific Ocean...

Aim For seabirds, food supplies and nest sites are largely driven by oceanographic gradients and island habitats, respectively. Research into seabirds’ ecological roles in insular ecosystems is crucial to understanding processes that structure seabird nesting assemblages. We examined the influence of island physiography and oceanographic factors on...

The latitudinal diversity gradient (LDG) is a phenomenon acknowledged for over two centuries. The LDG of marine crustaceans has been studied often but without reaching consensus on its ultimate causative processes. We have undertaken a new synthesis to assess the generality of the LDG and evaluated how potential sampling and other biases, spatial s...

Urban development modifies the habitat of reptiles where we expect, the individuals to select available sites with the quality necessary for their permanence. The aim of this study was to determine the variables that favored the habitat selection and abundance of The Zapallaren Tree Iguana Liolaemus zapallarensis, an endemic species of Chile, durin...

Elasmobranch remains are quite common in Miocene deposits and were the subject of numerous studies since the middle of the nineteenth century. Nevertheless, the taxonomic diversity of the Marine Molasse sharks, rays and skates is still largely unknown. Here, we describe 37 taxa from the lower Miocene of the Molasse Basin: 21 taxa could be identifie...

Symbiosis and coloniality are ecologically important traits for corals of the order Scleractinia. Symbiotic (zooxanthellate) species are highly successful in shallow waters of tropical and subtropical seas and most of them are colonial. On the other hand, azooxanthellate species present wide distribution ranges and expand to the deep-sea at more th...

Shark nurseries are essential habitats for shark survival. Notwithstanding the rich fossil record of the modern great white shark (Carcharodon carcharias, GWS), its use of nursery areas in the fossil record has never been assessed before. Here, we analysed the fossil record of the GWS from three South American Pliocene localities, assessed body siz...

Background: There is a biogeographic break located at 30°S in the southeast Pacific, in a coastal area of strong environmental discontinuities. Several marine benthic taxa with restricted dispersal have a coincident phylogeographic break at 30°S, indicating that genetic structure is moulded by life history traits that limit gene flow and thereby p...

The social groups that initially inhabited the hyper arid core of the Atacama Desert of northern Chile during the late Pleistocene integrated a wide range of local, regional and supra regional goods and ideas for their social reproduction as suggested by the archaeological evidence contained in several open camps in Pampa del Tamarugal (PdT). Local...

The formation and maintenance of biogeographic regions and the latitudinal gradient of species richness are thought to be influenced, in part, by the spatial distribution of physical habitat (habitat continuity). But the importance of habitat continuity in relation to other variables for shaping richness gradients and delimiting biogeographic regio...

Aim: We assess the spatial distribution of a suite of coastal biophysical characteristics and how their variability is related to the distribution and geographic range of a diverse assemblage of coastal benthic species with different larval dispersal strategies. Location: South-eastern Pacific (SEP) coast between 18°20’S and 42°35’S. Methods: Bioph...

The biogeography of the Peruvian Eastern Pacific coast has been described based on oceanographic parameters and qualitative species occurrence data. This has generated disagreement about the limits and existence of different biogeographic units. In this study, the distribution of rocky-shore macrobenthic communities were recorded over 41 sites alon...

Variables analyzed using Random Forest. (DOC)

Complete abundance list of taxa recorded in this study. (XLSX)

Complete presence list of taxa recorded in this study. (XLSX)

Broad-scale latitudinal morphological trends in gastropods along the southwestern Atlantic coast are scant, since the majority of studies have focused on local scales. Here, we evaluate biogeographic shell shape variation in the marine gastropod Trophon geversianus across most of its distributional range, covering 14 degrees of latitude. Samples co...

Los ensambles de peces fósiles han demostrado tener un potencial como indicadores ambientales y biogeográficos del pasado geológico. Además, determinados taxa han sido también considerados como posibles marcadores bioestratigráficos a nivel regional y mundial. Por estas razones, el estudio de la paleoictiofauna marina del Neógeno y Cuaternario de C...

Horn sharks (Elasmobranchii: Heterodontus Blainville) correspond to a genus of chondrichthyan fishes, mostly distributed in warmtemperate to tropical regions of the Pacific and Indian Oceans. The fossil record shows that, in contrast to its current distribution, horn sharks were widely distributed both in the eastern Pacific and western Atlantic du...

Aim: This study examines how rafting on floating bull kelps can shape the biogeographic patterns of raft-associated species, and analyses the spatio-temporal variability of taxonomic richness and co-occurrences of epibionts on beach-cast rafts of Durvillaea antarctica along a latitudinal gradient. Location: Southeast Pacific, along ~1,700 km of coa...

Among the earliest macroecological patterns documented, is the range and body size relationship, characterized by a minimum geographic range size imposed by the species' body size. This boundary for the geographic range size increases linearly with body size and has been proposed to have implications in lineages evolution and conservation. Neverthe...

The environmental transformations that occurred during the Neogene had profound effects on spatiotemporal biodiversity patterns, yet the modulating role of traits (i.e., physiological, ecological, and life-history traits) remains little understood. We tested this idea using the Neogene fossil record of chondrichthyans along the temperate Pacific co...

Seabirds have been traditionally excluded from any attempt to produce bioregions at global scales. In this work, for the first time, we make a global classification of bioregions based on the distribution at sea of 359 species of seabirds. To identify these bioregions (geographically distinct assemblages of species and communities) we employ a new...

The environmental transformations that occurred during the Neogene had profound effects on spatiotemporal biodiversity patterns, yet the modulating role of traits (i.e., physiological, ecological, and life-history traits) remains little understood. We tested this idea using the Neogene fossil record of chondrichthyans along the temperate Pacific co...

[This corrects the article DOI: 10.1371/journal.pone.0187140.].

PPEE is the penultimate global biodiversity crisis associated with drastic changes in ocean circulation patterns and marine productivity. However, the consequences of the PPEE across hemispheres remained unexplored. We evaluate how the energy use and guild structure of North (Florida) and South American (Chile) gastropod species assemblages are mod...

Seasonal and geographic variations in carrageenan biosynthesis influence the commercial value and industrial applications of these phycocolloids due to the variation in yield and quality. This study examined the effects of season and seaweed origin on the carrageenans produced by the isomorphic phases of the red alga Chondracanthus chamissoi collec...