Juan Jose Alvarado

Juan Jose Alvarado
University of Costa Rica | UCR · Centro de Investigación en Ciencias del Mar y Limnología (CIMAR)

PhD.

About

124
Publications
62,351
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1,962
Citations
Citations since 2017
40 Research Items
1139 Citations
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2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
Additional affiliations
July 2012 - present
University of Costa Rica
Position
  • Research Associate
July 2012 - present
Escuela de Biología
Position
  • Professor

Publications

Publications (124)
Presentation
Full-text available
In this work, we undertook the task of compiling the available information in the literature and museum collections about deep-sea echinoderms collected in Costa Rica. In this way, we are aiming to have a better understanding of the deep-sea fauna contribution to the total echinoderm diversity in Costa Rican waters. Likewise, to be able to identify...
Article
Full-text available
Echinoderms are a highly diverse group and one of the most conspicuous in the deep sea, playing ecological key roles. We present a review about the history of expeditions and studies on deep-sea echinoderms in Costa Rica, including an updated list of species. We used literature and information gathered from the databases of the California Academy o...
Article
Full-text available
Coral reefs in Culebra Bay (North Pacific of Costa Rica) are threatened by multiple anthropogenic disturbances including global warming, overfishing, eutrophication, and invasive species outbreaks. It is possible to assist their recovery by implementing ecological restoration techniques. This study used artificial hexagonal steel structures, called...
Technical Report
Full-text available
Chapter 12. Status and trends of coral reefs of the Caribbean region, pp. 1-25. In: Souter, D., Planes, S., Wicquart, J., Logan, M., Obura, D., & Staub, F. (Eds.) Status of Coral Reefs of the World: 2020. Global Coral Reef Monitoring Network, International Coral Reef Iniciative, Australian Institute of Marine Science, & Australian Governement.
Article
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Decapod crustaceans are a diverse group that exploits various types of habitats in Costa Rica, where they represent 8.1% of the marine diversity of the country. This group includes families containing species with strictly symbiotic behavior, e.g., the Palaemonidae and Pinnotheridae. Despite the high diversity of decapods and the importance of symb...
Article
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Introduction: Central America, a narrow strip of land dividing the Atlantic and Pacific oceans, has a high diversity of marine and terrestrial species. Echinoderms are one of the most diverse marine groups with 420 reported species. Objective: To summarize echinoderm research in Central America. Methods: We compiled the literature from SCOPUS, Web...
Article
Full-text available
The ecology of the marine environments of the Murciélago Islands and the Santa Elena Peninsula have been studied little despite their high biodiversity. This area is influenced by a coastal upwelling. In 2014, 2016 and 2018, the region was visited to assess the composition and diversity of its reef environments. Bottom coverage, macroinvertebrate d...
Article
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Introduction: Worldwide, coastal habitats are experiencing increasing pressure from pollution, coastal development, fisheries, and climate change. Identifying and recording coastal biodiversity is essential to assess ecosystem health, changes and the extent of biodiversity loss. Coastal tropical habitats such as coral reefs and seagrass beds have b...
Article
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Introduction: The class Ascidiacea has about 3 000 species, which fulfill various roles in the ecosystem, for example, they filter high amounts of particles, and are shelter and food for other animals. Furthermore, the group has a high number of invasive species reported. In Costa Rica, ascidians have been barely studied. Objective: In this study,...
Article
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Introducción: Los hábitats costeros de todo el mundo están experimentando una presión cada vez mayor debido a la contaminación, el desarrollo costero, la pesca y el cambio climático. Identificar y registrar la biodiversidad costera es esencial para evaluar la salud, los cambios y el alcance de la pérdida de biodiversidad de los ecosistemas. Los háb...
Article
Full-text available
Introduction: The class Ascidiacea has about 3 000 species, which fulfill various roles in the ecosystem, for example, they filter high amounts of particles, and are shelter and food for other animals. Furthermore, the group has a high number of invasive species reported. In Costa Rica, ascidians have been barely studied. Objective: In this study,...
Article
Full-text available
The cryptofauna are the small cryptic organisms that inhabit the interstices of coral colonies and have a great contribution to the biodiversity of the reef. Some of these species are vulnerable to environmental deterioration due to their dependency on living coral. In the 1990s, Culebra Bay, located in the North Pacific of Costa Rica, was consider...
Article
Full-text available
Introduction: The study of the marine diversity of the North Pacific of Costa Rica began with isolated foreign expeditions in the 1930s and was systematically developed in the mid-1990s by the Center for Research in Marine Sciences and Limnology, Universidad de Costa Rica, as consequence there are now a total of 1 479 reported species in this regio...
Article
Full-text available
Introduction: The study of the marine diversity of the North Pacific of Costa Rica began with isolated foreign expeditions in the 1930s and was systematically developed in the mid-1990s by the Center for Research in Marine Sciences and Limnology, Universidad de Costa Rica, as consequence there are now a total of 1 479 reported species in this regio...
Article
It is a pleasure for us to present this compendium that represents the sixth product of publications of the Iberoamerican Echinoderm Network (RIE), corresponding to 40 scientific papers presented at the Fourth Latin American Conference of Echinoderms, held from November 10th to 15th 2019 in the city of La Paz, Baja California Sur, Mexico. These wor...
Article
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Fishes play numerous key ecological roles that are critical for maintaining the structure and function of coral reefs. Natural and anthropogenic disturbances can produce structural changes in coral reef habitats, which consequently may affect the trophic structure and dynamics of reef fish assemblages. Therefore, changes in the coral cover of coral...
Article
The ecology of the marine environments of the Murciélago Islands and the Santa Elena Peninsula have been studied little despite their high biodiversity. This area is influenced by a coastal upwelling. In 2014, 2016 and 2018, the region was visited to assess the composition and diversity of its reef environments. Bottom coverage, macroinvertebrate d...
Article
Pentamera fonsecae n. sp. is described from seven specimens as a new species of Thyonidae from the Pacific coast of Costa Rica. It is distinguished from its congeners by having tables with ladder-shaped spires in the body wall, and tube feet with curved support tables of variable height and tables as those found in the body wall slightly smaller th...
Article
Population parameters of Diadema mexicanum have not yet been studied; therefore, the objective of this work was to describe, for the first time, the growth and mortality by age of this sea urchin. The growth curve was determined by applying a modal progression analysis of the length-frequency distribution sample to determine the number of cohorts p...
Article
Full-text available
Introduction: El Niño 2015-2016 was considered one of the most severe worldwide, causing the third global event of coral bleaching. Previous high-intensity El Niño events (1982-83 and 1997-98) caused high coral mortalities and deterioration of coral reef structures along the Eastern Tropical Pacific, affecting both ecosystem and associated economic...
Article
Full-text available
The Caribbean is considered a unique biogeographic region that represents an important hotspot of marine diversity in the Atlantic Ocean. The Caribbean Continental Slope of Central America (CCCA) is a largely unexplored area that exhibits a variety of habitats. Among this unstudied biodiversity, special importance has been given to the benthic comm...
Article
Full-text available
Studies of mixed-species groups of animals can reveal emergent complexities of collective behaviors. In this study we collected data on mixed-species hunting groups composed primarily of piscivorous fishes (species composition, abundance, behavioral interactions) and used both multivariate and network analyses to quantify pair-wise and guild level...
Article
In recent years, there has been a health decrease in marine ecosystems. Due to this accelerated degradation, there is a more pressing need to investigate the effectiveness of MPAs in these degraded zones. In this work, we evaluate the effect of MPAs over species richness, biomass and size of reef fishes. The sampling was conducted in 31 sites in th...
Article
Isla del Coco (Costa Rica) forms part of the five oceanic islands of the Eastern Tropical Pacific and is well known for its high biodiversity and great endemism. While several marine biological and oceanographical surveys have been conducted around the island over the past 35 years, an integrated, systematic view of the shallow water system is lack...
Article
Benthic structure of coral reefs determines the availability of refuges and food sources. Therefore, structural changes caused by natural and anthropogenic disturbances can have negative impacts on reef‐associated communities. During the 1990s, coral reefs from Bahía Culebra were considered among the most diverse ecosystems along the Pacific coast...
Article
Full-text available
Diversity patterns are determined by biogeographic, energetic, and anthropogenic factors, yet few studies have combined them into a large‐scale framework in order to decouple and compare their relative effects on fish faunas. Using an empirical dataset derived from 1527 underwater visual censuses (UVC) at 18 oceanic islands (five different marine p...
Article
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When conservation can keep up with development´s pace: Health status of coral ecosystems in the North Pacific of Costa Rica. Coral reefs are diverse and productive ecosystems, despite this, they are being threatened by human activities that enhance the detrimental impact of the natural phenomenon's like Harmful Algal Blooms (HAB). The north Pacific...
Article
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New record of the starfish Ophidiaster ludwigi (Echinodermata: Asteroidea) from the Pacific of Mexico and Costa Rica. Ophidiaster ludwigi had been reported only from Panama and Peru. Here we add record of the genus and species for Mexico and Costa Rica; and, first time its bathymetric distribution (0-156 m). Rev. Biol. Trop. 65(Suppl. 1): S253-S257...
Article
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Echinoderms from the Museum of Zoology from the Universidad de Costa Rica. The Museum of Zoology, Universidad de Costa Rica (MZUCR) was founded in 1966 and houses the most complete collection of vertebrates and invertebrates in Costa Rica. The MZUCR currently has 24 collections containing more than five million specimens, and more than 13 000 speci...
Chapter
Advances in our knowledge of eastern tropical Pacific (ETP) coral reef biogeography and ecology during the past two decades are briefly reviewed. Fifteen ETP subregions are recognized, including mainland and island localities from the Gulf of California (Mexico) to Rapa Nui (Easter Island, Chile). Updated species lists reveal a mean increase of 4.2...
Article
Full-text available
Echinoderms within the Eastern Tropical Pacific have mainly been studied in association with coral reefs. Investigations on echinoderms associated with soft-bottoms and estuaries are still scarce. The present study reports on the echinoderm species inhabiting the soft-bottom sediments of shallow-brackish waters adjacent to the largest river basin a...
Chapter
Full-text available
The eastern tropical Pacific (ETP) is an isolated oceanic region exposed to extreme oceanographic conditions, including low salinity, low pH, high temperatures during El Niño, and low temperatures during La Niña and seasonal upwelling. The coral reefs in this region have a relatively limited suite of species compared to other coral reef areas of th...
Chapter
This chapter reviews and evaluates coral reef conservation strategies along the eastern tropical Pacific (ETP), a narrow biogeographic region on the Pacific American coast that extends from southern Baja California, Mexico to northern Peru, including several oceanic islands. The ETP is a natural laboratory, a model for understanding the development...
Chapter
Bioerosion, the weakening and erosion of hard substrates by boring, etching, and grazing organisms, is a major structuring force on coral reefs of the Eastern Tropical Pacific (ETP). Bioerosional processes are the main source of reef erosion, and facilitate recycling of reefal carbonate. In healthy reefs, a dynamic balance exists between destructiv...
Article
Full-text available
The Museum of Zoology, Universidad de Costa Rica (MZUCR) was founded in 1966 and houses the most complete collection of vertebrates and invertebrates in Costa Rica. The MZUCR currently has 24 collections containing more than five million specimens, and more than 13 000 species. The earliest collections date back to 1960 and include fishes, reptiles...
Article
Full-text available
Bioerosion is a natural process in coral reefs. It is fundamental to the health of these ecosystems. In the Eastern Tropical Pacific (ETP) coral reefs, the most important bioeroders are sponges, bivalves, sea urchins and the fish Arothron meleagris. In the 1980s, El Niño caused high coral mortality and an increase in macroalgal growth. As a result,...
Technical Report
Full-text available
Los arrecifes coralinos son los ecosistemas marinos que presentan la mayor biodiversidad del planeta, ya que alberga cerca del 25% de las especies marinas que se conocen (César & Chong 2004). Sus principales constructores son los corales, los cuales contribuyen con la acumulación de carbonato de calcio y dan estructura al ecosistema (Bellwood et al...
Article
Full-text available
Isla del Coco, Costa Rica, is one of the five groups of oceanic islands of the Eastern Tropical Pacific (ETP), and is considered one of the most diverse. Since the mid-19th century, it has been the target of a number of scientific research expeditions that have produced specimen collections which are housed in natural history museums around the wor...
Article
Full-text available
The study of complete mitochondrial genomes (mitogenomes) revealed different gene rearrangements, highly variable markers, and delineated clades that have aided the understanding of the evolutionary history in corals. In this study, we examined mitogenomic variation of reef-building Porites corals and designed 34 primer pairs to target high diversi...
Article
Full-text available
Coral reefs of Isla del Coco National Park, Costa Rica: structure and comparison (1987-2014). Isla del Coco has one of the most diverse and well conserved coral reefs in Costa Rica. These reefs have been extensively studied since the 1980’s, however those studies focused mainly on coral coverage. The aim of this study is to evaluate the coral reefs...
Article
Full-text available
p>Coloration patterns of reef fishes are an important trait for mediating intra and interspecific interactions, as well as for taxonomic identifications. Here we report a specimen of Stegastes arcifrons that presented a previously unobserved and anomalous color variation on a coral reef at Isla del Coco, Pacific Costa Rica. This color variation is...
Article
Full-text available
Diademais among the most abundant, widely dispersed, and ecologically important genera of sea urchin in tropical shallow waters. D. mexicanumis distributed from the Gulf of California to northern Peru, including the oceanic islands of Revillagigedo, Clipperton, Coco, Malpelo, and Galápagos, and it is one of the most important sea urchin species in...
Article
Full-text available
Diadema mexicanum, erizo de mar clave en los arrecifes coralinos del Pacífico Tropical Oriental: lo que sabemos y perspectivas futuras (Diadematoida: Diadematidae) Abstract: Diadema mexicanum, a key species of sea urchin in coral reefs of the Eastern Tropical Pacific: state of knowledge and future perspectives. Diadematids are among the most ecolog...
Article
Full-text available
Diadematids are among the most ecologically important sea urchin families. This review presents the state of knowledge of an important member of that family, Diadema mexicanum, in the Tropical Eastern Pacific based on studies carried out mainly in Panama, Costa Rica and Mexico. Density of D. mexicanum is low, fluctuating between 0.008 and 9.5 ind m...
Article
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Osa Conservation Area (Costa Rica) coral ecosystems: structure and conservation needs. Costa Rica is considered one of the 20 most biodiverse countries in the world, which includes it´s well known reefs ecosystems. Specifically, the South Pacific region, the Osa Conservation Area (ACOSA), holds one of the richest reefs of the country. Even though m...
Article
Full-text available
Costa Rica is considered one of the 20 most biodiverse countries in the world, which includes its well known reefs ecosystems. Specifically, the South Pacific region, the Osa Conservation Area (ACOSA), holds one of the richest reefs of the country. Even though many of these reefs have been studied since the 1980s, most of them had focused mainly on...
Article
Full-text available
A new species of sea cucumber of the genus Lissothuria Verrill, 1867 is described. Lissothuria caboblanquensis n. sp. was found in the Costa Rican Pacific, at 17 m depth. The presence of towers with spiny apex and the elaborated shape of the hourglasses in the dorsal body wall, make this species unique among the species of this genus. This species...
Chapter
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We investigated the current patterns of diversity by country and by class of echinoderms, and analyzed their biogeographical, depth, and habitat or substratum affinities, using the database of the appendix of this book. Traditionally, the area has been divided into five biogeographical Regions and nine Provinces that cover a wide climate range. Cur...
Chapter
Central America is a region with a high biological diversity, not only in its terrestrial part, but also in its marine component. This is the result of a rich geological history that has caused the exchange and isolation of fauna and flora. The richness of ecosystems and coastal morphologies allow the presence of various groups of organisms, and am...
Chapter
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Panama has a diverse echinoderm fauna with 414 species recorded. This is comprised of 21 species of crinoids, 130 species of ophiuroids, 83 species of asteroids, 78 species of echinoids and 102 species of holothuroids. With the exception of crinoids, diversity of echinoderms in Panama is greater in the Pacific (270 species) than in the Caribbean (1...
Chapter
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Latin America (LA) includes all countries in the Americas that speak Spanish or Portuguese; in total it includes 22 countries including Mexico, Central America, the islands of the Caribbean and South America and Haiti (Hispaniola Island, shared with Dominican Republic). This book is divided in 16 chapters and two taxonomic lists with information ab...
Article
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Desde el 2001 se ha observado una propagación del alga verde Caulerpa sertularioides en Bahía Culebra, zona de afloramiento costero, en el Pacífico norte de