Riley A. Pollom

Riley A. Pollom
Seattle Aquarium · Conservation Programs and Partnerships

MSc.

About

117
Publications
28,704
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
978
Citations
Education
January 2011 - July 2015
September 2003 - April 2008
The University of Calgary
Field of study
  • Ecology, Geography

Publications

Publications (117)
Article
Full-text available
The extinction risk of sharks, rays and chimaeras is higher than that for most other vertebrates due to low intrinsic population growth rates of many species and the fishing intensity they face. The Arabian Sea and adjacent waters border some of the most important chondrichthyan fishing and trading nations globally, yet there has been no previous a...
Article
Full-text available
Understanding the details of local and regional extinctions allows for more efficient allocation of conservation activities and resources. This involves identifying where populations persist, where populations may still be present, and where populations may be locally extinct. Three threatened angel sharks occur in the Eastern Atlantic and Mediterr...
Article
Full-text available
Overfishing is the primary cause of marine defaunation, yet declines in and increasing extinction risks of individual species are difficult to measure, particularly for the largest predators found in the high seas. Here we calculate two well-established indicators to track progress towards Aichi Biodiversity Targets and Sustainable Development Goal...
Article
Full-text available
Few marine taxa have been comprehensively assessed for their conservation status, despite heavy pressures from fishing, habitat degradation and climate change. Here we report on the first global assessment of extinction risk for 300 species of syngnathiform fishes known as of 2017, using the IUCN Red List criteria. This order of bony teleosts is do...
Article
Full-text available
The scale and drivers of marine biodiversity loss are being revealed by the International Union for Conservation of Nature (IUCN) Red List assessment process. We present the first global reassessment of 1,199 species in Class Chondrichthyes—sharks, rays, and chimeras. The first global assessment (in 2014) concluded that one-quarter (24%) of species...
Article
Chondrichthyan fishes are among the most threatened vertebrates on the planet because many species have slow life histories that are outpaced by intense fishing. The Western Central Atlantic Ocean, which includes the Greater Caribbean, is a hotspot of chondrichthyan biodiversity and abundance, but has been characterized by extensive shark and ray f...
Preprint
Full-text available
The southwest Indian Ocean (SWIO) is a hotspot of endemic and evolutionarily distinct sharks and rays. We summarise the extinction risk of the sharks and rays endemic to coastal, shelf, and slope waters of the SWIO and adjacent waters (Namibia to Kenya, including SWIO islands). Thirteen of 70 species (19%) are threatened: one is Critically Endanger...
Preprint
Chondrichthyan fishes are among the most threatened vertebrates on the planet because many species have slow life histories that are outpaced by intense fishing. The Western Central Atlantic Ocean, which includes the greater Caribbean, is a hotspot of chondrichthyan biodiversity and abundance, but is historically characterized by extensive shark an...
Article
Full-text available
The scale and drivers of marine biodiversity loss are being revealed by the International Union for Conservation of Nature (IUCN) Red List assessment process. We present the first global reassessment of 1,199 species in Class Chondrichthyes—sharks, rays, and chimeras. The first global assessment (in 2014) concluded that one-quarter (24%) of species...
Preprint
Full-text available
The southwest Indian Ocean (SWIO) is a hotspot of endemic and evolutionarily distinct sharks and rays. We summarise the extinction risk of the sharks and rays endemic to coastal, shelf, and slope waters of the SWIO and adjacent waters (Namibia to Kenya, including SWIO islands). Thirteen of 70 species (19%) are threatened: one is Critically Endanger...
Technical Report
Full-text available
Rhizoprionodon lalandii. The IUCN Red List of Threatened Species 2020
Technical Report
Full-text available
Red list assessment of Dasyatis chrysonata
Technical Report
Full-text available
The Multispine Skate (Bathyraja multispinis) is a medium-sized (to 126 cm total length) skate that occurs in the Southeast Pacific Ocean from Coquimbo, Chile to Cape Horn and in the Southwest Atlantic Ocean from Santa Catarina, Brazil to Tierra del Fuego and the Falkland Islands (Malvinas) and is demersal on the continental and insular shelves and...
Technical Report
Full-text available
The Broadnose Skate (Bathyraja brachyurops) is a medium-sized (to 125 cm total length) skate that occurs in the Southeast Pacific and Southwest Atlantic Oceans from Biobío, Chile, south around Cape Horn and north to Rio Grande do Sul, Brazil, including the Falkland Islands (Malvinas). It is demersal on the inner continental shelf and upper slope at...
Technical Report
Full-text available
The Whitedotted Skate (Bathryraja albomaculata) is a large (to 150 cm total length) skate that occurs in the Southeast Pacific and Southwest Atlantic Oceans from Coquimbo, Chile south around Cape Horn and north to Uruguay, including the Falkland Islands (Malvinas) and the Burdwood Bank, and is demersal on the inshore continental shelf and upper slo...
Technical Report
Full-text available
The Greytail Skate (Bathyraja griseocauda) is a large (to 157 cm total length) skate that occurs in the Southeast Pacific and Southwest Atlantic Oceans from Coquimbo, Chile south around Cape Horn and north to Uruguay, including the Falkland Islands (Malvinas), and is demersal on the mid-continental shelf and upper slope at depths of 30–1,010 m. It...
Technical Report
Full-text available
The Patagonian Skate (Bathyraja macloviana) is a small (to 71 cm total length) skate that occurs in the Southeast Pacific Ocean off Magallanes, Chile and in the Southwest Atlantic Ocean from Uruguay to Tierra del Fuego, Argentina and the Falkland Islands (Malvinas) and is demersal on the inner continental shelf and upper slope at depths of 50–515 m...
Technical Report
Full-text available
The Southern Thorny Skate (Amblyraja doellojuradoi) is a small (to 69 cm total length) deepwater skate that occurs in the Southeast Atlantic Ocean from Uruguay to Southern Argentina and the Burdwood Bank, including the Falkland Islands (Malvinas). It is demersal on the mid- and outer continental shelf and upper slope at depths of 50–1,000 m. This s...
Technical Report
Full-text available
The Darkbelly Skate (Bathyraja meridionalis) is a large (to 158 cm total length) that occurs in the Southeast Pacific Ocean off Magallanes Province, Chile, in the Southwest Atlantic Ocean from Buenos Aires to Tierra del Fuego, Argentina and westward to the Falkland Islands (Malvinas), and in the Antarctic Atlantic Ocean around the Shag Rocks and So...
Technical Report
Full-text available
The Magellan Skate (Bathyraja magellanica) is a medium-sized (to 105 cm total length) skate that occurs in the Southeast Pacific Ocean from Puerto Montt, Chile to Cape Horn and in the Southwest Atlantic Ocean from San Matías Gulf to Tierra del Fuego, Argentina, off the Falkland Islands (Malvinas), and on the Burdwood Bank. It is demersal on the con...
Article
Full-text available
Sharks are a taxon of significant conservation concern and associated public interest. The scientific community largely supports management policies focusing on sustainable fisheries exploitation of sharks, but many concerned members of the public and some environmental advocates believe that sustainable shark fisheries cannot and do not exist and...
Technical Report
Full-text available
The Thintail Skate (Dipturus leptocaudus) is a medium-sized (to 88 cm total length) skate that occurs in the Southwest Atlantic from Santa Catarina, Brazil to Uruguay (and possibly Argentina). It inhabits the continental shelf and upper slope at depths of 10–550 m. It is captured in commercial deep-water trawl, longline, and gillnet fisheries, whic...
Technical Report
Full-text available
The Lesser Numbfish (Narcine brasiliensis) is a small (to 45 cm total length) ray that occurs in the Southwest Atlantic from southern Brazil to Buenos Aires Province, Argentina. It is benthic on soft substrates of the continental shelf at depths of 6–60 m. It is captured in intense and largely unmanaged commercial and artisanal trawl and beach sein...
Technical Report
Full-text available
The Wingfin Stingray (Fontitrygon geijskesi) is a medium-sized (to 150 cm disc width) ray that occurs in the Western Central and Southwest Atlantic from eastern Venezuela and Trinidad and Tobago to western Ceará, Brazil. It is demersal on the continental shelf inhabiting shallow coastal waters and estuaries, from inshore to 80 m depth. This stingra...
Technical Report
Full-text available
The Southern Eagle Ray (Myliobatis goodei) is a medium-sized (to at least 115 cm DW) coastal eagle ray that occurs in the Western Central and Southwest Atlantic Oceans from South Carolina and Florida, USA and Quintana Roo, Mexico to San Jorge Gulf, Santa Cruz, Argentina. It inhabits continental shelves from inshore to depths of 181 m. It is capture...
Technical Report
Full-text available
The Western Humpback Dogfish (Squalus quasimodo) is a small (to at least 85 cm total length) shark that occurs in the Southwest Atlantic off Rio Grande do Sul, Brazil, and possibly also in the Western Central Atlantic off Margarita Island, Venezuela. This shark is captured in commercial and artisanal gillnets, longlines, and trawls. Its recent taxo...
Technical Report
Full-text available
The Northeastern Brazilian Dogfish (Squalus bahiensis) is a small (to at least 69 cm total length) shark that occurs in the Southwest Atlantic and is known only from the type locality off Belmonte, Bahia, Brazil at a depth of 599 m. Its recent taxonomic resolution precludes inferences of catch rates or trends, but Squalus spp. are targeted and caug...
Technical Report
Full-text available
The Shortnose Eagle Ray (Myliobatis ridens) is a medium-sized (to 70 cm disc width) ray that occurs in the Southwest Atlantic from Santa Catarina, Brazil, to Buenos Aires Province, Argentina. It inhabits inshore bays and estuaries at depths of 5–47 m. It is captured in intense and largely unmanaged artisanal gillnet and beach seine fisheries throug...
Technical Report
Full-text available
The Bullnose Eagle Ray (Myliobatis freminvillii) is a medium-sized (to 106 cm disc width) demersal coastal eagle ray that occurs in the Northwest, Western Central, and Southwest Atlantic Oceans from Massachussetts, USA to the Texas coast of the Gulf of Mexico and from Venezuela to Buenos Aires, Argentina and inhabits continental shelves from the su...
Technical Report
Full-text available
The Brazilian Filetail Catshark (Parmaturus angelae) is a small (to at least 42.5 cm total length) deep- water shark that occurs in the Southwest Atlantic off Rio de Janeiro and Santa Catarina states, Brazil. It is demersal on the continental slope at depths of 500–600 m. It is likely captured in deep-water demersal trawl fisheries, which developed...
Technical Report
Full-text available
The Freckled Catshark (Scyliorhinus haeckelii) is a small (to 57 cm total length) shark that occurs in the Southwest Atlantic from Bahia, Brazil to northern Argentina. It inhabits the continental shelf and upper slope at depths of 37–402 m, and is often associated with deep-water reefs. This catshark is captured in artisanal and commercial trawl, g...
Technical Report
Full-text available
The Smalltail Shark (Carcharhinus porosus) is a small (<150 cm total length) coastal requiem shark that historically occurred in the Western Central and Southwest Atlantic Oceans from the central, western and southern Gulf of Mexico and along the Caribbean coast of Central and South America to the state of Paraná in southern Brazil, not including t...
Technical Report
Full-text available
Castello's Apron Numbfish (Discopyge castelloi) is a small (to at least 31 cm total length) ray that occurs in the Southwest Atlantic from Necochea, Buenos Aires, to Camarones, Chubut, Argentina. It inhabits the inner continental shelf at depths of 35–56 m. Its depth range suggests that it is exposed to commercial and artisanal demersal trawl fishe...
Technical Report
Full-text available
The Colares Stingray (Fontitrygon colarensis) is a large (to at least 165 cm disc width) ray that occurs in the Southwest Atlantic from Cayenne state, French Guiana to Maranhão, Brazil. It inhabits estuaries and shallow coastal areas around the Amazon River outflow at depths of 5–40 m. The meat is highly valued and this species has been targeted si...
Technical Report
Full-text available
IUCN Red List Assessment for Smoothback Angelshark (Squatina oculata)
Technical Report
Full-text available
IUCN Red List Assessment for Angelshark (Squatina squatina)
Article
Full-text available
The International Union for Conservation of Nature's (IUCN) Red List is the global standard for quantifying extinction risk but assessing population reduction (criterion A) of wide-ranging, long-lived marine taxa remains difficult and controversial. We show how Bayesian state-space models (BSSM), coupled with expert knowledge at IUCN Red List works...
Article
Full-text available
Hippocampus patagonicus is a coastal species of seahorse that inhabits waters from northeastern Brazil to Chubut, Argentina. The major habitats occupied by the species include seagrasses, macroalgae, and sheltered areas with sessile invertabrates. The species is threatened by habitat degradation and loss from coastal development and destructive fis...
Book
Full-text available
This report provides an overview of the con- servation status of chondrichthyans (sharks, rays, and chimaeras) in the Arabian Seas Region (ASR) and describes the results of a regional Red List workshop held in Abu Dhabi, United Arab Emirates, in February 2017. It identies those species that are threatened with extinction at the regional level, so t...
Article
Full-text available
Europe has a long tradition of exploiting marine fishes and is promoting marine economic activity through its Blue Growth strategy. This increase in anthropogenic pressure, along with climate change, threatens the biodiversity of fishes and food security. Here, we examine the conservation status of 1,020 species of European marine fishes and identi...
Technical Report
Full-text available
Species in the family Syngnathidae were assessed for the IUCN Red List of Threatened Species at the Mediterranean regional level. Of the 13 species native to the Mediterranean Sea, two are Near Threatened, four are Least Concern, and seven are considered Data Deficient because there is not enough information about the species to assess their e...
Article
Full-text available
Nomenclatural clarity is vital for the collection, dissemination, and retrieval of natural history information, which itself is necessary for effective conservation and management of species. Seahorses (genus Hippocampus) are small marine fishes that in many cases are heavily exploited and suffering severe population declines worldwide, leading to...
Article
This review assessed the status and scope of freshwater hydroacoustic fisheries research in global aquatic ecosystems with emphasis on i) geographical and spatial scope, ii) taxonomic range at the species and family levels (restricted to bony fishes of the Actinopterygii and Sarcopterygii), and iii) temporal scope. Hydroacoustic measures have been...