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"Crabs."
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Moonlight crab count
\"Even kids can get involved in science! Ecologist Dr. Neeti Bathala and Jennifer Keats Curtis collaborate to bring us the story of these adventurous citizen scientists. Leena and her mom volunteer each summer to count the horseshoe crabs that visit their beach. With their dog Bobie at their sides, the duo spends a night on the shore surveying horseshoe crabs who have come to mate and lay eggs. Readers will learn valuable facts about these ancient animals and how they can get involved in the effort to conserve horseshoe crabs\"-- Provided by publisher.
Book
Population homogeneity with unequal exploitation and recruitment contribution within the 2700 km geographic distribution of the commercial hairy crab Romaleon setosum
Knowledge of the genetic structure of commercially exploited marine species populations is crucial to gaining insights into stock dynamics and population connectivity. This information is essential for effective fisheries management. Economically important benthic fishery species include brachyuran crabs, with the hairy crab Romaleon setosum being an important resource in Chile and Peru. The exploitation is uneven along the Chilean coast, with two areas accounting for 67% of the total biomass caught per year. The genetic structure of the R. setosum population along the Chilean coast was analysed based on the variability of thousands of single-nucleotide polymorphisms (SNPs) in individuals from 10 areas covering 2700 km of coastline. After data filtering, 256 individuals and 2,383 SNPs remained. There was no evidence of genetic population structure within the studied area, suggesting that there is only one genetic population of R. setosum along the coast of Chile. Therefore, among Cancridae species, R. setosum has the largest geographic distribution of a single population described worldwide to date. Finally, the analysis of gene flow showed that the zone with the highest fishery also provided the highest proportion of migrants to the other zones. This study emphasises the urgency of local management of source populations in conjunction with the use of size and sex for fisheries control of R. setosum along the Chilean coast.
Journal Article
Japanese spider crabs
\"A photo-illustrated book for elementary readers about the giant Japanese spider crabs. Readers learn about their ocean habitat, feeding habits, super long legs, and modes of survival. Includes fun facts, table of contents, glossary, further resources, and index\"-- Provided by publisher.
Book
Lower Ordovician synziphosurine reveals early euchelicerate diversity and evolution
Euchelicerata is a clade of arthropods comprising horseshoe crabs, scorpions, spiders, mites and ticks, as well as the extinct eurypterids (sea scorpions) and chasmataspidids. The understanding of the ground plans and relationships between these crown-group euchelicerates has benefited from the discovery of numerous fossils. However, little is known regarding the origin and early evolution of the euchelicerate body plan because the relationships between their Cambrian sister taxa and synziphosurines, a group of Silurian to Carboniferous stem euchelicerates with chelicerae and an unfused opisthosoma, remain poorly understood owing to the scarce fossil record of appendages. Here we describe a synziphosurine from the Lower Ordovician (ca. 478 Ma) Fezouata Shale of Morocco. This species possesses five biramous appendages with stenopodous exopods bearing setae in the prosoma and a fully expressed first tergite in the opisthosoma illuminating the ancestral anatomy of the group. Phylogenetic analyses recover this fossil as a member of the stem euchelicerate family Offacolidae, which is characterized by biramous prosomal appendages. Moreover, it also shares anatomical features with the Cambrian euarthropod
Habelia optata
, filling the anatomical gap between euchelicerates and Cambrian stem taxa, while also contributing to our understanding of the evolution of euchelicerate uniramous prosomal appendages and tagmosis.
Here, the authors describe an early synziphosurine from the Lower Ordovician Fezouata Shale of Morocco, which exhibits traits that elucidate the long-contentious relationships between crown euchelicerates and their sister taxa, and also clarifies euchelicerate body plan evolution.
Journal Article
Walking Sideways
The world's nearly 7,000 species of crabs are immediately recognizable by their claws, sideways movement, stalked eyes, and thick outer shells. These common crustaceans are found internationally, thriving in various habitats from the edge of the sea to the depths of the ocean, in fresh water or on land. Despite having the same basic body type as decapod crustaceans-true crabs have heavy exoskeletons and ten limbs with front pincer claws-crabs come in an enormous variety of shapes and sizes, from the near microscopic to the giant Japanese spider crab.
InWalking Sideways, Judith S. Weis provides an engaging and informative tour of the remarkable world of crabs, highlighting their unique biology and natural history. She introduces us to recently discovered crabs such as the Yeti crab found in deep sea vents, explains what scientists are learning about blue and hermit crabs commonly found at the shore, and gives us insight into the lifecycles of the king and Dungeness crabs typically seen only on dinner plates. Among the topics Weis covers are the evolution and classification of crabs, their habitats, unique adaptations to water and land, reproduction and development, behavior, ecology, and threats, including up-to-date research.
Crabs are of special interest to biologists for their communication behaviors, sexual dimorphism, and use of chemical stimuli and touch receptors, and Weis explains the importance of new scientific discoveries. In addition to the traditional ten-legged crabs, the book also treats those that appear eight-legged, including hermit crabs, king crabs, and sand crabs. Sidebars address topics of special interest, such as the relationship of lobsters to crabs and medical uses of compounds derived from horseshoe crabs (which aren't really crabs).
While Weis emphasizes conservation and the threats that crabs face, she also addresses the use of crabs as food (detailing how crabs are caught and cooked) and their commercial value from fisheries and aquaculture. She highlights other interactions between crabs and people, including keeping hermit crabs as pets or studying marine species in the laboratory and field. Reminding us of characters such asThe Little Mermaid's Sebastian and Sherman Lagoon's Hawthorne, she also surveys the role of crabs in literature (for both children and adults), film, and television, as well in mythology and astrology. With illustrations that offer delightful visual evidence of crab diversity and their unique behaviors,Walking Sidewayswill appeal to anyone who has encountered these fascinating animals on the beach, at an aquarium, or in the kitchen.
eBook
Crabs
\"This search-and-find book invites young readers to look for new vocabulary words and pictures while giving simple facts about a crab's ocean habitat, body parts, and behaviors\"-- Provided by publisher.
Book
Brachyuran crab fisheries in Chile: challenges and opportunities for rising demand
Rising global seafood demand poses increasing challenges for sustainable fishery management. This is particularly the case in the Global South, where many small-scale fisheries are likely to expand as they gain access to larger markets. Using Chile as a case study, we assess brachyuran crab fisheries and provide a forward-looking view on the sustainability challenges of possible increases in demand by bringing together data on supply, demand, management, and, literature review. Dominated by two species (
Metacarcinus edwarsii
and
Cancer porteri
), production has centered in southern Chile and has fluctuated over the past decade, with landings declining since 2018. Between 20% and 30% of crab caught is exported, mostly to the United States and Belgium. In Belgium Chile is the third largest supplier. Few management regulations and monitoring programs exist. Limited spatio-temporal stock assessments, suggests the status of the dominant crab species may be jeopardized. Apart from ecology, the state of knowledge is limited across socio-economic, market, and fisheries management dimensions. There are initiatives to improve with an established Fisheries Improvement Project (FIP) in southern Chile. However, the lack of evidence of policy and management improvements has inactivated the FIP until the developed management plan proposal, based on an adaptive and precautionary approach (considering biological, ecological, economic, and social objectives) be approved by the government. This work reveals the importance of understanding the dynamics between supply and demand from holistic perspectives as well as the role of local efforts for resource sustainability in the context of increasing national and global crab demand.
Journal Article
