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FIU Scientists Investigate Deep-Sea Shrimp Navigation at Hydrothermal Vents

FIU Scientists Investigate Deep-Sea Shrimp Navigation at Hydrothermal Vents

Scientists from Florida International University (FIU), including marine scientist Heather Bracken-Grissom, recently completed a month-long expedition to the deepest hydrothermal vents in the Caribbean Sea. The research team, which also included scientists from NOVA Southeastern University, the University of Delaware, and Duke University, aimed to unravel the mystery of how shrimp navigate to these extreme environments. These deep-sea vents, nearly three miles beneath the surface, are characterized by crushing pressure and superheated, chemical-rich water, yet millions of shrimp congregate there. The expedition utilized the human-occupied submersible Alvin for dives, collecting specimens, environmental data, and high-resolution images. A key focus of their investigation is the shrimp's visual sensitivity, genetics, and eye structure, particularly a large light-sensitive organ on some vent shrimp's backs known as a dorsal eye. The team is exploring whether the shrimp detect faint radiation from the hot vent...
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Why Can Clownfish Change From Male to Female?

Why Can Clownfish Change From Male to Female?

The life cycle of a clownfish is a fascinating journey marked by intricate reproductive behaviors, a pelagic larval stage, and a remarkable ability...
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Shedd Aquarium Research Reveals Bluegills in Chicago River Are 'Marathoners,' Challenging 'Homebody' Perception

Shedd Aquarium Research Reveals Bluegills in Chicago River Are 'Marathoners,' Challenging 'Homebody' Perception

Austin Happel, a researcher at Shedd Aquarium, has been tracking fish movement in the Chicago River using telemetry tags to understand their habitat use and behavior. His research has overturned previous assumptions, particularly regarding bluegills. While some bluegills exhibited typical 'homebody' behavior, others displayed an unexpected range. One-third of the 15 tagged bluegills covered five miles or more in a single day, with one individual, dubbed the 'marathoner,' swimming nearly 7.5 miles daily on multiple occasions. This level of endurance, scaled to human size, is equivalent to swimming 52 miles, a distance comparable to Navy Pier to Racine, Wisconsin. Happel calculated that this bluegill moved at 4,000 body lengths per hour, surpassing the 3,000 body lengths per hour of an elite human marathon swimmer. This finding highlights the remarkable athletic capabilities of fish in the Chicago River, a waterway that is home to approximately 80 species.
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The Amazing Partnership That Helps Clownfish Survive

The Amazing Partnership That Helps Clownfish Survive

Clownfish, also known as anemonefishes, are iconic residents of the warm, tropical waters of the Indo-Pacific. These saltwater fish, belonging to t...
ReutersReuters
Screwworm infests US horse before port reopens to Mexican livestock

Screwworm infests US horse before port reopens to Mexican livestock

By Tom Polansek CHICAGO, Sept 17 (Reuters) - The U.S. confirmed a case of New World screwworm in a horse in New Mexico on Thursday, as the federal government prepared to resume imports of Mexican livestock into the state after blocking trade in an attempt to keep out the flesh-eating parasite.
Savannah Morning NewsSavannah Morning News
Hummingbird migration underway for fall 2026. What to expect in Georgia

Hummingbird migration underway for fall 2026. What to expect in Georgia

Hummingbirds are already flying south to stay warm. When is the start of fall? When will they be in Georgia? Where are they going?
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Barbary Macaque Tooth Discovery in Germany Reveals Ancient European Range

Barbary Macaque Tooth Discovery in Germany Reveals Ancient European Range

A research team from the Senckenberg Centre for Human Evolution and Palaeoenvironment at the University of Tübingen and Leiden University has discovered a 300,000-year-old Barbary macaque tooth in Schöningen, Lower Saxony, Germany. This finding represents the northernmost evidence of this primate species in continental Europe. Barbary macaques (Macaca sylvanus) are currently the only extant macaque species native to North Africa, with a small population also in Gibraltar. All other macaque species reside in Asia. The discovered tooth is a deciduous molar from an approximately one-year-old macaque, closely related to the modern Barbary macaque. The Schöningen site, renowned for its well-preserved Paleolithic remains, indicates that the landscape 310,000 years ago was an open woodland with birch and pine, with average summer and winter temperatures similar to today, though winters were at least one degree Celsius colder, suggesting a more continental climate. This discovery significantly expands the known hi...
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Newfoundland Discovery Reveals Ediacaran Stem-Group Ctenophore, Expanding Metazoan Evolution Record

Newfoundland Discovery Reveals Ediacaran Stem-Group Ctenophore, Expanding Metazoan Evolution Record

A recent discovery in the Fermeuse Formation of Newfoundland has unearthed Edrathina obditchia, an Ediacaran stem-group ctenophore. This fossil material, preserved as a positive moldic epirelief beneath a volcanic ash layer, was found at the approximately 551-million-year-old Inner Meadow Lagerstätte near Upper Island Cove. Researchers suggest affinities with the roughly 10-million-year-younger Cambrian stem-ctenophores of the epibenthic Dinomischidae due to comparable morphologies, supported by phylogenetic analyses. Edrathina obditchia distinguishes itself from Cambrian dinomischids by possessing a broader basal disc, interpreted as an adaptation for anchoring on Ediacaran microbial matgrounds, and having offset rather than opposite pinnules. This finding extends the known stem-ctenophore record into the Ediacaran period, providing crucial evidence for a more protracted period of metazoan evolution preceding the Cambrian radiation.
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Antarctic Krill Discovered in Deep-Sea Hydrothermal Vents, Raising Questions About Ecosystem Resilience

Antarctic Krill Discovered in Deep-Sea Hydrothermal Vents, Raising Questions About Ecosystem Resilience

Antarctic krill, a foundational species in the Southern Ocean food web, have been discovered inhabiting deep-sea hydrothermal vents. This surprising finding was made during the National Geographic and Rolex Perpetual Planet Southern Ocean Expedition, where researchers observed and collected egg-laden female krill at a vent off the Antarctic Peninsula. Kim Bernard, a biological oceanographer at Oregon State University, noted that krill had never before been spotted in such an extreme environment. Traditionally, krill are known to swarm in the upper layers of the ocean. The discovery suggests a previously unknown adaptive behavior, as these vents are characterized by extremely hot water, heavy metals, and a lack of sunlight, a stark contrast to their usual habitat.
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Antarctic Chinstrap Penguin Nests Decline by 59% Over 45 Years, Drone Survey Reveals

Antarctic Chinstrap Penguin Nests Decline by 59% Over 45 Years, Drone Survey Reveals

A recent drone survey conducted in January over a square mile of Antarctic rock has revealed a significant decline in chinstrap penguin nests. The survey counted 19,886 occupied nests, a stark contrast to the 49,410 nests recorded in a ground survey 45 years prior, in 1980. This represents an approximate 59% reduction in breeding pairs at the site. The drone imagery, which stitched together 1,802 photographs, also showed that the colony has fragmented into 108 separate subcolonies, whereas historically it comprised about ten breeding groups. This fragmentation means that the birds are spread across the original footprint in thinning fragments, rather than consolidating into smaller, denser blocks. The study highlights that while the overall area remains unchanged, the density of the penguin population is collapsing. The use of drones allowed for a more accurate and less disruptive counting method compared to traditional on-foot surveys, providing a fixed record that can be recounted and verified.
The Corpus Christi Caller TimesThe Corpus Christi Caller Times
A displaced sea urchin gets a ride back to the Gulf

A displaced sea urchin gets a ride back to the Gulf

Jace Tunnell describes finding a live Atlantic purple sea urchin that had washed ashore on a piece of debris.
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Cambrian Explosion Reveals Rapid Diversification of Early Animal Life

Cambrian Explosion Reveals Rapid Diversification of Early Animal Life

The Cambrian period, beginning approximately 540 million years ago, is marked by a phenomenon known as the Cambrian explosion, which saw the geologically sudden appearance and rapid diversification of many major animal lineages in the fossil record. This period is characterized by a swift expansion of skeletonized forms and increased ecological complexity, including the emergence of arthropods, molluscs, and early chordates, complete with eyes, limbs, guts, and armor. Key fossil discoveries, particularly from the Burgess Shale in British Columbia, provide exquisite detail of soft-bodied organisms from around 508 million years ago. Notable examples include Anomalocaris, a large predator, and trilobites, which are iconic arthropods that diversified into thousands of species and are used as index fossils for correlating Paleozoic strata.