Tag: "spawning" at biology news
Gene therapy may offer release from sterile isolation for patients lacking immune systems
...d stem cells migrated to the bone marrow and began spawning
key types of immune cells, such as B cells, T cells, and NK cells. Within months, antibodies appeared, and the patients responded normally to small amounts of certain pathogens, such as the tetanus vaccine. One year later, one of the patients no long...
Scientists identify 'genetic signature' of stem cells
...balance between replenishing their own numbers and spawning
mature cells dedicated to specific tasks. The cues that determine whether a stem cell replaces itself or produces a more specialized offspring come from both within and from outside of the cell, said Lemischka. "That is why we think these papers are ...
Scripps Institution researchers develop new approach for designing marine reserves
...d with fundamental information about biodiversity, spawning
activities of key species, nurseries for reef fishes, ecological connectivity between habitats, and other important ecological processes. The researchers entered the information into a computer software program equipped with "optimization algorit...
Reconstructing salmon populations
...nd found to relate to the massive deaths following spawning
salmon. According to Naiman, "Measuring nitrogen isotopes in tree rings is potentially more accurate, although much harder to determine."...
Science picks-leads, feeds and story seeds (January 2003)
... high fluctuating flows to disrupt non-native fish spawning
and use electro-fishing techniques to remove non-native fish. The high-fluctuating flows began Jan. 1, 2003, and will continue through March of this year and then repeat again January-March 2004. For more information on the 1996 experimental flood,...
Synchronised swimming helps catch prey
...onized flashing of fireflies, the spectacular mass spawning
events in some coral reefs, are but a few well known examples. From a physicist's perspective, the principles that lead to synchronization are well understood for periodic systems. But in recent years the theory has taken on a whole new dimension w...
Scientists crack the black box of coastal ecosystems
...he pathways of individual larvae as they move from spawning
sites to adult settling sites. "Microchemistry is allowing us to track larvae for the first time and that can help us determine what areas are necessary and dependable sources of young for other areas," says Warner. Given the current global dialogues...
Exploring the sights and sounds of a deepwater coral marine protected area off Florida
...c fish species and behaviors such as courtship and spawning
aggregation. If so, the system could dramatically increase monitoring capabilities at the remote reefs. The South Atlantic Fishery Management Council (SAFMC), the governing body that establishes fishing regulations, is currently considering establish...
Solid management, natural resilience both key to sockeye success
...than-average, body depths. Egg size, preferred spawning
sites, the size of young when hatched are among the many other adaptations that could give advantages depending on conditions. "We buy insurance for the future by having networks of habitat and not just trying to save the habitat of today's stron...
Sneak copulations and the demise of the integrity of wild salmon populations
...ons, darting in next to the female's ovipositor at spawning
and fertilizing large numbers of eggs. In fact, s...ful at sneaking copulations, participating in more spawning
events and having higher fertilization success than wild males. The rapid maturity, combined with hi...
Nation on the verge of 'new era in modern river management'
... dam in 1997 that had blocked hundreds of miles of spawning
grounds for American shad and other species. On both the Neuse and the Kennebec, fish are now returning in numbers that have not been seen in decades. Lowry's river restoration case studies, such as the failed attempt to restore salmon runs on the S...
New marine protected area to safeguard world's largest fish
...h found in tropical seas throughout the world, its spawning
congregations are notoriously unpredictable. The only place in the world they predictably gather each spring is in the region near Little Water Caye. "Now that we own and will manage the majority of Little Water Caye, we can ensure that these magnifi...
New imaging vehicle maps coral reefs to determine health of reef and fisheries
...ne the health of deepwater coral reefs and related spawning
areas for commercial fisheries. While recent reports indicate shallow reefs in the Caribbean and around the world are threatened, this new study found well-developed deeper water coral reefs with nearly 100 percent living coral cover, highly unusual...
New book says Northwest salmon could face same fate as those in Northeast, England
New laws protected salmon spawning
grounds in 17 rivers, prohibiting the streams from...l of salmon enough adult salmon had to reach their spawning
grounds, and enough juvenile salmon had to reach the sea." But he outlines how time and again, in E...
Pushing marine fish aquaculture forward
...lture facilities. Manipulating temperature during spawning
to produce all female offspring for fish such as s...ar round, rather than being constrained by natural spawning
patterns. The conference, called the International Sustainable Marine Fish Culture Conference and W...
Congress allocates funding for horseshoe crab research center
... to identify historic, current and probable future spawning
habitat through geographic information systems; a ...using aerial photography to expand the coverage of spawning
surveys (how often and where the crabs are laying their eggs); and a study to investigate the dynami...
National ocean commissioners & scientists call for overhaul of ocean policies & management
...elshaus. "When the ecosystem can no longer support spawning
salmon, the effect on the fish is obvious--but no ...e life histories and different timing of breeding, spawning
and rearing. Over the past two decades, as environmental conditions have changed in utterly unpredic...
Asia's bear-sized catfish are disappearing
...year between downstream feeding areas and upstream spawning
areas. "The giant catfish and other fish in this diverse ecosystem are extremely important to the health and economic well-being of local peoples but are threatened by the construction of hydropower dams and other problems," Moyle said. "We hope that...
Gulf marine reserves given new life
... June 2000 to study their potential for protecting spawning
populations of grouper and other bottom-dwelling f...eir participation, we might still be searching for spawning
sites in the Gulf of Mexico," said Florida State University marine biologist Felicia Coleman. Throu...
Earstones tell fishes' tale of early life in the Colorado River estuary
... nursery area and heavy fishing pressure in fish's spawning
site. Estuaries, zones where fresh river water and salty ocean water mix to form brackish water, are known to be nursery areas for many species of marine life, including many fishes. Both totoaba and gulf corvina spawn in the mouth of the Colorado, a...
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