9 May
2021

Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus

first_imgThis study reports the first multi-year observations on the reproductive patterns for an Antarctic predator/scavenger, Odontaster validus (Koehler 1912). Seastars were collected monthly from a shallow site (15–20 m depth) near the British Antarctic Survey (BAS) Rothera Research Station (Adelaide Island, 67°34′S 68°08′W) from July 1997 to January 2001. Reproductive condition, oocyte size frequencies and spermatogenesis were examined in at least ten seastars each month using histological and image analysis techniques. Gonad indices (GI) and pyloric caeca indices (PI) were also examined in the same samples. Female and male GIs varied seasonally, in parallel with a reduction in the proportion of large oocytes and mature sperm in the gonad in August to mid-October following winter spawning. Despite there being remarkable consistency in the timing of spawning from year to year, differences in the reproductive condition of individuals were apparent. Patterns in the digestive tissues also varied with season, peaking in December and reaching a minimum in February in two of the three study years. This weaker annual pattern may partly reflect the varied diet of this predator/scavenger species, which is not directly dependant on the timing and magnitude of the annual phytoplankton bloom. Pooled oocyte size distributions and residual analysis suggested that oogenesis progressed over 18–24 months, with the largest of the two size classes (maximum diameter = 183 μm) being spawned annually. This pattern of oocyte growth and spawning was previously reported in the early 1960s for an O. validus population from McMurdo Sound, which lies south of Rothera by 10° latitude. The extremely catholic diet of this predator/scavenger suggests the reproductive patterns of the seastar will be less susceptible to changes in food supply compared to polar suspension feeders or deposit feeders.last_img read more

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26 Aug
2020

No Stephen Curry, James Harden in LeBron James’ ‘Space Jam 2’? That’s shoe biz, report says

first_imgThe report comes after Bucks star Giannis Antetokounmpo turned down a role because he didn’t want to “give up two weeks of private workouts to train with his fellow stars.””I don’t like being Hollywood,” Antetokounmpo said (per ESPN). “I don’t like all this extra drama. I am just going to try to be me.”Despite the casting issue, “Space Jam 2” will continue on schedule and start filming in July after the NBA Finals. IMDB lists the movie with a 2021 release date. Several players already have turned down an opportunity to star in LeBron James’ “Space Jam” sequel, claiming they don’t want the movie to be a distraction to their training. However, a new report reveals there could be more to it than that. Warriors star Stephen Curry and Rockets star James Harden likely won’t join James for the film because of concerns of a shoe rivalry, according to the Hollywood Reporter, which cited unidentified sources. The Hollywood Reporter notes another factor keeping NBA stars away from joining the cast: James’ family life will be more of a focus for the movie, rather than a group of NBA players. The first “Space Jam” movie starred Michael Jordan and featured Larry Bird, Charles Barkley, Patrick Ewing, Larry Johnson, Muggsy Bogues and Shawn Bradley. Giannis Antetokounmpo turned down role in ‘Space Jam 2’ The sneakers play a factor because the original 1996 film was inspired and based on the “Hare Jordan” Nike commercial. Nike became an essential part of “Space Jam,” which creates a problem for Curry and Harden because of their current shoe contracts. Curry has a deal with Under Armour through 2024, while Harden is under contract with Adidas until 2028.The report also indicated that Golden State’s Kevin Durant, who is a Nike endorser, won’t be in the movie because of his own Hollywood venture that will be based on his life. He’s working on launching an Apple series, called “Swagger.” Related Newslast_img read more

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