Many sharks are cold-blooded, meaning their body temperature is consistent with the water temperature. humans are warm blooded since we generally maintain a temperature that is higher than the environment. some sharks though are an exception! lamnid sharks include the white, porbeagle, mako and salmon sharks, and these are actually endotherms (carlson et al., 2004)! the lamnid sharks are able to preserve their metabolic heat through vascular counter current heat exchangers so that their body temp is higher than the water temp (carlson et al., 2004). the counter-current heat exchangers retain heat that would have been lost when blood is oxygenated at the gill lamellae (goldman, 1997). this generally causes them to have a higher metabolic rate compared to other shark species. white sharks benefit from this in that they can still hunt in cold temperatures and have a burst of speed that relies on a generation of heat. lamnid sharks also have retia, which is an arrangement of vessels that warm the eyes and brain of the shark (helfman et al., 1997). this has the potential of helping the shark see prey movement (brill et al., 2005). thresher sharks, belonging to the alopiidae family, also have retia!
photo by: @juansharks
post by: @nikitapatel_23
Had a great chat after work with one of the advisers. we spoke about financial security, wealth accumulation, tax planning and various other subjects. he also asked me how i was getting on with my studies and was keen to hear of my progress.
from day one he has been so welcoming and i have a lot of respect for him. i've barely been with this new company a month and he already is becoming a good friend. turns out we have like minded interests besides finance too.
he said one of the other advisers at work had mentioned to him i loved astronomy and it turns out most of them do as well! he even asked me had i read "the universe in your hand" which is one of my favourite astrophysics books.
as we spoke more about literature he recommended a good book to read on finance called "the richest man in babylon" so i will definitely remember to check that out.
the people you choose to spend time with and learn from will influence the person you become so choose wisely. be selfish and selective of who you're with. time is precious and life is too short to spend it with those who will weaken your vision and drain your energy.
surround yourself with sharks ig! those top of their game. all you have to do is dive in the deep end... #motivation#determination#aspiration#inspiration#mentor#teacher#idol#hero#friend#mutualinterests#kindredspirit#sharedvision#samemindset#goals#dreams#dreambig#swimwithsharks#dontbeafraid#divein#thedeepend
In the animal kingdom, communication behaviors between members of the same species happens for different reasons: to request food from parents, threaten opponents during conflict, keep predators away, warn others of danger, attract members of the opposite sex, etc. (dugatkin & reeve, 1998).
during the winter months in hawaii, male humpback whales are often seen performing these behaviors during mating season, acting aggressively towards others around the same area while competing for sexually mature females. (c. scott baker and, louis m. herman 1984). these mating strategies have been described as male dominance polygyny (clapham, 1996). the “competition” between two or more males for females usually begins with a behavior called “broadside displays” where the principal escort swims horizontally across the challenging male, blocking its path towards the female, (walther, 1984) but sometimes when it gets more aggressive they use other behaviors like head lunging, underwater blows, and sometimes they will release air from the mouth so that the bubbles may disorientate the other whale. (baker & herman, 1984).
image by @darrenjew of a heat run in tonga 🐋🐋🐋
want to learn more about sharks or adoption visit our website: oneoceandiving.com & join us in the water in #hawaii on #oahu’s #northshore to #swimwithsharks and #divewithsharksinhawaii with a @oneoceandiving trained #marinebiologist / #sharksafetydiver check out our #shark and #marineresearch@oneoceanresearch and our outreach program @oneoceaneducation#learnaboutsharks and our non-profit @waterinspired conservation group and founders: @juansharks and @oceanramsey
want to join the team? become a @oneoceanglobal ambassador looking to support in other ways? check out our not-for-profit marine conservation awareness apparel and gifts @oneoceandesigns or at oneoceandesigns.com
mahalo and thank you for supporting