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Iberian Orca Attacks
Beginning in 2020, a subpopulation of orcas (''Orcinus orca'') began ramming boats and attacking their rudders in waters off the Iberian Peninsula. The behaviour has generally been directed towards slow-moving, medium-sized sailboats in the Strait of Gibraltar and off the Portuguese, Moroccan and Galician coasts. The novel behaviour is thought to have spread between different pods, with over 500 reported interactions from 2020 to 2023 attributed to fifteen different individual orcas (the exact number is still debated between certain scientists). Background The Iberian orca subpopulation lives in the coastal waters of the Iberian Peninsula and is genetically distinct from other orca populations in the Northeast Atlantic. The orcas follow the seasonal migration of Atlantic bluefin tuna (''Thunnus thynnus''), their primary food source, gathering in the early spring in the Strait of Gibraltar. Through the summer, they remain in the Strait before travelling north along the coast of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orca
The orca (''Orcinus orca''), or killer whale, is a toothed whale and the largest member of the oceanic dolphin family. The only extant species in the genus '' Orcinus'', it is recognizable by its black-and-white-patterned body. A cosmopolitan species, it inhabits a wide range of marine environments, from Arctic to Antarctic regions to tropical seas. Orcas are apex predators with a diverse diet. Individual populations often specialize in particular types of prey, including fish, sharks, rays, and marine mammals such as seals, dolphins, and whales. They are highly social, with some populations forming stable matrilineal family groups (pods). Their sophisticated hunting techniques and vocal behaviors, often unique to specific groups and passed down from generation to generation, are considered to be manifestations of animal culture. The International Union for Conservation of Nature (IUCN) lists the orca's conservation status as data deficient as multiple orca types ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knot (unit)
The knot () is a unit of speed equal to one nautical mile per hour, exactly (approximately or ). The ISO standard symbol for the knot is kn. The same symbol is preferred by the Institute of Electrical and Electronics Engineers ( IEEE), while kt is also common, especially in aviation, where it is the form recommended by the International Civil Aviation Organization ( ICAO). The knot is a non- SI unit. The knot is used in meteorology, and in maritime and air navigation. A vessel travelling at 1 knot along a meridian travels approximately one minute of geographic latitude in one hour. Definitions ;1 international knot = :1 nautical mile per hour (by definition), : (exactly), : (approximately), : (approximately), : (approximately) : (approximately). The length of the internationally agreed nautical mile is . The US adopted the international definition in 1954, having previously used the US nautical mile (). The UK adopted the international nautical mile defi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellite Tag
Pop-up satellite archival tags (PSATs) are used to track movements of (usually large, migratory) Marine (ocean), marine animals. A PSAT (also commonly referred to as a PAT tag) is an archival tag (or data logger) that is equipped with a means to transmit the collected data via the Argos_(satellite_system), Argos satellite system. Though the data are physically stored on the tag, its major advantage is that it does not have to be physically retrieved like an archival tag for the data to be available making it a viable, fishery independent tool for animal behavior and migration studies. They have been used to track movements of ocean sunfish, marlin, blue sharks, bluefin tuna, swordfish and sea turtles to name a few species. Location, depth, temperature, oxygen levels, and body movement data are used to answer questions about migratory patterns, seasonal feeding movements, daily habits, and survival after catch and release, for examples. A satellite tag is generally constructed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acoustic Deterrent
Acoustic harassment and acoustic deterrents are technologies used to keep animalsEncyclopedia of Marine Mammals edited by William F. Perrin, Bernd Wursig, J. G.M. Thewissen page 442 and in some cases humans away from an area. Applications of the technology are used to keep s away from facilities and to keep birds away from certain areas (for instance in the vicinity of airports and blueberry fields). The devices have also been employed to keep marine mammals away fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propeller
A propeller (often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon a working fluid such as water or air. Propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air. The blades are shaped so that their rotational motion through the fluid causes a pressure difference between the two surfaces of the blade by Bernoulli's principle which exerts force on the fluid. Most marine propellers are screw propellers with helical blades rotating on a propeller shaft (ship), propeller shaft with an approximately horizontal axis. History Early developments The principle employed in using a screw propeller is derived from stern sculling. In sculling, a single blade is moved through an arc, from side to side taking care to keep presenting the blade to the wat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salmon Hat
A salmon hat is a cultural fad displayed by orcas, where they wear dead salmon upon their heads. It was first observed in 1987 with southern resident orcas and was a relatively short-lived phenomenon. In 2024, the behaviour was observed again with orcas in Puget Sound. The motivations for salmon hats are unclear, but other orcas will mimic the behaviour once it begins. One hypothesis is that orcas wear salmon hats to display high food availability, or that the same individuals that originally started the trend revitalized it. It may also indicate playfulness. See also * Iberian orca attacks References Mammal behavior Puget Sound 1987 in Washington (state) 2024 in Washington (state) Hats hat A hat is a Headgear, head covering which is worn for various reasons, including protection against weather conditions, ceremonial reasons such as university graduation, religious reasons, safety, or as a fashion accessory. Hats which incorpor ... 1980s fads and trends 2020s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Puget Sound
Puget Sound ( ; ) is a complex estuary, estuarine system of interconnected Marine habitat, marine waterways and basins located on the northwest coast of the U.S. state of Washington (state), Washington. As a part of the Salish Sea, the sound (geography), sound has one major and two minor connections to the Strait of Juan de Fuca, which in turn connects to the open Pacific Ocean. The major connection is Admiralty Inlet; the minor connections are Deception Pass and the Swinomish Channel. Puget Sound extends approximately from Deception Pass in the north to Olympia, Washington, Olympia in the south. Its average depth is and its maximum depth, off Jefferson Point between Indianola, Washington, Indianola and Kingston, Washington, Kingston, is . The depth of the main basin, between the southern tip of Whidbey Island and Tacoma, Washington, Tacoma, is approximately . In 2009, the term Salish Sea was established by the United States Board on Geographic Names as the collective wate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Resident Orcas
The southern resident orcas, also known as the southern resident killer whales (SRKW), are the smallest of four communities of the exclusively fish-eating ecotype of orca in the northeast Pacific Ocean. The southern resident orcas form a closed society with no emigration or dispersal of individuals, and no gene flow with other orca populations. The fish-eating ecotype was historically given the name 'resident,' but other ecotypes named 'transient' and 'offshore' are also resident in the same area. The U.S. National Marine Fisheries Service listed this distinct population segment of orcas as endangered, effective from 2005, under the Endangered Species Act. In Canada the SRKW are listed as endangered on Species at Risk Act Schedule 1. They are commonly referred to as "fish-eating orcas", "southern residents", or the "SRKW population". Unlike some other resident communities, the SRKW is only one clan (J) that consists of 3 pods (J, K, L) with several matrilines within each pod. As ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Mammal Science
''Marine Mammal Science'' is a quarterly peer-reviewed scientific journal covering all topics about or related to marine mammals. It is published by Wiley-Blackwell on behalf of The Society for Marine Mammalogy. According to the ''Journal Citation Reports'', the journal has a 2015 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a type of journal ranking. Journals with higher impact factor values are considered more prestigious or important within their field. The Impact Factor of a journa ... of 1.665. References External links * Mammalogy journals Academic journals established in 1985 English-language journals Quarterly journals Wiley-Blackwell academic journals {{zoology-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madre Hijo De Orca En El Estrecho
Madre means mother in many Romance languages, and it may also refer to: *Madré, a commune in the Mayenne department of northwestern France *Mądre, a village in the Greater Poland Voivodeship, in west-central Poland *Isola Madre, an Italian island * ''Tillandsia'' 'Madre' *Jean de Madre (1862–1934), English polo player * ''Madre'' (film), a 2016 Colombian short film *''Madre'', a 2016 Chilean horror film written and directed by Aaron Burns * ''Mother'' (2017 Spanish film), a 2017 Spanish short drama film directed by Rodrigo Sorogoyen * ''Mother'' (2019 Spanish film), a 2019 Spanish-French drama film directed by Rodrigo Sorogoyen * ''Madre'' (EP), a 2021 EP by Arca *''Madres'', a 2021 American horror film * ''Madres'' (album), a 2023 album by Sofia Kourtesis See also *Sierra Madre (other) Sierra Madre (Spanish, 'mother mountain range') may refer to: Places and mountains Mexico * Sierra Madre Occidental, a mountain range in northwestern Mexico and southern Arizona * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shetland
Shetland (until 1975 spelled Zetland), also called the Shetland Islands, is an archipelago in Scotland lying between Orkney, the Faroe Islands, and Norway, marking the northernmost region of the United Kingdom. The islands lie about to the northeast of Orkney, from mainland Scotland and west of Norway. They form part of the border between the Atlantic Ocean to the west and the North Sea to the east. The island's area is and the population totalled in . The islands comprise the Shetland (Scottish Parliament constituency), Shetland constituency of the Scottish Parliament. The islands' administrative centre, largest settlement and only burgh is Lerwick, which has been the capital of Shetland since 1708, before which time the capital was Scalloway. Due to its location it is accessible only by ferry or flight with an airport located in Sumburgh as well as a port and emergency airstrip in Lerwick. The archipelago has an oceanic climate, complex geology, rugged coastline, and m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Sea
The North Sea lies between Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium, and France. A sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Sea in the north. It is more than long and wide, covering . It hosts key north European shipping lanes and is a major fishery. The coast is a popular destination for recreation and tourism in bordering countries, and a rich source of energy resources, including wind energy, wind and wave power. The North Sea has featured prominently in geopolitical and military affairs, particularly in Northern Europe, from the Middle Ages to the modern era. It was also important globally through the power northern Europeans projected worldwide during much of the Middle Ages and into the modern era. The North Sea was the centre of the Viking Age, Vikings' rise. The Hanseatic League, the Dutch Golden Age, Dutch Republic, and Kingdom of Great Britain, Brita ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
