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Deep-sea gigantism

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eggs or larvae, another possible advantage is that larger offspring, with greater initial stored food reserves, can drift for greater distances. As an example of adaptations to this situation, giant isopods gorge on food when available, distending their bodies to the point of compromising ability to
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The proposed theory behind this trend is that deep-sea gigantism could be an adaptive trait to combat asphyxiation in ocean waters. Larger organisms are able to intake more dissolved oxygen within the ocean, allowing for sufficient respiration. However, this increased absorption of oxygen runs the
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is the tendency for species of deep-sea dwelling animals to be larger than their shallower-water relatives across a large taxonomic range. Proposed explanations for this type of gigantism include necessary adaptation to colder temperature, food scarcity, reduced predation pressure and increased
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crustaceans found that maximum potential organism size directly correlates with increased dissolved oxygen levels of deeper waters. The solubility of dissolved oxygen in the oceans is known to increase with depth because of increasing pressure, decreasing salinity levels and temperature.
253:): both trends involve increasing size with decreasing temperature. The trend with latitude has been observed in some of the same groups, both in comparisons of related species, as well as within widely distributed species. Decreasing temperature is thought to result in increased 118:
Other attain under them gigantic proportions. It is especially certain crustacea which exhibit this latter peculiarity, but not all crustacea, for the crayfish like forms in the deep sea are of ordinary size. I have already referred to a gigantic
483: 466: 396: 443: 416: 962: 261:(the latter also being associated with delayed sexual maturity), both of which lead to an increase in maximum body size (continued growth throughout life is characteristic of crustaceans). In 827:
Gad, G. (2005). "Giant Higgins-larvae with paedogenetic reproduction from the deep sea of the Angola Basin? Evidence for a new life cycle and for abyssal gigantism in Loricifera?".
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Food scarcity at depths greater than 400 m is also thought to be a factor, since larger body size can improve ability to forage for widely scattered resources. In organisms with
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Lutz, R. A.; Shank, T. M.; Fornari, D. J.; Haymon, R. M.; Lilley, M. D.; Von Damm, K. L.; Desbruyeres, D. (1994). "Rapid growth at deep-sea vents".
296:. The former, however, has rapid growth rates and short life spans of about 2 years, while the latter is slow growing and may live over 250 years. 269:
seas where there is a reduced vertical temperature gradient, there is also a reduced trend towards increased body size with depth, arguing against
1708: 595:"The relationship between dissolved oxygen concentration and maximum size in deep-sea turrid gastropods: an application of quantile regression" 245:
In crustaceans, it has been proposed that the explanation for the increase in size with depth is similar to that for the increase in size with
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scales to roughly the ¾ power of its mass. Under conditions of limited food supply, this may provide additional benefit to large size.
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Genes increase in frequency when relatedness of recipient to actor times benefit to recipient exceeds reproductive cost to actor
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risk of toxicity poisoning where an organism can have oxygen levels that are so high that they become harmful and poisonous.
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found that predation was nearly an order of magnitude less frequent at the greatest depths than in shallow waters.
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The correlation between the size of an animal and its diet quality; larger animals can consume lower quality diet
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Sexual size dimorphism increases with size when males are larger, decreases with size when females are larger
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A population at limit of tolerance in one aspect is vulnerable to small differences in any other aspect
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Groups evolve from character variation in primitive species to a fixed character state in advanced ones
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Dissolved oxygen levels are also thought to play a role in deep-sea gigantism. A 1999 study of benthic
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communities at ambient temperatures of 2–30 °C, reaches lengths of 2.7 m, comparable to those of
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Temperature does not appear to have a similar role in influencing the size of giant tube worms.
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Timofeev, S. F. (2001). "Bergmann's Principle and Deep-Water Gigantism in Marine Crustaceans".
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In cladistics, the most primitive species are found in earliest, central, part of group's area
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An additional possible influence is reduced predation pressure in deeper waters. A study of
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Embryos start from a common form and develop into increasingly specialised forms
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Tendency for deep-sea species to be larger than their shallower-water relatives
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A. Milne Edwards, 1879 (Flabellifera: Cirolanidae), off the Yucatan Peninsula"
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Inverse relationship between water temperature and no. of fin rays, vertebrae
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dredged a gigantic Isopod 11 inches in length. We also dredged a gigantic
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Parts in an organism become reduced in number and specialized in function
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Small species get larger, large species smaller, after colonizing islands
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Large ectothermic animals more easily maintain constant body temperature
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No. of eggs of benthic marine invertebrates decreases with latitude
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locomote; they can also survive 5 years without food in captivity.
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jellyfish, which can grow up to 10 m (33 ft) in length.
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whose outstretched legs measured 3.7 m (12 ft) across.
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Hybrid sexes that are absent, rare, or sterile, are heterogamic
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Insect social parasites are often in same genus as their hosts
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Notable organisms that exhibit deep-sea gigantism include the
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Briones-Fourzán, Patricia; Lozano-Alvarez, Enrique (1991).
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Probability of extinction of a group is constant over time
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The top of an animals coloration is darker than the bottom
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Birds lay only as many eggs as they can provide food for
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Kleiber, M. (1947). "Body Size and Metabolic Rate".
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Deep-sea gigantism is not generally observed in the
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Biology Bulletin of the Russian Academy of Sciences
62:in general, as well as the inaccessibility of the 1516:An animals metabolic rate decreases with its size 1303:Science Daily: Midgets and giants in the deep sea 1226:Verberk, Wilco C. E. P.; Atkinson, David (2013). 1170:"Polar gigantism dictated by oxygen availability" 803:"Amazing specimen of world's largest squid in NZ" 58:. The harsh conditions and inhospitality of the 116: 1675:Where genetics opposes environment as a factor 1437:Host and parasite phylogenies become congruent 1323: 1116: 1114: 676: 674: 672: 670: 8: 1476:Lighter coloration in colder, drier climates 993:"Aspects of the biology of the giant isopod 1168:Chapelle, Gauthier; Peck, Lloyd S. (1999). 1496:Parasites co-vary in size with their hosts 1330: 1316: 1308: 796: 794: 553: 551: 549: 547: 545: 1566:Latitudinal range increases with latitude 1259: 1149: 1014: 822: 820: 818: 816: 774: 70:, have hindered the study of this topic. 857:The biology of vestimentiferan tubeworms 593:C., McClain; M., Rex (1 October 2001). 541: 356: 25:Examination of a 9 m (30 ft) 1407:Loss of complex traits is irreversible 1357:Shorter appendages in colder climates 1221: 1219: 1163: 1161: 187:, and a number of squid species: the 7: 1038:Gallagher, Jack (26 February 2013). 683:"Why isn't the Giant Isopod larger?" 1466:Complete competitors cannot coexist 1367:Extra limbs mirror their neighbours 854:Bright, M.; Lallier, F. H. (2010). 829:Organisms Diversity & Evolution 1417:Parasites co-vary with their hosts 801:Anderton, Jim (22 February 2007). 681:McClain, Craig (14 January 2015). 14: 1397:Larger bodies in deep-sea animals 809:from the original on 23 May 2010. 1655: 1377:Larger bodies in colder climates 482: 464: 442: 415: 395: 379: 359: 1130:Global Ecology and Biogeography 429:, washed up on the beach of a 273:being an important parameter. 1: 1709:Evolutionary biology concepts 1097:10.1152/physrev.1947.27.4.511 1002:Journal of Crustacean Biology 455:sea spider, displayed at the 743:forages on gelatinous fauna" 739:"The giant deep-sea octopus 191:(up to 14 m in length), the 1387:Bodies get larger over time 1735: 954:MacDonald, Ian R. (2002). 805:. New Zealand Government. 336:Increased dissolved oxygen 324:Reduced predation pressure 110:, and eels from the order 1672:Countergradient variation 1653: 1522:Hennig's progression rule 841:10.1016/j.ode.2004.10.005 422:A 7 m (23 ft) 1252:10.1111/1365-2435.12152 1064:. NPR. 22 February 2014 572:10.1023/A:1012336823275 431:Navy SEAL training base 1124:; Peck, L. S. (2016). 289:Lamellibrachia luymesi 198:Megalocranchia fisheri 143: 139:Henry Nottidge Moseley 60:underwater environment 54:concentrations in the 34: 1532:Jarman–Bell principle 1085:Physiological Reviews 873:10.1201/ebk1439821169 619:10.1007/s002270100617 452:Colossendeis colossea 404:robust clubhook squid 203:robust clubhook squid 24: 995:Bathynomus giganteus 867:. pp. 213–266. 865:Taylor & Francis 741:Haliphron atlanticus 707:Smithsonian Oceans. 388:Japanese spider crab 372:Bathynomus giganteus 318:basal metabolic rate 271:hydrostatic pressure 173:Japanese spider crab 134:Bathynomus giganteus 66:for most human-made 1719:Ecogeographic rules 1244:2013FuEco..27.1275V 1186:1999Natur.399..114C 1142:2016GloEB..25..670H 925:1994Natur.371..663L 759:2017NatSR...744952H 709:"Big Red Jellyfish" 611:2001MarBi.139..681C 257:size and increased 68:underwater vehicles 1592:Schmalhausen's law 1393:Deep-sea gigantism 1232:Functional Ecology 972:on 1 February 2017 892:on 31 October 2013 747:Scientific Reports 733:Hoving, H. J. T.; 713:Smithsonian Oceans 654:MysteriousUniverse 491:deepwater stingray 207:Dana octopus squid 181:deepwater stingray 43:deep-sea gigantism 35: 1691: 1690: 1447:Insular gigantism 1433:Fahrenholz's rule 1180:(6732): 114–115. 1151:10.1111/geb.12444 1042:. The Japan Times 882:978-1-4398-2116-9 767:10.1038/srep44952 737:(27 March 2017). 735:Haddock, S. H. D. 525:Largest organisms 292:, which lives in 284:hydrothermal vent 282:, which lives in 279:Riftia pachyptila 241:Lower temperature 215:giant warty squid 185:seven-arm octopus 147:big red jellyfish 47:abyssal gigantism 1726: 1714:Marine organisms 1684: 1676: 1659: 1648: 1647: 1638: 1637: 1628: 1627: 1618: 1617: 1608: 1607: 1598: 1597: 1588: 1587: 1578: 1577: 1568: 1567: 1558: 1557: 1552:Lack's principle 1548: 1547: 1538: 1537: 1528: 1527: 1518: 1517: 1508: 1507: 1498: 1497: 1488: 1487: 1478: 1477: 1468: 1467: 1458: 1457: 1451:Insular dwarfism 1439: 1438: 1429: 1428: 1419: 1418: 1409: 1408: 1399: 1398: 1389: 1388: 1379: 1378: 1369: 1368: 1359: 1358: 1339:Biological rules 1332: 1325: 1318: 1309: 1290: 1289: 1263: 1238:(6): 1275–1285. 1223: 1214: 1213: 1165: 1156: 1155: 1153: 1118: 1109: 1108: 1080: 1074: 1073: 1071: 1069: 1058: 1052: 1051: 1049: 1047: 1035: 1029: 1028: 1018: 988: 982: 981: 979: 977: 971: 965:. Archived from 960: 951: 945: 944: 933:10.1038/371663a0 908: 902: 901: 899: 897: 891: 885:. 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Index


giant squid
Norway
zoology
dissolved oxygen
deep sea
underwater environment
abyssal zone
underwater vehicles
crustaceans
mysids
euphausiids
decapods
isopods
amphipods
cephalopods
cnidarians
Anguilliformes
Pycnogonid
Louis Agassiz
Ostracod
Bathynomus giganteus
Henry Nottidge Moseley
big red jellyfish
Stygiomedusa
giant isopod
giant ostracod
giant sea spider
giant amphipod
Japanese spider crab

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