Our definition of the word ‘animal’ centers on vertebrates, yet 99% of the animals on the planet are invertebrates, about which we know little. In addition, although the Census of Marine Life (COML.org) has recently conducted an extensive audit of marine ecosystems, we still do not understand much about the animals of the seas. Surveys of the best-known ecosystems, in which invertebrate populations often play a key role, show that the invertebrate populations are affected by human impact. Coral animals are the foundation of coral reef systems, which are estimated to contain 30% of the species in the ocean. Physical impact and chemical changes on the water severely damage these reefs, and may lead to the removal of these important habitats. Tiny pteropod molluscs live in huge numbers in the polar seas, and their fragile shells are particularly vulnerable to ocean acidification. Their removal would mean that fishes on which we depend would have a hugely diminished food supply. In the North Sea, warming is leading to replacement of colder water copepods by warmer water species which contain less fat. This is having an effect on the birds which eat them, who enrich the otherwise poor land on which they nest. Conversely, the warming of the water and the loss of top predators such as whales and sharks has led to an explosion of the jumbo squid of the Pacific coast of North America. This is positive in the development of a squid fishery, yet negative because the squid eat fish that have been the mainstay of the fishery along that coast. These examples show how invertebrates are key in the oceans, and what might happen when global changes impact them.
References
[1]
Nash, S. Desperately seeking charisma: Improving the status of invertebrates. Bioscience 2004, 54, 487–494, doi:10.1641/0006-3568(2004)054[0487:DSCITS]2.0.CO;2.
[2]
Kellert, S.R. Values and perceptions of invertebrates. Conserv. Biol. 1993, 7, 845–855.
[3]
Ponder, W.F. Bias and biodiversity. Aust. Zool. 1992, 28, 47–51.
[4]
O’Dor, R.; Vanden Berghe, E. Hidden Beneath the Seas; World Policy Institute: New York, NY, USA, 2012; pp. 101–108.
[5]
O’Dor, R.; Acosta, J.; Aksel Bergstad, O.; Brainard, R.; Brattey, J.; Canals, M.; Costa, D.; Gjerde, K.; Gunn, J.; Horne, J.K.; Iken, K.; Kocik, J.; Konar, B.; Payne, J.; Reid, C.; Robison, B.; Steinke, D.; Vanden Berge, E. Bringing Life to Ocean Observation. In Proceedings of OceanObs’09: Sustained Ocean Observations and Information for Society, Venice, Italy, 21–25 September 2009.
[6]
Pechenik, J.A. Biology of the Invertebrates, 4th ed.; McGraw-Hill Press: Boston, MA, USA, 2000.
[7]
Knowlton, N.; Brainard, R.E.; Fisher, R.; Moews, M.; Plaisance, L.; Caley, M.J. Coral reef biodiversity. In Life in the World’s Oceans: Diversity, Distribution and Abundance; McIntyre, A., Ed.; Wiley-Blackwell: West Sussex, UK, 2010; pp. 65–78.
[8]
Knowlton, N.; Jackson, J.B.C. Shifting baselines, local impacts, and global changes on coral reefs. PLoS Biol. 2008, 6, doi:10.1371/journal.pbio.0060054.
[9]
Fabry, V.J.; Seibel, B.A.; Feely, R.A.; Orr, J.C. Impacts of ocean acidification on marine fauna and ecosystem processes. ICES J. Mar. Sci. 2008, 65, 414–432, doi:10.1093/icesjms/fsn048.
[10]
Guinotte, J.M.; Fabry, V. Ocean acidification and its potential effects on marine ecosystems. Ann. N. Y. Acad. Sci. 2008, 1134, 320–342.
[11]
Bucklin, A.; Nishida, S.; Schnack-Schiel, S.; Wiebe, P.H.; Lindsay, D.; Machida, R.J.; Copley, N.J. A census of zooplankton of the global ocean. In Life in the World’s Oceans: Diversity, Distribution and Abundance; McIntyre, A., Ed.; Wiley-Blackwell: West Sussex, UK, 2010; pp. 247–266.
[12]
Comeau, S.; Gorsky, G.; Jeffree, R.; Teyssie, J.-L.; Gattuso, J.-P. Impact of ocean acidification on a key Arctic pelagic mollusk (Limacina helicina). Biogeosciences 2009, 6, 1877–1882, doi:10.5194/bg-6-1877-2009.
[13]
Lischka, S.; Budenbender, J.; Boxhammer, T.; Riebesell, U. Impact of ocean acidification and elevated temperatures on early juveniles of the polar shelled pteropod Limacina helicina: Mortality, shell degradation, and shell growth. Biogeosci. Discuss. 2010, 7, 8177–8214, doi:10.5194/bgd-7-8177-2010.
[14]
Stirling, I.; Parkinson, C. Possible effects of climate warming on selected populations of polar bears (Ursus maratimus) in the Canadian Arctic. Arctic 2006, 59, 261–275.
[15]
Beaugrand, G.; Reid, P.C.; Ibanez, F.; Lindsay, J.A.; Edwards, M. Reorganization of north Atlantic marine copepod biodiversity and climate. Science 2002, 296, 1692–1694, doi:10.1126/science.1071329.
[16]
Stempniewicz, L.; Blachowiak-Samolyk, K.; Weslawski, J.M. Impact of climate change on zooplankton communities, seabird populations and Arctic terrestrial ecosystem—A scenario. Deep-Sea Res. 2007, 54, 2934–2945, doi:10.1016/j.dsr2.2007.08.012.
[17]
Incze, L.S.; Lawton, P.; Ellis, S.L.; Wolff, N.H. Biodiversity knowledge and its application in the Gulf of Maine area. In Life in the World’s Oceans: Diversity, Distribution and Abundance; McIntyre, A., Ed.; Wiley-Blackwell: West Sussex, UK, 2010; pp. 41–64.
Rosas-Luis, R.; Salinas-Zavala, C.A.; Koch, V.; Del Monte Luna, P.; Morales-Zarate, M.V. Importance of jumbo squid Dosidicus gigas (Orbigny, 1835) in the pelagic ecosystem of the central Gulf of California. Ecol. Mod. 2008, 218, 149–161, doi:10.1016/j.ecolmodel.2008.06.036.
Davis, R.W.; Jacquet, N.; Markaida, U.; Bazzino, G.; Gilly, W. Diving behavior of sperm whales in relation to behavior of a major prey species, the jumbo squid, in the Gulf of California, Mexico. Mar. Ecol. Prog. Ser. 2007, 333, 291–302, doi:10.3354/meps333291.
[22]
Zeidberg, L.D.; Robison, B.H. Invasive range expansion by the Humboldt squid, Dosidicus gigas, in the eastern North Pacific. PNAS 2007, 104, 12948–12950, doi:10.1073/pnas.0702043104.
