TY - CHAP
T1 - Environmental Effects on Cephalopod Population Dynamics
T2 - Implications for Management of Fisheries
AU - Rodhouse, Paul G. K.
AU - Pierce, Graham J.
AU - Nichols, Owen C.
AU - Sauer, Warwick H. H.
AU - Arkhipkin, Alexander I.
AU - Laptikhovsky, Vladimir V.
AU - Lipinski, Marek R.
AU - Ramos, Jorge E.
AU - Gras, Michael
AU - Kidokoro, Hideaki
AU - Sadayasu, Kazuhiro
AU - Pereira, Joao
AU - Lefkaditou, Evgenia
AU - Pita, Cristina
AU - Gasalla, Maria
AU - Haimovici, Manuel
AU - Sakai, Mitsuo
AU - Downey, Nicola
PY - 2014
Y1 - 2014
N2 - Cephalopods are a relatively small class of molluscs (similar to 800 species), but they support some large industrial scale fisheries and numerous small-scale, local, artisanal fisheries. For several decades, landings of cephalopods globally have grown against a background of total finfish landings levelling off and then declining. There is now evidence that in recent years, growth in cephalopod landings has declined. The commercially exploited cephalopod species are fast-growing, short-lived ecological opportunists. Annual variability in abundance is strongly influenced by environmental variability, but the underlying causes of the links between environment and population dynamics are poorly understood. Stock assessment models have recently been developed that incorporate environmental processes that drive variability in recruitment, distribution and migration patterns. These models can be expected to improve as more, and better, data are obtained on environmental effects and as techniques for stock identification improve. A key element of future progress will be improved understanding of trophic dynamics at all phases in the cephalopod life cycle. In the meantime, there is no routine stock assessment in many targeted fisheries or in the numerous by-catch fisheries for cephalopods. There is a particular need for a precautionary approach in these cases. Assessment in many fisheries is complicated because cephalopods are ecological opportunists and stocks appear to have benefited from the reduction of key predator by overexploitation. Because of the complexities involved, ecosystem-based fisheries management integrating social, economic and ecological considerations is desirable for cephalopod fisheries. An ecological approach to management is routine in many fisheries, but to be effective, good scientific understanding of the relationships between the environment, trophic dynamics and population dynamics is essential. Fisheries and the ecosystems they depend on can only be managed by regulating the activities of the fishing industry, and this requires understanding the dynamics of the stocks they exploit.
AB - Cephalopods are a relatively small class of molluscs (similar to 800 species), but they support some large industrial scale fisheries and numerous small-scale, local, artisanal fisheries. For several decades, landings of cephalopods globally have grown against a background of total finfish landings levelling off and then declining. There is now evidence that in recent years, growth in cephalopod landings has declined. The commercially exploited cephalopod species are fast-growing, short-lived ecological opportunists. Annual variability in abundance is strongly influenced by environmental variability, but the underlying causes of the links between environment and population dynamics are poorly understood. Stock assessment models have recently been developed that incorporate environmental processes that drive variability in recruitment, distribution and migration patterns. These models can be expected to improve as more, and better, data are obtained on environmental effects and as techniques for stock identification improve. A key element of future progress will be improved understanding of trophic dynamics at all phases in the cephalopod life cycle. In the meantime, there is no routine stock assessment in many targeted fisheries or in the numerous by-catch fisheries for cephalopods. There is a particular need for a precautionary approach in these cases. Assessment in many fisheries is complicated because cephalopods are ecological opportunists and stocks appear to have benefited from the reduction of key predator by overexploitation. Because of the complexities involved, ecosystem-based fisheries management integrating social, economic and ecological considerations is desirable for cephalopod fisheries. An ecological approach to management is routine in many fisheries, but to be effective, good scientific understanding of the relationships between the environment, trophic dynamics and population dynamics is essential. Fisheries and the ecosystems they depend on can only be managed by regulating the activities of the fishing industry, and this requires understanding the dynamics of the stocks they exploit.
KW - Cephalopods
KW - Population dynamics
KW - Environment
KW - Fluctuations
KW - Stock assessment
KW - Forecasting
KW - Management
KW - Governance
KW - Loligo-Vulgaris-Reynaudii
KW - Squid Dosidicus-Gigas
KW - Cuttlefish Sepia-Officianalis
KW - Gulf-of-California
KW - Japanese Common Squid
KW - Illex-Argentinus Cephalopoda
KW - Short-Finned Squid
KW - Todarodes-Pacificus Cephalopoda
KW - Calamary Sepioteuthis-Australis
KW - Todaropsis-Eblanae Cephalopoda
U2 - 10.1016/B978-0-12-800287-2.00002-0
DO - 10.1016/B978-0-12-800287-2.00002-0
M3 - Chapter
SN - 978-0-12-800287-2
T3 - Advances in Marine Biology
SP - 99
EP - 233
BT - Advances in Cephalopod Science
A2 - Vidal, EAG
PB - Elsevier Academic Press
CY - San Diego
ER -