Abundance and Distribution of Sperm Whales in the Canary Islands: Can Sperm Whales in the Archipelago Sustain the Current Level of Ship-Strike Mortalities?. Fais, A. A. L., Tim P. AND Zitterbart, D. P. A. Á., & Omar AND Tejedor, A. A. A. S. PLoS ONE, 11(3):1-16, Public Library of Science, 03, 2016. Paper doi abstract bibtex Sperm whales are present in the Canary Islands year-round, suggesting that the archipelago is an important area for this species in the North Atlantic. However, the area experiences one of the highest reported rates of sperm whale ship-strike in the world. Here we investigate if the number of sperm whales found in the archipelago can sustain the current rate of ship-strike mortality. The results of this study may also have implications for offshore areas where concentrations of sperm whales may coincide with high densities of ship traffic, but where ship-strikes may be undocumented. The absolute abundance of sperm whales in an area of 52933 km2, covering the territorial waters of the Canary Islands, was estimated from 2668 km of acoustic line-transect survey using Distance sampling analysis. Data on sperm whale diving and acoustic behaviour, obtained from bio-logging, were used to calculate g(0) = 0.92, this is less than one because of occasional extended periods when whales do not echolocate. This resulted in an absolute abundance estimate of 224 sperm whales (95% log-normal CI 120?418) within the survey area. The recruitment capability of this number of whales, some 2.5 whales per year, is likely to be exceeded by the current ship-strike mortality rate. Furthermore, we found areas of higher whale density within the archipelago, many coincident with those previously described, suggesting that these are important habitats for females and immature animals inhabiting the archipelago. Some of these areas are crossed by active shipping lanes increasing the risk of ship-strikes. Given the philopatry in female sperm whales, replacement of impacted whales might be limited. Therefore, the application of mitigation measures to reduce the ship-strike mortality rate seems essential for the conservation of sperm whales in the Canary Islands.
@ARTICLE{Fais2016,
author = {Fais, Andrea AND Lewis, Tim P. AND Zitterbart, Daniel P. AND Álvarez,
Omar AND Tejedor, Ana AND Aguilar Soto, Natacha},
title = {Abundance and Distribution of Sperm Whales in the Canary Islands:
Can Sperm Whales in the Archipelago Sustain the Current Level of
Ship-Strike Mortalities?},
journal = {PLoS ONE},
year = {2016},
volume = {11},
pages = {1-16},
number = {3},
month = {03},
abstract = {<p>Sperm whales are present in the Canary Islands year-round, suggesting
that the archipelago is an important area for this species in the
North Atlantic. However, the area experiences one of the highest
reported rates of sperm whale ship-strike in the world. Here we investigate
if the number of sperm whales found in the archipelago can sustain
the current rate of ship-strike mortality. The results of this study
may also have implications for offshore areas where concentrations
of sperm whales may coincide with high densities of ship traffic,
but where ship-strikes may be undocumented. The absolute abundance
of sperm whales in an area of 52933 km<sup>2</sup>, covering the
territorial waters of the Canary Islands, was estimated from 2668
km of acoustic line-transect survey using Distance sampling analysis.
Data on sperm whale diving and acoustic behaviour, obtained from
bio-logging, were used to calculate g(0) = 0.92, this is less than
one because of occasional extended periods when whales do not echolocate.
This resulted in an absolute abundance estimate of 224 sperm whales
(95% log-normal CI 120?418) within the survey area. The recruitment
capability of this number of whales, some 2.5 whales per year, is
likely to be exceeded by the current ship-strike mortality rate.
Furthermore, we found areas of higher whale density within the archipelago,
many coincident with those previously described, suggesting that
these are important habitats for females and immature animals inhabiting
the archipelago. Some of these areas are crossed by active shipping
lanes increasing the risk of ship-strikes. Given the philopatry in
female sperm whales, replacement of impacted whales might be limited.
Therefore, the application of mitigation measures to reduce the ship-strike
mortality rate seems essential for the conservation of sperm whales
in the Canary Islands.</p>},
doi = {10.1371/journal.pone.0150660},
file = {:Faisetal2016.pdf:PDF},
owner = {Tiago Marques},
publisher = {Public Library of Science},
subdatabase = {distance},
timestamp = {2016.04.05},
url = {http://dx.doi.org/10.1371%2Fjournal.pone.0150660}
}
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Here we investigate if the number of sperm whales found in the archipelago can sustain the current rate of ship-strike mortality. The results of this study may also have implications for offshore areas where concentrations of sperm whales may coincide with high densities of ship traffic, but where ship-strikes may be undocumented. The absolute abundance of sperm whales in an area of 52933 km<sup>2</sup>, covering the territorial waters of the Canary Islands, was estimated from 2668 km of acoustic line-transect survey using Distance sampling analysis. Data on sperm whale diving and acoustic behaviour, obtained from bio-logging, were used to calculate g(0) = 0.92, this is less than one because of occasional extended periods when whales do not echolocate. This resulted in an absolute abundance estimate of 224 sperm whales (95% log-normal CI 120?418) within the survey area. The recruitment capability of this number of whales, some 2.5 whales per year, is likely to be exceeded by the current ship-strike mortality rate. Furthermore, we found areas of higher whale density within the archipelago, many coincident with those previously described, suggesting that these are important habitats for females and immature animals inhabiting the archipelago. Some of these areas are crossed by active shipping lanes increasing the risk of ship-strikes. Given the philopatry in female sperm whales, replacement of impacted whales might be limited. 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The results of this study\r\n\tmay also have implications for offshore areas where concentrations\r\n\tof sperm whales may coincide with high densities of ship traffic,\r\n\tbut where ship-strikes may be undocumented. The absolute abundance\r\n\tof sperm whales in an area of 52933 km<sup>2</sup>, covering the\r\n\tterritorial waters of the Canary Islands, was estimated from 2668\r\n\tkm of acoustic line-transect survey using Distance sampling analysis.\r\n\tData on sperm whale diving and acoustic behaviour, obtained from\r\n\tbio-logging, were used to calculate g(0) = 0.92, this is less than\r\n\tone because of occasional extended periods when whales do not echolocate.\r\n\tThis resulted in an absolute abundance estimate of 224 sperm whales\r\n\t(95% log-normal CI 120?418) within the survey area. The recruitment\r\n\tcapability of this number of whales, some 2.5 whales per year, is\r\n\tlikely to be exceeded by the current ship-strike mortality rate.\r\n\tFurthermore, we found areas of higher whale density within the archipelago,\r\n\tmany coincident with those previously described, suggesting that\r\n\tthese are important habitats for females and immature animals inhabiting\r\n\tthe archipelago. Some of these areas are crossed by active shipping\r\n\tlanes increasing the risk of ship-strikes. 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