Best,P.B.
Increase rates in severely depleted stocks of baleen whales Journal Article
In: ICES Journal of Marine Science, vol. 50, no. 43, pp. 169-186, 1993.
Abstract | BibTeX | Tags: abundance, Arabian Sea, baleen whales, historical whaling, population estimates, Stock identity, whaling
@article{,
title = {Increase rates in severely depleted stocks of baleen whales},
author = {Best,P.B.},
year = {1993},
date = {1993-01-01},
journal = {ICES Journal of Marine Science},
volume = {50},
number = {43},
pages = {169-186},
abstract = {The paper tries to examine the status of all known stocks of baleen whales that were depleted to an estimated 10% of their original abundance. Of 44 such stocks, 18 are classified as not feasible to monitor (including Arabian Sea humpbacks), 12 have been or are being monitored (at the time of writing), and increase rates have been demonstrated for 10 of those. The author concludes that more depleted stocks show higher rates of increase than less depleted stocks, and that most populations are reaching a size which would allow harvesting (a minimum of 60% of their pre-exploitation numbers according to the IWC). The paper points out some interesting problems with the use of historical whaling data and mark-recapture in estimating fecundity rates. It also suggests that population increases were not detected in the years immediately following protection for two reasons: 1) commercial catches were underreported and initial post-whaling population estimates were too high, 2) following population decreases, whales may condense their ranges, leaving some historical feeding or breeding sites to form concentration areas, some of which were only recently discovered.},
keywords = {abundance, Arabian Sea, baleen whales, historical whaling, population estimates, Stock identity, whaling},
pubstate = {published},
tppubtype = {article}
}
The paper tries to examine the status of all known stocks of baleen whales that were depleted to an estimated 10% of their original abundance. Of 44 such stocks, 18 are classified as not feasible to monitor (including Arabian Sea humpbacks), 12 have been or are being monitored (at the time of writing), and increase rates have been demonstrated for 10 of those. The author concludes that more depleted stocks show higher rates of increase than less depleted stocks, and that most populations are reaching a size which would allow harvesting (a minimum of 60% of their pre-exploitation numbers according to the IWC). The paper points out some interesting problems with the use of historical whaling data and mark-recapture in estimating fecundity rates. It also suggests that population increases were not detected in the years immediately following protection for two reasons: 1) commercial catches were underreported and initial post-whaling population estimates were too high, 2) following population decreases, whales may condense their ranges, leaving some historical feeding or breeding sites to form concentration areas, some of which were only recently discovered.
Wray,P.,Martin,K.R.
Historical Whaling Records from the Western Indian Ocean Book
International Whaling Commission, 1980.
Abstract | BibTeX | Tags: 19th century, Arabian region, Blue whale, blue whales, historical whaling, humpback whales, Indian Ocean, Oman, sperm whales, whaling, Yankee whaling
@book{,
title = {Historical Whaling Records from the Western Indian Ocean},
author = {Wray,P.,Martin,K.R.},
year = {1980},
date = {1980-01-01},
journal = {Report to the International Whaling Commission, Special issue 5: Special Issue on Historical Whaling Records.},
number = {511},
pages = {213-241},
publisher = {International Whaling Commission},
abstract = {Preliminary data from 19th century whaling in the western Indian Ocean is presented, including summary of effort by whaling grounds and by species. Catch data from 27 voyages (1800-88) is summarised with comments on the possibility of overfishing of sperm and right whales in the region. Humpback whales were taken opportunistically in Madagascar and Mozambique but were not reported for the Northern Arabian Sea. Sperm whales were taken between September and January in the "Arabian Grounds" (including Arabian Sea coasts of Oman and Yemen). Blue whales were seen on the Arabian grounds from September through November. One blue whale was taken from the Kuria Muria Islands in Dec 1868.},
keywords = {19th century, Arabian region, Blue whale, blue whales, historical whaling, humpback whales, Indian Ocean, Oman, sperm whales, whaling, Yankee whaling},
pubstate = {published},
tppubtype = {book}
}
Preliminary data from 19th century whaling in the western Indian Ocean is presented, including summary of effort by whaling grounds and by species. Catch data from 27 voyages (1800-88) is summarised with comments on the possibility of overfishing of sperm and right whales in the region. Humpback whales were taken opportunistically in Madagascar and Mozambique but were not reported for the Northern Arabian Sea. Sperm whales were taken between September and January in the "Arabian Grounds" (including Arabian Sea coasts of Oman and Yemen). Blue whales were seen on the Arabian grounds from September through November. One blue whale was taken from the Kuria Muria Islands in Dec 1868.