Variation in Timing of Conception between Populations of the Harbor Porpoise
We examined reproductive seasonality in 2 populations of the harbor porpoise ( Phocoena phocoena ) in the eastern and western North Atlantic Ocean and compared our observations with historical data from the Baltic and North seas. Dates of conception for individuals were back-calculated from fetal si...
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2003
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fthighwire:oai:open-archive.highwire.org:jmammal:84/3/948 2023-05-15T17:33:07+02:00 Variation in Timing of Conception between Populations of the Harbor Porpoise BÖrjesson, Patrik Read, Andrew J. 2003-08-29 00:00:00.0 text/html http://jmammal.oxfordjournals.org/cgi/content/short/84/3/948 https://doi.org/10.1644/BEM-016 en eng Oxford University Press http://jmammal.oxfordjournals.org/cgi/content/short/84/3/948 http://dx.doi.org/10.1644/BEM-016 Copyright (C) 2003, Oxford University Press Feature Articles TEXT 2003 fthighwire https://doi.org/10.1644/BEM-016 2018-04-07T06:31:37Z We examined reproductive seasonality in 2 populations of the harbor porpoise ( Phocoena phocoena ) in the eastern and western North Atlantic Ocean and compared our observations with historical data from the Baltic and North seas. Dates of conception for individuals were back-calculated from fetal size and an estimated fetal growth rate of 83 mm/month. Mean conception date was 6 July ± 9.5 days ( SD ) in the Bay of Fundy and Gulf of Maine and 25 July ± 20.3 days in the Kattegat and Skagerrak seas. Timing of conception did not differ between the Kattegat and Skagerrak and the North seas but was significantly earlier there than in the Baltic Sea (18 August ± 11.8 days). Based on mean body size at birth (a mass of 6,025 ± 440 g and a length of 762 ± 54 mm), gestation was estimated to last for approximately 10.4 months. We hypothesize that differences in mating seasons reflect seasonal patterns in distribution and behavior of prey, so calves are born when maternal prey is abundant and is of high quality. Text North Atlantic Phocoena phocoena HighWire Press (Stanford University) Kattegat ENVELOPE(9.692,9.692,63.563,63.563) Journal of Mammalogy 84 3 948 955 |
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Open Polar |
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HighWire Press (Stanford University) |
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fthighwire |
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English |
topic |
Feature Articles |
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Feature Articles BÖrjesson, Patrik Read, Andrew J. Variation in Timing of Conception between Populations of the Harbor Porpoise |
topic_facet |
Feature Articles |
description |
We examined reproductive seasonality in 2 populations of the harbor porpoise ( Phocoena phocoena ) in the eastern and western North Atlantic Ocean and compared our observations with historical data from the Baltic and North seas. Dates of conception for individuals were back-calculated from fetal size and an estimated fetal growth rate of 83 mm/month. Mean conception date was 6 July ± 9.5 days ( SD ) in the Bay of Fundy and Gulf of Maine and 25 July ± 20.3 days in the Kattegat and Skagerrak seas. Timing of conception did not differ between the Kattegat and Skagerrak and the North seas but was significantly earlier there than in the Baltic Sea (18 August ± 11.8 days). Based on mean body size at birth (a mass of 6,025 ± 440 g and a length of 762 ± 54 mm), gestation was estimated to last for approximately 10.4 months. We hypothesize that differences in mating seasons reflect seasonal patterns in distribution and behavior of prey, so calves are born when maternal prey is abundant and is of high quality. |
format |
Text |
author |
BÖrjesson, Patrik Read, Andrew J. |
author_facet |
BÖrjesson, Patrik Read, Andrew J. |
author_sort |
BÖrjesson, Patrik |
title |
Variation in Timing of Conception between Populations of the Harbor Porpoise |
title_short |
Variation in Timing of Conception between Populations of the Harbor Porpoise |
title_full |
Variation in Timing of Conception between Populations of the Harbor Porpoise |
title_fullStr |
Variation in Timing of Conception between Populations of the Harbor Porpoise |
title_full_unstemmed |
Variation in Timing of Conception between Populations of the Harbor Porpoise |
title_sort |
variation in timing of conception between populations of the harbor porpoise |
publisher |
Oxford University Press |
publishDate |
2003 |
url |
http://jmammal.oxfordjournals.org/cgi/content/short/84/3/948 https://doi.org/10.1644/BEM-016 |
long_lat |
ENVELOPE(9.692,9.692,63.563,63.563) |
geographic |
Kattegat |
geographic_facet |
Kattegat |
genre |
North Atlantic Phocoena phocoena |
genre_facet |
North Atlantic Phocoena phocoena |
op_relation |
http://jmammal.oxfordjournals.org/cgi/content/short/84/3/948 http://dx.doi.org/10.1644/BEM-016 |
op_rights |
Copyright (C) 2003, Oxford University Press |
op_doi |
https://doi.org/10.1644/BEM-016 |
container_title |
Journal of Mammalogy |
container_volume |
84 |
container_issue |
3 |
container_start_page |
948 |
op_container_end_page |
955 |
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1766131515044921344 |