Diet composition and food consumption rate of harbor porpoises (Phocoena phocoena ) in the western Baltic Sea

Heidi Andreasen, Stine Dalmann Ross, Ursula Siebert, Niels Gerner Andersen, Katrin Ronnenberg, Anita Gilles

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Stomach content composition and prey-specific consumption rates of juvenile and adult harbor porpoises (Phocoena phocoena) were estimated from a data set including 339 stomachs collected over a 32 yr period (1980–2011) in the western Baltic Sea. The stomach contents were mainly hard parts of fish prey and in particular otoliths. The bias originating from differential residence time of otoliths in the stomachs was addressed by use of a recently developed approach. Atlantic cod and herring were the main prey of adults, constituting on average 70% of the diet mass. Juvenile porpoises also frequently consumed gobies. Here, the mass contribution by gobies was on aver-age 25%, which was as much as cod. Other species such as whiting, sprat, eelpout, and sandeels were of minor importance for both juveniles and adults. The diet compo-
sition differed between years, quarters, and porpoise acquisition method. Yearly consumption rates for porpoises in the western Baltic Sea were obtained in three scenarios on the daily energy requirements of a porpoise in combination with an estimate including the 95% CLs of the porpoise population size. Cod of age groups 1 and 2 and intermediate-sized herring suffered the highest predation from porpoises
Original languageEnglish
JournalMarine Mammal Science
Volume33
Issue number4
Pages (from-to)1053-1079
ISSN0824-0469
DOIs
Publication statusPublished - 2017

Cite this

Andreasen, Heidi ; Ross, Stine Dalmann ; Siebert, Ursula ; Andersen, Niels Gerner ; Ronnenberg, Katrin ; Gilles, Anita. / Diet composition and food consumption rate of harbor porpoises (Phocoena phocoena ) in the western Baltic Sea. In: Marine Mammal Science. 2017 ; Vol. 33, No. 4. pp. 1053-1079.
@article{b8b68efac8f146cba20867ec61d57569,
title = "Diet composition and food consumption rate of harbor porpoises (Phocoena phocoena ) in the western Baltic Sea",
abstract = "Stomach content composition and prey-specific consumption rates of juvenile and adult harbor porpoises (Phocoena phocoena) were estimated from a data set including 339 stomachs collected over a 32 yr period (1980–2011) in the western Baltic Sea. The stomach contents were mainly hard parts of fish prey and in particular otoliths. The bias originating from differential residence time of otoliths in the stomachs was addressed by use of a recently developed approach. Atlantic cod and herring were the main prey of adults, constituting on average 70{\%} of the diet mass. Juvenile porpoises also frequently consumed gobies. Here, the mass contribution by gobies was on aver-age 25{\%}, which was as much as cod. Other species such as whiting, sprat, eelpout, and sandeels were of minor importance for both juveniles and adults. The diet compo-sition differed between years, quarters, and porpoise acquisition method. Yearly consumption rates for porpoises in the western Baltic Sea were obtained in three scenarios on the daily energy requirements of a porpoise in combination with an estimate including the 95{\%} CLs of the porpoise population size. Cod of age groups 1 and 2 and intermediate-sized herring suffered the highest predation from porpoises",
author = "Heidi Andreasen and Ross, {Stine Dalmann} and Ursula Siebert and Andersen, {Niels Gerner} and Katrin Ronnenberg and Anita Gilles",
year = "2017",
doi = "10.1111/mms.12421",
language = "English",
volume = "33",
pages = "1053--1079",
journal = "Marine Mammal Science",
issn = "0824-0469",
publisher = "Wiley-Blackwell",
number = "4",

}

Diet composition and food consumption rate of harbor porpoises (Phocoena phocoena ) in the western Baltic Sea. / Andreasen, Heidi; Ross, Stine Dalmann; Siebert, Ursula; Andersen, Niels Gerner; Ronnenberg, Katrin; Gilles, Anita.

In: Marine Mammal Science, Vol. 33, No. 4, 2017, p. 1053-1079.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Diet composition and food consumption rate of harbor porpoises (Phocoena phocoena ) in the western Baltic Sea

AU - Andreasen, Heidi

AU - Ross, Stine Dalmann

AU - Siebert, Ursula

AU - Andersen, Niels Gerner

AU - Ronnenberg, Katrin

AU - Gilles, Anita

PY - 2017

Y1 - 2017

N2 - Stomach content composition and prey-specific consumption rates of juvenile and adult harbor porpoises (Phocoena phocoena) were estimated from a data set including 339 stomachs collected over a 32 yr period (1980–2011) in the western Baltic Sea. The stomach contents were mainly hard parts of fish prey and in particular otoliths. The bias originating from differential residence time of otoliths in the stomachs was addressed by use of a recently developed approach. Atlantic cod and herring were the main prey of adults, constituting on average 70% of the diet mass. Juvenile porpoises also frequently consumed gobies. Here, the mass contribution by gobies was on aver-age 25%, which was as much as cod. Other species such as whiting, sprat, eelpout, and sandeels were of minor importance for both juveniles and adults. The diet compo-sition differed between years, quarters, and porpoise acquisition method. Yearly consumption rates for porpoises in the western Baltic Sea were obtained in three scenarios on the daily energy requirements of a porpoise in combination with an estimate including the 95% CLs of the porpoise population size. Cod of age groups 1 and 2 and intermediate-sized herring suffered the highest predation from porpoises

AB - Stomach content composition and prey-specific consumption rates of juvenile and adult harbor porpoises (Phocoena phocoena) were estimated from a data set including 339 stomachs collected over a 32 yr period (1980–2011) in the western Baltic Sea. The stomach contents were mainly hard parts of fish prey and in particular otoliths. The bias originating from differential residence time of otoliths in the stomachs was addressed by use of a recently developed approach. Atlantic cod and herring were the main prey of adults, constituting on average 70% of the diet mass. Juvenile porpoises also frequently consumed gobies. Here, the mass contribution by gobies was on aver-age 25%, which was as much as cod. Other species such as whiting, sprat, eelpout, and sandeels were of minor importance for both juveniles and adults. The diet compo-sition differed between years, quarters, and porpoise acquisition method. Yearly consumption rates for porpoises in the western Baltic Sea were obtained in three scenarios on the daily energy requirements of a porpoise in combination with an estimate including the 95% CLs of the porpoise population size. Cod of age groups 1 and 2 and intermediate-sized herring suffered the highest predation from porpoises

U2 - 10.1111/mms.12421

DO - 10.1111/mms.12421

M3 - Journal article

VL - 33

SP - 1053

EP - 1079

JO - Marine Mammal Science

JF - Marine Mammal Science

SN - 0824-0469

IS - 4

ER -