Aguillar, Isabel Cordoba

Bean, Thomas

Culloch, Ross

Eisfeld-Pierantonio, Sonja Mareike

Filan, Miranda

Haskins, Gary

Pierce, Graham

Robinson, Kevin

Sim, Texa

Williams, Genevieve

PLoS ONE

GAMS - Asset Management System for the Humanities

Postkartensammlung GrazMuseumOnline"Graz. Schloßberg."Bildgegenstand: Blick zum Schloßberg mit HauptbrückeInventarnummer: ASK05_02809Typ: AnsichtspostkarteProduktion: UnbekanntDatierung: 05.06.1929 (Poststempel)Technik: PhotochromPostlauf: gelaufenvon Graz nach TeheranFormat/Maße: 9,0x14,0 cmFarbe: farbigBildort: Stadtansicht vom Süden, Hauptbrücke(Historische Bezeichnung: Franz Karl Brücke,Erzherzog-Johann-Brücke)Beschlagwortung: BrückeNummerierung aufKarte:322-1928Archiv: Stadtmuseum Graz/GrazMuseumLizenz: CC BY-SA 3.0 ATPermalink: http://gams.uni-graz.at/o:gm.2809

Graz. Schloßberg.

Kevin P. Robinson

Texa M. C. Sim

Ross M. Culloch

Thomas S. Bean

Isabel Cordoba Aguilar

Sonja M. Eisfeld

Miranda Filan

Gary N. Haskins

Genevieve Williams

Graham J. Pierce

Crossref

Female reproductive success and calf survival in a North Sea coastal bottlenose dolphin (Tursiops truncatus) population

Between-female variation in reproductive output provides a strong measure of individual fitness and a quantifiable measure of the health of a population which may be highly informative to management. In the present study, we examined reproductive traits in female bottlenose dolphins from the east coast of Scotland using longitudinal sightings data collected over twenty years. From a total of 102 females identified between 1997 and 2016, 74 mothers produced a collective total of 193 calves. Females gave birth from 6 to 13 years of age with a mean age of 8. Calves were produced during all study months, May to October inclusive, but showed a seasonal birth pulse corresponding to the regional peak in summer water temperatures. Approximately 83% (n = 116) of the calves of established fate were successfully raised to year 2-3. Of the known mortalities, similar to 45% were first-born calves. Calf survival rates were also lower in multiparous females who had previously lost calves. A mean interbirth interval (IBI) of 3.80 years (n = 110) and mean fecundity of 0.16 was estimated for the population. Calf loss resulted in shortened IBIs, whilst longer IBIs were observed in females assumed to be approaching reproductive senescence. Maternal age and size, breeding experience, dominance, individual associations, group size and other social factors, were all concluded to influence reproductive success (RS) in this population. Some females are likely more important than others for the future viability of the population. Consequently, a better knowledge of the demographic groups containing those females showing higher reproductive success would be highly desirable for conservation efforts aimed at their protection

Robinson, Kevin P.

Sim, Texa M.C.

Culloch, Ross M.

Bean, Thomas S.

Aguilar, Isabel Cordoba

Eisfeld, Sonja M.

Haskins, Gary N.

Pierce, Graham J.

ResearchOnline at James Cook University

English

ResearchOnline@JCU

16 páginas, 7 figuras, 1 tabla.-- This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are creditedBetween-female variation in reproductive output provides a strong measure of individual fitness and a quantifiable measure of the health of a population which may be highly informative to management. In the present study, we examined reproductive traits in female bottlenose dolphins from the east coast of Scotland using longitudinal sightings data collected over twenty years. From a total of 102 females identified between 1997 and 2016, 74 mothers produced a collective total of 193 calves. Females gave birth from 6 to 13 years of age with a mean age of 8. Calves were produced during all study months, May to October inclusive, but showed a seasonal birth pulse corresponding to the regional peak in summer water temperatures. Approximately 83% (n = 116) of the calves of established fate were successfully raised to year 2–3. Of the known mortalities, ~45% were first-born calves. Calf survival rates were also lower in multiparous females who had previously lost calves. A mean inter-birth interval (IBI) of 3.80 years (n = 110) and mean fecundity of 0.16 was estimated for the population. Calf loss resulted in shortened IBIs, whilst longer IBIs were observed in females assumed to be approaching reproductive senescence. Maternal age and size, breeding experience, dominance, individual associations, group size and other social factors, were all concluded to influence reproductive success (RS) in this population. Some females are likely more important than others for the future viability of the population. Consequently, a better knowledge of the demographic groups containing those females showing higher reproductive success would be highly desirable for conservation efforts aimed at their protectionPeer reviewe

Sim, Texa M. C.

Córdoba Aguilar, Isabel

Eisfeld, Sonja

Digital.CSIC

Between-female variation in reproductive output provides a strong measure of individual fitness and a quantifiable measure of the health of a population which may be highly informative to management. In the present study, we examined reproductive traits in female bottlenose dolphins from the east coast of Scotland using longitudinal sightings data collected over twenty years. From a total of 102 females identified between 1997 and 2016, 74 mothers produced a collective total of 193 calves. Females gave birth from 6 to 13 years of age with a mean age of 8. Calves were produced during all study months, May to October inclusive, but showed a seasonal birth pulse corresponding to the regional peak in summer water temperatures. Approximately 83% (n = 116) of the calves of established fate were successfully raised to year 2-3. Of the known mortalities, ~45% were first-born calves. Calf survival rates were also lower in multiparous females who had previously lost calves. A mean inter-birth interval (IBI) of 3.80 years (n = 110) and mean fecundity of 0.16 was estimated for the population. Calf loss resulted in shortened IBIs, whilst longer IBIs were observed in females assumed to be approaching reproductive senescence. Maternal age and size, breeding experience, dominance, individual associations, group size and other social factors, were all concluded to influence reproductive success (RS) in this population. Some females are likely more important than others for the future viability of the population. Consequently, a better knowledge of the demographic groups containing those females showing higher reproductive success would be highly desirable for conservation efforts aimed at their protection

Kevin P Robinson

Texa M C Sim

Ross M Culloch

Thomas S Bean

Sonja M Eisfeld

Gary N Haskins

Graham J Pierce

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Female reproductive success and calf survival in a North Sea coastal bottlenose dolphin (Tursiops truncatus) population.

Between-female variation in reproductive output provides a strong measure of individual fitness and a quantifiable measure of the health of a population which may be highly informative to management. In the present study, we examined reproductive traits in female bottlenose dolphins from the east coast of Scotland using longitudinal sightings data collected over twenty years. From a total of 102 females identified between 1997 and 2016, 74 mothers produced a collective total of 193 calves. Females gave birth from 6 to 13 years of age with a mean age of 8. Calves were produced during all study months, May to October inclusive, but showed a seasonal birth pulse corresponding to the regional peak in summer water temperatures. Approximately 83% (n = 116) of the calves of established fate were successfully raised to year 2-3. Of the known mortalities, ~45% were first-born calves. Calf survival rates were also lower in multiparous females who had previously lost calves. A mean inter-birth interval (IBI) of 3.80 years (n = 110) and mean fecundity of 0.16 was estimated for the population. Calf loss resulted in shortened IBIs, whilst longer IBIs were observed in females assumed to be approaching reproductive senescence. Maternal age and size, breeding experience, dominance, individual associations, group size and other social factors, were all concluded to influence reproductive success (RS) in this population. Some females are likely more important than others for the future viability of the population. Consequently, a better knowledge of the demographic groups containing those females showing higher reproductive success would be highly desirable for conservation efforts aimed at their protection.

Queen's University Belfast Research Portal

http://gams.uni-graz.at/archive/objects/context:gm/methods/sdef:Context/get?mode=impressum

Graz. Schloßberg.

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