Environmental influences on tooth growth in sperm whales from southern Australia

Hamilton, Vicki; Evans, Karen; Raymond, Ben; Hindell, Mark A.

doi:10.1016/j.jembe.2013.05.031

Cited by 11 publications

(3 citation statements)

References 42 publications

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“…In addition, other intrinsic and extrinsic events or signals may be recorded within dentin [ 3 , 15 ]. In cetaceans, information shown to have been recorded in dentin include: birth [ 15 – 17 ]; sexual maturity [ 18 – 21 ], weaning [ 20 , 21 ] lactation [ 22 ], and environmental events [ 23 – 25 ]. Thus understanding the temporal framework of growth layers in dentin is the first step in placing these other signals in a usable context.…”

Section: Introductionmentioning

confidence: 99%

Validation of Growth Layer Group (GLG) depositional rate using daily incremental growth lines in the dentin of beluga (Delphinapterus leucas (Pallas, 1776)) teeth

et al. 2018

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Counts of Growth Layer Groups (GLGs) in the dentin of marine mammal teeth are widely used as indicators of age. In most marine mammals, observations document that GLGs are deposited yearly, but in beluga whales, some studies have supported the view that two GLGs are deposited each year. Our understanding of beluga life-history differs substantially depending on assumptions regarding the timing of GLG deposition; therefore, resolving this issue has important considerations for population assessments. In this study, we used incremental lines that represent daily pulses of dentin mineralization to test the hypothesis that GLGs in beluga dentin are deposited on a yearly basis. Our estimate of the number of daily growth lines within one GLG is remarkably close to 365 days within error, supporting the hypothesis that GLGs are deposited annually in beluga. We show that measurement of daily growth increments can be used to validate the time represented by GLGs in beluga. Furthermore, we believe this methodology may have broader applications to age estimation in other taxa.

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Section: Introductionmentioning

confidence: 99%

Validation of Growth Layer Group (GLG) depositional rate using daily incremental growth lines in the dentin of beluga (Delphinapterus leucas (Pallas, 1776)) teeth

et al. 2018

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“…The analysis of annual growth increment patterns or 'growth chronologies' can thus be used to reconstruct continuous, annually resolved growth histories of individuals and populations (e.g. Black et al 2011;Hamilton et al 2013;Kendall et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Long-term patterns in estuarine fish growth across two climatically divergent regions

et al. 2015

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Long-term ecological datasets are vital for investigating how species respond to changes in their environment, yet there is a critical lack of such datasets from aquatic systems. We developed otolith growth 'chronologies' to reconstruct the growth history of a temperate estuarine fish species, black bream (Acanthopagrus butcheri). Chronologies represented two regions in south-east Australia: South Australia, characterised by a relatively warm, dry climate, and Tasmania, characterised by a relatively cool, wet climate. Using a mixed modelling approach, we related inter-annual growth variation to air temperature, rainfall, freshwater inflow (South Australia only), and El Niño-Southern Oscillation events. Otolith chronologies provided a continuous record of growth over a 13- and 21-year period for fish from South Australia and Tasmania, respectively. Even though fish from Tasmania were sourced across multiple estuaries, they showed higher levels of growth synchronicity across years, and greater year-to-year growth variation, than fish from South Australia, which were sourced from a single, large estuary. Growth in Tasmanian fish declined markedly over the time period studied and was negatively correlated to temperature. In contrast, growth in South Australian fish was positively correlated to both temperature and rainfall. The stark contrast between the two regions suggests that Tasmanian black bream populations are more responsive to regional scale environmental variation and may be more vulnerable to global warming. This study highlights the importance of examining species response to climate change at the intra-specific level and further validates the emerging use of growth chronologies for generating long-term ecological data in aquatic systems.

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“…Teeth were prepared according to Evans and Robertson (2001). Etched tooth sections were then photographed following Hamilton et al (2013) and dentinal GLGs identified on the digital images. Each GLG was defined as comprising a pair of alternating ridges and grooves (Perrin and Myrick 1980).…”

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confidence: 99%

From the forests to teeth: Visual crossdating to refine age estimates in marine mammals

Hamilton

Evans

Hindell

2017

Marine Mammal Science

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Environmental influences on tooth growth in sperm whales from southern Australia

Cited by 11 publications

References 42 publications

Validation of Growth Layer Group (GLG) depositional rate using daily incremental growth lines in the dentin of beluga (Delphinapterus leucas (Pallas, 1776)) teeth

Validation of Growth Layer Group (GLG) depositional rate using daily incremental growth lines in the dentin of beluga (Delphinapterus leucas (Pallas, 1776)) teeth

Long-term patterns in estuarine fish growth across two climatically divergent regions

From the forests to teeth: Visual crossdating to refine age estimates in marine mammals

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