From coral reefs to whale teeth: estimating mortality from natural accumulations of skeletal materials

Abstract

Estimation of natural and anthropogenic (fishing, hunting) mortality is the key problem in studies of population dynamics. Numerous theoretical approaches were developed in environmental sciences to find a solution based on information that could be obtained from live representatives of populations of interest. We review the alternative methods used by marine biologists, palaeontologists and zoo-archaeologists to estimate natural and anthropogenic mortality from age-registering structures of the different taxa (corals, molluscs, fishes and mammals) collected in thanatocoenoses and containing information about the exact individual age-at-death. Not all approaches and techniques are transferrable from one field to another because they were elaborated for organisms with different morphologies and ecologies, but cross-fertilisation of ideas presented in this review might provide a new insight into studies related to population dynamics.

Future Directions in Research on Beaked Whales

“…The development of molecular age biomarkers, or measurable changes in DNA or RNA abundance or sequence change with time, provides a new way to estimate chronological age (Jarman et al, 2015). Such tools could be validated using both knownage animals from long-term study sites and from stranded animals aged using skeletal materials or natural chemical markers (Polanowski et al, 2014;Laptikhovsky et al, 2018).…”