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Overcoming Shifting Baselines: Paleo-Behaviour Reveals Industrial Revolution as Tipping Point.
Glob Chang Biol
January 2025
School of Science, Auckland University of Technology, Auckland, New Zealand.
Human activities have significantly altered coastal ecosystems worldwide. The phenomenon of shifting baselines syndrome (SBS) complicates our understanding of these changes, masking the true scale of human impacts. This study investigates the long-term ecological effects of anthropogenic activities on New Zealand's coastal ecosystems over 800 years using fish otolith microchemical profiling and dynamic time warping across an entire stock unit.
View Article and Find Full Text PDFUsing otoliths to understand historic and contemporary selenium exposure in Kokanee Salmon (Oncorhynchus nerka) in Kluane National Park and Reserve, Yukon Territory.
Environ Pollut
January 2025
Wilfrid Laurier University, 75 University Ave W, Waterloo, N2L 3C5, Canada; Department of Biology, University of Waterloo, 200 University Ave W, Waterloo, ON N2L3G1, Canada. Electronic address:
The Kokanee salmon population in Kluane National Park and Reserve (Yukon Territory) declined significantly between 2002 and 2012. Elevated levels of selenium (Se), which can affect fish reproduction, were recently measured in waters used by spawning Kokanee. To investigate whether Se may be contributing to long-term population declines, and in the absence of long-term data on aqueous Se concentrations, Se concentrations in sagittal otoliths - fish ear-bones that chronicle lifetime exposure - were measured and compared in Kokanee sampled in 1981 (a year with many spawners) and 2019-2021.
View Article and Find Full Text PDFMulti-habitat utilization and diverse life history of the endangered Sea Carp (Cyprinus acutidorsalis) in the Wanquan Estuary, Hainan island, China: Evidence from otolith microchemistry.
Mar Environ Res
November 2024
School of Marine Biology and Fisheries, School of Ecology, State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, China. Electronic address:
The Sea Carp Cyprinus acutidorsalis (Wang) is an endemic species limited to a few estuaries in China, uniquely adapted to long-term residence in brackish water environments. This species is endangered due to anthropogenic disturbances, and its life history and habitat use remain poorly understood. This study is the first to investigate the life history and habitat utilization of Sea Carp in the Wanquan Estuary, Hainan Province, China, using otolith microchemistry.
View Article and Find Full Text PDFVariable habitat use supports fine-scale population differentiation of a freshwater piscivore (northern pike, Esox lucius) along salinity gradients in brackish lagoons.
Oecologia
December 2024
Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Müggelseedamm 310, 12587, Berlin, Berlin, Germany.
In mobile animals, selection pressures resulting from spatio-temporally varying ecological factors often drive adaptations in migration behavior and associated physiological phenotypes. These adaptations may manifest in ecologically and genetically distinct ecotypes within populations. We studied a meta-population of northern pike (Esox lucius) in brackish environments and examined intrapopulation divergence along environmental gradients.
View Article and Find Full Text PDFHow well do connectivity tools agree over the full life cycle? A case study of Irish Sea plaice Pleuronectes platessa Linnaeus, 1758.
J Fish Biol
August 2024
Scottish Association for Marine Science (SAMS), Oban, UK.
Adult plaice in the Irish Sea have distinct traits that reflect the spawning locations that could suggest a number of different populations. However, do connectivity pathways support this concept? Different tools are directed at measuring exchange or connectivity between different life-history stages, and the challenge is to integrate the signals to obtain full life-cycle estimates. Collectively, the different methods reveal stable connectivity between known spawning and nursery grounds, with sufficient exchange to maintain a single population with weak genetic structure.
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