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Riekenberg*1 , Lonneke L. IJsseldijk2 , Mardik F. Leopold3 , Jens T. Christensen4 , Andrea Gröne2 , Marcel T.J. van der Meer1  \n1. NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry  \n2. Utrecht University, Faculty of Veterinary Medicine, Division of Pathology  \n3. Wageningen Marine Research, Wageningen University and Research  \n4. Aarhus University, Department of Biology  \nAnimal tissues incorporate the stable nitrogen isotopic composition from underlying resources used into their biomass with a fractionation due to metabolism. These tissues reflect the baseline nitrogen isotope values supporting primary producers, the animal’s position within the food web, and metabolism associated with tissue specific metabolic pathways. Within a long-lived tissue such as bone, collagen remains well preserved after death, allowing for the possibility of investigating long term ecosystem states through analysis of bones of known provenance. Here, collagen sourced from a museum archive and the tissue bank of the Dutch Stranding Network (n=170) were analyzed for nitrogen and carbon isotope ratios from bulk material and amino acids across historical (1950-2001) and recent (2009-2021) time periods. These results allow: 1) ID of modern and historical trophic position for harbour porpoise, 2) inference of ecosystem impacts that have led to changes in baseline nitrogen and trophic structure in the North Sea, and 3) ID of the dominant microbial support for food web carbon. Application of amino acids to provide a baseline integrated trophic position will provide a valuable multi-decadal baseline as well as trophic position for comparison against the more recent archive (2009-2021) . The long history of industrial overfishing in the North Sea confounds interpretation of the multiple regime shifts and the multi-decadal impacts from climate change. We anticipate that integration of baseline changes across the 75-year period provides an opportunity to resolve the multiple anthropogenic stressors impacting the harbor porpoise’s place in the food web structure in the North Sea.  \nABSTRACT 002  \nLate Holocene Nearshore Marine Productivity Record, Climate Change, & Sociopolitical Dynamics on California’s Northern Channel Islands  \nVokhshoori N. L.1 , Rick T.2 , Braje T.3 , France, C.4 , McCarthy M. D.5  \n1. St. Lawrence University, Department of Geology  \n2. Smithsonian Institution National Museum of Natural History, Dept. of Anthropology  \n3. Museum of Natural and Cultural History, University of Oregon  \n4. Smithsonian Institution, Museum Conservation Institute  \n5. University of California Santa Cruz, Dept. of Ocean Science  \nThe Northern Channel Islands of California were occupied by the Chumash and their predecessors for ~13,000 years. Over the past ~1,500 years, during the Middle to Late Transition (MLT) period, major changes in sociopolitical structure and subsistence strategies are apparent in the archaeological record, coinciding with the Medieval Climate Anomaly. While some proponents contend that regional social systems were steadily evolving towards increased hierarchy and political stratification over millennia, others argue it was spurred rapidly by climate instability.  \nCoastal California is a highly productive upwelling system. However, marine climate oscillations (e.g., ENSO or PDO cycles) strongly agect nutrients, productivity, and ecosystem structure. While marine climate records are traditionally reconstructed from sediment cores, these records integrate over broad regions and timescales, and may not capture local changes. In contrast, isotope paleo proxies preserved in shell from archaeological middens can capture ocean biogeochemistry and upwelling dynamics of a precise location and time. Archaeological shell archives ","cbCaifJ6gGyODjKI","https://ap.wps.com/l/cbCaifJ6gGyODjKI","pdf",1022531,155,"English","# Abstracts\n## 001 - North Sea food web dynamics\n## 002 - Northern Channel Islands productivity and dynamics\n## 003 - Grey wolf ecology diet variation","[{\"question\":\"文中如何利用稳定同位素研究北海食物网的长期变化？\",\"answer\":\"通过分析博物馆档案与荷兰搁浅动物网络组织库中港湾鼠海豚骨胶原及氨基酸的碳、氮同位素比值，推断现代与历史营养级，并识别基线氮与食物网结构的变化。\"},{\"question\":\"加利福尼亚北部海峡群岛的研究使用了哪些同位素指标与材料？\",\"answer\":\"测量考察时期贝壳内有机质（Mytilus californianus）中的δ13C与δ15N，并将其与中晚全新世转型期（及前后时期）的海洋生产力变化联系起来。\"},{\"question\":\"灰狼饮食研究如何体现“个体专业化”对同位素结果的影响？\",\"answer\":\"对不同个体灰狼犬齿牙本质胶原进行序列采样并测定δ13C与δ15N，同步评估多种具有不同觅食策略与栖息地的猎物同位素范围，从而比较个体间饮食变异。\"}]","ISOECOL2024 Abstract Book | PDF",391]