Article
Ecology
Philip J. Manlick, Seth D. Newsome
Summary: Animals consume resources through multiple energy channels, connecting food webs and driving trophic structure. Stable isotope 'fingerprints' can trace energy flow in wild systems. This study shows that ΔC-13 fingerprints accurately measure energy flow to vertebrate consumers and can estimate multichannel feeding at various temporal scales.
METHODS IN ECOLOGY AND EVOLUTION
(2022)
Article
Engineering, Environmental
Dokyun Kim, Eun-Ji Won, Ha-Eun Cho, Jonghyun Lee, Kyung-Hoon Shin
Summary: Although many attempts have been made to improve the accuracy of trophic magnification factor (TMF) and biomagnification factor (BMF) for assessing pollutant bioaccumulation, this study suggests an improved BMF (BMF') for mercury bioaccumulation in freshwater fish. The results show that the values of BMF' are generally higher than TMF, indicating that it is a more reliable index for risk assessment. This ecological approach provides novel insights into the behavior and trophic transfer of pollutants like mercury.
Article
Environmental Sciences
Wenzhe Xu, Yongxin Dang, Siu Gin Cheung, Zhinan Zhang, Jun Sun, Ankang Teng, Paul K. S. Shin
Summary: The addition of stable isotope tracers can enhance isotopic differences of primary producers, allowing for a wider food-web resolution than using natural abundance stable isotopes alone. In a study near Halophila minor seagrass bed in Hong Kong, China, a N-15 addition experiment revealed larger dietary contributions of benthic microalgae for some infauna species compared to natural abundance stable isotopes data. This suggests the importance of combining NASIs with isotope tracer addition for a more accurate determination of dietary contributions and trophic statuses in ecosystems with similar primary producer isotope values.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Biology
Thomas Larsen, Ricardo Fernandes, Yiming Wang, Patrick Roberts
Summary: Stable isotope analysis is widely used in archaeology and paleoanthropology to reconstruct diets, ecologies, and environments of past human populations. Researchers are now focusing on stable isotope ratios of individual amino acids to gain more detailed insights into trophic levels and resource use. This article provides a guide on using amino acid stable isotope ratios to determine dietary behaviors and ecologies of hominins. It highlights uncertainties in interpretation and methodological developments required for good practice, aiming to make this approach accessible to researchers from various backgrounds.
Article
Environmental Sciences
Tristan A. Guillemin, Julian G. Pepperell, Troy Gaston, Jane E. Williamson
Summary: This study used stable isotope analysis to assess the trophic ecology of three species of marlin in temperate eastern Australian waters, revealing differences in diet among the species and highlighting the unique characteristics of blue marlin's dietary influences.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Biodiversity Conservation
Zhixin Ke, Ruofei Li, Danting Chen, Yehui Tan
Summary: The trophic structure of the zooplankton community in Daya Bay reflects the health of the ecosystem and the impact of human activities. This study investigated the stable isotope values (813C and 815N) and trophic positions of dominant zooplankton groups in Daya Bay during winter. The results showed that the distribution of isotopic values was influenced by terrestrial organic matter input and nutrient loading. Eutrophication increased trophic overlap between zooplankton groups, and large Sagitta was identified as the top predator in the community.
ECOLOGICAL INDICATORS
(2022)
Article
Environmental Sciences
Zhixin Ke, Ruofei Li, Danting Chen, Chunyu Zhao, Yehui Tan
Summary: This study investigated the spatial and seasonal distributions of stable carbon and nitrogen isotopes in dominant zooplankton groups in Jiaozhou Bay. The results showed that the distributions of these isotopes were influenced by terrigenous organic matter input and phytoplankton biomass, with variations observed in different seasons. The study also found a correlation between small zooplankton stable isotope values and particulate organic matter. The influence of anthropogenic nutrient input on isotopic baseline and trophic levels of zooplankton groups was discussed.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Marine & Freshwater Biology
Yeon Jee Suh, Min-Seob Kim, Won-Kyung Lee, Hyunjin Yoon, Inkyeong Moon, Jaewoo Jung, Se-Jong Ju
Summary: This study investigated energy sources and trophic interactions among vent fauna in deep-sea hydrothermal vents in the North Fiji Basin. The findings indicate that symbiont-bearing taxa have different carbon fixation pathways or nutrient preferences. Niche partitioning was observed among omnivores, with different resources or microhabitats being utilized. The crab was found to be the top predator in the ecosystem, consuming a variety of prey but with a lower preference for mussels. Overall, the vent fauna displayed non-overlapping diets and spatial niches, with each taxon having unique energy sources.
Article
Environmental Sciences
Jing Wang, Ri-Jin Jiang, Yi Xiao, Rui Yin, Feng Chen, Yong-dong Zhou, Han-Xiang Xu
Summary: This study investigates the ecological niche differences and resource sharing among five Sciaenid fish species in the waters of the Zhoushan Archipelago. The results show significant differences in carbon and nitrogen isotopic values in the muscle tissues of these fish species. Zooplankton is a key food resource for all species, and some species also feed on benthos organisms. Differences in trophic niche width and overlap are observed among the species.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Tatiparthi Srinivas, Soniya Sukumaran, K. Ramesh Babu
Summary: Stable isotopic methods are used to study food webs and quantify carbon sources in animal diets. This study focused on four abundant amphipod species in the Vashishti estuary and found that seasonal variations significantly affected isotopic values of organic matter, but not of individual amphipod species. The differences in isotopic values between amphipod species indicated species-specific diets, and the mixing model showed discrepancies in seasonal food preferences. The trophic level values of all amphipod species varied seasonally, with lower values after the monsoon, possibly due to anthropogenic nitrogen input.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Zoology
Wanxin Lei, Wei Wei, Dan Pu, Shibu Qubi, Hong Zhou, Mingsheng Hong, Junfeng Tang, Han Han
Summary: By measuring the isotopes in the hair of giant pandas, researchers found that the trophic niche widths of the Qinling population were significantly larger than those of the Sichuan population, and both populations occupied a unique trophic position in the ecosystem. The difference in isotopes between bamboo shoots and other food parts, as well as the pandas' feeding choices, accounted for the discrepancy. This study provides new insights into the resource use and trophic ecology of giant pandas.
INTEGRATIVE ZOOLOGY
(2023)
Article
Marine & Freshwater Biology
Supanut Pairohakul, Peter J. W. Olive, Matthew G. Bentley, Gary S. Caldwell
Summary: The research indicates that polychaete worms may have the ability to synthesize PUFA rather than solely relying on accumulation through the food web. Specifically, the study observed changes in lipid composition in Alitta virens worms under a diet enriched with C16:0 palmitic acid, revealing a process of lipid elongation and desaturation.
Article
Marine & Freshwater Biology
Shike Gao, Siming Gong, Ze Chen, Xiao Zhang, Shuo Zhang, Wenwen Yu
Summary: The trophic structure of the Lvsi Fishing Ground ecosystem in the East China Sea was analyzed using two methods: mass-balance modeling and stable isotope analysis. Shrimps and trawling fisheries were found to have significant trophic impacts on most functional groups in the ecosystem. The study suggests that combining these two complementary methods can help validate trophic levels when balancing ecosystem structures.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Review
Engineering, Environmental
Noshan Bhattarai, Shuxiao Wang, Yuepeng Pan, Qingcheng Xu, Yanlin Zhang, Yunhua Chang, Yunting Fang
Summary: This review explores analytical techniques for measuring δN-15(NH3) and δN-15(NH4+), sampling methods for atmospheric NH3 and NH4+, and source apportionment of NH3 based on isotopes in urban areas. Challenges include collecting representative samples of emission sources and understanding isotopic fractionation during gas-to-particle conversion under different environmental conditions. Further experimental and theoretical work is needed to improve isotope-based source apportionment of NH3.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2021)
Article
Environmental Sciences
Lijun Cui, Zhijian Jiang, Xiaoping Huang, Songlin Liu, Yunchao Wu
Summary: This study used multiple isotopes and fatty acid markers to analyze the food sources and macrobenthos in a tropical seagrass bed in different seasons. The results showed that the combination of multiple isotopes and fatty acid markers can effectively distinguish complex food sources. Different markers are more suitable for different consumer species, and their combination is essential in identifying the diets of macrobenthos.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Philip J. Manlick, Mark C. Romanski, Jonathan N. Pauli
SCIENTIFIC REPORTS
(2018)
Article
Ecology
Philip J. Manlick, Shelby M. Petersen, Katie M. Moriarty, Jonathan N. Pauli
FUNCTIONAL ECOLOGY
(2019)
Article
Evolutionary Biology
Aleana R. Savage, Philip J. Manlick, Mark C. Romanski, Jonathan N. Pauli
BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
(2019)
Article
Ecology
Philip J. Manlick, Steve K. Windels, James E. Woodford, Jonathan N. Pauli
Article
Multidisciplinary Sciences
Philip J. Manlick, Jonathan N. Pauli
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Biodiversity Conservation
Kristina L. Black, Philip J. Manlick, Jonathan N. Pauli, Mark C. Romanski
Summary: Isle Royale National Park is considered a pristine ecosystem, but the origin of red foxes on the island remains uncertain, with a hypothesis that they may be a mix of natural colonization and human introduction.
AMERICAN MIDLAND NATURALIST
(2021)
Review
Ecology
Philip J. Manlick, Seth D. Newsome
Summary: Biotic homogenization, caused by human disturbance, replaces diverse specialist communities with generalist species, impacting ecological functions. Intraspecific variation and individual diet specialization are key drivers of ecological functions. Intraspecific competition leads to resource niche expansion and increased prevalence of individual diet specialization.
FRONTIERS IN ECOLOGY AND THE ENVIRONMENT
(2021)
Article
Ecology
Philip J. Manlick, Karin Maldonado, Seth D. Newsome
Summary: Competition and resource availability influence individual foraging strategies among desert rodents, leading to trophic niche contractions and specialization, but high plant biomass can induce individuals to adopt generalist strategies. Despite specialized individuals showing no fitness advantage, generalists have nearly 4 times higher survival probabilities, indicating that dietary generalism is a fitness-maximizing strategy in stochastic environments.
JOURNAL OF ANIMAL ECOLOGY
(2021)
Article
Zoology
Casey C. Day, Jonathan H. Gilbert, Philip J. Manlick, Jennifer A. Grauer, Jonathan N. Pauli, Kim T. Scribner, Bronwyn W. Williams, Patrick A. Zollner
Summary: Species reintroductions are successful when established populations maintain both demographic stability and genetic diversity. This study focuses on the genetic diversity of reintroduced American martens in the Upper Midwestern United States. The results show a decline in genetic diversity over time and an increase in genetic structure among populations.
JOURNAL OF MAMMALOGY
(2022)
Review
Ecology
Jonathan N. Pauli, Philip J. Manlick, Jody M. Tucker, G. Bradley Smith, Paul G. Jensen, Jason T. Fisher
Summary: Competition plays a vital role in determining species distribution and interactions. Among carnivores, interspecific competition is particularly prominent. The study focuses on the coexistence of fishers and martens, who share similar habitats and prey but differ in body size. It is found that both species are dietary generalists but specialize in different aspects of habitat complexity. Despite high niche overlap, fine-scale habitat and prey partitioning enable their coexistence. However, climate change and habitat alteration pose a threat to their coexistence and may result in local extirpation of vulnerable martens.
Article
Ecology
Philip J. Manlick, Seth D. Newsome
Summary: Animals consume resources through multiple energy channels, connecting food webs and driving trophic structure. Stable isotope 'fingerprints' can trace energy flow in wild systems. This study shows that ΔC-13 fingerprints accurately measure energy flow to vertebrate consumers and can estimate multichannel feeding at various temporal scales.
METHODS IN ECOLOGY AND EVOLUTION
(2022)
Article
Ecology
Oliver N. Shipley, Philip J. Manlick, Alisa L. Newton, Philip Matich, Merry Camhi, Robert M. Cerrato, Michael G. Frisk, Gregory A. Henkes, Jake S. LaBelle, Janet A. Nye, Hans Walters, Seth D. Newsome, Jill A. Olin
Summary: The study revealed that juvenile sand tiger sharks exhibit varying reliance on different prey resource pools, with individuals relying more on pelagic forage showing higher blood plasma concentrations of certain lipids. This variation in resource use was found to impact the energetic condition of the sharks.
Article
Ecology
Alexi C. Besser, Philip J. Manlick, Christina M. Blevins, Cristina D. Takacs-Vesbach, Seth D. Newsome
Summary: Herbivores often lack sufficient protein, but this study found that gut microbes play a vital role in maintaining the protein balance of wild animals, providing essential amino acids for their hosts. Using isotope analysis, researchers discovered that herbivorous rodents obtain a significant portion (around 40%-50%) of their essential amino acids from gut microbes, while omnivores and insectivores primarily rely on plant-based energy sources but still receive about 20% of essential amino acids from their gut microbes. These findings demonstrate the importance of gut microbes in host protein metabolism in wild animals.
Article
Biodiversity Conservation
Jonathan N. Pauli, Philip J. Manlick, Prarthana S. Dharampal, Yuko Takizawa, Yoshito Chikaraishi, Laura J. Niccolai, Jennifer A. Grauer, Kristina L. Black, Mario Garces Restrepo, Paula L. Perrig, Evan C. Wilson, Marie E. Martin, Mauriel Rodriguez Curras, Tiffany A. Bougie, Kimberly L. Thompson, Matthew M. Smith, Shawn A. Steffan