Sharing menus and kids' specials: Inter- and intraspecific differences in stable isotope niches between sympatrically breeding storm-petrels

Ausems, Anne N. M. A.; Skrzypek, Grzegorz; Wojczulanis‐Jakubas, Katarzyna; Jakubas, Dariusz

doi:10.1016/j.scitotenv.2020.138768

Cited by 8 publications

(9 citation statements)

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“…Individuals of S. plana inhabit intertidal muddy flats and filter only the water closest to the bottom, whereas those of M. galloprovincialis filter higher up in the water column. Filter-feeding hosts with generalist diets or superabundant suspended organic particles as preys could allow a high trophic overlap in the symbiotic system ( Ausems et al 2020 ). This may serve to reduce competition among species, although wild suspension-feeders do not necessarily compete for food, and the feeding mechanisms are of fundamental importance to understand the partitioning of food resources and dietary overlap of co-occurring species ( Dubois et al 2007c ).…”

Section: Discussionmentioning

confidence: 99%

“…We determined the size of the niche width of each group using Bayesian Standard Ellipse Areas (BSEAs, siberEllipses) and then used Bayesian Overlap to calculate the niche overlap area between the corresponding Bayesian Estimates for the 95% Prediction Ellipse Area (BEPEA). As we were interested in how much of each individual niche overlapped with the others, niche overlap was calculated as the proportion of overlapping BEPE relative to the BEPE of each group separately ( Ausems et al 2020 ).…”

Section: Methodsmentioning

confidence: 99%

“…Naturally, occurring stable isotopes of carbon (δ 13 C) and nitrogen (δ 15 N) reveal distinct aspects of a consumer’s long-term trophic niche by providing a time- and space-integrated representation of dietary carbon sources and relative TP ( Layman and Allgeier 2012 ). Recently, quantitative metrics and statistical frameworks have been developed to examine stable isotope variation among defined groups to understand trophic diversity and quantify niche space ( Jackson et al 2011 ; Layman et al 2012 ; Ausems et al 2020 ). These tools allow for a better characterization of the ecological role of generalist species and their potential effects on native species and their food webs ( Guzzo et al 2013 ).…”

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confidence: 99%

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Isotopic niche provides an insight into the ecology of a symbiont during its geographic expansion

et al. 2021

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The study of the recent colonisation of a symbiont and its interaction with host communities in new locations is an opportunity to understand how they interact. The use of isotopic ratios in trophic ecology can provide measurements of a species’ isotopic niche, as well as knowledge about how the isotopic niches between symbiont and host species overlap. Stable isotope measurements were used to assess the sources of carbon assimilated by the host species (the bivalves Mytilus galloprovincialis and Scrobicularia plana) and their associated symbiont pea crab Afropinnotheres monodi, which occurs within these bivalves’ mantle cavities. The mixing model estimates suggest that all of them assimilate carbon from similar sources, particularly from pseudofaeces and particulate organic matter in this symbiotic system based on filter feeding. The symbiotic species occupies comparable trophic levels and its association seems to be commensal or parasitic depending on the duration of such association. The pea crab A. monodi reflects a sex-specific diet, where males are more generalist than the soft females because the latter’s habitat is restricted to the host bivalve. The high isotopic overlap between soft females and M. galloprovincialis may reflect a good commensal relationship with the host.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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Isotopic niche provides an insight into the ecology of a symbiont during its geographic expansion

et al. 2021

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“…Indeed, surveys in 1984 and 2016 in Adélie Land, Antarctica showed a 40% decline in breeding pairs (Barbraud et al 2017). The declining trend in WSP is further suggested by the apparent lower occupancy rate of nests and thus number of chicks in recent years compared to earlier studies in the same locations on KGI (Jabłoński 1986;Wasilewski 1986;Kostelecka-Myrcha and Myrcha 1989;Gębczyński and Jadwiszczak 2000;Ausems et al 2020). Similar to other seabirds (Dias et al 2019), the possible causes for a population decline are likely manifold, mainly weather, climate and food availability related (Quillfeldt 2001(Quillfeldt , 2002Büßer et al 2004).…”

Section: Introductionmentioning

confidence: 87%

Where have all the petrels gone? Forty years (1978–2020) of Wilson’s Storm Petrel (Oceanites oceanicus) population dynamics at King George Island (Isla 25 de Mayo, Antarctica) in a changing climate

et al. 2023

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Numerous seabird species are experiencing population declines, and this trend is expected to continue or even accelerate in the future. To understand the effects of environmental change on seabird populations, long-term studies are vital, but rare. Here, we present over four decades (1978–2020) of population dynamic and reproductive performance data of Wilson’s Storm Petrels (Oceanites oceanicus) from King George Island (Isla 25 de Mayo), Antarctica. We determined temporal trends in population size, breeding output, and chick growth rates, and related interannual variation in these variables to various environmental variables. Our study revealed a decline of 90% in population size of Wilson’s Storm Petrels in two colonies, and considerable changes in breeding output and chick growth rates. Temporal changes in breeding demographics were linked to interannual environmental variation, either causing changes in food availability (particularly Antarctic krill, Euphausia superba) or in nest burrow accessibility due to snow blocking the entrance. With the expected rise in air and sea surface temperatures, the predicted increases in precipitation over the Antarctic Peninsula will likely lead to increased snowstorm prevalence. Additionally, the rising temperatures will likely reduce food availability due to reduced sea ice cover in the wintering grounds of Antarctic krill, or by changing phyto- and zooplankton community compositions. The ongoing environmental changes may thus lead to a further population decline, or at the very least will not allow the population to recover. Monitoring the population dynamics of Antarctic seabirds is vital to increase our understanding of climate change-induced changes in polar food webs.

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“…Understanding the ecology of herbivores is crucial for developing strategies that promote their sustainability [ 1 ]. As a fundamental aspect of ecological research, diet contributes to the substantial body size variation observed in herbivore populations [ 2 ] and provides valuable basic information for estimating environmental capacity [ 3 ], calculating energy metabolism [ 4 ], assessing habitat suitability [ 5 ], analyzing intra- and interspecific relationships [ 6 ], and formulating protection strategies [ 7 ]. Additionally, seasonal dietary changes play a significant role in the avoidance of seasonal resource bottlenecks by herbivores [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Seasonal Diet Composition of Goitered Gazelle (Gazella subgutturosa) in an Arid and Semi-Arid Region of Western China

Zhang,

Liu

et al. 2024

Animals

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Global climate change, habitat fragmentation, and human interference have resulted in a significant, ongoing decline in the population of goitered gazelles. Effective conservation strategies require an understanding of resource requirements of threatened species, such as dietary needs. Therefore, we aimed to elucidate the food composition and seasonal dietary changes of goitered gazelles through microhistological analyses of fresh feces. Fabaceae (11.5%), Gramineae (9.4%), Chenopodiaceae (20.2%), Asteraceae (10.1%), and Rosaceae (19.5%) formed the primary dietary components of goitered gazelle. Additionally, Krascheninnikovia arborescens (13.4%) and Prunus sibirica (16.3%) were identified as the key forage plants. Forbs (50.4%) were the predominant plants for grazing throughout the year, particularly in the spring (72.9%). The proportion of trees in the diet was highest in the autumn (36.7%) and comparatively lower in other seasons. Furthermore, the proportions of shrubs (22.0%) and graminoids (14.8%) both reached their peaks in the winter. Our findings indicate that goitered gazelles strategically forage seasonally to cope with resource bottlenecks, enhancing their adaptability to arid and semi-arid habitats. Our study provides essential ecological information for the conservation of goitered gazelles and emphasizes the importance of dietary studies of species of ecological significance in environmentally sensitive areas.

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Sharing menus and kids' specials: Inter- and intraspecific differences in stable isotope niches between sympatrically breeding storm-petrels

Cited by 8 publications

References 95 publications

Isotopic niche provides an insight into the ecology of a symbiont during its geographic expansion

Isotopic niche provides an insight into the ecology of a symbiont during its geographic expansion

Where have all the petrels gone? Forty years (1978–2020) of Wilson’s Storm Petrel (Oceanites oceanicus) population dynamics at King George Island (Isla 25 de Mayo, Antarctica) in a changing climate

Seasonal Diet Composition of Goitered Gazelle (Gazella subgutturosa) in an Arid and Semi-Arid Region of Western China

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