Decoupled reciprocal subsidies of biomass and fatty acids in fluxes of invertebrates between a temperate river and the adjacent land

Moyo, Sydney; Chari, Lenin D.; Villet, Martin H.; Richoux, Nicole B.

doi:10.1007/s00027-017-0529-0

Cited by 23 publications

(38 citation statements)

References 62 publications

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“…Aquatic insect fatty acid and stable isotope data and primary producer stable isotope data were extracted from Moyo (), Moyo et al . (), and Dalu et al . (), all concurrently run studies in the Kowie River.…”

Section: Methodsmentioning

confidence: 87%

“…The following odonate species were present at the sites: Anax speratus ( A s), Crocothermis erythraea ( C e), Ceratogomphus pictus ( C p), Ischnura senegalensis ( I s), Metacnemis valida ( M v), Nesciothemis farinosa ( N f), Orthetrum julia ( O j), Orthetrum trinacria ( O t), Paragomphus cognatus ( P c), Pseudagrion draconis ( P d), Pseudagrion hageni ( P h), Pantala flavescens ( P f), Pseudagrion kersteni ( P k), Pseudagrion massaicum ( P m), Pseudagrion spernatum ( P s), Trithemis arteriosa ( T a), Tramea basilaris ( T b), and Trithemis dorsalis ( T d). Data for basal resources and aquatic insects were obtained from Dalu et al (), Moyo (), Moyo et al () and (S. Moyo, unpublished data). All food sources and basal resources were pooled into their respective groups (aquatic producers, aquatic insects, terrestrial C 3/ C 4 plants and terrestrial insects).…”

Section: Resultsmentioning

confidence: 99%

“…; Table ). The higher insect productivity rate at the downstream site (1402 ± 152 mg m −2 day −1 ) compared with the upstream site (169 ± 13 mg m −2 day −1 ; Moyo, ; Moyo et al ., ) was probably the main source of the different odonate diets between sites. Odonates inhabiting high insect productivity areas (downstream) had greater access to aquatic sources than did those at the low productivity areas.…”

Section: Discussionmentioning

confidence: 99%

“…Data were ordinated by TFA composition and each symbol represents an insect taxonomic group (order). Aquatic insect data were obtained from concurrent studies in the K owie R iver (Moyo, ; Moyo et al , ). [Colour figure can be viewed at wileyonlinelibrary.com].…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Trophic ecology of adult male Odonata. II. Dietary contributions of aquatic food sources

Chari

Moyo

Richoux

2017

Ecological Entomology

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Abstract. 1. Insects that emerge from rivers provide nutritional subsidies to local riparian predators. Adult damselflies and dragonflies often benefit from aquatic resources, but their high mobility and evasiveness have made it difficult to monitor their diets.2. A dual fatty acid and stable isotope analysis approach was used to investigate the links between Odonata size and behaviour with proportions of their aquatically derived nutritional sources. Additionally, the study investigated the variation in dietary contributions of aquatic food sources to Odonata between two sections of a river, each with different aquatic productivity rates.3. Variations in body size and foraging method of Odonata in the Kowie River (South Africa) contributed to differences in the contributions of aquatic food sources to their diets. Large Odonata that consumed prey in flight had smaller proportions of aquatic indicator fatty acids and stable isotope-generated proportions of aquatic food sources than did the smaller Odonata that consumed prey from perches.4. There was a considerable amount of interspecific variation in indicators of aquatic feeding, but Odonata at an upstream site had smaller proportions of aquatic indicators than those at a downstream site which had higher insect emergence rates.5. The findings of this study contribute information on the dynamics of feeding ecology among adult Odonata, and the substantial contributions of aquatic prey (>80% of total diet in some cases) indicated that cross-boundary trophic linkages via odonates are strong in the Kowie River.

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Section: Methodsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Trophic ecology of adult male Odonata. II. Dietary contributions of aquatic food sources

Chari

Moyo

Richoux

2017

Ecological Entomology

Self Cite

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“…The stable isotope and fatty acid niche widths produced from models that included all odonates at each site, regardless of taxon, feeding guild, or body size, were larger at the downstream than at the upstream site (Table ), suggesting that there was greater prey variation available downstream. In support of this idea, a concurrent study in the Kowie River reported higher aquatic insect emergence and diversity at the downstream than at the upstream section (Moyo, ; Moyo et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Trophic ecology of adult male Odonata. I. Dietary niche metrics by foraging guild, species, body size, and location

Chari

Moyo

Richoux

2017

Ecological Entomology

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Abstract. 1. Information on the dietary niches of adult odonates is sparse, as they are highly mobile and evasive animals, which makes them difficult to observe in their natural habitat. Moreover, there is a lack of knowledge on how varying behavioural traits of odonates relate to phenomena like niche partitioning.2. This study investigated niche partitioning amongst odonate species, foraging guilds and size classes in a riverine system in the Eastern Cape province of South Africa. A combination of stable isotope and fatty acid-based niches was used to infer odonate feeding.3. Both fatty acid and stable isotope-based niches showed that there was niche separation amongst odonates that forage in flight (fliers) and those that forage from a perch (perchers), amongst odonates of different size classes (damselflies, medium-and large-sized dragonflies), and amongst species, although varying levels of niche overlap were observed in each case.4. Niche sizes of odonates varied between an upstream and a downstream site. Generally greater niche overlap was recorded at the narrow upstream site (associated with low insect emergence rates) than the wider downstream site (associated with high insect emergence rates), indicating that a greater degree of resource sharing occurred at the upstream site where aquatic food was less abundant.5. The findings of this study suggest that dietary niches of odonates can be influenced by foraging guild, body size, and/or environmental conditions, and additional study in a variety of regions is recommended to determine the greater applicability of these findings.

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Trophic transfer of polyunsaturated fatty acids across the aquatic–terrestrial interface: An experimental tritrophic food chain approach

Ohler

Schreiner

Martin‐Creuzburg

et al. 2023

Ecology and Evolution

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Aquatic and their adjacent terrestrial ecosystems are linked via the flux of organic and inorganic matter. Emergent aquatic insects are recognized as high-quality food for terrestrial predators, because they provide more physiologically relevant long-chain polyunsaturated fatty acids (PUFA) than terrestrial insects. The effects of dietary PUFA on terrestrial predators have been explored mainly in feeding trials conducted under controlled laboratory conditions, hampering the assessment of the ecological relevance of dietary PUFA deficiencies under field conditions. We assessed the PUFA transfer across the aquatic-terrestrial interface and the consequences for terrestrial riparian predators in two outdoor microcosm experiments. We established simplified tritrophic food chains, consisting of one of four basic food sources, an intermediary collector gatherer (Chironomus riparius, Chironomidae), and a riparian web-building spider (Tetragnatha sp.). The four basic food sources (algae, conditioned leaves, oatmeal, and fish food) differed in PUFA profiles and were used to track the trophic transfer of single PUFA along the food chain and to assess their potential effects on spiders, that is, on fresh weight, body condition (size-controlled measurement of nutritional status), and immune response. The PUFA profiles of the basic food sources, C. riparius and spiders differed between treatments, except for spiders in the second experiment. The PUFA α-linolenic acid (ALA, 18:3n-3) and ɣ-linolenic acid (GLA, 18:3n-6) were major contributors to the differences between treatments. PUFA profiles of the basic food sources influenced the fresh weight and body condition of spiders in the first experiment, but not in the second experiment, and did not affect the immune response, growth rate, and dry weight in both experiments. Furthermore, our results indicate that the examined responses are dependent on temperature. Future studies including anthropogenic stressors would deepen our understanding of the transfer and role of PUFA in ecosystems.

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Decoupled reciprocal subsidies of biomass and fatty acids in fluxes of invertebrates between a temperate river and the adjacent land

Cited by 23 publications

References 62 publications

Trophic ecology of adult male Odonata. II. Dietary contributions of aquatic food sources

Trophic ecology of adult male Odonata. II. Dietary contributions of aquatic food sources

Trophic ecology of adult male Odonata. I. Dietary niche metrics by foraging guild, species, body size, and location

Trophic transfer of polyunsaturated fatty acids across the aquatic–terrestrial interface: An experimental tritrophic food chain approach

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