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Reciprocal subsidies between freshwater and terrestrial ecosystems structure consumer-resource dynamics
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
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2012 (Engelska)Ingår i: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 93, nr 5, s. 1173-1182Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Cross-ecosystem movements of material and energy, particularly reciprocal resource fluxes across the freshwater-land interface, have received major attention. Freshwater ecosystems may receive higher amounts of subsidies (i.e., resources produced outside the focal ecosystem) than terrestrial ecosystems, potentially leading to increased secondary production in freshwaters. Here we used a meta-analytic approach to quantify the magnitude and direction of subsidy inputs across the freshwater-land interface and to determine subsequent responses in recipient animals. Terrestrial and freshwater ecosystems differed in the magnitude of subsidies they received, with aquatic ecosystems generally receiving higher subsidies than terrestrial ecosystems. Surprisingly, and despite the large discrepancy in magnitude, the contribution of these subsidies to animal carbon inferred from stable isotope composition did not differ between freshwater and terrestrial ecosystems, likely due to the differences in subsidy quality. The contribution of allochthonous subsidies was highest to primary consumers and predators, suggesting that bottom-up and top-down effects may be affected considerably by the input of allochthonous resources. Future work on subsidies will profit from a food web dynamic approach including indirect trophic interactions and propagating effects.

Ort, förlag, år, upplaga, sidor
2012. Vol. 93, nr 5, s. 1173-1182
Nationell ämneskategori
Ekologi
Identifikatorer
URN: urn:nbn:se:uu:diva-160772DOI: 10.1890/11-1210.1ISI: 000304368100022OAI: oai:DiVA.org:uu-160772DiVA, id: diva2:452835
Tillgänglig från: 2011-10-31 Skapad: 2011-10-31 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Ingår i avhandling
1. Ecology across Boundaries: Food web coupling among and within ecosystems
Öppna denna publikation i ny flik eller fönster >>Ecology across Boundaries: Food web coupling among and within ecosystems
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Cross-boundary movements of energy and material are ubiquitous. Freshwater ecosystems receive nutrients, dissolved, and particulate organic matter from adjacent terrestrial ecosystems, whereas terrestrial ecosystems mainly receive prey organisms and detritus deposited by physical processes such as floods from freshwater ecosystems. Within lakes, fish are considered as integrators between habitats due to their high mobility, although they often occupy either near-shore littoral or open-water pelagic habitats and develop habitat-specific morphologies. Such intra-population divergence in morphological traits might limit the use of multiple habitats.

In this thesis, I first focused on quantity and quality of reciprocal fluxes of particulate organic matter between freshwater and terrestrial ecosystems and responses of recipient consumers. Freshwater ecosystems generally received higher amounts of externally-produced resources than terrestrial ecosystems. Despite this discrepancy, aquatic and terrestrial consumer responses were similar, likely due to the differences in resource quality. Second, I investigated the potential of particulate organic carbon (POC) supporting benthic food webs in lakes; a pathway that has largely been neglected in previous studies. I found that POC can substantially subsidize the benthic food web and that the effects on the benthic food web were transferred to the pelagic habitat, thus emphasizing the importance of benthic pathways for pelagic production. Third, I examined how water transparency can affect intra-population divergence in perch (Perca fluviatilis). I observed that increased water transparency can considerably increase morphological divergence between littoral and pelagic populations likely due to its effects on foraging. Finally, I investigated the effects of such intra-population divergence on littoral-pelagic food web coupling. I found that low morphological divergence corresponded with high overlap in resource use, whereas strong morphological divergence resulted in low overlap in resource use. Here littoral populations mainly utilized littoral resources and pelagic populations primarily utilized pelagic resources, indicating that habitat coupling might be strongly limited when intra-population divergence is high.

In conclusion, although different ecosystems seem separated by distinct physical boundaries, these boundaries are often crossed. However, the development of habitat-specific adaptive traits might limit movement between apparently contiguous habitats.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2011. s. 48
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 881
Nyckelord
cross-ecosystem, food web, habitat coupling, terrestrial-aquatic linkages, subsidy, allochthonous, lake ecosystem, population divergence, trait variation
Nationell ämneskategori
Biologiska vetenskaper Ekologi
Forskningsämne
Biologi med inriktning mot limnologi
Identifikatorer
urn:nbn:se:uu:diva-160783 (URN)978-91-554-8222-0 (ISBN)
Disputation
2011-12-16, Friessalen, Evolutionary Biology Centre (EBC), Norbyvägen 18, Uppsala, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2011-11-24 Skapad: 2011-10-31 Senast uppdaterad: 2012-01-03

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