Predation by introduced fish can magnify the terrestrial arthropod subsidies in mountain lakes

被引:4
|
作者
Rolla, Matteo [1 ,2 ]
Biffoni, Geordie [3 ]
Brighenti, Stefano [2 ,4 ,5 ]
Iacobuzio, Rocco [2 ,6 ]
Liautaud, Kevin [2 ]
Pasquaretta, Cristian [7 ]
Tiberti, Rocco [2 ,8 ]
机构
[1] Swansea Univ, Dept BioSci, Singleton Pk, Swansea SA2 8PP, W Glam, Wales
[2] Alpine Wildlife Res Ctr, Parco Nazl Gran Paradiso,Degioz 11, I-11010 Valsavarenche, Aosta, Italy
[3] Univ Genoa, Dipartimento Sci Terra Ambiente & Vita, DISTAV, I-16132 Genoa, Italy
[4] Univ Trento, Dipartimento Ingn Civile Ambientale & Meccan, Via Mesiano 77, I-38123 Trento, Italy
[5] IASMA Res & Innovat Ctr, Fdn E Mach, Sustainable Ecosyst & Bioresources Dept, Via E Mach 1, I-38010 San Michele All Adige, Trento, Italy
[6] Univ Milan, Dipartimento Biosci, DBS, Via Celoria 26, I-20133 Milan, Italy
[7] Univ Toulouse, CNRS, UPS, CRCA,CBI, Bat 4R3,118 Route Narbonne, F-31062 Toulouse 9, France
[8] Univ Pavia, DSTA, Via Ferrata 9, I-27100 Pavia, Italy
关键词
RECIPROCAL SUBSIDIES; ALLOCHTHONOUS SUBSIDY; NONNATIVE TROUT; FRESH-WATER; INSECTS; INVERTEBRATES; CONSUMPTION; PHOSPHORUS; TRANSPORT; NITROGEN;
D O I
10.1139/cjfas-2017-0121
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
A portion of the terrestrial subsidies to lentic habitats consists of arthropods. In high mountain, originally fishless lakes, terrestrial arthropods are an important seasonal food resource for introduced fish. Here we investigate how brook trout (Salvelinus fontinalis) can alter the input of terrestrial arthropods in 10 high mountain lakes contrasting for their stocking history (with and without fish or manipulated for fish eradication). We used a food consumption model to calculate the minimum and maximum number or biomass of arthropods consumed by fish, and we found that they can exceed, by several folds, the number or biomass of arthropods sinking into the lakes, at least under the metabolic rates expected for fish for most of the summer. We interpret this result as an indirect indication that arthropods usually cannot overcome the surface tension at the lake surface and that fish can work as a vector across the water-air interface. We infer that pathways for dead and live arthropods to leave the lakes do exist and fish can transfer into the water column many arthropods whose fate was leaving the lakes, which may have overlooked ecological and conservation implications.
引用
收藏
页码:1453 / 1464
页数:12
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