Patterns of diet overlap between populations of non-indigenous and native fishes in shallow ponds

TY - JOUR

T1 - Patterns of diet overlap between populations of non-indigenous and native fishes in shallow ponds

AU - Declerck, S.

AU - Louette, G.

AU - De Bie, T.

AU - De Meester, Luc

N1 - WOS:000180447800009 ISI Document Delivery No.: 636HD Times Cited: 52 Cited Reference Count: 38 Declerck, S Louette, G De Bie, T De Meester, L Declerck, Steven/E-4338-2010; De Meester, Luc/F-3832-2015 Declerck, Steven/0000-0001-6179-667X; De Meester, Luc/0000-0001-5433-6843 61 1 27 Academic press ltd elsevier science ltd London 23

PY - 2002

Y1 - 2002

N2 - No significant differences in the diet composition were detected for any of the populations of four non-indigenous fish species (brown bullhead Ameiurus nebulosus, pumpkinseed Lepomis gibbosus, topmouth gudgeon Pseudorasbora parva and eastern mudminnow Umbra pygmaea) and two native fish species (gudgeon Gobio gobio and roach Rutilus rutilus), between two small shallow ponds and between habitats within the ponds, during late summer. Based on diet composition, groups of size classes within species (' functional groups ') were distinguished. For most functional group combinations of exotic fishes, diet overlap values were low. Although chironomid larvae formed the most important food source, differential consumption of chironomid size classes allowed an important degree of niche differentiation between non-indigenous fishes. In contrast, high diet overlap was found between the functional groups of indigenous gudgeon and of several non-indigenous fishes, indicating a high potential for interspecific exploitative competition. The diet of roach consisted almost entirely of non-animal remains (detritus and plant material). The high proportion of such low-energy food in the diet of this species may be indicative for a competition induced niche shift to suboptimal food sources. (C) 2002 The Fisheries Society of the British Isles. Published by Elsevier Science Ltd. All rights reserved.

AB - No significant differences in the diet composition were detected for any of the populations of four non-indigenous fish species (brown bullhead Ameiurus nebulosus, pumpkinseed Lepomis gibbosus, topmouth gudgeon Pseudorasbora parva and eastern mudminnow Umbra pygmaea) and two native fish species (gudgeon Gobio gobio and roach Rutilus rutilus), between two small shallow ponds and between habitats within the ponds, during late summer. Based on diet composition, groups of size classes within species (' functional groups ') were distinguished. For most functional group combinations of exotic fishes, diet overlap values were low. Although chironomid larvae formed the most important food source, differential consumption of chironomid size classes allowed an important degree of niche differentiation between non-indigenous fishes. In contrast, high diet overlap was found between the functional groups of indigenous gudgeon and of several non-indigenous fishes, indicating a high potential for interspecific exploitative competition. The diet of roach consisted almost entirely of non-animal remains (detritus and plant material). The high proportion of such low-energy food in the diet of this species may be indicative for a competition induced niche shift to suboptimal food sources. (C) 2002 The Fisheries Society of the British Isles. Published by Elsevier Science Ltd. All rights reserved.

KW - native fishes exotic fishes diet overlap pumpkinseed sunfish interconnected ponds brown bullhead zooplankton macroinvertebrates introductions impacts shift mass food Fisheries Marine & Freshwater Biology

U2 - 10.1006/jfbi.2002.2133

DO - 10.1006/jfbi.2002.2133

M3 - Article

SN - 0022-1112

VL - 61

SP - 1182

EP - 1197

JO - Journal of Fish Biology

JF - Journal of Fish Biology

IS - 5

ER -