Home About Browse Search
Svenska


Size, connectivity and edge effects of stream habitats explain spatio-temporal variation in brown trout (Salmo trutta) density

Tamario, Carl and Degerman, Erik and Polic, Daniela and Tibblin, Petter and Forsman, Anders (2021). Size, connectivity and edge effects of stream habitats explain spatio-temporal variation in brown trout (Salmo trutta) density. Proceedings of the Royal Society B: Biological Sciences. 288 , 20211255
[Research article]

[img] PDF
780kB

Abstract

Ecological theory postulates that the size and isolation of habitat patches impact the colonization/extinction dynamics that determine community species richness and population persistence. Given the key role of lotic habitats for life-history completion in rheophilic fish, evaluating how the distribution of swift-flowing habitats affects the abundance and dynamics of subpopulations is essential. Using extensive electrofishing data, we show that merging island biogeography with meta-population theory, where lotic habitats are considered as islands in a lentic matrix, can explain spatio-temporal variation in occurrence and density of brown trout (Salmo trutta). Subpopulations in larger and less isolated lotic habitat patches had higher average densities and smaller between-year density fluctuations. Larger lotic habitat patches also had a lower predicted risk of excessive zero-catches, indicative of lower extinction risk. Trout density further increased with distance from the edge of adjacent lentic habitats with predator (Esox lucius) presence, suggesting that edge- and matrix-related mortality contributes to the observed patterns. These results can inform the prioritization of sites for habitat restoration, dam removal and reintroduction by highlighting the role of suitable habitat size and connectivity in population abundance and stability for riverine fish populations.

Authors/Creators:Tamario, Carl and Degerman, Erik and Polic, Daniela and Tibblin, Petter and Forsman, Anders
Title:Size, connectivity and edge effects of stream habitats explain spatio-temporal variation in brown trout (Salmo trutta) density
Series Name/Journal:Proceedings of the Royal Society B: Biological Sciences
Year of publishing :2021
Volume:288
Article number:20211255
Number of Pages:9
Publisher:ROYAL SOC
ISSN:0962-8452
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:colonization-extinction dynamics, habitat fragmentation, population abundance fluctuations, predation, river connectivity
URN:NBN:urn:nbn:se:slu:epsilon-p-114250
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114250
Additional ID:
Type of IDID
DOI10.1098/rspb.2021.1255
Web of Science (WoS)000708826500001
ID Code:26021
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:04 Nov 2021 15:25
Metadata Last Modified:04 Nov 2021 15:31

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits