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Relative importance of predatory versus non-predatory mortality for dominant copepod species in the northern Chilean (23°S) Humboldt Current System

S Yáñez, P Hidalgo, Kam Tang Orcid Logo

Marine Ecology Progress Series, Volume: 630, Pages: 13 - 23

Swansea University Author: Kam Tang Orcid Logo

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DOI (Published version): 10.3354/meps13130

Abstract

Using detailed data of live/dead compositions, stage durations and molting rates, we derived for the first time both predatory and non-predatory mortality rates of the three main copepod species, Paracalanus cf. indicus, Acartia tonsa and Calanus chilensis, within the Humboldt Current System (HCS),...

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Published in: Marine Ecology Progress Series
ISSN: 0171-8630 1616-1599
Published: Inter-Research Science Center 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51664
first_indexed 2019-09-04T14:49:47Z
last_indexed 2019-09-19T20:17:26Z
id cronfa51664
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spelling 2019-09-19T14:58:39.9891046 v2 51664 2019-09-04 Relative importance of predatory versus non-predatory mortality for dominant copepod species in the northern Chilean (23°S) Humboldt Current System 69af43a3b9da24aef65c5d3a44956fe3 0000-0001-9427-9564 Kam Tang Kam Tang true false 2019-09-04 BGPS Using detailed data of live/dead compositions, stage durations and molting rates, we derived for the first time both predatory and non-predatory mortality rates of the three main copepod species, Paracalanus cf. indicus, Acartia tonsa and Calanus chilensis, within the Humboldt Current System (HCS), and examined their relations with environmental factors. Predatory mortality rates of all three species increased with developmental stages (hence body sizes), indicating top-down control by predators that prefer larger prey. Intrusion of oxygen-poor water via upwelling and low chlorophyll a concentration correlated with increased non-predatory mortality rates of P. cf. indicus and A. tonsa, whereas non-predatory mortality rate of C. chilensis increased with water temperature. Overall, non-predatory mortality accounted for 34.8 to 46.3 % of the total mortality among the three species. Changes in upwelling intensity due to climate change may alter the intensities of predatory and non-predatory mortalities in the HCS copepod communities. Journal Article Marine Ecology Progress Series 630 13 23 Inter-Research Science Center 0171-8630 1616-1599 Copepod mortality, Neutral red stain, Copepod carcasses, Vertical life table 7 11 2019 2019-11-07 10.3354/meps13130 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2019-09-19T14:58:39.9891046 2019-09-04T07:58:26.8140960 S Yáñez 1 P Hidalgo 2 Kam Tang 0000-0001-9427-9564 3 51664__15166__aad5a549909b44cdbeb2b71a4cbdbe45.pdf Tang_MEPS_authors_final.pdf 2019-09-04T07:59:52.8870000 Output 2830195 application/pdf Accepted Manuscript true 2020-11-07T00:00:00.0000000 true eng
title Relative importance of predatory versus non-predatory mortality for dominant copepod species in the northern Chilean (23°S) Humboldt Current System
spellingShingle Relative importance of predatory versus non-predatory mortality for dominant copepod species in the northern Chilean (23°S) Humboldt Current System
Kam Tang
title_short Relative importance of predatory versus non-predatory mortality for dominant copepod species in the northern Chilean (23°S) Humboldt Current System
title_full Relative importance of predatory versus non-predatory mortality for dominant copepod species in the northern Chilean (23°S) Humboldt Current System
title_fullStr Relative importance of predatory versus non-predatory mortality for dominant copepod species in the northern Chilean (23°S) Humboldt Current System
title_full_unstemmed Relative importance of predatory versus non-predatory mortality for dominant copepod species in the northern Chilean (23°S) Humboldt Current System
title_sort Relative importance of predatory versus non-predatory mortality for dominant copepod species in the northern Chilean (23°S) Humboldt Current System
author_id_str_mv 69af43a3b9da24aef65c5d3a44956fe3
author_id_fullname_str_mv 69af43a3b9da24aef65c5d3a44956fe3_***_Kam Tang
author Kam Tang
author2 S Yáñez
P Hidalgo
Kam Tang
format Journal article
container_title Marine Ecology Progress Series
container_volume 630
container_start_page 13
publishDate 2019
institution Swansea University
issn 0171-8630
1616-1599
doi_str_mv 10.3354/meps13130
publisher Inter-Research Science Center
document_store_str 1
active_str 0
description Using detailed data of live/dead compositions, stage durations and molting rates, we derived for the first time both predatory and non-predatory mortality rates of the three main copepod species, Paracalanus cf. indicus, Acartia tonsa and Calanus chilensis, within the Humboldt Current System (HCS), and examined their relations with environmental factors. Predatory mortality rates of all three species increased with developmental stages (hence body sizes), indicating top-down control by predators that prefer larger prey. Intrusion of oxygen-poor water via upwelling and low chlorophyll a concentration correlated with increased non-predatory mortality rates of P. cf. indicus and A. tonsa, whereas non-predatory mortality rate of C. chilensis increased with water temperature. Overall, non-predatory mortality accounted for 34.8 to 46.3 % of the total mortality among the three species. Changes in upwelling intensity due to climate change may alter the intensities of predatory and non-predatory mortalities in the HCS copepod communities.
published_date 2019-11-07T07:47:44Z
_version_ 1821390839887167488
score 11.212735

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