東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Lagged Recruitment, Indirect Interac...

Aalto, Emilius August.

Linked to FindBook

Google Book

Amazon

博客來

Lagged Recruitment, Indirect Interactions, and Delayed Recovery in Multi-Species Fisheries.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Lagged Recruitment, Indirect Interactions, and Delayed Recovery in Multi-Species Fisheries./
Author:	Aalto, Emilius August.
Description:	123 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
Contained By:	Dissertation Abstracts International75-01B(E).
Subject:	Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3596841
ISBN:	9781303441998

Lagged Recruitment, Indirect Interactions, and Delayed Recovery in Multi-Species Fisheries.
Aalto, Emilius August.

Lagged Recruitment, Indirect Interactions, and Delayed Recovery in Multi-Species Fisheries. - 123 p.

Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.

Thesis (Ph.D.)--University of California, Davis, 2013.

This item must not be sold to any third party vendors.

Ecosystem-based fisheries management must consider many elements of a complex marine community and, to accurately model the abundance of a particular target species, it is necessary to determine the most important out of many possible ecological dynamics. Here we consider three potential drivers: temporal heterogeneity, non-target effects, and species interactions. Firstly, we investigated how the assumption of equal recruitment and mortality timing, common to many fishery production models, affects stock estimates for data-poor species. Adjusting models to include no mortality delay and a recruitment time lag equal to age-at-maturity eliminated a 14-40% over-estimation of overfishing limits. Estimation error increases with age-at-maturity and natural mortality rate, indicating that time lag separation is most important for long-lived species. Secondly, we analyzed the balance within a multi-species fishery between non-target bycatch and positive indirect interactions between species. If the species involved interact strongly, the release from competition or predation can counteract or exceed the negative effects of bycatch. In particular, in communities where a shared predator forms a strong link between the target and non-target species, the positive effects of release from apparent competition can be larger than those of direct competitive release. Finally, we explored how the presence of an obligate predator affects recovery trajectories in the post-harvest period of a target species with a truncated size distribution. Compared to generalist predation, obligate predation delays the recovery of large prey individuals to pre-harvest abundance, even for sizes not targeted by the predator. In addition, the obligate predator lowered the relative abundance of smaller vulnerable individuals, delayed the shift to pre-harvest size distribution, and complicated post-harvest monitoring through population cycling. We conclude that the use of appropriate life-history time scales and the inclusion of strong species interactions are both important aspects of fisheries management, and their omission can cause over-estimation of initial stock size, damage from bycatch, and species recovery potential.

ISBN: 9781303441998Subjects--Topical Terms:

516476
Ecology.

Lagged Recruitment, Indirect Interactions, and Delayed Recovery in Multi-Species Fisheries.
LDR:03395nmm a2200313 4500 001 2061532
005 20151006081824.5
008 170521s2013 ||||||||||||||||| ||eng d
020 $a 9781303441998
035 $a (MiAaPQ)AAI3596841
035 $a AAI3596841
040 $a MiAaPQ $c MiAaPQ
100 1 $a Aalto, Emilius August. $3 3175809
245 1 0 $a Lagged Recruitment, Indirect Interactions, and Delayed Recovery in Multi-Species Fisheries.
300 $a 123 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
500 $a Adviser: Marcel Holyoak.
502 $a Thesis (Ph.D.)--University of California, Davis, 2013.
506 $a This item must not be sold to any third party vendors.
520 $a Ecosystem-based fisheries management must consider many elements of a complex marine community and, to accurately model the abundance of a particular target species, it is necessary to determine the most important out of many possible ecological dynamics. Here we consider three potential drivers: temporal heterogeneity, non-target effects, and species interactions. Firstly, we investigated how the assumption of equal recruitment and mortality timing, common to many fishery production models, affects stock estimates for data-poor species. Adjusting models to include no mortality delay and a recruitment time lag equal to age-at-maturity eliminated a 14-40% over-estimation of overfishing limits. Estimation error increases with age-at-maturity and natural mortality rate, indicating that time lag separation is most important for long-lived species. Secondly, we analyzed the balance within a multi-species fishery between non-target bycatch and positive indirect interactions between species. If the species involved interact strongly, the release from competition or predation can counteract or exceed the negative effects of bycatch. In particular, in communities where a shared predator forms a strong link between the target and non-target species, the positive effects of release from apparent competition can be larger than those of direct competitive release. Finally, we explored how the presence of an obligate predator affects recovery trajectories in the post-harvest period of a target species with a truncated size distribution. Compared to generalist predation, obligate predation delays the recovery of large prey individuals to pre-harvest abundance, even for sizes not targeted by the predator. In addition, the obligate predator lowered the relative abundance of smaller vulnerable individuals, delayed the shift to pre-harvest size distribution, and complicated post-harvest monitoring through population cycling. We conclude that the use of appropriate life-history time scales and the inclusion of strong species interactions are both important aspects of fisheries management, and their omission can cause over-estimation of initial stock size, damage from bycatch, and species recovery potential.
520 $a Keywords Fisheries management; time lags; delayed recruitment; mortality; density dependence; stock assessment; Depletion-Based Stock Reduction Analysis..
590 $a School code: 0029.
650 4 $a Ecology. $3 516476
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Environmental science. $3 677245
690 $a 0329
690 $a 0792
690 $a 0768
710 2 $a University of California, Davis. $b Ecology. $3 1678659
773 0 $t Dissertation Abstracts International $g 75-01B(E).
790 $a 0029
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3596841