東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Surface Water Connectivity of Arctic...

Laske, Sarah M.

FindBook

Google Book

Amazon

博客來

Surface Water Connectivity of Arctic Lakes Drives Patterns of Fish Species Richness and Composition, and Food Web Structure.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Surface Water Connectivity of Arctic Lakes Drives Patterns of Fish Species Richness and Composition, and Food Web Structure./
作者:	Laske, Sarah M.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	183 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
Contained By:	Dissertation Abstracts International79-01B(E).
標題:	Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10605011
ISBN:	9780355170191

Surface Water Connectivity of Arctic Lakes Drives Patterns of Fish Species Richness and Composition, and Food Web Structure.
Laske, Sarah M.

Surface Water Connectivity of Arctic Lakes Drives Patterns of Fish Species Richness and Composition, and Food Web Structure. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 183 p.

Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.

Thesis (Ph.D.)--University of Alaska Fairbanks, 2017.

Hydrological processes regulate fish habitat, largely controlling availability and suitability of habitat for freshwater fishes. Seasonal fluctuations in surface water distribution and abundance on the Arctic Coastal Plain, Alaska, influence individual fish species occupancy in lentic habitats. On low-relief tundra, permafrost processes and climate are chiefly responsible for lake formation and surface water dynamics, such as the timing, duration, and availability of water that affects fish species distributions. However, it is unclear how these relationships scale up to influence fish community richness and composition, or food web structure. Further, each of these processes is also likely to change with rapid climate warming occurring in the Arctic. By observing patterns of fish species occupancy, we examined how fish species richness and composition in Arctic lakes varied with surface water connectivity at coarse and spatial fine scales. Through experiments and observation, we determined the structure of food webs as they related to surface water connectivity and foraging habits of associated fish species. We found surface water connectivity was a driver of fish species richness and assemblage patterns. Permanently connected lakes contained nearly twice as many species as disconnected lakes; and the most strongly connected lakes contained an average of four additional species compared to isolated lakes. Functional traits of fishes, like life history or body morphology, likely dictate their ability to colonize habitats. Given reduced colonization potential, isolated lakes either never supported or could not retain larger predatory fishes. In isolated systems only one fish predator occurred consistently, and this species showed strong top-down control of invertebrate prey in experimental systems. Yet, in natural environments single-predator systems have fewer trophic links than multi-predator systems, and therefore, less trophic redundancy across species. The loss of species due to isolation reduced the total number of trophic links and shortened food chains. However, I argue that the complexity and addition of top-predators in surface water connected lakes adds trophic redundancy, stabilizes energy flow, and potentially enhances persistence within in food webs and across the meta-community of food webs. Changes to fish species richness, composition, or food web structure from climate warming may be dampened by the resilience of food webs locally, but across the broader landscape it is likely that some food webs will be restructured due to changes in colonization potential regulated by surface water connectivity.

ISBN: 9780355170191Subjects--Topical Terms:

516476
Ecology.

Surface Water Connectivity of Arctic Lakes Drives Patterns of Fish Species Richness and Composition, and Food Web Structure.
LDR:03684nmm a2200301 4500 001 2200433
005 20190315110955.5
008 201008s2017 ||||||||||||||||| ||eng d
020 $a 9780355170191
035 $a (MiAaPQ)AAI10605011
035 $a (MiAaPQ)uaf:10669
035 $a AAI10605011
040 $a MiAaPQ $c MiAaPQ
100 1 $a Laske, Sarah M. $0 (orcid)0000-0002-6096-0420 $3 3427181
245 1 0 $a Surface Water Connectivity of Arctic Lakes Drives Patterns of Fish Species Richness and Composition, and Food Web Structure.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 183 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
500 $a Advisers: Amanda E. Rosenberger; Mark S. Wipfli.
502 $a Thesis (Ph.D.)--University of Alaska Fairbanks, 2017.
520 $a Hydrological processes regulate fish habitat, largely controlling availability and suitability of habitat for freshwater fishes. Seasonal fluctuations in surface water distribution and abundance on the Arctic Coastal Plain, Alaska, influence individual fish species occupancy in lentic habitats. On low-relief tundra, permafrost processes and climate are chiefly responsible for lake formation and surface water dynamics, such as the timing, duration, and availability of water that affects fish species distributions. However, it is unclear how these relationships scale up to influence fish community richness and composition, or food web structure. Further, each of these processes is also likely to change with rapid climate warming occurring in the Arctic. By observing patterns of fish species occupancy, we examined how fish species richness and composition in Arctic lakes varied with surface water connectivity at coarse and spatial fine scales. Through experiments and observation, we determined the structure of food webs as they related to surface water connectivity and foraging habits of associated fish species. We found surface water connectivity was a driver of fish species richness and assemblage patterns. Permanently connected lakes contained nearly twice as many species as disconnected lakes; and the most strongly connected lakes contained an average of four additional species compared to isolated lakes. Functional traits of fishes, like life history or body morphology, likely dictate their ability to colonize habitats. Given reduced colonization potential, isolated lakes either never supported or could not retain larger predatory fishes. In isolated systems only one fish predator occurred consistently, and this species showed strong top-down control of invertebrate prey in experimental systems. Yet, in natural environments single-predator systems have fewer trophic links than multi-predator systems, and therefore, less trophic redundancy across species. The loss of species due to isolation reduced the total number of trophic links and shortened food chains. However, I argue that the complexity and addition of top-predators in surface water connected lakes adds trophic redundancy, stabilizes energy flow, and potentially enhances persistence within in food webs and across the meta-community of food webs. Changes to fish species richness, composition, or food web structure from climate warming may be dampened by the resilience of food webs locally, but across the broader landscape it is likely that some food webs will be restructured due to changes in colonization potential regulated by surface water connectivity.
590 $a School code: 0006.
650 4 $a Ecology. $3 516476
650 4 $a Aquatic sciences. $3 3174300
690 $a 0329
690 $a 0792
710 2 $a University of Alaska Fairbanks. $b Fisheries. $3 3169766
773 0 $t Dissertation Abstracts International $g 79-01B(E).
790 $a 0006
791 $a Ph.D.
792 $a 2017
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10605011