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Endangered black abalone (haliotis cracherodii) abundance and habitat availability in Southern California.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Endangered black abalone (haliotis cracherodii) abundance and habitat availability in Southern California./
作者:	Eckdahl, Kari A.
面頁冊數:	1 online resource (61 pages)
附註:	Source: Masters Abstracts International, Volume: 76-12.
Contained By:	Masters Abstracts International76-12.
標題:	Biology. -
電子資源:	click for full text (PQDT)
ISBN:	9781321753011

Endangered black abalone (haliotis cracherodii) abundance and habitat availability in Southern California.
Eckdahl, Kari A.

Endangered black abalone (haliotis cracherodii) abundance and habitat availability in Southern California. - 1 online resource (61 pages)

Source: Masters Abstracts International, Volume: 76-12.

Thesis (M.S.)--California State University, Fullerton, 2015.

Includes bibliographical references

The black abalone (Haliotis cracherodii) is an endangered species that was once abundant in the rocky intertidal zone of southern California until overfishing and Withering Syndrome drastically reduced populations. In recent years, surveys on the Channel Islands began documenting an increase in juvenile abundance. The current status of black abalones on the southern California mainland has remained unknown with individuals rarely seen south of Point Conception since 1993. I conducted rocky intertidal surveys for black abalones at mainland localities from Point Conception to San Diego to estimate current abundances and document population demographics of any black abalones present. I also conducted habitat assessments to estimate the quality and availability of potential black abalone habitat. Surveys were also conducted at Channel Island localities on Santa Rosa, Santa Cruz, and Anacapa Islands to compare black abalone demographics and habitat quality to the southern California mainland. Surveys at 19 mainland sites found 75 black abalones dispersed among 5 sites; a proportion were smaller individuals (< 40 mm) indicating some recruitment has occurred within the last few years. Densities are much lower at island (0.06-0.64/m2) and mainland (0-0.01/m 2) sites than the estimated minimum density (0.75-1.1/m2) required for successful recruitment to occur. Good and moderate habitat for black abalones is present on the mainland (0-35% and 0-60%, respectively) and islands (0-20% and10-62%). Sessile organisms reduce an average 6.8 ±0.63 percent of potential habitat from island sites and 8.6 ± 0.78 from mainland sites. This study provides current data on the status of Haliotis cracherodii in southern California and will help policy makers determine the best course of action for the recovery of this species.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9781321753011Subjects--Topical Terms:

599573
Biology.
Subjects--Index Terms:

AbaloneIndex Terms--Genre/Form:

554714
Electronic books.

Endangered black abalone (haliotis cracherodii) abundance and habitat availability in Southern California.
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520 $a The black abalone (Haliotis cracherodii) is an endangered species that was once abundant in the rocky intertidal zone of southern California until overfishing and Withering Syndrome drastically reduced populations. In recent years, surveys on the Channel Islands began documenting an increase in juvenile abundance. The current status of black abalones on the southern California mainland has remained unknown with individuals rarely seen south of Point Conception since 1993. I conducted rocky intertidal surveys for black abalones at mainland localities from Point Conception to San Diego to estimate current abundances and document population demographics of any black abalones present. I also conducted habitat assessments to estimate the quality and availability of potential black abalone habitat. Surveys were also conducted at Channel Island localities on Santa Rosa, Santa Cruz, and Anacapa Islands to compare black abalone demographics and habitat quality to the southern California mainland. Surveys at 19 mainland sites found 75 black abalones dispersed among 5 sites; a proportion were smaller individuals (< 40 mm) indicating some recruitment has occurred within the last few years. Densities are much lower at island (0.06-0.64/m2) and mainland (0-0.01/m 2) sites than the estimated minimum density (0.75-1.1/m2) required for successful recruitment to occur. Good and moderate habitat for black abalones is present on the mainland (0-35% and 0-60%, respectively) and islands (0-20% and10-62%). Sessile organisms reduce an average 6.8 ±0.63 percent of potential habitat from island sites and 8.6 ± 0.78 from mainland sites. This study provides current data on the status of Haliotis cracherodii in southern California and will help policy makers determine the best course of action for the recovery of this species.
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