國立虎尾科技大學 |

Effects of Open Circuit Scuba Exhaust on Reef Fish Surveys in the Main Hawaiian Islands.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Effects of Open Circuit Scuba Exhaust on Reef Fish Surveys in the Main Hawaiian Islands./
Author:	Lopes, Keolohilani Harold, Jr.
Description:	1 online resource (37 pages)
Notes:	Source: Masters Abstracts International, Volume: 56-05.
Subject:	Conservation biology. -
Online resource:	click for full text (PQDT)
ISBN:	9780355058284

Effects of Open Circuit Scuba Exhaust on Reef Fish Surveys in the Main Hawaiian Islands.
Lopes, Keolohilani Harold, Jr.

Effects of Open Circuit Scuba Exhaust on Reef Fish Surveys in the Main Hawaiian Islands. - 1 online resource (37 pages)

Source: Masters Abstracts International, Volume: 56-05.

Thesis (M.S.)--University of Hawai'i at Hilo, 2017.

Includes bibliographical references

The predominant method to quantify reef fish populations is the Open Circuit SCUBA (OC) in-situ fish survey. However, there are many biases associated with these surveys including the expelled OC exhaust which can cause visual and audible disturbances. This study aims to evaluate the bias created by OC exhaust utilizing closed-circuit rebreather (CCR) surveys, along surveys were conducted in protected areas and fished areas. The three sites in the main Hawaiian Islands were Kealakekua Bay (KK), Old Kona Airport (OA), and Pupukea (PK) marine life conservation district. This study found that the total fish biomass and species richness from all sites pooled showed no significant differences between gear types. However, there was a significant interaction between the gear type and the protection status (Pr(>|t|) = 0.025), indicating that there are greater differences between OC and CCR in the fished areas than the protected areas. The difference between the gear types showed a greater magnitude of OC having a higher biomass in the fished areas opposed to the protected areas where that difference was smaller. When fished species (Table 4 -- a, b) were examined, significant differences between gear types were shown (Pr(>|t|) = 0.010). The OC surveys showed more fished biomass than the CCR surveys which could mean that the attraction to the exhaust within the protected areas were greater than the repulsion of the exhaust in the fished areas. Differences in the fished species biomass while having no difference in the all fish biomass supports the previous studies findings that fishing pressure is very influential on the magnitude of difference between the gear types. For researchers, estimating fishing pressure is of high importance in order to assess the level of bias associated with OC exhaust on surveys. These biases need to be accounted for in population estimations for protected areas and non-protected areas in order to get more accurate biological fish data.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355058284Subjects--Topical Terms:

579656
Conservation biology.
Index Terms--Genre/Form:

554714
Electronic books.

Effects of Open Circuit Scuba Exhaust on Reef Fish Surveys in the Main Hawaiian Islands.
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500 $a Source: Masters Abstracts International, Volume: 56-05.
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502 $a Thesis (M.S.)--University of Hawai'i at Hilo, 2017.
504 $a Includes bibliographical references
520 $a The predominant method to quantify reef fish populations is the Open Circuit SCUBA (OC) in-situ fish survey. However, there are many biases associated with these surveys including the expelled OC exhaust which can cause visual and audible disturbances. This study aims to evaluate the bias created by OC exhaust utilizing closed-circuit rebreather (CCR) surveys, along surveys were conducted in protected areas and fished areas. The three sites in the main Hawaiian Islands were Kealakekua Bay (KK), Old Kona Airport (OA), and Pupukea (PK) marine life conservation district. This study found that the total fish biomass and species richness from all sites pooled showed no significant differences between gear types. However, there was a significant interaction between the gear type and the protection status (Pr(>|t|) = 0.025), indicating that there are greater differences between OC and CCR in the fished areas than the protected areas. The difference between the gear types showed a greater magnitude of OC having a higher biomass in the fished areas opposed to the protected areas where that difference was smaller. When fished species (Table 4 -- a, b) were examined, significant differences between gear types were shown (Pr(>|t|) = 0.010). The OC surveys showed more fished biomass than the CCR surveys which could mean that the attraction to the exhaust within the protected areas were greater than the repulsion of the exhaust in the fished areas. Differences in the fished species biomass while having no difference in the all fish biomass supports the previous studies findings that fishing pressure is very influential on the magnitude of difference between the gear types. For researchers, estimating fishing pressure is of high importance in order to assess the level of bias associated with OC exhaust on surveys. These biases need to be accounted for in population estimations for protected areas and non-protected areas in order to get more accurate biological fish data.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
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650 4 $a Environmental science. $3 1179128
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