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Welcome to the 22nd Annual California GIS Conference. CalGIS 2016 will take place May 10-12 at the Sheraton Park Hotel at the Anaheim Resort.

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Thursday, May 12 • 11:20am - 11:40am
GIS Applications Examining the Spatial Distribution of Damselfish Populations

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With increasing habitat degradation, ocean acidification and coral reef mortality, understanding the role of competition in partitioning spatial resources is a topic of growing interest in the ecological community. This study explores spatial movement in damselfish populations following its release from a competitively dominant species. In this study, we observe the spatial effect of the removal of Plectroglyphidodon lacrymatus on 4 inferior species: Pomacentrus bankanensis , Pomacentrus adelus, Neoglyphidodon nigroris, and Chrysiptera unimaculata surveyed  at various long and short term periods before and after the removal. A 22m x 20m study area in Kimbe Bay, Papua New Guinea, this project is the finest scale removal study of its kind and requires an innovative use of Geographic Information Science.

Nearest neighbor analysis is used to quantify the degree of closeness of each species before and after the release from the dominant species. Contrasts of mean c enter and directional distribution is used to track the movement of each species throughout the reef study area over time in relation to the removal of the dominantly competitive species. From these methods, it is found that there is a change in the degree of closeness and mean location of each species immediately following the removal of the dominant competitor, followed by return to the original state prior to P. lacramatus removal in the long term. P. adelus, the most abundant species on the reef, however, does not return to its original state in the long term. This finding serves as a gateway for further spatial and ecological studies.

Presenter: Ahna Miller, Grad Student, Clark University, Worcester, MA

avatar for Bruce Joffe, GISP

Bruce Joffe, GISP

Principal, GIS Consultants
Principal of GIS Consultants, Bruce provides GIS planning and implementation management services, organizational therapy and geospatial public policy assistance, over 36 years. Bruce is Chair of the California GIS Council's UAS Policy Work Group, member of the GIS Council's Geodetic Control Work Group, Past Chair of URISA's Policy Advisory Committee, and past member and Secretary of the URISA Board of Directors.

avatar for Ahna Miller

Ahna Miller

Grad Student, Clark University
Ahna Miller is a graduate student in Geographic Information Science for Development and Environment at Clark University. She has a background in aquatic biology and is currently applying this interest by conducting spatial statistics research examining the spatial distribution of damselfish species in Papua New Guinea. Prior to graduate school, she worked in GIS for a California agriculture company and for the City of San Jose Public Works

Thursday May 12, 2016 11:20am - 11:40am
Palm West

Attendees (3)