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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 562799
Title A treasure from the past: Modelling former sperm whale distribution with historical whaling data
Author(s) Sahri, Achmad; Iqbal Herwata Putra, Muhammad; Mustika, Putu Liza Kusuma; Murk, A.J.
Source In: Wias Annual Conference 2020. - WIAS - p. 50 - 50.
Event WIAS Annual Conference 2020, Lunteren, 2020-02-13/2020-02-14
Department(s) Marine Animal Ecology
Publication type Abstract in scientific journal or proceedings
Publication year 2020
Abstract Knowledge on the presence and habitat preference of cetaceans is important for conservation management in Indonesia. However, the records of current species occurrence covering all the country’s waters are lacking. A potential treasure trove in terms of whale presence is historical whaling data for sperm whale (data from 1761-1920, Charles HaskinsTownsend). Sperm whale is one of the most important species, and ubiquitous around equatorial Indonesia. A critical gap, however, is information about whale distribution, as historic data only depicts whaling points. First, we linked sperm whale historical whaling data to nine submerged topographic variables (bathy metry, slope, distance to- coast,-1000 m & -5000 m isobaths, seamount, shelf, trench, and trough) to determine habitat preference of sperm whale. Then, this relation was projected onto the study area. Both stepswere performed using habitat models, Maxent and Generalized Additive Model (GAM),providing whale distribution over seasons. Our results showed that Maxent predicted a wider area of distribution than GAM, and its distributions agreed best with the historical whaling data. Four areas in the eastern Indonesia were always identified as important habitats for sperm whales at any season, while in some locations at certain seasons, sperm whales did not occur. Conservation management e.g. marine protected areas and marine spatial planning in Indonesia should take into account this seasonal variability. Modern habitat models applied to historical whaling data can unveil historical sperm whale distribution and its seasonal differences. Our information can provide a baseline to assess presents perm whale distribution, prioritise current research and monitoring (future data collection),and contribute with recommendations to marine mammal conservation management in Indonesia.
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