[MARMAM] New paper: Habitat use of the common bottlenose dolphin (Tursiops truncatus)

Fernando Félix Grijalva fefelix90 at hotmail.com
Tue Apr 19 12:58:52 PDT 2022

My co-author and I are pleased to inform you about this recently published article. Habitat use of the common bottlenose dolphin (Tursiops truncatus) in the Gulf of Guayaquil, Ecuador: management needs for a threatened population. Ocean and Costal Management, 223: 106174. https://doi.org/10.1016/j.ocecoaman.2022.106174.
The habitat use by two neighboring coastal bottlenose dolphin communities (Posorja and El Morro) was eval[1]uated in the western inner estuary of the Gulf of Guayaquil, Ecuador (3◦S, 80◦55′ W). The study aimed to determine to what extent some environmental variables influence dolphins’ distribution and behavior. The analysis included 344 dolphin groups recorded between 2014 and 2019. For both dolphin communities, 95% of home ranges were estimated (23.5 km2 Posorja and 44.8 km2 , El Morro). Home ranges overlapped in an area of 11.2 km2 . No clear preference for areas to carry out specific activities was found, as dolphins used the same areas for multiple purposes. Multinomial logistic regression with four environmental parameters (distance to shore, depth, hour of day and tide) were used as predictor variables of behavior. A significant relationship between the tidal cycle and behavioral states was found with feeding occurring more frequently during the low tide, so[1]cializing and transit during high tide, and resting during mid-tide. Count models were used with environmental and behavioral variables to explore their relationship with dolphins’ group size. Differences with respect to dolphin counts were associated with tide height and socialization. Depth is relevant for predicting dolphin counts mainly during high tide. We recommend that environmental authorities consider the dolphins’ preference to carry out their activities within small home ranges, identify overlapping human activities and take steps to reduce potential conflicts, such as prohibiting all types of gillnets in areas of high concentration of dolphins. Likewise, regular assessments are required to detect future changes in both dolphins’ habitat and human uses over time.
The article is available from the editorial site. I will also be happy to send it by email on request.

Fernando Félix
fefelix90 at hotmail.com

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