Abstract
The Northern clingfish is a small, Eastern North Pacific fish that can attach to rough, fouled rocks in the intertidal. Their ability to attach to surfaces has been measured previously in the laboratory, and in this study, we show the roughness and fouling of the natural habitat of these fish. We introduce a new method for measuring surface roughness of natural substrates with time-limited accessibility. We expect this method to be broadly applicable in studies of animal/substrate surface interactions in habitats difficult to characterize. Our roughness measurements demonstrate that the fish’s ability to attach to very coarse roughness is required in its natural environment. Some of the rocks showed even coarser roughness than the fish could attach to in the lab setting. We also characterized the clingfish’s preference for other habitat descriptors such as the size of the rocks, biofilm, and Aufwuchs (macroalgae, encrusting invertebrates) cover, as well as grain size of underlying substrate. Northern clingfish seek shelter under rocks of 15–45 cm in size. These rocks have variable Aufwuchs cover, and gravel is the main underlying substrate type. In the intertidal, environmental conditions change with the tides, and for clingfish, the daily time under water (DTUW%) was a key parameter explaining distribution. Rather than location being determined by intertidal zonation, an 80% DTUW, a finer scale concept of tidal inundation, was required by the fish. We expect that this is likely because the mobility of the fish allows them to more closely track the ideal inundation in the marine intertidal.
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Acknowledgements
This work was financially supported by the University of Hawaii MARC U-STAR and Friday Harbor Labs Blinks-NSF REU-BEACON Program (DBI-1262239), NSF IOS-1256602 to APS, and a UW STEP grant to PD.
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Ditsche, P., Hicks, M., Truong, L. et al. From smooth to rough, from water to air: the intertidal habitat of Northern clingfish (Gobiesox maeandricus). Sci Nat 104, 33 (2017). https://doi.org/10.1007/s00114-017-1454-8
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DOI: https://doi.org/10.1007/s00114-017-1454-8