Going with the flow: Tidal influence on the occurrence of the harbour porpoise (Phocoena phocoena) in the Marsdiep area, The Netherlands

IJsseldijk, Lonneke L.; Camphuysen, Kees; Nauw, Janine J.; Aarts, Geert

doi:10.1016/j.seares.2015.07.010

Cited by 24 publications

(22 citation statements)

References 37 publications

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“…However, studies are unanimous in recognizing that these are indirect measures because they primarily influence the distribution of prey, which consequently affects the spatial and behavioural patterns of predators (Hastie et al 2004). In a study by Ijsseldijk et al (2015), the authors evaluated the influence of different tidal covariates such as salinity and temperature on habitat use by Phocoena phocoena. Salinity was identified as the most important factor, but according to the authors this is an indirect measure because it is tidal patterns that cause variation in salinity (Ijsseldijk et al 2015).…”

Section: Discussionmentioning

confidence: 99%

“…In a study by Ijsseldijk et al (2015), the authors evaluated the influence of different tidal covariates such as salinity and temperature on habitat use by Phocoena phocoena. Salinity was identified as the most important factor, but according to the authors this is an indirect measure because it is tidal patterns that cause variation in salinity (Ijsseldijk et al 2015).…”

Section: Discussionmentioning

confidence: 99%

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Tidal and seasonal influences in dolphin habitat use in a southern Brazilian estuary

2017

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Summary:In this study we describe how franciscana and Guiana dolphin habitat use is influenced by tidal cycles and seasonality in Babitonga Bay. The franciscanas use a greater area in winter and a smaller area in summer, but the extent of the area used did not vary with the tide. Guiana dolphins did not change the extent of the area used within seasons or tides. Franciscanas remained closer to the mouth of the bay and the islands during ebb tide, moving to the inner bay areas and closer to the mainland coast during flood tide. Guiana dolphin used areas closer to the mainland coast during the flood tide. Guiana dolphin patterns of movement do not seem to be related to the tidal current. Franciscanas used sandier areas while Guiana dolphins preferred muddy areas, with some seasonal variation. We suggest that these dolphins modify their distributions based on habitat accessibility and prey availability. This study enhances our knowledge of critical habitat characteristics for franciscana and Guiana dolphins, and these factors should be considered when planning local human activities targeting species conservation.Keywords: tide cycles; survey method; franciscana dolphin; Guiana dolphin; critical habitat; Babitonga Bay; SW Atlantic Ocean. Influencia de las mareas y las estaciones en el uso de hábitat de delfines en un estuario del sur de BrasilResumen: En este estudio describimos como el uso del hábitat del delfín franciscana y delfín costero es influenciado por los ciclos de mareas y las estaciones en la bahía Babitonga. Las franciscanas utilizan áreas mayores en invierno y menores en verano, pero el tamaño del área utilizada no varió con las mareas. El área de uso del delfín costero no varió entre estaciones ni con las mareas. Las franciscanas permanecieron más próximas a la boca de la bahía e islas durante la marea baja, moviéndose hacia áreas más internas cercanas al margen del continente durante la marea alta. Del mismo modo, el delfín costero utilizó áreas cercanas al margen del continente durante la marea alta. Los patrones de movimiento del delfín costero no presentaron relación con las corrientes de marea. Las franciscanas utilizaron áreas con más arena mientras que los delfines costeros prefirieron áreas lodosas; esta preferencia varió estacionalmente para ambas especies. Sugerimos que estos delfines modifican su distribución en base a la accesibilidad del hábitat y la disponibilidad de presas. Este estudio aumenta nuestro conocimiento sobre las características del hábitat crítico para la franciscana y el delfín costero, y estos factores deben ser considerados en la planificación de las actividades humanas locales orientadas a la conservación de estas especies.Palabras clave: ciclos de mareas; método de barrido; delfín franciscana; delfín costero; hábitat crítico; bahía Babitonga; Océano Atlántico SO.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Tidal and seasonal influences in dolphin habitat use in a southern Brazilian estuary

2017

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“…Ephemeral yet predictable oceanographic structures (e.g. fronts, boils and eddies) may improve foraging opportunities, although other benefits, such as cost-free transport, may also contribute to their appeal (Stevick et al 2008, Embling et al 2012, IJsseldijk et al 2015. In apparent contrast, other studies (Embling et al 2010, Booth et al 2013) have indicated that harbour porpoise densities, in particular, are more strongly associated with low-flow habitats, although this may be partially linked to methodo logical differences.…”

Section: Introductionmentioning

confidence: 99%

Riding the tide: use of a moving tidal-stream habitat by harbour porpoises

Benjamins

Dale²,

Geel³

et al. 2016

Mar. Ecol. Prog. Ser.

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Tidal-stream habitats present periodically fast-flowing, turbulent conditions. Evidence suggests that these conditions benefit top predators such as harbour porpoises Phocoena phocoena, presumably allowing them to optimise exploitation of prey resources. However, clear demonstration of this relationship is complicated by the fact that strong tidal flows often occur near-simultaneously across a wide area. The Great Race of the Gulf of Corryvreckan (western Scotland, UK) is a jetting tidal system where high-energy conditions persist across a broad range of tidal phases in a localised, moving patch of water. Porpoises can therefore actively enter or avoid this habitat, facilitating study of their usage of adjacent high-and low-energy environments. The distribution of harbour porpoises was studied using passive acoustic porpoise detectors (C-PODs) deployed on static moorings (~35 d) and on Lagrangian drifters moving freely with the current (up to ~48 h). This dual approach provided complementary perspectives on porpoise presence. C-PODs moored in the path of the Great Race registered a significant increase in detections during the passing of the energetic tidal jet. Encounter durations recorded by drifting C-PODs were longer than those recorded by moored C-PODs, suggesting that porpoises tended to move downstream with the flow rather than remaining stationary relative to the seabed or moving upstream. The energetic, turbulent conditions of the Great Race are clearly attractive to porpoises, and they track its movement with time; however, their structured movements in response to the evolving tidal situation cannot simply be represented as a direct relationship between current speed and porpoise presence.

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“…Bailey & Thompson 2009, Booth et al 2013, Hammond et al 2013) have been collected using either plane-or boat-based visual surveys or towed acoustic arrays. While repeated visual and towed acoustic surveys in restricted areas can explore the effects of seasonal and tidal cycles (Goodwin 2008, Philpott 2013, IJsseldijk et al 2015, this is rarely possible for surveys carried out over larger areas due to their restricted temporal coverage.…”

Section: Introductionmentioning

confidence: 99%

Diurnal variation in harbour porpoise detection—potential implications for management

Williamson¹,

Brookes²,

Scott³

et al. 2017

Mar. Ecol. Prog. Ser.

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Robust information on animal distributions and foraging behaviour is required to target management and conservation measures for protected species and populations. Visual survey data are commonly used to model these distributions. However, because visual data can only be collected in daylight, modelled distributions and consequent management actions may fail to identify or protect important nocturnal habitats. We explored this issue using data from the Moray Firth, Scotland, where visual survey data have previously been used to characterise habitat use and distribution patterns of harbour porpoises Phocoena phocoena. Marine predators such as harbour porpoises have a widespread distribution, are highly mobile and are known to exhibit behavioural variation in relation to diel cycles. Here, we used long-term passive acoustic data which revealed habitat-specific differences in diel patterns of detection. Harbour porpoises were detected consistently during night and day in sandy areas, with peaks in detection around sunrise and sunset, and at night in muddy areas. Detections also varied with depth, with the greatest proportion of daytime detections recorded in shallower sandy areas, and the most nighttime detections recorded in deeper muddy areas. The proportion of detections with foraging buzzes increased slightly during the night and in muddy habitats. These findings suggest that the importance of muddy habitats could be underestimated when using visual survey data alone. This highlights the value of using a combination of visual and acoustic methods both to characterise species distribution and to support efforts to develop appropriate spatio-temporal management of key habitats.

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Going with the flow: Tidal influence on the occurrence of the harbour porpoise (Phocoena phocoena) in the Marsdiep area, The Netherlands

Cited by 24 publications

References 37 publications

Tidal and seasonal influences in dolphin habitat use in a southern Brazilian estuary

Tidal and seasonal influences in dolphin habitat use in a southern Brazilian estuary

Riding the tide: use of a moving tidal-stream habitat by harbour porpoises

Diurnal variation in harbour porpoise detection—potential implications for management

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