Precautionary design of a marine protected area based on a habitat model

Gerrodette, Tim; Eguchi, Tomoharu

doi:10.3354/esr00369

Cited by 25 publications

(29 citation statements)

References 28 publications

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“…Royle et al 2004, Gerrodette & Eguchi 2011, but here they are represented as mean values (e.g. for the year or stratum encompassing the K effort segments).…”

Section: Observation Modelmentioning

confidence: 99%

Improved abundance and trend estimates for sperm whales in the eastern North Pacific from Bayesian hierarchical modeling

Moore¹,

Barlow²

2014

Endang. Species. Res.

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Population abundance and trends are informative metrics for assessing population status and basing management decisions, but it can be challenging to estimate these metrics for species that are difficult to detect. We used a Bayesian hierarchical approach to improve estimates of abundance and trends for sperm whales Physeter macrocephalus in the California Current based on 6 surveys conducted from 1991 to 2008. The method consists either of a regression trend or Markov process model for true abundance in the study area and an observation model used to estimate detection probability (in our case, based on line-transect distance sampling methods). Our approach improves upon models that we have applied to other cetacean species by incorporating direct estimates of sampling variance in the number of groups encountered (to reduce estimates of process variance) and by using an alternative to the commonly used Horvitz-Thompsonlike estimator to better deal with covariate-dependent detection probability estimation when sample sizes are small. Our abundance estimates were much less variable through time than previously published estimates; this has important implications for management under the US Marine Mammal Protection Act. We were unable to precisely estimate overall abundance trends for sperm whales in the study area, but we estimated a high probability that small-group abundance, likely representing adult male abundance, has increased.

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“…Royle et al 2004, Gerrodette & Eguchi 2011, but here they are represented as mean values (e.g. for the year or stratum encompassing the K effort segments).…”

Section: Observation Modelmentioning

confidence: 99%

Improved abundance and trend estimates for sperm whales in the eastern North Pacific from Bayesian hierarchical modeling

Moore¹,

Barlow²

2014

Endang. Species. Res.

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“…vessel traffic, naval training, fisheries interactions). Quantitative cetacean−habitat models provide a means to assess potential impacts and inform conservation management decisions (Hooker et al 1999, Cañadas et al 2002, Torres et al 2003, Kaschner et al 2006, Gerrodette & Eguchi 2011, Gilles et al 2011, Becker et al 2012a,b, Forney et al 2012, Goetz et al 2012, Keller et al 2012, Redfern et al 2013.…”

Section: Introductionmentioning

confidence: 99%

Predicting seasonal density patterns of California cetaceans based on habitat models

Becker¹,

Forney²,

Foley³

et al. 2014

Endang. Species. Res.

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“…Au & Perryman 1985, Hamazaki 2002, Doniol-Valcroze et al 2007, Praca et al 2009 as well as to model cetacean abundance as a function of predominant environmental conditions (e.g. Becker et al 2010, 2012, Gerrodette & Eguchi 2011, Forney et al 2012, even when there is no direct measurement of the potential prey. …”

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confidence: 99%

Role of environmental seasonality in the turnover of a cetacean community in the southwestern Gulf of California

Pardo¹,

Silverberg²,

Gendron³

et al. 2013

Mar. Ecol. Prog. Ser.

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La Paz Bay is a distinct region within the Gulf of California whose rich cetacean community exhibits an intense annual overturn. We studied the environmental conditions that could drive this change over the course of a year. Cetacean biomass was estimated from monthly surveys, with concurrent collection of water-column measurements of temperature, salinity, nutrients, chlorophyll a (chl a), and biogenic matter fluxes. The water-column structure showed 3 major conditions: deep mixing during winter, stratified isopycnal shoaling in spring and early summer, and deep stratification during late summer and autumn. Chl a and relative fluxes of biogenic silica and calcium carbonate indicated a seasonal succession of primary producers in response to the observed evolution of hydrography. During the periods of mixing and isopycnal shoaling, the bay provided suitable habitat for blue whales, bottlenose dolphins, and common dolphins, while fin whales, Bryde's whales, and short-finned pilot whales were numerically dominant during the period of stratification. To provide a regional context to the observed seasonality, we fitted temporal least-squares to an 11 yr monthly time series of satellite-derived wind, sea surface temperature (SST), and chlorophyll concentration (CHL). Within the bay, the SST followed the annual monsoonal shift in the wind, whereas CHL showed a bi-modal pattern, with a main peak occurring under mixing conditions in winter and a second peak under isopycnal shoaling in spring/early summer. The regional fitting suggested that the latter period was driven by a localized intraseasonal phenomenon that could be responsible for the higher biological richness of the bay compared to the surrounding gulf.KEY WORDS: Ecological succession · Seasonal variability · Nutrient supply · Stratification · Biogenic matter fluxes · Trophic levels · Marine hotspots 487: 245-260, 2013 prey for large fauna (e.g. Wingfield et al. 2011). Although these hotspots are often detectable through remote sensing of the ocean's surface, other areas that appear oligotrophic and devoid of dynamic features at the surface may also attract large feeding predators and even influence their migration patterns (e.g. Domeier et al. 2012). In such areas, the biological production maxima may be in the subsurface in the presence of a deep/sharp thermocline, underscoring the importance of measuring hydrographic and biological parameters, both at the surface and in the water column, for the characterization of biological hotspots. Resale or republication not permitted without written consent of the publisher Contribution to the Theme Section 'Biophysical coupling of marine hotspots' FREE REE ACCESS CCESSMar Ecol Prog SerThe most productive areas of the Gulf of California (hereafter 'the gulf'; Fig. 1) are located along its eastern (continental) side and in the northern region due to winter upwelling and tidal mixing, respectively (Lluch-Cota 2000). The southwestern gulf (peninsular side) is comparatively less produc tive, except for La Paz B...

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Precautionary design of a marine protected area based on a habitat model

Cited by 25 publications

References 28 publications

Improved abundance and trend estimates for sperm whales in the eastern North Pacific from Bayesian hierarchical modeling

Improved abundance and trend estimates for sperm whales in the eastern North Pacific from Bayesian hierarchical modeling

Predicting seasonal density patterns of California cetaceans based on habitat models

Role of environmental seasonality in the turnover of a cetacean community in the southwestern Gulf of California

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