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Open research questions in Marine animal studies overview

42 unresolved questions extracted from the limitations and future-work sections of 473 Marine animal studies overview papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • There were a few limitations in this study. It would have been preferrable to employ a totally non-reflective control rather than a semi-reflective control. We opted to use the latter as it afforded the opportunity to videotape and compare the intri- cacies of the whales’ behavioral responses to the mirror.

    Evidence for mirror self-recognition in beluga whales (Delphinapterus leucas) · 2026 · DOI

  • There were four sites where UAV counts differed by more than the 5% threshold for count repeatability (Fig. 3, Appen- dix 1). It would therefore be beneficial to develop guidelines for UAV survey protocol, image quality and image inter- pretation to further standardise interpretation and achieve repeatability across all surveys, as are available for tradi- tional on-ground survey methods (CCAMLR 2014). Such guidelines would help prevent further miscounts as occurred during UAV surveys at Port Lockroy (Flynn et al. 2026). For example, minimising the effects of observer bias by speci- fying that all counts from UAV imagery used in research, or counts being submitted to publicly available databases such as MAPPPD (Oceanites 2023), should ensure that two trained observers reach agreement within 5% before counts are accepted. This is particularly important if counts are used to inform management recommendations. Our research also documented a shift in the timing of breeding at Port Lockroy (Fig. 4), and negative effects of this trend on the gentoo population (Fig. 4). This result con- trasts with previous work (Lynch et al. 2012a; Juarez Mar- tinez et al. 2026), suggesting changes to breeding phenology are likely to be site specific. Renewed investigations into changes to breeding phenology across the Antarctic Pen- insula would be beneficial, particularly on the impacts of changing environmental conditions such as late snowfall. Regardless, accounting for breeding phenology is essential when investigating long-term population trends, as phenol- ogy is tied to environmental conditions which may help explain inter-annual delays or declines (Hinke et al. 2012; Juáres et al. 2013). Recording the stage in the breeding cycle, such as an estimate of the percentage of nests with eggs or chicks, would therefore provide useful context alongside the date of the survey during opportunistic surveys.

    A comparison of uncrewed aerial vehicle and on-ground surveys of penguin populations on the Antarctic Peninsula · 2026 · DOI

  • Consistent long-term acoustic monitoring protocols specifically calibrated for South Texas bottlenose dolphins have not been established, limiting comparative assessments with similar fishing- and structure-associated habitats worldwide. Future research must develop standardized acoustic monitoring methods for similar trawling environments and coastal structures to enable broader geographic comparisons.

    Common bottlenose dolphin (Tursiops truncatus) whistles and clicks across foraging contexts · 2026 · DOI

  • Habitat features including depth, physical structure, and ambient noise should be directly measured and distinguished to separate the relative contributions of masking avoidance from social coordination in shaping bottlenose dolphin acoustic behavior across fishing-associated and structure-associated habitats. Current interpretations rely on comparative analysis of click centroid frequencies and whistle frequency ranges without direct habitat characterization.

    Common bottlenose dolphin (Tursiops truncatus) whistles and clicks across foraging contexts · 2026 · DOI

  • Photo-identified dolphins were not observed across both foraging contexts (trawler and seawall), preventing assessment of individual acoustic plasticity and preference for divergent foraging tactics. A detailed acoustic baseline for bottlenose dolphins in the Corpus Christi Ship Channel is required to establish whether signal pattern differences between trawler and seawall observations reflect individual preferences, habitat-driven modulation, or both.

    Common bottlenose dolphin (Tursiops truncatus) whistles and clicks across foraging contexts · 2026 · DOI

  • Ambient noise levels were not quantified during trawler and seawall foraging recordings, leaving noise-based explanations for observed spectral adjustments in bottlenose dolphin whistles and clicks inferential rather than causal. Future studies must directly measure ambient noise levels during both trawler foraging (continuous low-frequency engine noise and propeller cavitation) and seawall foraging (intermittent boat noise and reverberations) to validate whether acoustic modulation patterns result from masking avoidance versus social coordination.

    Common bottlenose dolphin (Tursiops truncatus) whistles and clicks across foraging contexts · 2026 · DOI

  • In the Baltic Sea, the number of harbour porpoises ( Phocoena phocoena ) has collapsed since the mid‐20th century and the Baltic Proper harbour porpoise is listed as Critically Endangered by the IUCN and HELCOM; however, its abundance remains unknown.

    Estimating the abundance of the critically endangered Baltic Proper harbour porpoise (<i>Phocoena phocoena</i>) population using passive acoustic monitoring · 2022 · DOI

  • Video observations showed that seals encountered the rarely reported ragfish ( Icosteus aenigmaticus ) in the depths of the OMZ , which failed to show an escape response from the seals, suggesting that low oxygen concentrations might reduce prey mobility.

    Oxygen minimum zone: An important oceanographic habitat for deep‐diving northern elephant seals,<i>Mirounga angustirostris</i> · 2017 · DOI

  • Taken together, our data suggest that gene flow is insufficient to homogenize the GB and MC populations and support the designation of GB and MC as separate polar bear conservation units.

    Extensive sampling of polar bears (<i><scp>U</scp>rsus maritimus</i>) in the <scp>N</scp>orthwest <scp>P</scp>assage (<scp>C</scp>anadian <scp>A</scp>rctic <scp>A</scp>rchipelago) reveals population differentiation across multiple spatial and temporal scales · 2013 · DOI

  • The proposed increase in growth rates of suspension feeders due to expanded phytoplankton blooms and rising oceanic temperature has been suggested by archived sample analysis but lacks direct empirical validation. Field experiments measuring benthos growth rates in newly ice-free areas and under varied temperature regimes are required.

    Antarctic marine biology · 2011 · DOI

  • Current evidence for differential survival across age spectra in well-monitored Antarctic marine species (particularly seabirds) in response to climate change is limited. Targeted demographic monitoring incorporating age-structured survival analysis is needed on penguin populations showing range shifts.

    Antarctic marine biology · 2011 · DOI

  • Organisms are proposed as high-resolution recorders of past pH and temperature in the Southern Ocean, yet the validation of these biological proxies against instrumental oceanographic records remains incomplete. Calibration studies comparing calcifying organism chemistry to measured pH and temperature profiles across Antarctic regions are needed.

    Antarctic marine biology · 2011 · DOI

  • The use of biological distributions to refine models of past ice sheet behavior requires integration of historical archived samples with genetic and biogeographic data from the Weddell and Ross seas. Current temporal resolution of species connectivity signals needs improvement to precisely constrain the timing and extent of seaways connecting these regions.

    Antarctic marine biology · 2011 · DOI

  • Detecting range shifts in sensitive Antarctic marine species requires long-term baseline data near research stations in shallow waters of the Bellingshausen and Scotia shelves. Current datasets are insufficient to establish pre-change distributions for comparison with future distributional changes in species with slow growth rates.

    Antarctic marine biology · 2011 · DOI

  • Whilst speculation exists about invasions of the Antarctic continental shelf by non-indigenous species and anomuran crabs from deeper water, hard evidence of actual biological change with clear causal links to climate change is lacking. Systematic monitoring protocols for non-indigenous species arrival and establishment on the Bellingshausen and Scotia shelves must be developed and implemented.

    Antarctic marine biology · 2011 · DOI

  • The causal link between climate change and the reported decrease in krill biomass concurrent with increased salps remains speculative. Targeted studies are needed to establish the mechanistic pathways connecting oceanographic changes west of the Antarctic Peninsula to krill population dynamics and salp bloom formation.

    Antarctic marine biology · 2011 · DOI

  • In situ study of altered community interactions in Antarctic marine ecosystems is greatly complicated by iceberg activity, slow growth rates, and taxonomic resolution limitations. Future research must develop methods to isolate the effects of community interaction changes from physical disturbance in Antarctic benthic and pelagic communities.

    Antarctic marine biology · 2011 · DOI

  • In spite of how little is known about the distribution of fin whales, one line of evidence clearly points out that their migratory behavior is much at variance with that of other migratory marine mammals, namely, that conception is at a mini- mum when fin whales are known to be c o n ~ e n t r a t e d , ~ ~ and at a maximum when they are thinly dispersed over millions of square miles of ocean (FIGURE 10).

    ORIENTATION BY MEANS OF LONG RANGE ACOUSTIC SIGNALING IN BALEEN WHALES* · 1971 · DOI

  • Krill is fished commercially in this region and is a major prey item for many predators, but little is known of the temporal-spatial variation in its distribution, biomass and behaviour.

    Antarctic krill Euphausia superba swarm structure and biomass distribution around the South Orkney Islands, Southern Ocean · 2026 · DOI

  • Abstract Social structure plays a key role in shaping ecological and evolutionary dynamics in group-living animals, yet its influence on genetic connectivity and foraging ecology remains understudied in wide-ranging marine predators.

    Patterns of foraging ecology in a highly mobile, socially complex marine predator · 2026 · DOI

  • Although the underlying causes remain poorly understood, several interacting factors are potentially affecting chinstrap pen- guin population dynamics, include the combined effects of climate change on chick survival (Salmerón et al.

    Drone survey reveals a severe chinstrap penguin decline and a novel gentoo colony in an Antarctic specially protected area · 2026 · DOI

  • ABSTRACT This study investigated the occurrence and whistle characteristics of small odontocetes in Wakasa Bay and Aso Bay, located in the coastal waters of the Sea of Japan, where ecological data are limited.

    Occurrence and Whistle Characteristics of Small Odontocetes in Two Coastal Regions of the Sea of Japan · 2026 · DOI

  • The acoustic behavior of blue whales is relatively well studied, though much of what is known is limited to the characteristically loud, low frequency songs that are believed to be produced as a reproductive display by male animals.

    From simple to sophisticated: characterization of new signals in the expanding vocal repertoire of the East Indian Ocean pygmy blue whale · 2026 · DOI

  • While these results point to the Faro area as a transit zone or a seasonal feeding ground, certain elements remain unclear and merit further attention.

    Opportunistic data for assessing abundance and site fidelity of fin whales (Balaenoptera physalus) in the Faro area, Portugal · 2026 · DOI

  • After the near-complete cessation of commercial whaling, ship collisions have emerged as a primary threat to large whales, but knowledge of collision risk is lacking across most of the world's oceans.

    Ship collision risk threatens whales across the world’s oceans · 2024 · DOI

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42 open questions have been extracted from the limitations and future-work passages of 473 Marine animal studies overview papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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