MARE - Marine and Environmental Sciences Centre

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Publications

Continuous but not intermittent noise has a negative impact on mating success in a marine fish with paternal care

Publication . Blom, Eva-Lotta; Kvarnemo, Charlotta; Dekhla, Isabelle; Schöld, Sofie; Andersson, Mathias H.; Svensson, Ola; Amorim, Maria Clara Pessoa

Anthropogenic underwater noise is a global pollutant of increasing concern but its impact on reproduction in fish is largely unknown. Hence, a better understanding of its consequences for this important link to fitness is crucial. Working in aquaria, we experimentally tested the impact of broadband noise exposure (added either continuously or intermittently), compared to a control, on the behaviour and reproductive success of the common goby (Pomatoschistus microps), a vocal fish with exclusive paternal care. Compared to the intermittent noise and control treatments, the continuous noise treatment increased latency to female nest inspection and spawning and decreased spawning probability. In contrast, many other female and male pre-spawning behaviours, and female ventilation rate (proxies for stress levels) did not differ among treatments. Therefore, it is likely that female spawning decisions were delayed by a reduced ability to assess male acoustic signals, rather than due to stress per se and that the silent periods in the intermittent noise treatment provided a respite where the females could assess the males. Taken together, we show that noise (of similar frequency range as anthropogenic boat noise) negatively affects reproductive success, particularly under a continuous noise exposure.

2019Journal article

Open access

Effect of breeding performance on the distribution and activity budgets of a predominantly resident population of black‐browed albatrosses

Publication . Ponchon, Aurore; Cornulier, Thomas; Hedd, April; Granadeiro, José Pedro; Catry, Paulo

Pelagic seabirds breeding at high latitudes generally split their annual cycle between reproduction, migration, and wintering. During the breeding season, they are constrained in their foraging range due to reproduction while during winter months, and they often undertake long-distance migrations. Black-browed albatrosses (Thalassarche melanophris) nesting in the Falkland archipelago remain within 700 km from their breeding colonies all year-round and can therefore be considered as resident. Accordingly, at-sea activity patterns are expected to be adjusted to the absence of migration. Likewise, breeding performance is expected to affect foraging, flying, and floating activities, as failed individuals are relieved from reproduction earlier than successful ones. Using geolocators coupled with a saltwater immersion sensor, we detailed the spatial distribution and temporal dynamics of at-sea activity budgets of successful and failed breeding black-browed albatrosses nesting in New Island, Falklands archipelago, over the breeding and subsequent nonbreeding season. The 90% monthly kernel distribution of failed and successful breeders suggested no spatial segregation. Both groups followed the same dynamics of foraging effort both during daylight and darkness all year, except during chick-rearing, when successful breeders foraged more intensively. Failed and successful breeders started decreasing flying activities during daylight at the same time, 2-3 weeks after hatching period, but failed breeders reached their maximum floating activity during late chick-rearing, 2 months before successful breeders. Moon cycle had a significant effect on activity budgets during darkness, with individuals generally more active during full moon. Our results highlight that successful breeders buffer potential reproductive costs during the nonbreeding season, and this provides a better understanding of how individuals adjust their spatial distribution and activity budgets according to their breeding performance in absence of migration.

2019Journal article

Open access

Assessment of fighting ability in the vocal cichlid Metriaclima zebra in face of incongruent audiovisual information

Publication . Amorim, Maria Clara Pessoa; Fonseca, Paulo; Mathevon, Nicolas; Beauchaud, Marilyn

Information transfer between individuals typically depends on multiple sensory channels. Yet, how multi-sensory inputs shape adaptive behavioural decisions remains largely unexplored. We tested the relative importance of audio and visual sensory modalities in opponent size assessment in the vocal cichlid fish, Metriaclima zebra, by playing back mismatched agonistic sounds mimicking larger or smaller opponents during fights of size-matched males. Trials consisted in three 5-min periods: PRE (visual), PBK (acoustic+visual) and POST (visual). During PBK agonistic sounds of smaller (high frequency or low amplitude) or larger (low frequency or high amplitude) males were played back interactively. As a control, we used white noise and silence. We show that sound frequency but not amplitude affects aggression, indicating that spectral cues reliably signal fighting ability. In addition, males reacted to the contrasting audio-visual information by giving prevalence to the sensory channel signalling a larger opponent. Our results suggest that fish can compare the relevance of information provided by different sensory inputs to make behavioural decisions during fights, which ultimately contributes to their individual fitness. These findings have implications for our understanding of the role of multi-sensory inputs in shaping behavioural output during conflicts in vertebrates.

2019Journal article

Open access

Fisher's perceptions about a marine protected area over time

Publication . Pita, Cristina Brice; Costa, Barbara Horta e; Franco, Gustavo; Coelho, Rui; Sousa, Inês; Gonçalves, Emanuel João; Gonçalves, Jorge M. S.; Erzini, Karim

The perceptions of fishers towards the Arrábida Marine Park, a marine protected area (MPA) in the west coast of Portugal, were studied through face-to-face interviews in two different moments of the MPA life cycle. Fishers' perceptions about the MPA and the impact it had on the fishing activity over time were identified just before the full implementation of the zoning and regulations of the management plan and 10 years later. This study aimed to investigate fishers' knowledge, acceptance and perceptions about the MPA changed with time, if support for the MPA was linked to the impact of the MPA on the fishing activity, and if fishers' perceptions about the impact of the MPA on the fishing activity match with local landings trends. Results show that although knowledge about the marine park significantly improved over time, fishers' acceptance did not. A decrease on fishers' support was not substantial but occurred. Issues such as the disagreement with regulations reinforced concerns raised during the implementation of the marine park, particularly in relation to the top-down decision-making, which commonly confers minor participation, recognition and legitimacy to fishers. Apparently, fisheries benefits were still not perceived by local fishers, though they are central for fishers' support. Further, the perceived negative impacts of the park seemed to be more related to social aspects and individual interests than to impacts on catches. Addressing adequate management, enforcement and participation of local fishers is still possible and are advocated here as to contribute to the expected socioecological outcomes and respective support, leading to the future successful performance of the Arrábida Marine Park. Assessing fishers’ perceptions towards an MPA over time is central and should be included on periodical socioecological monitoring and inform an effective adaptive management

2020Journal article

Open access

New Indomalayan Nebularmis species (Heterotardigrada: Echiniscidae) provoke a discussion on its intrageneric diversity

Publication . Gąsiorek, Piotr; Vončina, Katarzyna; Ciosek, Joanna; Veloso, Mariana; Fontoura, Paulo; Michalczyk, Łukasz

Recent years have brought undeniable progress in tardigrade taxonomy, and speciose complexes were detected in a number of phylogenetic lineages. The family Echiniscidae is one such lineage; it is one of the most diverse groups of limno-terrestrial tardigrades and can be characterized as having achieved great evolutionary success. In this contribution, using populations representing several species that originated from the Indomalayan region, we reconstructed phylogenetic affinities within Nebularmis, a recently erected genus within the Echiniscus lineage. Nebularmis auratus sp. nov. and Nebularmis burmensis sp. nov. are described from the Eastern Yoma Mountains and the Shan Hills (Myanmar), Nebularmis bhutanensis sp. nov. is described from the Eastern Himalayas (Bhutan), and Nebularmis indicus sp. nov. is described from the foothills of the Western Ghats (Goa, India). Moreover, males are reported in populations of the last two species. All known members of the genus can be phenotypically differentiated based on minute details of their dorsal sculpture and claws. Moreover, a very wide tropical distribution is demonstrated for Nebularmis cirinoi, recorded for the first time from islands of the Malay Archipelago. Furthemore, novel morphological, genetic, and geographic data allowed for the clarification of the generic diagnosis. Currently available data favor a scenario under which Nebularmis evolved in Southeast Asia and later dispersed to other regions of the globe.

2021Journal article

Open access