Određivanje lektotipa Canestrinijevog glavoča, Gobius canestrinii Ninni, 1883 (Teleostei, Gobiiformes, Gobiidae, Gobionellinae)

A recent study based on molecular biological data revealed that Gobius canestrinii (Ninni, 1883), a gobioid fish endemic to the Adriatic basin, has to be split in three lineages. The original description was based on populations from two distant localities in Italy and in Croatia respectively, the first representing one of these lineages, the second most likely belonging to another lineage. To fix the name of the species, we hereby designated a lectotype for Canestrini’s Goby.Nedavna istraživanja, zasnovana na molekularno biološkim metodama, otkrila su da se Gobius canestrinii (Ninni, 1883), endemski glavoč jadranskog bazena, dijeli u tri filogenetske grane. Izvorni opis vrste zasnivao se na populacijama dva udaljena lokaliteta u Italiji i Hrvatskoj. Populacija u Italiji predstavlja jednu od tri filogenetske grane, dok druga najvjerojatnije predstavlja jednu od preostale dvije grane. Da bi se fiksiralo ime vrste, u ovom radu određujemo lektotip Canestrinijevog glavoča

Koliko je jedinki britke jedroglavke, Lophotus lacepede Giorna, 1809 (Pisces: Lophotidae), ulovljeno u Jadranu?

In this paper the status of crested oarfish Lophotus lacepede Giorna, 1809 (Pisces: Lophotidae) is checked with precise information from records of this species in the Adriatic Sea. According to presented data it was concluded that just five confirmed records were noted in the Adriatic Sea. Finally, it should be noted that the crested oarfish is very rare species in the Adriatic Sea.U ovom radu je obavljena analiza broja ulovljenih jedinki britke jedroglavke Lophotus lacepede Giorna, 1809 (Pisces: Lophotidae) uz pregled točnih i potvrdnih nalaza ove vrste u Jadranu. Suglasno dobivenim rezultatima može se zaključiti da je do sada potvrđeno samo pet nalaza ove vrste u Jadranu. Na kraju, može se na osnovi broja potvrdnih nalaza utvrditi da je ova vrsta vrlo rijetka za Jadran

Temperature-Dependent Reproductive Success of Stickleback Lateral Plate Morphs: Implications for Population Polymorphism and Range Shifts Under Ocean Warming

Changing environments associated with rapid climate change can shape direct measures of fitness such as reproductive success by altering mating behavior, fecundity and offspring development. Using a polymorphic oceanic population of threespine stickleback (Gasterosteus aculeatus), we investigated whether a 4°C increase in sea surface temperature influenced clutch siring success, reproductive output, and offspring growth among lateral plate morphs. Since low plated morphs are thought to have a selective advantage in warmer environments, we predicted that low plated males should have higher clutch siring success in +4°C environments, and that thermal plasticity of traits (e.g., egg size, offspring growth) should reflect different trait optima in different environments among plate morphs. Parentage analysis of egg clutches revealed temperature-specific clutch siring success, in that low plated males sired more clutches in +4°C environments and completely plated males sired more clutches at ambient (seasonal) temperature. Both completely and low plated females laid larger eggs when acclimated to +4°C, but only completely plated females had smaller clutches at +4°C. Offspring of low and partially plated females grew much less at +4°C compared to those of completely plated females. Taken together, our results demonstrate that ocean warming could impact reproductive success at various levels, with differential effects depending on phenotype, in this case, lateral plate morph. Some traits (clutch siring success, egg size) showed better performance for low plated fish at +4°C, whereas others (e.g., growth) did not. Higher clutch siring success of low plated males at elevated temperature might indicate a future shift in plate morph composition for polymorphic stickleback populations, with potential implications for colonization ability during range shifts under climate change

Within-generation and transgenerational plasticity of mate choice in oceanic stickleback under climate change

Plasticity, both within and across generations, can shape sexual traits involved in mate choice and reproductive success, and thus direct measures of fitness. Especially, transgenerational plasticity (TGP), where parental environment influences offspring plasticity in future environments, could compensate for otherwise negative effects of environmental change on offspring sexual traits. We conducted a mate choice experiment using stickleback (Gasterosteus aculeatus) with different thermal histories (ambient 178C or elevated 218C) within and across generations under simulated ocean warming using outdoor mesocosms. Parentage analysis of egg clutches revealed that maternal developmental temperature and reproductive (mesocosm) environment affected egg size, with females that developed at 178C laying smaller eggs in 218C mesocosms, likely owing to metabolic costs at elevated temperature. Paternal developmental temperature interacted with the reproductive environment to influence mating success, particularly under simulated ocean warming, with males that developed at 218C showing lower overallmating success compared with 178C males, but higher mating success in 218C mesocosms. Furthermore, mating success of males was influenced by the interaction between F1 developmental temperature and F0 parent acclimation temperature, demonstrating the potential role of both TGP and within-generation plasticity in shaping traits involved in sexual selection and mate choice, potentially facilitating rapid responses to environmental change. This article is part of the theme issue ‘The role of plasticity in phenotypic adaptation to rapid environmental change’

Redescription of the paedomorphic goby Schindleria nigropunctata Fricke & El-Regal 2017 (Teleostei: Gobiidae) from the Red Sea

Ahnelt, Harald (2019): Redescription of the paedomorphic goby Schindleria nigropunctata Fricke & El-Regal 2017 (Teleostei: Gobiidae) from the Red Sea. Zootaxa 4615 (3): 450-456, DOI: 10.11646/zootaxa.4615.3.

A new species of Schindleria (Teleostei: Gobiidae) from Tahiti (French Polynesia) with a unique lower jaw dentition

A new paedomorphic gobiid species, Schindleria multidentata, is described from the Pacific island of Tahiti (French Polynesia). The new species belongs to the group with a long dorsal fin (LDF). Schindleria multidentata is characterized by an elongate, slender body (body depth at pectoral-radial plate origin 4.1 % of SL and at anal-fin origin 5.6 % of SL); a long dorsal fin originating distinctly anterior to the origin of the anal fin (predorsal-fin length 57.5, preanal-fin length 74.4 % of SL); a short tail (29.8 % of SL); a short (length 3.3 % of SL) and wide (83.5 % in length of pectoral-radial plate) pectoral-radial plate; a simple last procurrent ray with a length about 25 % of that of the first and last principle caudal-fin rays respectively; 19 – 21 dorsal fin rays; 13 – 15 anal-fin rays; the first-anal fin ray below dorsal-fin ray 9 – 10; numerous tiny and densely set teeth in the upper and lower jaws (about 40 on the premaxilla and about 30 on the dentary); teeth on the dentary separated by a distinct gap (diastema) into an anterior and a posterior group; the maxilla slightly curved, thin, rod-like, distally flattened, and with a plate-like expansion; and the lower jaw forming a narrow, slightly pointed arch